HitGapSegmentPairVarSet.cc

/**************************************************************************
 * basf2 (Belle II Analysis Software Framework)                           *
 * Author: The Belle II Collaboration                                     *
 *                                                                        *
 * See git log for contributors and copyright holders.                    *
 * This file is licensed under LGPL-3.0, see LICENSE.md.                  *
 **************************************************************************/
#include <tracking/trackFindingCDC/filters/segmentPair/HitGapSegmentPairVarSet.h>
 
#include <tracking/trackingUtilities/eventdata/tracks/CDCSegmentPair.h>
#include <tracking/trackingUtilities/eventdata/segments/CDCSegment2D.h>
 
#include <cdc/topology/CDCWire.h>
 
#include <tracking/trackingUtilities/numerics/Angle.h>
 
using namespace Belle2;
using namespace CDC;
using namespace TrackFindingCDC;
using namespace TrackingUtilities;
 
bool HitGapSegmentPairVarSet::extract(const CDCSegmentPair* ptrSegmentPair)
{
  if (not ptrSegmentPair) return false;
 
  const CDCSegmentPair& segmentPair = *ptrSegmentPair;
 
  const CDCSegment2D* ptrFromSegment = segmentPair.getFromSegment();
  const CDCSegment2D* ptrToSegment = segmentPair.getToSegment();
 
  const CDCSegment2D& fromSegment = *ptrFromSegment;
  const CDCSegment2D& toSegment = *ptrToSegment;
 
  const CDCRecoHit2D& fromFirstHit = fromSegment.front();
  const CDCRecoHit2D& fromLastHit = fromSegment.back();
 
  const CDCRecoHit2D& toFirstHit = toSegment.front();
  const CDCRecoHit2D& toLastHit = toSegment.back();
 
  const Vector2D fromLastHitPos = fromLastHit.getRecoPos2D();
  const Vector2D fromFirstHitPos = fromFirstHit.getRecoPos2D();
 
  const Vector2D toFirstHitPos = toFirstHit.getRecoPos2D();
  const Vector2D toLastHitPos = toLastHit.getRecoPos2D();
 
  const Vector2D hitPosGap = toFirstHitPos - fromLastHitPos;
  const Vector2D longHitPosGap = toLastHitPos - fromFirstHitPos;
 
  const double hitDistance = hitPosGap.norm();
  const double longHitDistance = longHitPosGap.norm();
 
  const Vector2D fromLastHitMom = fromLastHit.getFlightDirection2D();
  const Vector2D toFirstHitMom = toFirstHit.getFlightDirection2D();
 
  finitevar<named("delta_hit_pos_phi")>() = fromLastHitPos.angleWith(toFirstHitPos);
  finitevar<named("delta_hit_mom_phi")>() = fromLastHitMom.angleWith(toFirstHitMom);
 
  double fromLastHitAlpha = fromLastHit.getAlpha();
  double toFirstHitAlpha = toFirstHit.getAlpha();
  finitevar<named("delta_hit_alpha")>() = AngleUtil::normalised(toFirstHitAlpha - fromLastHitAlpha);
 
  finitevar<named("hit_distance")>() = hitDistance;
  finitevar<named("hit_long_distance")>() = longHitDistance;
 
  finitevar<named("delta_hit_distance")>() = longHitDistance - hitDistance;
 
  finitevar<named("from_hit_forward")>() = hitPosGap.dot(fromLastHitMom);
  finitevar<named("to_hit_forward")>() = hitPosGap.dot(toFirstHitMom);
  finitevar<named("hit_forward")>() = hitPosGap.dot(Vector2D::average(fromLastHitMom, toFirstHitMom));
 
  const CDCRecoHit2D& axialHit = toFirstHit.isAxial() ? toFirstHit : fromLastHit;
  const CDCRecoHit2D& stereoHit = not toFirstHit.isAxial() ? toFirstHit : fromLastHit;
 
  const Vector2D axialHitPos = axialHit.getRecoPos2D();
  const Vector2D axialHitMom = axialHit.getFlightDirection2D();
 
  const CDCWire& stereoWire = stereoHit.getWire();
  const WireLine& wireLine = stereoWire.getWireLine();
 
  // Calculate point were the wire is first method
  Vector2D relRefPos = wireLine.refPos2D() - axialHitPos;
  Vector2D movePerZ = wireLine.nominalMovePerZ();
 
  double z = -relRefPos.cross(axialHitMom) / movePerZ.cross(axialHitMom);
  Vector2D stereoHitPos = stereoHit.getRecoPos2D() + movePerZ * z;
 
  finitevar<named("hit_reco_z")>() = z;
  finitevar<named("hit_z_bound_factor")>() = wireLine.outOfZBoundsFactor(z);
  double arcLengthGap = (stereoHitPos - axialHitPos).dot(axialHitMom);
  finitevar<named("hit_arclength_gap")>() = toFirstHit.isAxial() ? -arcLengthGap : arcLengthGap;
 
  // const Vector2D fromStretch = fromLastHitPos - fromFirstHitPos;
  // const Vector2D toStretch = toLastHitPos - toFirstHitPos;
 
  // const double fromLength = fromStretch.norm();
  // const double toLength = toStretch.norm();
 
  // const Vector2D firstPosGap = toFirstHitPos - fromFirstHitPos;
  // const Vector2D lastPosGap = toLastHitPos - fromLastHitPos;
 
  // const double firstOffset = firstPosGap.norm();
  // const double lastOffset = lastPosGap.norm();
 
  // finitevar<named("hit_ptolemy")>() =
  //   firstOffset * lastOffset - longHitDistance * hitDistance - fromLength * toLength;
 
  return true;
}