Rivet analyses referenceMC_ZZINCMonte Carlo validation observables for $Z[e^+ \, e^-]Z[\mu^+ \, \mu^-]$ productionExperiment: () Status: VALIDATED Authors:
Beams: * * Beam energies: ANY Run details:
Monte Carlo validation observables for $Z[e^+ \, e^-]Z[\mu^+ \, \mu^-]$ production Source code: MC_ZZINC.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/DileptonFinder.hh"
4#include "Rivet/Projections/VetoedFinalState.hh"
5
6namespace Rivet {
7
8
9 /// @brief MC validation analysis for Z[ee]Z[mumu] events
10 class MC_ZZINC : public Analysis {
11 public:
12
13 /// Default constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(MC_ZZINC);
15
16
17 /// @name Analysis methods
18 /// @{
19
20 /// Book histograms
21 void init() {
22 // set FS cuts from input options
23 const double etaecut = getOption<double>("ABSETAEMAX", 3.5);
24 const double ptecut = getOption<double>("PTEMIN", 25.);
25 Cut cut_e = Cuts::abseta < etaecut && Cuts::pT > ptecut*GeV;
26 DileptonFinder zeefinder(91.2*GeV, 0.2, cut_e && Cuts::abspid == PID::ELECTRON,
27 Cuts::massIn(65*GeV, 115*GeV));
28 declare(zeefinder, "ZeeFinder");
29
30 VetoedFinalState zmminput;
31 zmminput.addVetoOnThisFinalState(zeefinder);
32
33 // set FS cuts from input options
34 const double etamucut = getOption<double>("ABSETAMUMAX", 3.5);
35 const double ptmucut = getOption<double>("PTMUMIN", 25.);
36 Cut cut_mu = Cuts::abseta < etamucut && Cuts::pT > ptmucut*GeV;
37 DileptonFinder zmmfinder(PromptFinalState(zmminput), 91.2*GeV, 0.2, cut_mu &&
38 Cuts::abspid == PID::MUON, Cuts::massIn(65*GeV, 115*GeV));
39 declare(zmmfinder, "ZmmFinder");
40
41 // Properties of the pair momentum
42 double sqrts = sqrtS()>0. ? sqrtS() : 14000.;
43 book(_h_ZZ_pT ,"ZZ_pT", logspace(100, 1.0, 0.5*sqrts/GeV));
44 book(_h_ZZ_pT_peak ,"ZZ_pT_peak", 25, 0.0, 25.0);
45 book(_h_ZZ_eta ,"ZZ_eta", 40, -7.0, 7.0);
46 book(_h_ZZ_phi ,"ZZ_phi", 25, 0.0, TWOPI);
47 book(_h_ZZ_m ,"ZZ_m", logspace(100, 150.0, 180.0 + 0.25*sqrts/GeV));
48
49 // Correlations between the ZZ
50 book(_h_ZZ_dphi ,"ZZ_dphi", 25, 0.0, PI); /// @todo non-linear?
51 book(_h_ZZ_deta ,"ZZ_deta", 25, -7.0, 7.0);
52 book(_h_ZZ_dR ,"ZZ_dR", 25, 0.5, 7.0);
53 book(_h_ZZ_dpT ,"ZZ_dpT", logspace(100, 1.0, 0.5*sqrts/GeV));
54 book(_h_ZZ_costheta_planes ,"ZZ_costheta_planes", 25, -1.0, 1.0);
55
56 // Properties of the Z bosons
57 book(_h_Z_pT ,"Z_pT", logspace(100, 10.0, 0.25*sqrts/GeV));
58 book(_h_Z_eta ,"Z_eta", 70, -7.0, 7.0);
59
60 // Properties of the leptons
61 book(_h_Zl_pT ,"Zl_pT", logspace(100, 30.0, 0.1*sqrts/GeV));
62 book(_h_Zl_eta ,"Zl_eta", 40, -3.5, 3.5);
63
64 // Correlations between the opposite charge leptons
65 book(_h_ZeZm_dphi ,"ZeZm_dphi", 25, 0.0, PI);
66 book(_h_ZeZm_deta ,"ZeZm_deta", 25, -5.0, 5.0);
67 book(_h_ZeZm_dR ,"ZeZm_dR", 25, 0.5, 5.0);
68 book(_h_ZeZm_m ,"ZeZm_m", 100, 0.0, 300.0);
69
70 }
71
72
73
74 /// Do the analysis
75 void analyze(const Event& e) {
76 const DileptonFinder& zeefinder = apply<DileptonFinder>(e, "ZeeFinder");
77 if (zeefinder.bosons().size() != 1) vetoEvent;
78 const DileptonFinder& zmmfinder = apply<DileptonFinder>(e, "ZmmFinder");
79 if (zmmfinder.bosons().size() != 1) vetoEvent;
80
81 // Z momenta
82 const FourMomentum& zee = zeefinder.bosons()[0].momentum();
83 const FourMomentum& zmm = zmmfinder.bosons()[0].momentum();
84 const FourMomentum zz = zee + zmm;
85 // Lepton momenta
86 const FourMomentum& ep = zeefinder.constituents()[0].momentum();
87 const FourMomentum& em = zeefinder.constituents()[1].momentum();
88 const FourMomentum& mp = zmmfinder.constituents()[0].momentum();
89 const FourMomentum& mm = zmmfinder.constituents()[1].momentum();
90
91 _h_ZZ_pT->fill(zz.pT()/GeV);
92 _h_ZZ_pT_peak->fill(zz.pT()/GeV);
93 _h_ZZ_eta->fill(zz.eta());
94 _h_ZZ_phi->fill(zz.phi());
95 if (zz.mass2() > 0.0) ///< @todo Protection still needed?
96 _h_ZZ_m->fill(zz.mass()/GeV);
97
98 _h_ZZ_dphi->fill(deltaPhi(zee, zmm));
99 _h_ZZ_deta->fill(zee.eta()-zmm.eta());
100 _h_ZZ_dR->fill(deltaR(zee,zmm));
101 _h_ZZ_dpT->fill(fabs(zee.pT()-zmm.pT()));
102
103 const Vector3 crossZee = ep.p3().cross(em.p3());
104 const Vector3 crossZmm = mp.p3().cross(mm.p3());
105 const double costheta = crossZee.dot(crossZmm)/crossZee.mod()/crossZmm.mod();
106 _h_ZZ_costheta_planes->fill(costheta);
107
108 _h_Z_pT->fill(zee.pT()/GeV);
109 _h_Z_pT->fill(zmm.pT()/GeV);
110 _h_Z_eta->fill(zee.eta());
111 _h_Z_eta->fill(zmm.eta());
112
113 _h_Zl_pT->fill(ep.pT()/GeV);
114 _h_Zl_pT->fill(em.pT()/GeV);
115 _h_Zl_pT->fill(mp.pT()/GeV);
116 _h_Zl_pT->fill(mm.pT()/GeV);
117 _h_Zl_eta->fill(ep.eta());
118 _h_Zl_eta->fill(em.eta());
119 _h_Zl_eta->fill(mp.eta());
120 _h_Zl_eta->fill(mm.eta());
121
122 _h_ZeZm_dphi->fill(deltaPhi(ep, mm));
123 _h_ZeZm_deta->fill(ep.eta()-mm.eta());
124 _h_ZeZm_dR->fill(deltaR(ep, mm));
125 const FourMomentum epmm = ep + mm;
126 const double m_epmm = (epmm.mass2() > 0) ? epmm.mass() : 0; ///< @todo Protection still needed?
127 _h_ZeZm_m->fill(m_epmm/GeV);
128 }
129
130
131 /// Finalize
132 void finalize() {
133 const double s = crossSection()/picobarn/sumOfWeights();
134 scale(_h_ZZ_pT, s);
135 scale(_h_ZZ_pT_peak, s);
136 scale(_h_ZZ_eta, s);
137 scale(_h_ZZ_phi, s);
138 scale(_h_ZZ_m, s);
139 scale(_h_ZZ_dphi, s);
140 scale(_h_ZZ_deta, s);
141 scale(_h_ZZ_dR, s);
142 scale(_h_ZZ_dpT, s);
143 scale(_h_ZZ_costheta_planes, s);
144 scale(_h_Z_pT, s);
145 scale(_h_Z_eta, s);
146 scale(_h_Zl_pT, s);
147 scale(_h_Zl_eta, s);
148 scale(_h_ZeZm_dphi, s);
149 scale(_h_ZeZm_deta, s);
150 scale(_h_ZeZm_dR, s);
151 scale(_h_ZeZm_m, s);
152 }
153
154 /// @}
155
156
157 private:
158
159 /// @name Histograms
160 /// @{
161 Histo1DPtr _h_ZZ_pT;
162 Histo1DPtr _h_ZZ_pT_peak;
163 Histo1DPtr _h_ZZ_eta;
164 Histo1DPtr _h_ZZ_phi;
165 Histo1DPtr _h_ZZ_m;
166 Histo1DPtr _h_ZZ_dphi;
167 Histo1DPtr _h_ZZ_deta;
168 Histo1DPtr _h_ZZ_dR;
169 Histo1DPtr _h_ZZ_dpT;
170 Histo1DPtr _h_ZZ_costheta_planes;
171 Histo1DPtr _h_Z_pT;
172 Histo1DPtr _h_Z_eta;
173 Histo1DPtr _h_Zl_pT;
174 Histo1DPtr _h_Zl_eta;
175 Histo1DPtr _h_ZeZm_dphi;
176 Histo1DPtr _h_ZeZm_deta;
177 Histo1DPtr _h_ZeZm_dR;
178 Histo1DPtr _h_ZeZm_m;
179 /// @}
180
181 };
182
183
184
185 RIVET_DECLARE_PLUGIN(MC_ZZINC);
186
187}
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