DisplacedJetBeamspotInfo.h

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/*
Copyright (C) 2002-2022 CERN for the benefit of the ATLAS collaboration
*/
#ifndef TRIGT2DJTRIG_BEAMSPOT_H
#define TRIGT2DJTRIG_BEAMSPOT_H
 
#include "BeamSpotConditionsData/BeamSpotData.h"
 
//keep all code for handling the beamspot info in the displaced jet trigger in one place
//Two tools under different hypo algs use this info so better to only write once
class DisplacedJetBeamspotInfo
{
public:
  DisplacedJetBeamspotInfo(const InDet::BeamSpotData* beamspot = nullptr): m_bs_data(beamspot) {}
 
  //m_errPar { sigmaX, sigmaY, sigmaZ, tiltX, tiltY, sigmaXY }, so sigma x = 0 sigma y = 1 sigma xy has a helper
  float sigmaX(){
    if(!is_available()){
      return 0.0;
    }
 
    return m_bs_data->beamSigma(0);
  }
 
  float sigmaY(){
    if(!is_available()){
      return 0.0;
    }
 
    return m_bs_data->beamSigma(1);
  }
 
  float sigmaXY(){
    if(!is_available()){
      return 0.0;
    }
 
    return m_bs_data->beamSigmaXY();
  }
 
private:
  const InDet::BeamSpotData* m_bs_data;
 
  bool is_available(){
    if(m_bs_data == nullptr){
      return false;
    }
 
    //check if the beamspot info is valid and should be used
    //info from https://twiki.cern.ch/twiki/bin/view/Atlas/CoolBeamSpotParameters
    int beamSpotBitMap = m_bs_data->beamStatus();
    bool isOnlineBeamspot = ((beamSpotBitMap & 0x4) == 0x4);
 
    //offline/mc -> assume to be valid
    if(!isOnlineBeamspot){
      return true;
    }
 
    //check if the beamspot has converged
    if((beamSpotBitMap&0x3) == 0x3){
      //beamspot has converged
      return true;
    }
 
    return false;
  }
};
 
  #endif //> !TRIGT2MINBIAS_TRACKCOUNTHYPOTOOL_H