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Functions | Variables
UKUtility.cc File Reference
#include "TLorentzVector.h"
#include "TVector3.h"
#include "GeneratorInterface/Hydjet2Interface/interface/Particle.h"
#include "GeneratorInterface/Hydjet2Interface/interface/UKUtility.h"
#include "CLHEP/Random/RandomEngine.h"
#include "CLHEP/Random/RandFlat.h"

Go to the source code of this file.

Functions

void IsotropicR3 (double r, double *x, double *y, double *z)
 
void IsotropicR3 (double r, TVector3 &pos)
 
void MomAntiMom (TLorentzVector &mom, double mass, TLorentzVector &antiMom, double antiMass, double initialMass)
 

Variables

const double fermi = 1.
 
const double GeV = 1.
 
const double hbarc = 0.197 * GeV * fermi
 
const double hbarc_squared = hbarc * hbarc
 
CLHEP::HepRandomEngine * hjRandomEngine
 
const double w = 1.0 / 0.1973
 

Function Documentation

◆ IsotropicR3() [1/2]

void IsotropicR3 ( double  r,
double *  x,
double *  y,
double *  z 
)

Definition at line 26 of file UKUtility.cc.

26  {
27  double pZ = 1. - 2. * (CLHEP::RandFlat::shoot(hjRandomEngine));
28  double st = TMath::Sqrt(1. - pZ * pZ) * r;
29  double phi = 2. * TMath::Pi() * (CLHEP::RandFlat::shoot(hjRandomEngine));
30 
31  *x = st * cos(phi);
32  *y = st * sin(phi);
33  *z = pZ * r;
34 }

References funct::cos(), hjRandomEngine, PVValHelper::phi, Pi, alignCSCRings::r, funct::sin(), genVertex_cff::x, detailsBasic3DVector::y, and detailsBasic3DVector::z.

Referenced by MomAntiMom().

◆ IsotropicR3() [2/2]

void IsotropicR3 ( double  r,
TVector3 &  pos 
)

Definition at line 36 of file UKUtility.cc.

36  {
37  double pZ = 1. - 2. * (CLHEP::RandFlat::shoot(hjRandomEngine));
38  double st = TMath::Sqrt(1. - pZ * pZ) * r;
39  double phi = 2. * TMath::Pi() * (CLHEP::RandFlat::shoot(hjRandomEngine));
40  pos.SetX(st * TMath::Cos(phi));
41  pos.SetY(st * TMath::Sin(phi));
42  pos.SetZ(pZ * r);
43 }

References hjRandomEngine, PVValHelper::phi, Pi, and alignCSCRings::r.

◆ MomAntiMom()

void MomAntiMom ( TLorentzVector &  mom,
double  mass,
TLorentzVector &  antiMom,
double  antiMass,
double  initialMass 
)

Definition at line 45 of file UKUtility.cc.

45  {
46  double r = initialMass * initialMass - mass * mass - antiMass * antiMass;
47  if (r * r - 4 * mass * mass * antiMass * antiMass < 0.)
48  throw "MomAntiMom";
49 
50  double pAbs = .5 * TMath::Sqrt(r * r - 4 * mass * mass * antiMass * antiMass) / initialMass;
51  TVector3 mom3;
52  IsotropicR3(pAbs, mom3);
53  mom.SetVectM(mom3, mass);
54  antiMom.SetVectM(-mom3, antiMass);
55 }

References IsotropicR3(), EgHLTOffHistBins_cfi::mass, and alignCSCRings::r.

Referenced by Decay().

Variable Documentation

◆ fermi

const double fermi = 1.

Definition at line 21 of file UKUtility.cc.

◆ GeV

const double GeV = 1.

Definition at line 20 of file UKUtility.cc.

◆ hbarc

const double hbarc = 0.197 * GeV * fermi

Definition at line 22 of file UKUtility.cc.

◆ hbarc_squared

const double hbarc_squared = hbarc * hbarc

Definition at line 24 of file UKUtility.cc.

◆ hjRandomEngine

CLHEP::HepRandomEngine* hjRandomEngine

◆ w

const double w = 1.0 / 0.1973

Definition at line 23 of file UKUtility.cc.

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detailsBasic3DVector::z
float float float z
Definition: extBasic3DVector.h:14
IsotropicR3
void IsotropicR3(double r, double *x, double *y, double *z)
Definition: UKUtility.cc:26
pos
Definition: PixelAliasList.h:18
funct::sin
Sin< T >::type sin(const T &t)
Definition: Sin.h:22
funct::cos
Cos< T >::type cos(const T &t)
Definition: Cos.h:22
PVValHelper::phi
Definition: PVValidationHelpers.h:69
hjRandomEngine
CLHEP::HepRandomEngine * hjRandomEngine
Definition: Hydjet2Hadronizer.h:55
alignCSCRings.r
r
Definition: alignCSCRings.py:93
genVertex_cff.x
x
Definition: genVertex_cff.py:12
EgHLTOffHistBins_cfi.mass
mass
Definition: EgHLTOffHistBins_cfi.py:34
detailsBasic3DVector::y
float float y
Definition: extBasic3DVector.h:14
Pi
const double Pi
Definition: CosmicMuonParameters.h:18