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D0_2015_I1324946

D0 measurement of the $\phi^*$ 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: Beams: p- p+
Beam energies: (980.0, 980.0) GeV
Run details:
  • $Z/\gamma^*$ production with decays to muons.

D0 measurement of the distribution of the variable $\phi^*$ 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 $10.4 \text{fb}^{-1}$ 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
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// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/ZFinder.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() {
      FinalState fs;
      ZFinder zfinder_mm(fs, Cuts::abseta < 2 && Cuts::pT > 15*GeV, PID::MUON, 30*GeV, 500*GeV, 0.0, ZFinder::ClusterPhotons::NONE, ZFinder::AddPhotons::NO);
      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) {
      const double weight = 1.0;


      //70<Mmm<105
      const ZFinder& zfinder_mm = apply<ZFinder>(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, weight);
        if( zmom.mass()>70 && zmom.mass()<100 && zmom.absrap()>1.0  && zmom.absrap()<2.0) _h_phistar_mm_peak_forward->fill(phistar, weight);
        if( zmom.mass()>30 && zmom.mass()<60  && zmom.absrap()<1.0) _h_phistar_mm_low_central->fill(phistar, weight);
        if( zmom.mass()>30 && zmom.mass()<60 && zmom.absrap()>1.0 && zmom.absrap()<2.0) _h_phistar_mm_low_forward->fill(phistar, weight);
        if( zmom.mass()>160 && zmom.mass()<300) _h_phistar_mm_high1->fill(phistar, weight);
        if( zmom.mass()>300 && zmom.mass()<500) _h_phistar_mm_high2->fill(phistar, weight);
	
      }
    }

    /// 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;
    //@}                                        
  };



  // The hook for the plugin system
  RIVET_DECLARE_PLUGIN(D0_2015_I1324946);

}