#include <BaseParticlePropagator.h>

Inheritance diagram for BaseParticlePropagator:

Public Member Functions
bool	backPropagate ()

	BaseParticlePropagator ()
	Default c'tor. More...

	BaseParticlePropagator (const RawParticle &myPart, double r, double z, double B)

	BaseParticlePropagator (const RawParticle &myPart, double r, double z, double B, double t)

double	getMagneticField () const
	Get the magnetic field. More...

int	getSuccess () const
	Has propagation been performed and was barrel or endcap reached ? More...

bool	hasDecayed () const
	Has the particle decayed while propagated ? More...

double	helixCentreDistToAxis () const
	The distance between the cylinder and the helix axes. More...

double	helixCentreDistToAxis (double xC, double yC) const

double	helixCentrePhi () const
	The azimuth if the vector joining the cylinder and the helix axes. More...

double	helixCentrePhi (double xC, double yC) const

double	helixCentreX () const
	The x coordinate of the helix axis. More...

double	helixCentreX (double radius, double phi) const

double	helixCentreY () const
	The y coordinate of the helix axis. More...

double	helixCentreY (double radius, double phi) const

double	helixRadius () const
	The helix Radius. More...

double	helixRadius (double pT) const

double	helixStartPhi () const
	The azimuth of the momentum at the vertex. More...

void	increaseRCyl (double delta)
	Just an internal trick. More...

void	init ()
	Initialize internal switches and quantities. More...

bool	inside () const
	Is the vertex inside the cylinder ? (stricly inside : true) More...

bool	inside (double rPos2) const

bool	onBarrel () const
	Is the vertex already on the cylinder barrel ? More...

bool	onBarrel (double rPos2) const

bool	onEndcap () const
	Is the vertex already on the cylinder endcap ? More...

bool	onEndcap (double rPos2) const

bool	onFiducial () const
	Is the vertex on some material ? More...

bool	onSurface () const
	Is the vertex already on the cylinder surface ? More...

bool	onSurface (double rPos2) const

bool	propagate ()

BaseParticlePropagator	propagated () const

bool	propagateToBeamCylinder (const XYZTLorentzVector &v, double radius=0.)

bool	propagateToClosestApproach (double x0=0., double y0=0, bool first=true)

bool	propagateToEcal (bool first=true)

bool	propagateToEcalEntrance (bool first=true)

bool	propagateToHcalEntrance (bool first=true)

bool	propagateToHcalExit (bool first=true)

bool	propagateToHOLayer (bool first=true)

bool	propagateToNominalVertex (const XYZTLorentzVector &hit2=XYZTLorentzVector(0., 0., 0., 0.))

bool	propagateToPreshowerLayer1 (bool first=true)

bool	propagateToPreshowerLayer2 (bool first=true)

bool	propagateToVFcalEntrance (bool first=true)

void	resetDebug ()

void	setDebug ()
	Set the debug leve;. More...

void	setMagneticField (double b)
	Set the magnetic field. More...

void	setPropagationConditions (double r, double z, bool firstLoop=true)
	Set the propagation characteristics (rCyl, zCyl and first loop only) More...

void	setProperDecayTime (double t)
	Set the proper decay time. More...

double	xyImpactParameter (double x0=0., double y0=0.) const
	Transverse impact parameter. More...

double	zImpactParameter (double x0=0, double y0=0.) const
	Longitudinal impact parameter. More...

Public Member Functions inherited from RawParticle
void	boost (double bx, double by, double bz)

void	boost (const Boost &b)

double	charge () const
	get the MEASURED charge More...

void	chargeConjugate ()

double	cos2Theta () const
	Cos**2(theta) is faster to determine than eta. More...

double	cos2ThetaV () const

double	et () const
	get the transverse energy More...

double	eta () const

int	isUsed () const

double	mass () const
	get the MEASURED mass More...

const XYZTLorentzVector &	momentum () const
	the momentum fourvector More...

RawParticle &	operator= (const RawParticle &rhs)

double	PDGcharge () const
	get the THEORETICAL charge More...

double	PDGcTau () const
	get the THEORETICAL lifetime More...

double	PDGmass () const
	get the THEORETICAL mass More...

std::string	PDGname () const
	get the PDG name More...

int	pid () const
	get the HEP particle ID number More...

void	print () const

void	printName () const

double	r () const
	vertex radius More...

double	R () const
	vertex radius More...

double	r2 () const
	vertex radius**2 More...

double	R2 () const
	vertex radius**2 More...

	RawParticle ()

	RawParticle (const XYZTLorentzVector &p)

	RawParticle (const int id, const XYZTLorentzVector &p)

	RawParticle (const std::string name, const XYZTLorentzVector &p)

	RawParticle (const XYZTLorentzVector &p, const XYZTLorentzVector &xStart)

	RawParticle (double px, double py, double pz, double e)

	RawParticle (const RawParticle &p)

void	reUse ()

void	rotate (double rphi, const XYZVector &raxis)

void	rotate (const Rotation &r)

void	rotate (const Rotation3D &r)

void	rotate (const RotationX &r)

void	rotate (const RotationY &r)

void	rotate (const RotationZ &r)

void	rotateX (double rphi)

void	rotateY (double rphi)

void	rotateZ (double rphi)

void	setCharge (float q)
	set the MEASURED charge More...

void	setID (const int id)

void	setID (const std::string name)

void	setMass (float m)
	set the RECONSTRUCTED mass More...

void	setStatus (int istat)

void	setT (const double t)
	set the time of creation More...

void	setVertex (const XYZTLorentzVector &vtx)
	set the vertex More...

void	setVertex (double xv, double yv, double zv, double tv)

int	status () const
	get the particle status More...

double	t () const
	vertex time More...

double	T () const
	vertex time More...

void	translate (const XYZVector &t)

void	use ()

const XYZTLorentzVector &	vertex () const
	the vertex fourvector More...

double	x () const
	x of vertex More...

double	X () const
	x of vertex More...

double	y () const
	y of vertex More...

double	Y () const
	y of vertex More...

double	z () const
	z of vertex More...

double	Z () const
	z of vertex More...

virtual	~RawParticle ()

Protected Member Functions
double	c_light () const
	The speed of light in mm/ns (!) without clhep (yeaaahhh!) More...

Protected Attributes
bool	fiducial
	The particle traverses some real material. More...

int	success
	0:propagation still be done, 1:reached 'barrel', 2:reached 'endcaps' More...

Protected Attributes inherited from RawParticle
double	myCharge
	the MEASURED charge More...

int	myId
	the particle id number HEP-PID More...

const ParticleData *	myInfo
	The pointer to the PDG info. More...

double	myMass
	the RECONSTRUCTED mass More...

int	myStatus
	the status code according to PYTHIA More...

int	myUsed
	status of the locking More...

XYZTLorentzVector	myVertex
	the four vector of the vertex More...

Private Attributes
double	bField
	Magnetic field in the cylinder, oriented along the Z axis. More...

bool	debug
	The debug level. More...

bool	decayed
	The particle decayed while propagated ! More...

bool	firstLoop
	Do only the first half-loop. More...

int	propDir
	The propagation direction. More...

double	properDecayTime
	The proper decay time of the particle. More...

double	properTime
	The proper time of the particle. More...

double	rCyl
	Simulated particle that is to be resp has been propagated. More...

double	rCyl2

double	zCyl
	Half-height of the cylinder (centred at 0,0,0) to which propagation is done. More...

Additional Inherited Members
Public Types inherited from RawParticle
typedef ROOT::Math::Boost	Boost

typedef ROOT::Math::AxisAngle	Rotation

typedef ROOT::Math::Rotation3D	Rotation3D

typedef ROOT::Math::RotationX	RotationX

typedef ROOT::Math::RotationY	RotationY

typedef ROOT::Math::RotationZ	RotationZ

Detailed Description

This class is aimed at propagating charged and neutral particles (yet under the form of a RawParticle) from a given vertex to a cylinder, defined by a radius rCyl and a length 2*zCyl, centered in (0,0,0) and whose axis is parallel to the B field (B is oriented along z, by definition of the z axis).

The main method

bool propagate()

returns true if an intersection between the propagated RawParticle and the cylinder is found. The location of the intersection is given by the value of success:

success = 2 : an intersection is found forward in the cylinder endcaps. The RawParticle vertex and momentum are overwritten by the values at this intersection.
success = 1 : an intersection is found forward in the cylinder barrel. The RawParticle vertex and momentum are overwritten by the values at this intersection.
success =-2 : an intersection is found backward in the cylinder endcaps. The RawParticle vertex and momentum are NOT overwritten by the values at this intersection.
success =-1 : an intersection is found backward in the cylinder barrel. The RawParticle vertex and momentum are NOT overwritten by the values at this intersection.
success = 0 : No intersection is found after half a loop (only possible if firstLoop=true). The vertex and momentum are overwritten by the values after this half loop.

The method

propagated()

returns a new RawParticle with the propagated coordinates, if overwriting is not considered an advantage by the user.

Particles can be propagated backward with the method

backPropagate()

Member functions

o propagateToPreshowerLayer1(), o propagateToPreshowerLayer2(), o propagateToEcalEntrance(), o propagateToHcalEntrance(), o propagateToHcalExit(), o propagateToClosestApproach(),

only need a momentum, a vertex and an electric charge to operate. Radii, half-lengths and default B field (4T) are set therein by default.

As of today, no average loss of energy (dE/dx, Brems) is considered in the propagation. No uncertainty (multiple scattering, dE/dx, Brems) is yet implemented.

Author: Patrick Janot $Date : 19-Aug-2002, with subsequent modification for FAMOS

Version: 15-Dec-2003

Definition at line 82 of file BaseParticlePropagator.h.

Constructor & Destructor Documentation

BaseParticlePropagator::BaseParticlePropagator ( )

Default c'tor.

Definition at line 4 of file BaseParticlePropagator.cc.

Referenced by ParticlePropagator::ParticlePropagator().

                                                :
   RawParticle(), rCyl(0.), rCyl2(0.), zCyl(0.), bField(0), properDecayTime(1E99)
 {;}

BaseParticlePropagator::BaseParticlePropagator	(	const RawParticle &	myPart,
		double	r,
		double	z,
		double	B
	)

Constructors taking as arguments a RawParticle, as well as the radius, half-height and magnetic field defining the cylinder for which propagation is to be performed, and optionally, the proper decay time

Definition at line 15 of file BaseParticlePropagator.cc.

References init().

                                                                  :
   RawParticle(myPart), rCyl(R), rCyl2(R*R), zCyl(Z), bField(B), properDecayTime(1E99) 
 {
   init();
 }

BaseParticlePropagator::BaseParticlePropagator	(	const RawParticle &	myPart,
		double	r,
		double	z,
		double	B,
		double	t
	)

Definition at line 8 of file BaseParticlePropagator.cc.

References init().

                                                                             :
   RawParticle(myPart), rCyl(R), rCyl2(R*R), zCyl(Z), bField(B), properDecayTime(t) 
 {
   init();
 }

Member Function Documentation

bool BaseParticlePropagator::backPropagate ( )

Update the current instance, after the back-propagation of the particle to the surface of the cylinder

Definition at line 320 of file BaseParticlePropagator.cc.

References RawParticle::charge(), propagate(), propDir, and RawParticle::setCharge().

Referenced by propagated(), and propagateToClosestApproach().

                                       {
 
   // Backpropagate
   SetXYZT(-Px(),-Py(),-Pz(),E());
   setCharge(-charge());
   propDir = -1;
   bool done = propagate();
   SetXYZT(-Px(),-Py(),-Pz(),E());
   setCharge(-charge());
   propDir = +1;
 
   return done;
 }

double BaseParticlePropagator::c_light ( ) const

inlineprotected

The speed of light in mm/ns (!) without clhep (yeaaahhh!)

Definition at line 153 of file BaseParticlePropagator.h.

Referenced by helixRadius(), and propagateToBeamCylinder().

153 { return 299.792458; }

double BaseParticlePropagator::getMagneticField ( ) const

inline

Get the magnetic field.

Definition at line 303 of file BaseParticlePropagator.h.

References bField.

Referenced by TrajectoryManager::createPSimHits(), and ConvBremSeedProducer::produce().

303 { return bField; }

BaseParticlePropagator::bField

double bField

Magnetic field in the cylinder, oriented along the Z axis.

Definition: BaseParticlePropagator.h:140

int BaseParticlePropagator::getSuccess ( ) const

inline

Has propagation been performed and was barrel or endcap reached ?

Definition at line 297 of file BaseParticlePropagator.h.

References success.

Referenced by PFTrackTransformer::addPoints(), PFTrackTransformer::addPointsAndBrems(), AntiElectronIDMVA6::atECalEntrance(), FBaseSimEvent::fill(), ConvBremSeedProducer::GoodCluster(), ConvBremSeedProducer::produce(), TrajectoryManager::propagateToCalorimeters(), and TrajectoryManager::propagateToLayer().

297 { return success; }

BaseParticlePropagator::success

int success

0:propagation still be done, 1:reached 'barrel', 2:reached 'endcaps'

Definition: BaseParticlePropagator.h:148

bool BaseParticlePropagator::hasDecayed ( ) const

inline

Has the particle decayed while propagated ?

Definition at line 294 of file BaseParticlePropagator.h.

References decayed.

Referenced by ParticlePropagator::propagateToBoundSurface(), and TrajectoryManager::propagateToCalorimeters().

294 { return decayed; }

BaseParticlePropagator::decayed

bool decayed

The particle decayed while propagated !

Definition: BaseParticlePropagator.h:159

double BaseParticlePropagator::helixCentreDistToAxis ( ) const

inline

The distance between the cylinder and the helix axes.

Definition at line 229 of file BaseParticlePropagator.h.

References helixCentreX(), helixCentreY(), and mathSSE::sqrt().

Referenced by propagate(), propagateToBeamCylinder(), propagateToClosestApproach(), and xyImpactParameter().

                                               { 
     // The distance between the cylinder and the helix axes
     double xC = helixCentreX();
     double yC = helixCentreY();
     return std::sqrt( xC*xC + yC*yC );
   }

double BaseParticlePropagator::helixCentreDistToAxis	(	double	xC,
		double	yC
	)		const

inline

Definition at line 236 of file BaseParticlePropagator.h.

References mathSSE::sqrt().

                                                                   { 
     // Faster version of helixCentreDistToAxis
     return std::sqrt( xC*xC + yC*yC );
   }

double BaseParticlePropagator::helixCentrePhi ( ) const

inline

The azimuth if the vector joining the cylinder and the helix axes.

Definition at line 242 of file BaseParticlePropagator.h.

References helixCentreX(), and helixCentreY().

Referenced by propagate().

                                        { 
     // The azimuth if the vector joining the cylinder and the helix axes
     double xC = helixCentreX();
     double yC = helixCentreY();
     return xC == 0.0 && yC == 0.0 ? 0.0 : std::atan2(yC,xC);
   }

double BaseParticlePropagator::helixCentrePhi	(	double	xC,
		double	yC
	)		const

inline

Definition at line 249 of file BaseParticlePropagator.h.

                                                            { 
     // Faster version of helixCentrePhi() 
     return xC == 0.0 && yC == 0.0 ? 0.0 : std::atan2(yC,xC);
   }

double BaseParticlePropagator::helixCentreX ( ) const

inline

The x coordinate of the helix axis.

Definition at line 207 of file BaseParticlePropagator.h.

References helixRadius(), helixStartPhi(), funct::sin(), and RawParticle::X().

Referenced by helixCentreDistToAxis(), helixCentrePhi(), propagate(), propagateToBeamCylinder(), propagateToClosestApproach(), and xyImpactParameter().

                                      { 
     // The x coordinate of the helix axis
     return X() - helixRadius() * std::sin ( helixStartPhi() );
   }

double BaseParticlePropagator::helixCentreX	(	double	radius,
		double	phi
	)		const

inline

Definition at line 212 of file BaseParticlePropagator.h.

References funct::sin(), and RawParticle::X().

                                                               { 
     // Fast version of helixCentreX()
     return X() - radius * std::sin (phi);
   }

double BaseParticlePropagator::helixCentreY ( ) const

inline

The y coordinate of the helix axis.

Definition at line 218 of file BaseParticlePropagator.h.

References funct::cos(), helixRadius(), helixStartPhi(), and RawParticle::Y().

Referenced by helixCentreDistToAxis(), helixCentrePhi(), propagate(), propagateToBeamCylinder(), propagateToClosestApproach(), and xyImpactParameter().

                                      { 
     // The y coordinate of the helix axis
     return Y() + helixRadius() * std::cos ( helixStartPhi() );
 }

double BaseParticlePropagator::helixCentreY	(	double	radius,
		double	phi
	)		const

inline

Definition at line 223 of file BaseParticlePropagator.h.

References funct::cos(), and RawParticle::Y().

                                                               { 
     // Fast version of helixCentreX()
     return Y() + radius * std::cos (phi);
   }

double BaseParticlePropagator::helixRadius ( ) const

inline

The helix Radius.

Definition at line 183 of file BaseParticlePropagator.h.

References c_light(), RawParticle::charge(), MillePedeFileConverter_cfg::e, and reco::tau::disc::Pt().

Referenced by helixCentreX(), helixCentreY(), propagate(), propagateToClosestApproach(), propagateToNominalVertex(), and xyImpactParameter().

                                     { 
     // The helix Radius
     //
     // The helix' Radius sign accounts for the orientation of the magnetic field 
     // (+ = along z axis) and the sign of the electric charge of the particle. 
     // It signs the rotation of the (charged) particle around the z axis: 
     // Positive means anti-clockwise, negative means clockwise rotation.
     //
     // The radius is returned in cm to match the units in RawParticle.
     return charge() == 0 ? 0.0 : - Pt() / ( c_light() * 1e-5 * bField * charge() );
   }

double BaseParticlePropagator::helixRadius ( double pT ) const

inline

Definition at line 195 of file BaseParticlePropagator.h.

References c_light(), RawParticle::charge(), and MillePedeFileConverter_cfg::e.

                                              { 
     // a faster version of helixRadius, once Perp() has been computed
     return charge() == 0 ? 0.0 : - pT / ( c_light() * 1e-5 * bField * charge() );
   }

double BaseParticlePropagator::helixStartPhi ( ) const

inline

The azimuth of the momentum at the vertex.

Definition at line 201 of file BaseParticlePropagator.h.

Referenced by helixCentreX(), helixCentreY(), propagate(), propagateToClosestApproach(), and xyImpactParameter().

                                       { 
     // The azimuth of the momentum at the vertex
     return Px() == 0.0 && Py() == 0.0 ? 0.0 : std::atan2(Py(),Px());
   }

void BaseParticlePropagator::increaseRCyl ( double delta )

inline

Just an internal trick.

Definition at line 171 of file BaseParticlePropagator.h.

References delta, rCyl, and xyImpactParameter().

171 {rCyl = rCyl + delta; rCyl2 = rCyl*rCyl; }

delta

dbl * delta

Definition: mlp_gen.cc:36

BaseParticlePropagator::rCyl

double rCyl

Simulated particle that is to be resp has been propagated.

Definition: BaseParticlePropagator.h:135

BaseParticlePropagator::rCyl2

double rCyl2

Definition: BaseParticlePropagator.h:136

void BaseParticlePropagator::init ( void )

Initialize internal switches and quantities.

Definition at line 23 of file BaseParticlePropagator.cc.

References debug, decayed, fiducial, firstLoop, propDir, properTime, and success.

Referenced by BaseParticlePropagator().

                              {
   
   // The status of the propagation
   success = 0;
   // Propagate only for the first half-loop
   firstLoop = true;
   //
   fiducial = true;
   // The particle has not yet decayed
   decayed = false;
   // The proper time is set to zero
   properTime = 0.;
   // The propagation direction is along the momentum
   propDir = 1;
   //
   debug = false;
 
 }

bool BaseParticlePropagator::inside ( ) const

inline

Is the vertex inside the cylinder ? (stricly inside : true)

Definition at line 255 of file BaseParticlePropagator.h.

References RawParticle::R2(), and RawParticle::Z().

Referenced by propagate().

255 {

256 return (R2()<rCyl2-0.00001*rCyl && fabs(Z())<zCyl-0.00001);}

BaseParticlePropagator::zCyl

double zCyl

Half-height of the cylinder (centred at 0,0,0) to which propagation is done.

Definition: BaseParticlePropagator.h:138

BaseParticlePropagator::rCyl

double rCyl

Simulated particle that is to be resp has been propagated.

Definition: BaseParticlePropagator.h:135

RawParticle::R2

double R2() const

vertex radius**2

Definition: RawParticle.h:279

RawParticle::Z

double Z() const

z of vertex

Definition: RawParticle.h:276

BaseParticlePropagator::rCyl2

double rCyl2

Definition: BaseParticlePropagator.h:136

bool BaseParticlePropagator::inside ( double rPos2 ) const

inline

Definition at line 258 of file BaseParticlePropagator.h.

References RawParticle::Z().

258 {

259 return (rPos2<rCyl2-0.00001*rCyl && fabs(Z())<zCyl-0.00001);}

BaseParticlePropagator::zCyl

double zCyl

Half-height of the cylinder (centred at 0,0,0) to which propagation is done.

Definition: BaseParticlePropagator.h:138

BaseParticlePropagator::rCyl

double rCyl

Simulated particle that is to be resp has been propagated.

Definition: BaseParticlePropagator.h:135

RawParticle::Z

double Z() const

z of vertex

Definition: RawParticle.h:276

BaseParticlePropagator::rCyl2

double rCyl2

Definition: BaseParticlePropagator.h:136

bool BaseParticlePropagator::onBarrel ( ) const

inline

Is the vertex already on the cylinder barrel ?

Definition at line 272 of file BaseParticlePropagator.h.

References RawParticle::R2(), and RawParticle::Z().

Referenced by onSurface(), and propagate().

                                {
     double rPos2 = R2();
     return ( fabs(rPos2-rCyl2) < 0.00001*rCyl && fabs(Z()) <= zCyl );
   }

bool BaseParticlePropagator::onBarrel ( double rPos2 ) const

inline

Definition at line 277 of file BaseParticlePropagator.h.

References RawParticle::Z().

                                            {
     return ( fabs(rPos2-rCyl2) < 0.00001*rCyl && fabs(Z()) <= zCyl );
   }

bool BaseParticlePropagator::onEndcap ( ) const

inline

Is the vertex already on the cylinder endcap ?

Definition at line 282 of file BaseParticlePropagator.h.

References RawParticle::R2(), and RawParticle::Z().

Referenced by onSurface(), and propagate().

                                {
     return ( fabs(fabs(Z())-zCyl) < 0.00001 && R2() <= rCyl2 ); 
   }

bool BaseParticlePropagator::onEndcap ( double rPos2 ) const

inline

Definition at line 286 of file BaseParticlePropagator.h.

References RawParticle::Z().

                                            {
     return ( fabs(fabs(Z())-zCyl) < 0.00001 && rPos2 <= rCyl2 ); 
   }

bool BaseParticlePropagator::onFiducial ( ) const

inline

Is the vertex on some material ?

Definition at line 291 of file BaseParticlePropagator.h.

References fiducial.

Referenced by TrajectoryManager::propagateToLayer().

291 { return fiducial; }

BaseParticlePropagator::fiducial

bool fiducial

The particle traverses some real material.

Definition: BaseParticlePropagator.h:150

bool BaseParticlePropagator::onSurface ( ) const

inline

Is the vertex already on the cylinder surface ?

Definition at line 263 of file BaseParticlePropagator.h.

References onBarrel(), and onEndcap().

Referenced by propagate().

                                 {
     return ( onBarrel() || onEndcap() ); 
   }

bool BaseParticlePropagator::onSurface ( double rPos2 ) const

inline

Definition at line 267 of file BaseParticlePropagator.h.

References onBarrel(), and onEndcap().

                                             {
     return ( onBarrel(rPos2) || onEndcap(rPos2) ); 
   }

bool BaseParticlePropagator::propagate ( )

Update the current instance, after the propagation of the particle to the surface of the cylinder

Definition at line 43 of file BaseParticlePropagator.cc.

References bField, RawParticle::charge(), funct::cos(), decayed, delta, hiPixelPairStep_cff::deltaPhi, firstLoop, helixCentreDistToAxis(), helixCentrePhi(), helixCentreX(), helixCentreY(), helixRadius(), helixStartPhi(), inside(), M_PI, RawParticle::mass(), min(), onBarrel(), onEndcap(), onSurface(), propDir, properDecayTime, properTime, PVValHelper::pT, reco::tau::disc::Pt(), RawParticle::R2(), TCMET_cfi::radius, rCyl, rCyl2, RawParticle::setVertex(), funct::sin(), mathSSE::sqrt(), success, RawParticle::T(), RawParticle::X(), RawParticle::Y(), RawParticle::Z(), and zCyl.

Referenced by PFTrackTransformer::addPoints(), PFTrackTransformer::addPointsAndBrems(), backPropagate(), ConvBremSeedProducer::produce(), propagated(), ParticlePropagator::propagateToBoundSurface(), propagateToEcal(), propagateToEcalEntrance(), propagateToHcalEntrance(), propagateToHcalExit(), propagateToHOLayer(), propagateToPreshowerLayer1(), propagateToPreshowerLayer2(), and propagateToVFcalEntrance().

                                   { 
 
 
   //
   // Check that the particle is not already on the cylinder surface
   //
   double rPos2 = R2();
 
   if ( onBarrel(rPos2) ) { 
     success = 1;
     return true;
   }
   //
   if ( onEndcap(rPos2) ) { 
     success = 2;
     return true;
   }
   //
   // Treat neutral particles (or no magnetic field) first 
   //
   if ( fabs(charge()) < 1E-12 || bField < 1E-12 ) {
 
     //
     // First check that the particle crosses the cylinder
     //
     double pT2 = Perp2();
     //    double pT2 = pT*pT;
     //    double b2 = rCyl * pT;
     double b2 = rCyl2 * pT2;
     double ac = fabs ( X()*Py() - Y()*Px() );
     double ac2 = ac*ac;
     //
     // The particle never crosses (or never crossed) the cylinder
     //
     //    if ( ac > b2 ) return false;
     if ( ac2 > b2 ) return false;
 
     //    double delta  = std::sqrt(b2*b2 - ac*ac);
     double delta  = std::sqrt(b2 - ac2);
     double tplus  = -( X()*Px()+Y()*Py() ) + delta;
     double tminus = -( X()*Px()+Y()*Py() ) - delta;
     //
     // Find the first (time-wise) intersection point with the cylinder
     //
 
     double solution = tminus < 0 ? tplus/pT2 : tminus/pT2;
     if ( solution < 0. ) return false;
     //
     // Check that the particle does (did) not exit from the endcaps first.
     //
     double zProp = Z() + Pz() * solution;
     if ( fabs(zProp) > zCyl ) {
       tplus  = ( zCyl - Z() ) / Pz();
       tminus = (-zCyl - Z() ) / Pz();
       solution = tminus < 0 ? tplus : tminus;
       if ( solution < 0. ) return false;
       zProp = Z() + Pz() * solution;
       success = 2;
     }
     else {
       success = 1;
     }
 
     //
     // Check the decay time
     //
     double delTime = propDir * mass() * solution;
     double factor = 1.;
     properTime += delTime;
     if ( properTime > properDecayTime ) {
       factor = 1.-(properTime-properDecayTime)/delTime;
       properTime = properDecayTime;
       decayed = true;
     }
 
     //
     // Compute the coordinates of the RawParticle after propagation
     //
     double xProp = X() + Px() * solution * factor;
     double yProp = Y() + Py() * solution * factor;
            zProp = Z() + Pz() * solution * factor;
     double tProp = T() + E()  * solution * factor;
 
     //
     // Last check : Although propagated to the endcaps, R could still be
     // larger than rCyl because the cylinder was too short...
     //
     if ( success == 2 && xProp*xProp+yProp*yProp > rCyl2 ) { 
       success = -1;
       return true;
     }
 
     //
     // ... and update the particle with its propagated coordinates
     //
     setVertex( XYZTLorentzVector(xProp,yProp,zProp,tProp) );
     
     return true;
   }
   //
   // Treat charged particles with magnetic field next.
   //
   else {
     //
     // First check that the particle can cross the cylinder
     //
     double pT = Pt();
     double radius = helixRadius(pT);
     double phi0 = helixStartPhi();
     double xC = helixCentreX(radius,phi0);
     double yC = helixCentreY(radius,phi0);
     double dist = helixCentreDistToAxis(xC,yC);
     //
     // The helix either is outside or includes the cylinder -> no intersection
     //
     if ( fabs ( fabs(radius) - dist ) > rCyl ) return false;
     //
     // The particle is already away from the endcaps, and will never come back
     // Could be back-propagated, so warn the user that it is so.
     // 
     if ( Z() * Pz() > zCyl * fabs(Pz()) ) { 
       success = -2;
       return true;
     }
 
     double pZ = Pz();
     double phiProp, zProp;
     //
     // Does the helix cross the cylinder barrel ? If not, do the first half-loop
     //
     double rProp = std::min(fabs(radius)+dist-0.000001, rCyl);
 
     // Check for rounding errors in the ArcSin.
     double sinPhiProp = 
       (rProp*rProp-radius*radius-dist*dist)/( 2.*dist*radius);
     
     //
     double deltaPhi = 1E99;
 
     // Taylor development up to third order for large momenta 
     if ( 1.-fabs(sinPhiProp) < 1E-9 ) { 
 
       double cphi0 = std::cos(phi0);
       double sphi0 = std::sin(phi0);
       double r0 = (X()*cphi0 + Y()*sphi0)/radius;
       double q0 = (X()*sphi0 - Y()*cphi0)/radius;
       double rcyl2 = (rCyl2 - X()*X() - Y()*Y())/(radius*radius);
       double delta = r0*r0 + rcyl2*(1.-q0);
 
       // This is a solution of a second order equation, assuming phi = phi0 + epsilon
       // and epsilon is small. 
       deltaPhi = radius > 0 ? 
     ( -r0 + std::sqrt(delta ) ) / (1.-q0) :   
     ( -r0 - std::sqrt(delta ) ) / (1.-q0); 
       
     }
 
     // Use complete calculation otherwise, or if the delta phi is large anyway.
     if ( fabs(deltaPhi) > 1E-3 ) { 
 
     //    phiProp =  fabs(sinPhiProp) < 0.99999999  ? 
     //      std::asin(sinPhiProp) : M_PI/2. * sinPhiProp;
       phiProp =  std::asin(sinPhiProp);
 
       //
       // Compute phi after propagation (two solutions, but the asin definition
       // (between -pi/2 and +pi/2) takes care of the wrong one.
       //
       phiProp = helixCentrePhi(xC,yC) + 
     ( inside(rPos2) || onSurface(rPos2) ? phiProp : M_PI-phiProp ); 
       
       //
       // Solve the obvious two-pi ambiguities: more than one turn!
       //
       if ( fabs(phiProp - phi0) > 2.*M_PI )
     phiProp += ( phiProp > phi0 ? -2.*M_PI : +2.*M_PI );
       
       //
       // Check that the phi difference has the right sign, according to Q*B
       // (Another two pi ambuiguity, slightly more subtle)
       //
       if ( (phiProp-phi0)*radius < 0.0 )
     radius > 0.0 ? phiProp += 2 * M_PI : phiProp -= 2 * M_PI;
       
     } else { 
 
       // Use Taylor
       phiProp = phi0 + deltaPhi;
 
     }
 
     //
     // Check that the particle does not exit from the endcaps first.
     //
     zProp = Z() + ( phiProp - phi0 ) * pZ * radius / pT ;
     if ( fabs(zProp) > zCyl ) {
 
       zProp = zCyl * fabs(pZ)/pZ;
       phiProp = phi0 + (zProp - Z()) / radius * pT / pZ;
       success = 2;
 
     } else {
 
       //
       // If the particle does not cross the barrel, either process the
       // first-half loop only or propagate all the way down to the endcaps
       //
       if ( rProp < rCyl ) {
 
     if ( firstLoop || fabs(pZ)/pT < 1E-10 ) {
 
       success = 0;
 
     } else {
 
       zProp = zCyl * fabs(pZ)/pZ;
       phiProp = phi0 + (zProp - Z()) / radius * pT / pZ;
       success = 2;
 
     }
       //
       // The particle crossed the barrel 
       // 
       } else {
 
     success = 1;
 
       }
     }
     //
     // Compute the coordinates of the RawParticle after propagation
     //
     //
     // Check the decay time
     //
     double delTime = propDir * (phiProp-phi0)*radius*mass() / pT;
     double factor = 1.;
     properTime += delTime;
     if ( properTime > properDecayTime ) {
       factor = 1.-(properTime-properDecayTime)/delTime;
       properTime = properDecayTime;
       decayed = true;
     }
 
     zProp = Z() + (zProp-Z())*factor;
 
     phiProp = phi0 + (phiProp-phi0)*factor;
 
     double sProp = std::sin(phiProp);
     double cProp = std::cos(phiProp);
     double xProp = xC + radius * sProp;
     double yProp = yC - radius * cProp;
     double tProp = T() + (phiProp-phi0)*radius*E()/pT;
     double pxProp = pT * cProp;
     double pyProp = pT * sProp;
 
     //
     // Last check : Although propagated to the endcaps, R could still be
     // larger than rCyl because the cylinder was too short...
     //
     if ( success == 2 && xProp*xProp+yProp*yProp > rCyl2 ) { 
       success = -1;
       return true;
     }
     //
     // ... and update the particle vertex and momentum
     //
     setVertex( XYZTLorentzVector(xProp,yProp,zProp,tProp) );
     SetXYZT(pxProp,pyProp,pZ,E());
     //    SetPx(pxProp);
     //    SetPy(pyProp);
     return true;
  
   }
 }

BaseParticlePropagator BaseParticlePropagator::propagated ( ) const

Return a new instance, corresponding to the particle propagated to the surface of the cylinder

Definition at line 335 of file BaseParticlePropagator.cc.

References backPropagate(), firstLoop, propagate(), and success.

Referenced by ParticlePropagator::propagated().

                                          {
   // Copy the input particle in a new instance
   BaseParticlePropagator myPropPart(*this);
   // Allow for many loops
   myPropPart.firstLoop=false;
   // Propagate the particle ! 
   myPropPart.propagate();
   // Back propagate if the forward propagation was not a success
   if (myPropPart.success < 0 )
     myPropPart.backPropagate();
   // Return the new instance
   return myPropPart;
 }

bool BaseParticlePropagator::propagateToBeamCylinder	(	const XYZTLorentzVector &	v,
		double	radius = `0.`
	)

Definition at line 630 of file BaseParticlePropagator.cc.

References a, b, bField, EnergyCorrector::c, c_light(), RawParticle::charge(), funct::cos(), gather_cfg::cout, PVValHelper::dx, PVValHelper::dy, PVValHelper::dz, MillePedeFileConverter_cfg::e, helixCentreDistToAxis(), helixCentreX(), helixCentreY(), mps_fire::i, propagateToClosestApproach(), PVValHelper::pT, reco::tau::disc::Pt(), RawParticle::r(), RawParticle::r2(), TCMET_cfi::radius, RawParticle::setCharge(), funct::sin(), mathSSE::sqrt(), RawParticle::X(), RawParticle::Y(), and RawParticle::Z().

 {
 
   // For neutral (or BField = 0, simply check that the track passes through the cylinder
   if ( charge() == 0. || bField == 0.) 
     return fabs( Px() * Y() - Py() * X() ) / Pt() < radius; 
 
   // Now go to the charged particles
 
   // A few needed intermediate variables (to make the code understandable)
   // The inner cylinder
   double r = radius;
   double r2 = r*r;
   double r4 = r2*r2;
   // The two hits
   double dx = X()-v.X();
   double dy = Y()-v.Y();
   double dz = Z()-v.Z();
   double Sxy = X()*v.X() + Y()*v.Y();
   double Dxy = Y()*v.X() - X()*v.Y();
   double Dxy2 = Dxy*Dxy;
   double Sxy2 = Sxy*Sxy;
   double SDxy = dx*dx + dy*dy;
   double SSDxy = std::sqrt(SDxy);
   double ATxy = std::atan2(dy,dx);
   // The coefficients of the second order equation for the trajectory radius
   double a = r2 - Dxy2/SDxy;
   double b = r * (r2 - Sxy);
   double c = r4 - 2.*Sxy*r2 + Sxy2 + Dxy2;
 
   // Here are the four possible solutions for
   // 1) The trajectory radius
   std::vector<double> helixRs(4,static_cast<double>(0.));
   helixRs[0] = (b - std::sqrt(b*b - a*c))/(2.*a); 
   helixRs[1] = (b + std::sqrt(b*b - a*c))/(2.*a); 
   helixRs[2] = -helixRs[0]; 
   helixRs[3] = -helixRs[1]; 
   // 2) The azimuthal direction at the second point
   std::vector<double> helixPhis(4,static_cast<double>(0.));
   helixPhis[0] = std::asin ( SSDxy/(2.*helixRs[0]) );
   helixPhis[1] = std::asin ( SSDxy/(2.*helixRs[1]) );
   helixPhis[2] = -helixPhis[0];
   helixPhis[3] = -helixPhis[1];
   // Only two solutions are valid though
   double solution1=0.;
   double solution2=0.;
   double phi1=0.;
   double phi2=0.;
   // Loop over the four possibilities
   for ( unsigned int i=0; i<4; ++i ) {
     helixPhis[i] = ATxy + helixPhis[i];
     // The centre of the helix
     double xC = helixCentreX(helixRs[i],helixPhis[i]);
     double yC = helixCentreY(helixRs[i],helixPhis[i]);
     // The distance of that centre to the origin
     double dist = helixCentreDistToAxis(xC, yC);
     /*
     std::cout << "Solution "<< i << " = " << helixRs[i] << " accepted ? " 
           << fabs(fabs(helixRs[i]) - dist ) << " - " << radius << " = " 
           << fabs(fabs(helixRs[i]) - dist ) - fabs(radius) << " " 
           << ( fabs( fabs(fabs(helixRs[i]) - dist) -fabs(radius) ) < 1e-6)  << std::endl;
     */
     // Check that the propagation will lead to a trajectroy tangent to the inner cylinder
     if ( fabs( fabs(fabs(helixRs[i]) - dist) -fabs(radius) ) < 1e-6 ) { 
       // Fill first solution
       if ( solution1 == 0. ) { 
     solution1 = helixRs[i];
     phi1 = helixPhis[i];
       // Fill second solution (ordered)
       } else if ( solution2 == 0. ) {
     if ( helixRs[i] < solution1 ) {
       solution2 = solution1;
       solution1 = helixRs[i];
       phi2 = phi1;
       phi1 = helixPhis[i];
     } else {
       solution2 = helixRs[i];
       phi2 = helixPhis[i];
     }
       // Must not happen! 
       } else { 
     std::cout << "warning !!! More than two solutions for this track !!! " << std::endl;
       }
     }
   }
 
   // Find the largest possible pT compatible with coming from within the inne cylinder
   double pT = 0.;
   double helixPhi = 0.;
   double helixR = 0.;
   // This should not happen
   if ( solution1*solution2 == 0. ) { 
     std::cout << "warning !!! Less than two solution for this track! " 
           << solution1 << " " << solution2 << std::endl;
     return false;
   // If the two solutions have opposite sign, it means that pT = infinity is a possibility.
   } else if ( solution1*solution2 < 0. ) { 
     pT = 1000.;
     double norm = pT/SSDxy;
     setCharge(+1.);
     SetXYZT(dx*norm,dy*norm,dz*norm,0.);
     SetE(std::sqrt(Vect().Mag2()));
   // Otherwise take the solution that gives the largest transverse momentum 
   } else { 
     if (solution1<0.) { 
       helixR   = solution1;
       helixPhi = phi1;
       setCharge(+1.);
     } else {
       helixR = solution2;
       helixPhi = phi2;
       setCharge(-1.);
     }
     pT = fabs(helixR) * 1e-5 * c_light() *bField;
     double norm = pT/SSDxy;
     SetXYZT(pT*std::cos(helixPhi),pT*std::sin(helixPhi),dz*norm,0.);
     SetE(std::sqrt(Vect().Mag2()));      
   }
     
   // Propagate to closest approach to get the Z value (a bit of an overkill)
   return propagateToClosestApproach();
   
 }

bool BaseParticlePropagator::propagateToClosestApproach	(	double	x0 = `0.`,
		double	y0 = `0`,
		bool	first = `true`
	)

Update the particle after propagation to the closest approach from Z axis, to the preshower layer 1 & 2, to the ECAL entrance, to the HCAL entrance, the HCAL 2nd and 3rd layer (not coded yet), the VFCAL entrance, or any BoundSurface(disk or cylinder)

Definition at line 358 of file BaseParticlePropagator.cc.

References backPropagate(), bField, RawParticle::charge(), helixCentreDistToAxis(), helixCentreX(), helixCentreY(), helixRadius(), helixStartPhi(), RawParticle::momentum(), PVValHelper::pT, reco::tau::disc::Pt(), TCMET_cfi::radius, setPropagationConditions(), RawParticle::setVertex(), mathSSE::sqrt(), RawParticle::vertex(), RawParticle::X(), RawParticle::Y(), and RawParticle::z().

Referenced by propagateToBeamCylinder(), ParticlePropagator::propagateToClosestApproach(), and propagateToNominalVertex().

                                                                                    {
 
   // Pre-computed quantities
   double pT = Pt();
   double radius = helixRadius(pT);
   double phi0 = helixStartPhi();
 
   // The Helix centre coordinates are computed wrt to the z axis
   // Actually the z axis might be centred on 0,0: it's the beam spot position (x0,y0)!
   double xC = helixCentreX(radius,phi0);
   double yC = helixCentreY(radius,phi0);
   double distz = helixCentreDistToAxis(xC-x0,yC-y0);
   double dist0 = helixCentreDistToAxis(xC,yC);
 
   //
   // Propagation to point of clostest approach to z axis
   //
   double rz,r0,z;
   if ( charge() != 0.0 && bField != 0.0 ) {
     rz = fabs ( fabs(radius) - distz ) + std::sqrt(x0*x0+y0*y0) + 0.0000001;
     r0 = fabs ( fabs(radius) - dist0 ) + 0.0000001;
   } else {
     rz = fabs( Px() * (Y()-y0) - Py() * (X()-x0) ) / Pt(); 
     r0 = fabs( Px() *  Y()     - Py() *  X() ) / Pt(); 
   }
 
   z = 999999.;
 
   // Propagate to the first interesection point 
   // with cylinder of radius sqrt(x0**2+y0**2)
   setPropagationConditions(rz , z, first);
   bool done = backPropagate();
 
   // Unsuccessful propagation - should not happen!
   if ( !done ) return done; 
 
   // The z axis is (0,0) - no need to go further
   if ( fabs(rz-r0) < 1E-10 ) return done;
   double dist1 = (X()-x0)*(X()-x0) + (Y()-y0)*(Y()-y0);
 
   // We are already at closest approach - no need to go further
   if ( dist1 < 1E-10 ) return done;
 
   // Keep for later if it happens to be the right solution
   XYZTLorentzVector vertex1 = vertex();
   XYZTLorentzVector momentum1 = momentum();
   
   // Propagate to the distance of closest approach to (0,0)
   setPropagationConditions(r0 , z, first);
   done = backPropagate();
   if ( !done ) return done; 
 
   // Propagate to the first interesection point 
   // with cylinder of radius sqrt(x0**2+y0**2)
   setPropagationConditions(rz , z, first);
   done = backPropagate();
   if ( !done ) return done; 
   double dist2 = (X()-x0)*(X()-x0) + (Y()-y0)*(Y()-y0);
 
   // Keep the good solution.
   if ( dist2 > dist1 ) { 
     setVertex(vertex1);
     SetXYZT(momentum1.X(),momentum1.Y(),momentum1.Z(),momentum1.E());
     dist2 = dist1;
   }
 
   // Done
   return done;
 
 }

bool BaseParticlePropagator::propagateToEcal ( bool first = true )

Definition at line 430 of file BaseParticlePropagator.cc.

References propagate(), and setPropagationConditions().

                                                   {
   //
   // Propagation to Ecal (including preshower) after the
   // last Tracker layer
   // TODO: include proper geometry
   // Geometry taken from CMS ECAL TDR
   //
   // First propagate to global barrel / endcap cylinder 
   //  setPropagationConditions(1290. , 3045 , first);
   //  New position of the preshower as of CMSSW_1_7_X
   setPropagationConditions(129.0 , 303.353 , first);
   return propagate();
 
 }

bool BaseParticlePropagator::propagateToEcalEntrance ( bool first = true )

Definition at line 487 of file BaseParticlePropagator.cc.

References RawParticle::cos2ThetaV(), propagate(), setPropagationConditions(), and success.

Referenced by PFTrackTransformer::addPointsAndBrems(), AntiElectronIDMVA6::atECalEntrance(), FBaseSimEvent::fill(), ConvBremSeedProducer::GoodCluster(), and TrajectoryManager::propagateToCalorimeters().

                                                           {
   //
   // Propagation to ECAL entrance
   // TODO: include proper geometry
   // Geometry taken from CMS ECAL TDR
   //
   // First propagate to global barrel / endcap cylinder 
   setPropagationConditions(129.0 , 320.9,first);
   bool done = propagate();
 
   // Go to endcap cylinder in the "barrel cut corner" 
   // eta = 1.479 -> cos^2(theta) = 0.81230
   //  if ( done && eta > 1.479 && success == 1 ) {
   if ( done && cos2ThetaV() > 0.81230 && success == 1 ) {
     setPropagationConditions(152.6 , 320.9, first);
     done = propagate();
   }
 
   // We are not in the ECAL acceptance
   // eta = 3.0 -> cos^2(theta) = 0.99013
   if ( cos2ThetaV() > 0.99014 ) success = 0;
 
   return done;
 }

bool BaseParticlePropagator::propagateToHcalEntrance ( bool first = true )

Definition at line 513 of file BaseParticlePropagator.cc.

References RawParticle::cos2ThetaV(), propagate(), propDir, setPropagationConditions(), and success.

Referenced by PFTrackTransformer::addPointsAndBrems(), FBaseSimEvent::fill(), and TrajectoryManager::propagateToCalorimeters().

                                                           {
   //
   // Propagation to HCAL entrance
   // TODO: include proper geometry
   // Geometry taken from CMSSW_3_1_X xml (Sunanda)
   //
 
   // First propagate to global barrel / endcap cylinder 
   setPropagationConditions(177.5 , 335.0, first);
   propDir = 0;
   bool done = propagate();
   propDir = 1;
 
   // If went through the bottom of HB cylinder -> re-propagate to HE surface
   if (done && success == 2) {
     setPropagationConditions(300.0, 400.458, first);
     propDir = 0;
     done = propagate();
     propDir = 1;
   }
 
 
   // out of the HB/HE acceptance
   // eta = 3.0 -> cos^2(theta) = 0.99014
   if ( done && cos2ThetaV() > 0.99014 ) success = 0;
 
   return done;
 }

bool BaseParticlePropagator::propagateToHcalExit ( bool first = true )

Definition at line 566 of file BaseParticlePropagator.cc.

References propagate(), propDir, and setPropagationConditions().

Referenced by PFTrackTransformer::addPointsAndBrems(), and FBaseSimEvent::fill().

                                                       {
   //
   // Propagation to HCAL exit
   // TODO: include proper geometry
   // Geometry taken from CMSSW_3_1_X xml (Sunanda)
   //
 
   // Approximate it to a single cylinder as it is not that crucial.
   setPropagationConditions(263.9 , 554.1, first);
   //  this->rawPart().setCharge(0.0); ?? Shower Propagation ??
   propDir = 0;
   bool done = propagate();
   propDir = 1;
 
   return done;
 }

bool BaseParticlePropagator::propagateToHOLayer ( bool first = true )

Definition at line 584 of file BaseParticlePropagator.cc.

References funct::abs(), propagate(), propDir, setPropagationConditions(), success, and RawParticle::Z().

Referenced by PFTrackTransformer::addPointsAndBrems(), and FBaseSimEvent::fill().

                                                      {
   //
   // Propagation to Layer0 of HO (Ring-0)
   // TODO: include proper geometry
   // Geometry taken from CMSSW_3_1_X xml (Sunanda)
   //
 
   // Approximate it to a single cylinder as it is not that crucial.
   setPropagationConditions(387.6, 1000.0, first); //Dia is the middle of HO \sqrt{384.8**2+46.2**2}
   //  setPropagationConditions(410.2, 1000.0, first); //sqrt{406.6**2+54.2**2} //for outer layer
   //  this->rawPart().setCharge(0.0); ?? Shower Propagation ??
   propDir = 0;
   bool done = propagate();
   propDir = 1;
   
   if ( done && std::abs(Z()) > 700.25) success = 0;
   
   return done;
 }

bool BaseParticlePropagator::propagateToNominalVertex ( const XYZTLorentzVector & hit2 = XYZTLorentzVector(0.,0.,0.,0.) )

Definition at line 606 of file BaseParticlePropagator.cc.

References bField, RawParticle::charge(), funct::cos(), PVValHelper::dx, PVValHelper::dy, helixRadius(), phi, propagateToClosestApproach(), EnergyCorrector::pt, PVValHelper::pT, funct::sin(), mathSSE::sqrt(), RawParticle::X(), and RawParticle::Y().

Referenced by ParticlePropagator::propagateToNominalVertex().

 {
 
 
   // Not implemented for neutrals (used for electrons only)
   if ( charge() == 0. || bField == 0.) return false;
 
   // Define the proper pT direction to meet the point (vx,vy) in (x,y)
   double dx = X()-v.X();
   double dy = Y()-v.Y();
   double phi = std::atan2(dy,dx) + std::asin ( std::sqrt(dx*dx+dy*dy)/(2.*helixRadius()) );
 
   // The absolute pT (kept to the original value)
   double pT = pt();
 
   // Set the new pT
   SetPx(pT*std::cos(phi));
   SetPy(pT*std::sin(phi));
 
   return propagateToClosestApproach(v.X(),v.Y());
   
 }

bool BaseParticlePropagator::propagateToPreshowerLayer1 ( bool first = true )

Definition at line 446 of file BaseParticlePropagator.cc.

References propagate(), RawParticle::R2(), setPropagationConditions(), and success.

Referenced by PFTrackTransformer::addPointsAndBrems(), FBaseSimEvent::fill(), and TrajectoryManager::propagateToCalorimeters().

                                                              {
   //
   // Propagation to Preshower Layer 1
   // TODO: include proper geometry
   // Geometry taken from CMS ECAL TDR
   //
   // First propagate to global barrel / endcap cylinder 
   //  setPropagationConditions(1290., 3045 , first);
   //  New position of the preshower as of CMSSW_1_7_X
   setPropagationConditions(129.0, 303.353 , first);
   bool done = propagate();
 
   // Check that were are on the Layer 1 
   if ( done && (R2() > 125.0*125.0 || R2() < 45.0*45.0) ) 
     success = 0;
   
   return done;
 }

bool BaseParticlePropagator::propagateToPreshowerLayer2 ( bool first = true )

Definition at line 466 of file BaseParticlePropagator.cc.

References propagate(), RawParticle::R2(), setPropagationConditions(), and success.

Referenced by PFTrackTransformer::addPointsAndBrems(), FBaseSimEvent::fill(), and TrajectoryManager::propagateToCalorimeters().

                                                              {
   //
   // Propagation to Preshower Layer 2
   // TODO: include proper geometry
   // Geometry taken from CMS ECAL TDR
   //
   // First propagate to global barrel / endcap cylinder 
   //  setPropagationConditions(1290. , 3090 , first);
   //  New position of the preshower as of CMSSW_1_7_X
   setPropagationConditions(129.0 , 307.838 , first);
   bool done = propagate();
 
   // Check that we are on Layer 2 
   if ( done && (R2() > 125.0*125.0 || R2() < 45.0*45.0 ) )
     success = 0;
 
   return done;
 
 }

bool BaseParticlePropagator::propagateToVFcalEntrance ( bool first = true )

Definition at line 543 of file BaseParticlePropagator.cc.

References RawParticle::cos2ThetaV(), propagate(), propDir, setPropagationConditions(), and success.

Referenced by FBaseSimEvent::fill(), and TrajectoryManager::propagateToCalorimeters().

                                                            {
   //
   // Propagation to VFCAL entrance
   // TODO: include proper geometry
   // Geometry taken from DAQ TDR Chapter 13
 
   setPropagationConditions(400.0 , 1110.0, first);
   propDir = 0;
   bool done = propagate();
   propDir = 1;
 
   if (!done) success = 0;
 
   // We are not in the VFCAL acceptance
   // eta = 3.0  -> cos^2(theta) = 0.99014
   // eta = 5.2  -> cos^2(theta) = 0.9998755
   double c2teta = cos2ThetaV();
   if ( done && ( c2teta < 0.99014 || c2teta > 0.9998755 ) ) success = 0;
 
   return done;
 }

void BaseParticlePropagator::resetDebug ( )

inline

Definition at line 307 of file BaseParticlePropagator.h.

307 { debug = false; }

BaseParticlePropagator::debug

bool debug

The debug level.

Definition: BaseParticlePropagator.h:144

void BaseParticlePropagator::setDebug ( )

inline

Set the debug leve;.

Definition at line 306 of file BaseParticlePropagator.h.

306 { debug = true; }

BaseParticlePropagator::debug

bool debug

The debug level.

Definition: BaseParticlePropagator.h:144

void BaseParticlePropagator::setMagneticField ( double b )

inline

Set the magnetic field.

Definition at line 300 of file BaseParticlePropagator.h.

References b.

Referenced by PFTrackTransformer::addPointsAndBrems(), FBaseSimEvent::fill(), ParticlePropagator::ParticlePropagator(), ParticlePropagator::propagateToBoundSurface(), ParticlePropagator::propagateToClosestApproach(), and ParticlePropagator::propagateToNominalVertex().

300 { bField=b; }

b

double b

Definition: hdecay.h:120

BaseParticlePropagator::bField

double bField

Magnetic field in the cylinder, oriented along the Z axis.

Definition: BaseParticlePropagator.h:140

void BaseParticlePropagator::setPropagationConditions	(	double	r,
		double	z,
		bool	firstLoop = `true`
	)

Set the propagation characteristics (rCyl, zCyl and first loop only)

Definition at line 350 of file BaseParticlePropagator.cc.

References f, firstLoop, RawParticle::R(), rCyl, rCyl2, RawParticle::Z(), and zCyl.

Referenced by PFTrackTransformer::addPoints(), PFTrackTransformer::addPointsAndBrems(), propagateToClosestApproach(), propagateToEcal(), propagateToEcalEntrance(), propagateToHcalEntrance(), propagateToHcalExit(), propagateToHOLayer(), propagateToPreshowerLayer1(), propagateToPreshowerLayer2(), propagateToVFcalEntrance(), and ParticlePropagator::setPropagationConditions().

                                                                            { 
   rCyl = R;
   rCyl2 = R*R;
   zCyl = Z;
   firstLoop = f;
 }

void BaseParticlePropagator::setProperDecayTime ( double t )

inline

Set the proper decay time.

Definition at line 168 of file BaseParticlePropagator.h.

References RawParticle::t().

Referenced by ParticlePropagator::initProperDecayTime(), and ParticlePropagator::ParticlePropagator().

168 { properDecayTime = t; }

RawParticle::t

double t() const

vertex time

Definition: RawParticle.h:273

BaseParticlePropagator::properDecayTime

double properDecayTime

The proper decay time of the particle.

Definition: BaseParticlePropagator.h:142

double BaseParticlePropagator::xyImpactParameter	(	double	x0 = `0.`,
		double	y0 = `0.`
	)		const

Transverse impact parameter.

Definition at line 755 of file BaseParticlePropagator.cc.

References bField, RawParticle::charge(), helixCentreDistToAxis(), helixCentreX(), helixCentreY(), helixRadius(), helixStartPhi(), PVValHelper::pT, reco::tau::disc::Pt(), TCMET_cfi::radius, RawParticle::X(), and RawParticle::Y().

Referenced by increaseRCyl().

                                                                     {
 
   double ip=0.;
   double pT = Pt();
 
   if ( charge() != 0.0 && bField != 0.0 ) {
     double radius = helixRadius(pT);
     double phi0 = helixStartPhi();
     
     // The Helix centre coordinates are computed wrt to the z axis
     double xC = helixCentreX(radius,phi0);
     double yC = helixCentreY(radius,phi0);
     double distz = helixCentreDistToAxis(xC-x0,yC-y0);
     ip = distz - fabs(radius);
   } else {
     ip = fabs( Px() * (Y()-y0) - Py() * (X()-x0) ) / pT; 
   }
 
   return ip;
 
 }

double BaseParticlePropagator::zImpactParameter	(	double	x0 = `0`,
		double	y0 = `0.`
	)		const

inline

Longitudinal impact parameter.

Definition at line 177 of file BaseParticlePropagator.h.

References mathSSE::sqrt(), RawParticle::X(), RawParticle::Y(), and RawParticle::Z().

                                                                   {
     // Longitudinal impact parameter
     return Z() - Pz() * std::sqrt( ((X()-x0)*(X()-x0) + (Y()-y0)*(Y()-y0) ) / Perp2());
   }