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File indexing completed on 2021-02-14 13:29:56

0001 // -*- C++ -*-
0002 //
0003 // Package:    DJpsiFilter
0004 // Class:      DJpsiFilter
0005 //
0006 /**\class DJpsiFilter DJpsiFilter.cc psi2s1s/DJpsiFilter/src/DJpsiFilter.cc
0007 
0008  Description: [one line class summary]
0009 
0010  Implementation:
0011      [Notes on implementation]
0012 */
0013 //
0014 // Original Author:  bian jianguo
0015 //         Created:  Tue Nov 22 20:39:54 CST 2011
0016 //
0017 //
0018 
0019 #include "DataFormats/Common/interface/Handle.h"
0020 #include "FWCore/Framework/interface/Event.h"
0021 #include "FWCore/Framework/interface/Frameworkfwd.h"
0022 #include "FWCore/Framework/interface/global/EDFilter.h"
0023 #include "FWCore/Framework/interface/MakerMacros.h"
0024 #include "FWCore/ParameterSet/interface/ConfigurationDescriptions.h"
0025 #include "FWCore/ParameterSet/interface/ParameterSet.h"
0026 #include "FWCore/ParameterSet/interface/ParameterSetDescription.h"
0027 #include "FWCore/Utilities/interface/EDGetToken.h"
0028 #include "FWCore/Utilities/interface/InputTag.h"
0029 #include "SimDataFormats/GeneratorProducts/interface/HepMCProduct.h"
0030 
0031 #include <cmath>
0032 #include <cstdlib>
0033 #include <string>
0034 
0035 class DJpsiFilter : public edm::global::EDFilter<> {
0036 public:
0037   explicit DJpsiFilter(const edm::ParameterSet&);
0038 
0039   static void fillDescriptions(edm::ConfigurationDescriptions&);
0040 
0041 private:
0042   bool filter(edm::StreamID, edm::Event&, const edm::EventSetup&) const override;
0043 
0044   const edm::EDGetTokenT<edm::HepMCProduct> token_;
0045   const double minPt;
0046   const double maxY;
0047   const double maxPt;
0048   const double minY;
0049   const int status;
0050   const int particleID;
0051 };
0052 
0053 DJpsiFilter::DJpsiFilter(const edm::ParameterSet& iConfig)
0054     : token_(consumes<edm::HepMCProduct>(
0055           edm::InputTag(iConfig.getUntrackedParameter("moduleLabel", std::string("generator")), "unsmeared"))),
0056       minPt(iConfig.getUntrackedParameter("MinPt", 0.)),
0057       maxY(iConfig.getUntrackedParameter("MaxY", 10.)),
0058       maxPt(iConfig.getUntrackedParameter("MaxPt", 1000.)),
0059       minY(iConfig.getUntrackedParameter("MinY", 0.)),
0060       status(iConfig.getUntrackedParameter("Status", 0)),
0061       particleID(iConfig.getUntrackedParameter("ParticleID", 0)) {}
0062 
0063 bool DJpsiFilter::filter(edm::StreamID, edm::Event& iEvent, const edm::EventSetup&) const {
0064   bool accepted = false;
0065   int n2jpsi = 0;
0066   edm::Handle<edm::HepMCProduct> evt;
0067   iEvent.getByToken(token_, evt);
0068   const HepMC::GenEvent* myGenEvent = evt->GetEvent();
0069 
0070   for (HepMC::GenEvent::particle_const_iterator p = myGenEvent->particles_begin(); p != myGenEvent->particles_end();
0071        ++p) {
0072     if ((*p)->status() != status)
0073       continue;
0074     double energy = (*p)->momentum().e();
0075     double pz = (*p)->momentum().pz();
0076     double momentumY = 0.5 * std::log((energy + pz) / (energy - pz));
0077     if ((*p)->momentum().perp() > minPt && std::fabs(momentumY) < maxY && (*p)->momentum().perp() < maxPt &&
0078         std::fabs(momentumY) > minY) {
0079       if (std::abs((*p)->pdg_id()) == particleID)
0080         n2jpsi++;
0081     }
0082     if (n2jpsi >= 2) {
0083       accepted = true;
0084       break;
0085     }
0086   }
0087   return accepted;
0088 }
0089 
0090 // ------------ method fills 'descriptions' with the allowed parameters for the module  ------------
0091 void DJpsiFilter::fillDescriptions(edm::ConfigurationDescriptions& descriptions) {
0092   //The following says we do not know what parameters are allowed so do no validation
0093   // Please change this to state exactly what you do use, even if it is no parameters
0094   edm::ParameterSetDescription desc;
0095   desc.setUnknown();
0096   descriptions.addDefault(desc);
0097 }
0098 //define this as a plug-in
0099 DEFINE_FWK_MODULE(DJpsiFilter);