Rivet analyses referenceCMS_2020_I1837084Measurement of the Z boson differential production cross section using its invisible decay mode in proton-proton collisions at 13 TeVExperiment: CMS (LHC) Inspire ID: 1837084 Status: VALIDATED Authors:
Beam energies: (6500.0, 6500.0) GeV Run details:
Measurements of the total and differential fiducial cross sections for the Z boson decaying into two neutrinos are presented at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV. The data were collected by the CMS detector in 2016 and correspond to an integrated luminosity of 35.9 fb-1. In these measurements, events are selected containing an imbalance in transverse momentum and one or more energetic jets. The fiducial differential cross section is measured as a function of the Z boson transverse momentum. The results are combined with a previous measurement of charged-lepton decays of the Z boson. Source code: CMS_2020_I1837084.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/FinalState.hh"
4#include "Rivet/Projections/FastJets.hh"
5#include "Rivet/Projections/DressedLeptons.hh"
6#include "Rivet/Projections/MissingMomentum.hh"
7#include "Rivet/Projections/PromptFinalState.hh"
8#include "Rivet/Projections/ZFinder.hh"
9
10namespace Rivet {
11
12
13 /// Measurements of differential Z-boson -> ll and vv production cross-sections in 13 TeV pp collisions
14 class CMS_2020_I1837084 : public Analysis {
15 public:
16
17 /// Constructor
18 RIVET_DEFAULT_ANALYSIS_CTOR(CMS_2020_I1837084);
19
20
21 /// @name Analysis methods
22 /// @{
23
24 /// Book histograms and initialise projections before the run
25 void init() {
26
27 // Initialise and register projections
28 ZFinder zmmFind(FinalState(), Cuts::pT > 0*GeV, PID::MUON, 76.1876*GeV, 106.1876*GeV, 0.1,
29 ZFinder::ChargedLeptons::PROMPT, ZFinder::ClusterPhotons::NODECAY, ZFinder::AddPhotons::YES );
30 declare(zmmFind, "ZmmFind");
31
32 // Book histograms
33 book(_h_Z_pt, 12, 1, 1);
34 book(_h_Z_pt_norm, 13, 1, 1);
35
36 }
37
38
39 /// Perform the per-event analysis
40 void analyze(const Event& event) {
41
42 const Particles& zmms = apply<ZFinder>(event, "ZmmFind").bosons();
43
44 if (zmms.size() == 1 && zmms[0].pT() > 200*GeV) {
45 _h_Z_pt ->fill(min(zmms[0].pT()/GeV, 1499.999));
46 _h_Z_pt_norm->fill(min(zmms[0].pT()/GeV, 1499.999));
47 }
48
49 }
50
51
52 /// @todo Replace with barchart()
53 void normalizeToSum(Histo1DPtr hist) {
54 //double sum = 0.;
55 for (size_t i = 0; i < hist->numBins(); ++i) {
56 //sum += hist->bin(i).height();
57 double width = hist->bin(i).width();
58 hist->bin(i).scaleW(width != 0 ? width : 1.);
59 }
60 if (hist->integral() > 0) scale(hist, 1./hist->integral());
61 }
62
63
64 /// Normalise histograms etc., after the run
65 void finalize() {
66
67 double norm = (sumOfWeights() != 0) ? crossSection()/femtobarn/sumOfWeights() : 1.0;
68
69 scale(_h_Z_pt, norm);
70
71 normalizeToSum(_h_Z_pt_norm);
72
73 }
74
75 /// @}
76
77
78 /// @name Histograms
79 /// @{
80 Histo1DPtr _h_Z_pt, _h_Z_pt_norm;
81 /// @}
82
83
84 };
85
86
87 RIVET_DECLARE_PLUGIN(CMS_2020_I1837084);
88
89}
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