Rivet analyses
D0 measurement of the ϕ* distribution of muon pairs with masses between 30 and 500 GeV in 10.4 fb-1
Experiment: D0 (Tevatron)
Inspire ID: 1324946
Status: VALIDATED
Authors: - Simone Amoroso
References: - Phys.Rev. D91 (2015) 072002 - DOI: 10.1103/PhysRevD.91.072002 - arXiv: 1410.8052
Beams: p- p+
Beam energies: (980.0, 980.0)GeV
Run details: - Z/γ* production with decays to muons.
D0 measurement of the distribution of the variable ϕ* for muon pairs with masses between 30 and 500 GeV, using the complete run II data set collected at the Tevatron proton-antiproton collider. This corresponds to an integrated luminosity of 10.4fb−1 at $\sqrt{s}=1.96$ TeV. The data are corrected for detector effects and presented in bins of dimuon rapidity and mass.
Source
code:D0_2015_I1324946.cc
// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/DileptonFinder.hh"
namespace Rivet {
class D0_2015_I1324946 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(D0_2015_I1324946);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
DileptonFinder zfinder_mm(91.2*GeV, 0.0, Cuts::abseta < 2 && Cuts::pT > 15*GeV &&
Cuts::abspid == PID::MUON, Cuts::massIn(30*GeV, 500*GeV));
declare(zfinder_mm, "zfinder_mm");
book(_h_phistar_mm_peak_central, 1, 1, 1);
book(_h_phistar_mm_peak_forward, 2, 1, 1);
book(_h_phistar_mm_low_central, 3, 1, 1);
book(_h_phistar_mm_low_forward, 4, 1, 1);
book(_h_phistar_mm_high1, 5, 1, 1);
book(_h_phistar_mm_high2, 6, 1, 1);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
//70<Mmm<105
const DileptonFinder& zfinder_mm = apply<DileptonFinder>(event, "zfinder_mm");
if (zfinder_mm.bosons().size() == 1) {
Particles mm = zfinder_mm.constituents();
std::sort(mm.begin(), mm.end(), cmpMomByPt);
const FourMomentum& mminus = PID::charge3(mm[0].pid()) < 0 ? mm[0].momentum() : mm[1].momentum();
const FourMomentum& mplus = PID::charge3(mm[0].pid()) < 0 ? mm[1].momentum() : mm[0].momentum();
double phi_acop = M_PI - mapAngle0ToPi(mminus.phi() - mplus.phi());
double costhetastar = tanh((mminus.eta() - mplus.eta())/2);
double sin2thetastar = 1 - sqr(costhetastar);
if (sin2thetastar < 0) sin2thetastar = 0;
const double phistar = tan(phi_acop/2) * sqrt(sin2thetastar);
const FourMomentum& zmom = zfinder_mm.bosons()[0].momentum();
if (zmom.mass()<30*GeV || zmom.mass() >500*GeV) vetoEvent;
if( zmom.mass()>70 && zmom.mass()<100 && zmom.absrap()<1.0) _h_phistar_mm_peak_central->fill(phistar);
if( zmom.mass()>70 && zmom.mass()<100 && zmom.absrap()>1.0 && zmom.absrap()<2.0) _h_phistar_mm_peak_forward->fill(phistar);
if( zmom.mass()>30 && zmom.mass()<60 && zmom.absrap()<1.0) _h_phistar_mm_low_central->fill(phistar);
if( zmom.mass()>30 && zmom.mass()<60 && zmom.absrap()>1.0 && zmom.absrap()<2.0) _h_phistar_mm_low_forward->fill(phistar);
if( zmom.mass()>160 && zmom.mass()<300) _h_phistar_mm_high1->fill(phistar);
if( zmom.mass()>300 && zmom.mass()<500) _h_phistar_mm_high2->fill(phistar);
}
}
/// Normalise histograms etc., after the run
void finalize() {
normalize(_h_phistar_mm_low_central);
normalize(_h_phistar_mm_low_forward);
normalize(_h_phistar_mm_peak_central);
normalize(_h_phistar_mm_peak_forward);
normalize(_h_phistar_mm_high1);
normalize(_h_phistar_mm_high2);
}
/// @}
private:
/// @name Histograms
/// @{
Histo1DPtr _h_phistar_mm_low_central;
Histo1DPtr _h_phistar_mm_low_forward;
Histo1DPtr _h_phistar_mm_peak_central;
Histo1DPtr _h_phistar_mm_peak_forward;
Histo1DPtr _h_phistar_mm_high1;
Histo1DPtr _h_phistar_mm_high2;
/// @}
};
RIVET_DECLARE_PLUGIN(D0_2015_I1324946);
}