1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/FinalState.hh"
 4#include "Rivet/Projections/ZFinder.hh"
 5
 6namespace Rivet {
 7
 8  class D0_2015_I1324946 : public Analysis {
 9  public:
10
11    /// Constructor
12    RIVET_DEFAULT_ANALYSIS_CTOR(D0_2015_I1324946);
13
14
15    /// @name Analysis methods
16    //@{
17
18    /// Book histograms and initialise projections before the run
19    void init() {
20      FinalState fs;
21      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);
22      declare(zfinder_mm, "zfinder_mm");
23
24      book(_h_phistar_mm_peak_central, 1, 1, 1);
25      book(_h_phistar_mm_peak_forward, 2, 1, 1);
26      book(_h_phistar_mm_low_central, 3, 1, 1);
27      book(_h_phistar_mm_low_forward, 4, 1, 1);
28      book(_h_phistar_mm_high1, 5, 1, 1);
29      book(_h_phistar_mm_high2, 6, 1, 1);
30    }
31
32
33    /// Perform the per-event analysis
34    void analyze(const Event& event) {
35      const double weight = 1.0;
36
37
38      //70<Mmm<105
39      const ZFinder& zfinder_mm = apply<ZFinder>(event, "zfinder_mm");
40      if (zfinder_mm.bosons().size() == 1) {
41        Particles mm = zfinder_mm.constituents();
42        std::sort(mm.begin(), mm.end(), cmpMomByPt);
43        const FourMomentum& mminus = PID::charge3(mm[0].pid()) < 0 ? mm[0].momentum() : mm[1].momentum();
44        const FourMomentum& mplus  = PID::charge3(mm[0].pid()) < 0 ? mm[1].momentum() : mm[0].momentum();
45        double phi_acop = M_PI - mapAngle0ToPi(mminus.phi() - mplus.phi());
46        double costhetastar = tanh((mminus.eta() - mplus.eta())/2);
47        double sin2thetastar = 1 - sqr(costhetastar);
48        if (sin2thetastar < 0) sin2thetastar = 0;
49        const double phistar = tan(phi_acop/2) * sqrt(sin2thetastar);
50        const FourMomentum& zmom = zfinder_mm.bosons()[0].momentum();
51        if (zmom.mass()<30*GeV || zmom.mass() >500*GeV) vetoEvent;
52	
53        if( zmom.mass()>70 && zmom.mass()<100 && zmom.absrap()<1.0) _h_phistar_mm_peak_central->fill(phistar, weight);
54        if( zmom.mass()>70 && zmom.mass()<100 && zmom.absrap()>1.0  && zmom.absrap()<2.0) _h_phistar_mm_peak_forward->fill(phistar, weight);
55        if( zmom.mass()>30 && zmom.mass()<60  && zmom.absrap()<1.0) _h_phistar_mm_low_central->fill(phistar, weight);
56        if( zmom.mass()>30 && zmom.mass()<60 && zmom.absrap()>1.0 && zmom.absrap()<2.0) _h_phistar_mm_low_forward->fill(phistar, weight);
57        if( zmom.mass()>160 && zmom.mass()<300) _h_phistar_mm_high1->fill(phistar, weight);
58        if( zmom.mass()>300 && zmom.mass()<500) _h_phistar_mm_high2->fill(phistar, weight);
59	
60      }
61    }
62
63    /// Normalise histograms etc., after the run
64    void finalize() {
65
66      normalize(_h_phistar_mm_low_central);
67      normalize(_h_phistar_mm_low_forward);
68      normalize(_h_phistar_mm_peak_central);
69      normalize(_h_phistar_mm_peak_forward);
70      normalize(_h_phistar_mm_high1);
71      normalize(_h_phistar_mm_high2);
72
73    }
74
75
76    //}
77
78    //@}
79
80
81  private:
82    /// @name Histograms
83    //@{
84
85    Histo1DPtr _h_phistar_mm_low_central;
86    Histo1DPtr _h_phistar_mm_low_forward;
87    Histo1DPtr _h_phistar_mm_peak_central;
88    Histo1DPtr _h_phistar_mm_peak_forward;
89    Histo1DPtr _h_phistar_mm_high1;
90    Histo1DPtr _h_phistar_mm_high2;
91    //@}                                        
92  };
93
94
95
96  // The hook for the plugin system
97  RIVET_DECLARE_PLUGIN(D0_2015_I1324946);
98
99}