PPSTools Namespace Reference

Classes
struct	FullBeamInfo
struct	LimitedBeamInfo

Functions
void	Get_t_and_xi (const TLorentzVector *proton, double &t, double &xi, LimitedBeamInfo const &bi)
TLorentzVector	HectorParticle2LorentzVector (H_BeamParticle hp, int)
void	LorentzBoost (H_BeamParticle &h_p, int dir, const std::string &frame, FullBeamInfo const &bi)
void	LorentzBoost (TLorentzVector &p_out, const std::string &frame, FullBeamInfo const &bi)
void	LorentzBoost (HepMC::GenParticle &p_out, const std::string &frame, FullBeamInfo const &bi)
H_BeamParticle	LorentzVector2HectorParticle (TLorentzVector p)

Variables
const double	ProtonMass = CLHEP::proton_mass_c2 / GeV
const double	ProtonMassSQ = pow(ProtonMass, 2)
const double	urad = 1. / 1000000.

Function Documentation

void PPSTools::Get_t_and_xi	(	const TLorentzVector *	proton,
		double &	t,
		double &	xi,
		LimitedBeamInfo const &	bi
	)

Definition at line 72 of file PPSUtilities.cc.

References funct::cos(), relval_parameters_module::energy, PPSTools::LimitedBeamInfo::fBeamEnergy, PPSTools::LimitedBeamInfo::fBeamMomentum, Pi, ProtonMassSQ, mathSSE::sqrt(), and theta().

Referenced by CTPPSFastTrackingProducer::FastReco().

                                                                                                          {
  t = 0.;
  xi = -1.;
  if (!proton)
    return;
  double mom =
      sqrt((proton->Px()) * (proton->Px()) + (proton->Py()) * (proton->Py()) + (proton->Pz()) * (proton->Pz()));
  if (mom > bi.fBeamMomentum)
    mom = bi.fBeamMomentum;
  double energy = proton->E();
  double theta = (proton->Pz() > 0) ? proton->Theta() : TMath::Pi() - proton->Theta();
  t = -2. * (ProtonMassSQ - bi.fBeamEnergy * energy + bi.fBeamMomentum * mom * cos(theta));
  xi = (1.0 - energy / bi.fBeamEnergy);
}

TLorentzVector PPSTools::HectorParticle2LorentzVector	(	H_BeamParticle	hp,
		int	direction
	)

Definition at line 6 of file PPSUtilities.cc.

References funct::cos(), funct::pow(), ProtonMassSQ, mathSSE::sqrt(), funct::tan(), theta(), and urad.

                                                                                      {
  double partP = sqrt(pow(hp.getE(), 2) - ProtonMassSQ);
  double theta = sqrt(pow(hp.getTX(), 2) + pow(hp.getTY(), 2)) * urad;
  double pz = partP * cos(theta);
  double px = tan((double)hp.getTX() * urad) * pz;  //it is equivalente to PartP*sin(theta)*cos(phi);
  double py = tan((double)hp.getTY() * urad) * pz;  //it is equivalente to partP*sin(theta)*sin(phi);
  pz *= direction;
  return TLorentzVector(px, py, pz, hp.getE());
}

void PPSTools::LorentzBoost	(	H_BeamParticle &	h_p,
		int	dir,
		const std::string &	frame,
		FullBeamInfo const &	bi
	)

Referenced by CTPPSFastTrackingProducer::FastReco().

void PPSTools::LorentzBoost	(	TLorentzVector &	p_out,
		const std::string &	frame,
		FullBeamInfo const &	bi
	)

void PPSTools::LorentzBoost	(	HepMC::GenParticle &	p_out,
		const std::string &	frame,
		FullBeamInfo const &	bi
	)

H_BeamParticle PPSTools::LorentzVector2HectorParticle

(

TLorentzVector

p

)

Definition at line 16 of file PPSUtilities.cc.

References funct::abs().

                                                                      {
  H_BeamParticle h_p;
  h_p.set4Momentum(p.Px(), p.Py(), abs(p.Pz()), p.E());
  return h_p;
}

Variable Documentation

const double PPSTools::ProtonMass = CLHEP::proton_mass_c2 / GeV

Definition at line 30 of file PPSUtilities.h.

const double PPSTools::ProtonMassSQ = pow(ProtonMass, 2)

Definition at line 31 of file PPSUtilities.h.

Referenced by CTPPSFastTrackingProducer::CTPPSFastTrackingProducer(), CTPPSFastTrackingProducer::FastReco(), and CTPPSFastTrackingProducer::SearchTrack().

const double PPSTools::urad = 1. / 1000000.

Definition at line 29 of file PPSUtilities.h.