Difference: LowPtSoftware (13 vs. 14)

CMSSW Software

Low p_T tracking

• RecoTracker/TkTrackingRegions
  GlobalTrackingRegion.h is modified to lower ptMin
  

  GlobalTrackingRegion ( float ptMin = 0.075, float originRadius = 0.2,

• RecoPixelVertexing/PixelTriplets
• RecoPixelVertexing/PixelLowPtUtilities
• RecoPixelVertexing/PixelTrackFitting
  PixelFitterByHelixProjections.{cc,h} is modified for correct calculation of cotθ
  

float PixelFitterByHelixProjections::cotTheta
  (const vector<GlobalPoint> & points,
   float radius, float phi, float d0, float& zip) const
...
   float chi = phi - M_PI_2;
   GlobalPoint IP(d0*cos(chi), d0*sin(chi),zip);

   float phi1 = 2*asin(0.5*(gp1 - IP).perp()/radius);
   float phi2 = 2*asin(0.5*(gp2 - IP).perp()/radius);

   float dr = radius*(phi2 - phi1);
   float dz = gp2.z()-gp1.z();

   // Recalculate ZIP
   zip = (gp1.z()*phi2 - gp2.z()*phi1)/(phi2 - phi1);

V0

• DataFormats/VZero
• RecoVZero/VZeroFinding

dE/dx

• RecoPixelVertexing/PixelLowPtUtilities

Association

• SimTracker/TrackerHitAssociation
  get from cvs
• SimTracker/TrackAssociation
  get from cvs