StPicoEpdHit.cxx

// PicoDst headers
#include "StPicoMessMgr.h"
#include "StPicoEpdHit.h"

//
// \class StPicoEpdHit
// \author Mike Lisa
// \date 06 March 2018
// \brief Holds signals for tiles in STAR Event Plane Detector

/*************************************************
 * Hit Class for the STAR Event Plane Detector.
 * There is one "hit" for each (good) tile in the detector
 * 
 * Total size of this object is 10 bytes
 * This object contains only
 *  1) the id of the tile, compacted into a Short_t
 *  2) the QT information (ADC, TDC, TAC, hasTac flag, status flag)
 *     compacted into 32 bits (Int_t
 *  3) the gain-corrected energy loss, in units of the
 *     most probable value (MPV) of a single MIP in the tile,
 *     according to a Landau distribution.  Stored as Float_t
 *
 * The StPicoEpdHit in the StMuDST is basically the same as
 *  the StMuEpdHit object in the muDst and
 *  the StEpdHit object in StEvent
 * Except 
 *   1) it does not inherit from StObject, so can be used in "vanilla root"
 *   2) there is no "Truth ID" which is used for simulations.
 * 
 * - Mike Lisa March 2018
 ************************************************/

ClassImp(StPicoEpdHit)

//_________________
StPicoEpdHit::StPicoEpdHit() : TObject(), mId(0), mQTdata(0), mnMIP(0) {
  /* no-op */
}

//_________________
StPicoEpdHit::StPicoEpdHit(Int_t position, Int_t tile,
                           Int_t EW, Int_t ADC, Int_t TAC,
                           Int_t TDC, Bool_t hasTAC, Float_t nMIP,
                           Bool_t statusIsGood) :
  TObject(),
  mId( (100*position + tile)*EW ),
  mQTdata( (ADC & 0x0FFF) | (TAC & 0x0FFF) << 12 | (TDC & 0x001F) << 24 | hasTAC << 29 | statusIsGood << 30 ),
  mnMIP(nMIP) {
  /* no-op */
}

//_________________
StPicoEpdHit::StPicoEpdHit(Short_t id, Int_t QTdata, Float_t nMIP) :
  TObject(), mId(id), mQTdata(QTdata), mnMIP(nMIP) {
  /* no-op */
}

//_________________
StPicoEpdHit::StPicoEpdHit(const StPicoEpdHit &hit) : TObject() {
  mId = hit.mId;
  mQTdata = hit.mQTdata;
  mnMIP = hit.mnMIP;
}

//_________________
StPicoEpdHit::~StPicoEpdHit() {
  /* no-op */
}

//_________________
void StPicoEpdHit::Print(const Char_t *option __attribute__((unused)) ) const {
  LOG_INFO << "EPD hit id: " << mId << " QT data: " << mQTdata << " nMIP: " << mnMIP << endm;
}