FPGATrackSimBinUtil::GeomHelpers Class Reference

#include <FPGATrackSimBinUtil.h>

Collaboration diagram for FPGATrackSimBinUtil::GeomHelpers:

Static Public Member Functions
static double	ThetaFromEta (double eta)
static double	EtaFromTheta (double theta)
static double	zFromPars (double r, const FPGATrackSimTrackPars &pars)
static double	phiFromPars (double r, const FPGATrackSimTrackPars &pars)
static double	parsToTrkPhi (const FPGATrackSimTrackPars &pars, FPGATrackSimHit const *hit)
static double	dPhiHitTrkFromPars (double r, const FPGATrackSimTrackPars &pars)
static double	dZdEta (double eta)
static double	dPhidQOverPt (double hitr)

Static Public Attributes
static constexpr double	CurvatureConstant = fpgatracksim::A

Detailed Description

Definition at line 118 of file FPGATrackSimBinUtil.h.

Member Function Documentation

dPhidQOverPt()

double FPGATrackSimBinUtil::GeomHelpers::dPhidQOverPt ( double  hitr )

static

Definition at line 185 of file FPGATrackSimBinUtil.cxx.

{
  // full answer = rA/cos(dphi)
  // approx answer = rA  b/c  dphi is small (~0.4 max)
  return hitr*CurvatureConstant;
}

dPhiHitTrkFromPars()

double FPGATrackSimBinUtil::GeomHelpers::dPhiHitTrkFromPars ( double  r, const FPGATrackSimTrackPars &  pars  )

static

Definition at line 162 of file FPGATrackSimBinUtil.cxx.

                                                                                  {
    return asin(r * CurvatureConstant * pars.qOverPt - pars.d0 / r);
}

dZdEta()

double FPGATrackSimBinUtil::GeomHelpers::dZdEta ( double  eta )

static

Definition at line 179 of file FPGATrackSimBinUtil.cxx.

{
  // dtheta/deta = -sin(theta)
  return -1.0/std::sin(ThetaFromEta(eta));
}

EtaFromTheta()

double FPGATrackSimBinUtil::GeomHelpers::EtaFromTheta ( double  theta )

static

Definition at line 143 of file FPGATrackSimBinUtil.cxx.

{
    return -log(tan(theta / 2.0));
}

parsToTrkPhi()

double FPGATrackSimBinUtil::GeomHelpers::parsToTrkPhi ( const FPGATrackSimTrackPars &  pars, FPGATrackSimHit const *  hit  )

static

Definition at line 171 of file FPGATrackSimBinUtil.cxx.

{
    double r = hit->getR();          // mm
    double phi_hit = hit->getGPhi(); // radians
    double phi_trk = xAOD::P4Helpers::deltaPhi(phi_hit,dPhiHitTrkFromPars(r,pars));
    return phi_trk;
}

phiFromPars()

double FPGATrackSimBinUtil::GeomHelpers::phiFromPars ( double  r, const FPGATrackSimTrackPars &  pars  )

static

Definition at line 166 of file FPGATrackSimBinUtil.cxx.

                                                                           {
    double phi_hit = xAOD::P4Helpers::deltaPhi(pars.phi,dPhiHitTrkFromPars(r,pars));
    return phi_hit;
}

ThetaFromEta()

double FPGATrackSimBinUtil::GeomHelpers::ThetaFromEta ( double  eta )

static

Definition at line 138 of file FPGATrackSimBinUtil.cxx.

{
    return 2.0 * atan(exp(-1.0 * eta));
}

zFromPars()

double FPGATrackSimBinUtil::GeomHelpers::zFromPars ( double  r, const FPGATrackSimTrackPars &  pars  )

static

Definition at line 151 of file FPGATrackSimBinUtil.cxx.

{
    double theta = ThetaFromEta(pars.eta);
    double zhit = pars.z0 + r / tan(theta);
    if (std::abs(pars.qOverPt) > 0)
    {
        zhit = pars.z0 + 1.0 / tan(theta) * asin(r * CurvatureConstant * pars.qOverPt) / (CurvatureConstant * pars.qOverPt);
    }
    return zhit;
}

Member Data Documentation

CurvatureConstant

constexpr double FPGATrackSimBinUtil::GeomHelpers::CurvatureConstant = fpgatracksim::A

staticconstexpr

Definition at line 122 of file FPGATrackSimBinUtil.h.

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The documentation for this class was generated from the following files:

• FPGATrackSimBinUtil.h
• FPGATrackSimBinUtil.cxx