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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/FastJets.hh"
#include "Rivet/Projections/ZFinder.hh"
namespace Rivet {
/// Dimuon production in proton-copper collisions at 38.8 GeV
class E605_1991_I302822 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(E605_1991_I302822);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
const FinalState fs;
declare(fs, "FS");
Cut cut = Cuts::etaIn(-10.,10.);
ZFinder zfinder(fs, cut, PID::MUON, 4.0*GeV, 100.0*GeV, 0.1, ZFinder::ClusterPhotons::NONE );
declare(zfinder, "ZFinder");
// Book histograms in mass ranges (measurement is not normalised to mass range)
Histo1DPtr dummy;
book(_hist_pT_M_78,17, 1, 1);
book(_hist_pT_M_89,18, 1, 1);
book(_hist_pT_M_1011,19, 1, 1);
book(_hist_pT_M_1113,20, 1, 1);
book(_hist_pT_M_1318,21, 1, 1);
int Nbin = 50;
book(_h_m_DiMuon,"DiMuon_mass",Nbin,0.0,30.0);
book(_h_pT_DiMuon,"DiMuon_pT",Nbin,0.0,20.0);
book(_h_y_DiMuon,"DiMuon_y",Nbin,-8.0, 8.0);
book(_h_xF_DiMuon,"DiMuon_xF",Nbin, -1.5, 1.5);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
const double sqrts_tol = 10. ;
if (!isCompatibleWithSqrtS(38.8, sqrts_tol)) {
MSG_ERROR("Incorrect beam energy used: " << sqrtS()/GeV);
throw Error("Unexpected sqrtS ! Only 38.8 GeV is supported");
}
const ZFinder& zfinder = applyProjection<ZFinder>(event, "ZFinder");
if (zfinder.particles().size() >= 1) {
double Zmass = zfinder.bosons()[0].momentum().mass()/GeV;
double Zpt = zfinder.bosons()[0].momentum().pT()/GeV;
double Zpl = zfinder.bosons()[0].momentum().pz()/GeV;
double Zy = zfinder.bosons()[0].momentum().rapidity();
double ZE = zfinder.bosons()[0].momentum().E();
double xf = 2.*Zpl/sqrtS();
_h_xF_DiMuon->fill(xf);
_h_m_DiMuon->fill(Zmass/GeV);
_h_pT_DiMuon->fill(Zpt);
_h_y_DiMuon ->fill(Zy);
if (xf > -0.1 && xf < 0.2 && Zpt > 0) {
if (Zmass > 7. && Zmass < 8.) _hist_pT_M_78->fill(Zpt, 1./2./Zpt *2.*ZE/sqrtS());
if (Zmass > 8. && Zmass < 9.) _hist_pT_M_89->fill(Zpt, 1./2./Zpt *2.*ZE/sqrtS());
if (Zmass > 10.5 && Zmass < 11.5) _hist_pT_M_1011->fill(Zpt, 1./2./Zpt *2.*ZE/sqrtS());
if (Zmass > 11.5 && Zmass < 13.5) _hist_pT_M_1113->fill(Zpt, 1./2./Zpt *2.*ZE/sqrtS());
if (Zmass > 13.5 && Zmass < 18.) _hist_pT_M_1318->fill(Zpt, 1./2./Zpt *2.*ZE/sqrtS());
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
MSG_DEBUG(" Generator cross section [pb] " << crossSection()/picobarn);
normalize(_h_m_DiMuon);
normalize(_h_pT_DiMuon);
normalize(_h_xF_DiMuon);
normalize(_h_y_DiMuon);
// normalisation of xF bin width = 0.3
const double scalefactor=crossSection()/picobarn/(sumOfWeights() * M_PI *0.3 );
scale(_hist_pT_M_78,scalefactor);
scale(_hist_pT_M_89,scalefactor);
scale(_hist_pT_M_1011,scalefactor);
scale(_hist_pT_M_1113,scalefactor);
scale(_hist_pT_M_1318,scalefactor);
}
//@}
/// @name Histograms
//@{
BinnedHistogram _hist_pT_M;
Histo1DPtr _h_m_DiMuon ;
Histo1DPtr _h_pT_DiMuon;
Histo1DPtr _h_y_DiMuon;
Histo1DPtr _h_xF_DiMuon;
Histo1DPtr _hist_pT_M_78,_hist_pT_M_89,_hist_pT_M_1011,_hist_pT_M_1113,_hist_pT_M_1318;
//@}
};
RIVET_DECLARE_PLUGIN(E605_1991_I302822);
}
|