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Correct pps sim vtx position #34556

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Jul 21, 2021
Merged

Correct pps sim vtx position #34556

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b48fa4e
Correct the final sim vertex position inside PPS region
mundim Jul 19, 2021
f69cb88
modification by scram b code-format
mundim Jul 19, 2021
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4 changes: 2 additions & 2 deletions SimTransport/PPSProtonTransport/python/CommonParameters_cfi.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@
Verbosity = cms.bool(False),
EtaCut = cms.double(8.2),
MomentumCut= cms.double(3000),
PPSRegionStart_45 = cms.double(212.45),
PPSRegionStart_56 = cms.double(212.45)
PPSRegionStart_45 = cms.double(203),
PPSRegionStart_56 = cms.double(203)
)

5 changes: 5 additions & 0 deletions SimTransport/PPSProtonTransport/src/OpticalFunctionsTransport.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -172,6 +172,11 @@ bool OpticalFunctionsTransport::transportProton(const HepMC::GenParticle* in_trk
<< " proton transported: a_x = " << a_x << " rad, a_y = " << a_y << " rad, b_x = " << b_x
<< " mm, b_y = " << b_y << " mm, z = " << z_scoringPlane << " mm" << std::endl;
}
//
// Project the track back to the starting of PPS region
b_x -= (abs(z_scoringPlane) - (double)((z_scoringPlane < 0) ? fPPSRegionStart_45 : fPPSRegionStart_56) * 1e3) *
a_x; // z_scoringPlane is in mm
b_y -= (abs(z_scoringPlane) - (double)((z_scoringPlane < 0) ? fPPSRegionStart_45 : fPPSRegionStart_56) * 1e3) * a_y;

unsigned int line = in_trk->barcode();
double px = -p * a_x;
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