SiStripClusterTools.h

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#ifndef DataFormatsSiStripClusterSiStripClusterTools_H
#define DataFormatsSiStripClusterSiStripClusterTools_H

#include "DataFormats/TrajectoryState/interface/LocalTrajectoryParameters.h"
#include "DataFormats/SiStripDetId/interface/SiStripDetId.h"

#include <numeric>

namespace siStripClusterTools {

  // to be moved and optimized in TrackerCommon when TrackerTopology will support moduleGeometry
  inline float sensorThicknessInverse(DetId detid) {
    if (detid.subdetId() >= SiStripDetId::TIB) {
      SiStripDetId siStripDetId = detid();
      if (siStripDetId.subdetId() == SiStripDetId::TOB)
        return 1.f / 0.047f;
      if (siStripDetId.moduleGeometry() == SiStripModuleGeometry::W5 ||
          siStripDetId.moduleGeometry() == SiStripModuleGeometry::W6 ||
          siStripDetId.moduleGeometry() == SiStripModuleGeometry::W7)
        return 1.f / 0.047f;
      return 1.f / 0.029f;  // so it is TEC ring 1-4 or TIB or TOB;
    } else if (detid.subdetId() == 1)
      return 1.f / 0.0285f;
    else
      return 1.f / 0.027f;
  }

  template <typename Iter>
  inline float chargePerCM(DetId detid, Iter a, Iter b) {
    return float(std::accumulate(a, b, int(0))) * sensorThicknessInverse(detid);
  }

  template <typename Clus>
  inline float chargePerCM(DetId detid, Clus const& cl) {
    return cl.charge() * sensorThicknessInverse(detid);
  }

  template <typename Clus>
  inline float chargePerCM(DetId detid, Clus const& cl, LocalTrajectoryParameters const& tp) {
    return chargePerCM(detid, cl) * tp.absdz();
  }

  template <typename Clus>
  inline float chargePerCM(Clus const& cl, LocalTrajectoryParameters const& tp, float invThick) {
    return cl.charge() * invThick * tp.absdz();
  }

  template <typename Clus>
  inline float chargePerCM(DetId detid, Clus const& cl, const LocalVector& ldir) {
    return chargePerCM(detid, cl) * std::abs(ldir.z()) / ldir.mag();
  }

}  // namespace siStripClusterTools

#endif  // DataFormatsSiStripClusterSiStripClusterTools_H