/*
$Log$
+Revision 1.3 2000/06/25 13:06:39 hristov
+Inline functions moved from *.cxx to *.h files instead of forward declarations
+
Revision 1.2 2000/06/15 07:58:48 morsch
Code from MUON-dev joined
}
//__________________________________________________________________________
-void AliMUONSegment::UpdateFromStationTrackParam(AliMUONTrackParam *TrackParam, Double_t MCSfactor, Double_t Dz1, Double_t Dz2)
+void AliMUONSegment::UpdateFromStationTrackParam(AliMUONTrackParam *TrackParam, Double_t MCSfactor, Double_t Dz1, Double_t Dz2, Double_t Dz3, Int_t Station, Double_t InverseMomentum)
{
// Fill data members with values calculated from the array of track parameters
// pointed to by "TrackParam" (index = 0 and 1 for first and second chambers
// with one chamber for the coordinate, two chambers for the angle,
// due to the arrangement in stations.
// Resolution coming from:
- // coordinate in closest station at "Dz1",
+ // coordinate in closest station at "Dz1" from current "Station",
// slope between closest stations, with "Dz2" interval between them,
- // extrapolation over "Dz" from closest station.
+ // interval "Dz3" between chambers of closest station,
+ // extrapolation over "Dz1" from closest station,
+ // "InverseMomentum".
// When called, "fBendingCoorReso2" and "fNonBendingCoorReso2"
// are assumed to be filled
// with the variance on bending and non bending coordinates.
+ // The "road" is parametrized from the old reco_muon.F
+ // with 8 cm between stations.
AliMUONTrackParam *param0;
Double_t cReso2, sReso2;
+ // parameters to define the widths of the searching roads in station 0,1,2
+ // width = p0 + p1/ (momentum)^2
+ // station number: 0 1 2
+ static Double_t p0BendingCoor[3] = { 6.43e-2, 1.64e-2, 0.034 };
+ static Double_t p1BendingCoor[3] = { 986., 821., 446. };
+ static Double_t p0BendingSlope[3] = { 3.54e-6, 3.63e-6, 3.6e-6 };
+ static Double_t p1BendingSlope[3] = { 4.49e-3, 4.8e-3, 0.011 };
+ static Double_t p0NonBendingCoor[3] = { 4.66e-2, 4.83e-2, 0.049 };
+ static Double_t p1NonBendingCoor[3] = { 1444., 866., 354. };
+ static Double_t p0NonBendingSlope[3] = { 6.14e-4, 6.49e-4, 6.85e-4 };
+ static Double_t p1NonBendingSlope[3] = { 0., 0., 0. };
param0 = &(TrackParam[0]);
+
+// OLD version
+// // Bending plane
+// fBendingCoor = param0->GetBendingCoor(); // coordinate
+// fBendingSlope = param0->GetBendingSlope(); // slope
+// cReso2 = fBendingCoorReso2;
+// sReso2 = 2.0 * cReso2 / Dz2 / Dz2;
+// fBendingCoorReso2 = cReso2 + (sReso2 + MCSfactor) * Dz1 * Dz1;
+// fBendingSlopeReso2 = sReso2 + 2.0 * MCSfactor;
+// // Non bending plane
+// fNonBendingCoor = param0->GetNonBendingCoor(); // coordinate
+// fNonBendingSlope = param0->GetNonBendingSlope(); // slope
+// cReso2 = fNonBendingCoorReso2;
+// sReso2 = 2.0 * cReso2 / Dz2 / Dz2;
+// fNonBendingCoorReso2 = cReso2 + (sReso2 + MCSfactor) * Dz1 * Dz1;
+// fNonBendingSlopeReso2 = sReso2 + 2.0 * MCSfactor;
+
+ // Coordinate and slope
// Bending plane
fBendingCoor = param0->GetBendingCoor(); // coordinate
fBendingSlope = param0->GetBendingSlope(); // slope
- cReso2 = fBendingCoorReso2;
- sReso2 = 2.0 * cReso2 / Dz2 / Dz2;
- fBendingCoorReso2 = cReso2 + (sReso2 + MCSfactor) * Dz1 * Dz1;
- fBendingSlopeReso2 = sReso2 + 2.0 * MCSfactor;
// Non bending plane
fNonBendingCoor = param0->GetNonBendingCoor(); // coordinate
fNonBendingSlope = param0->GetNonBendingSlope(); // slope
+
+ // Resolutions
+ // cReso2 and sReso2 have to be subtracted here from the parametrization
+ // because they are added in the functions "NormalizedChi2WithSegment"
+ // and "NormalizedChi2WithHitForRec"
+ // Bending plane
+ cReso2 = fBendingCoorReso2;
+ sReso2 = (2. * cReso2 )/ (Dz3*Dz3) ;
+ fBendingCoorReso2 = p0BendingCoor[Station] + p1BendingCoor[Station]*InverseMomentum*InverseMomentum - cReso2;
+ fBendingSlopeReso2 = p0BendingSlope[Station] + p1BendingSlope[Station]*InverseMomentum*InverseMomentum - sReso2;
+ // Non bending plane
cReso2 = fNonBendingCoorReso2;
- sReso2 = 2.0 * cReso2 / Dz2 / Dz2;
- fNonBendingCoorReso2 = cReso2 + (sReso2 + MCSfactor) * Dz1 * Dz1;
- fNonBendingSlopeReso2 = sReso2 + 2.0 * MCSfactor;
+ sReso2 = (2. * cReso2 )/ (Dz3*Dz3) ;
+ fNonBendingCoorReso2 = p0NonBendingCoor[Station] + p1NonBendingCoor[Station]*InverseMomentum*InverseMomentum - cReso2;
+ fNonBendingSlopeReso2 = p0NonBendingSlope[Station] + p1NonBendingSlope[Station]*InverseMomentum*InverseMomentum - sReso2;
return;
}
+
+// OLD function, with roads automatically calculated instead from being parametrized
+// kept because it would be a better solution,
+// if one can really find the right values.
+// //__________________________________________________________________________
+// void AliMUONSegment::UpdateFromStationTrackParam(AliMUONTrackParam *TrackParam, Double_t MCSfactor, Double_t Dz1, Double_t Dz2)
+// {
+// // Fill data members with values calculated from the array of track parameters
+// // pointed to by "TrackParam" (index = 0 and 1 for first and second chambers
+// // of the station, respectively).
+// // Multiple Coulomb scattering is taking into account with "MCSfactor"
+// // corresponding to one chamber,
+// // with one chamber for the coordinate, two chambers for the angle,
+// // due to the arrangement in stations.
+// // Resolution coming from:
+// // coordinate in closest station at "Dz1",
+// // slope between closest stations, with "Dz2" interval between them,
+// // extrapolation over "Dz" from closest station.
+// // When called, "fBendingCoorReso2" and "fNonBendingCoorReso2"
+// // are assumed to be filled
+// // with the variance on bending and non bending coordinates.
+// AliMUONTrackParam *param0;
+// Double_t cReso2, sReso2;
+// param0 = &(TrackParam[0]);
+// // Bending plane
+// fBendingCoor = param0->GetBendingCoor(); // coordinate
+// fBendingSlope = param0->GetBendingSlope(); // slope
+// cReso2 = fBendingCoorReso2;
+// sReso2 = 2.0 * cReso2 / Dz2 / Dz2;
+// fBendingCoorReso2 = cReso2 + (sReso2 + MCSfactor) * Dz1 * Dz1;
+// fBendingSlopeReso2 = sReso2 + 2.0 * MCSfactor;
+// // Non bending plane
+// fNonBendingCoor = param0->GetNonBendingCoor(); // coordinate
+// fNonBendingSlope = param0->GetNonBendingSlope(); // slope
+// cReso2 = fNonBendingCoorReso2;
+// sReso2 = 2.0 * cReso2 / Dz2 / Dz2;
+// fNonBendingCoorReso2 = cReso2 + (sReso2 + MCSfactor) * Dz1 * Dz1;
+// fNonBendingSlopeReso2 = sReso2 + 2.0 * MCSfactor;
+// return;
+// }
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff