Rivet analyses referenceCMS_2010_I845323Charged-particle pT and pseudorapidity spectra from pp collisions at 900 and 2360 GeV.Experiment: CMS (LHC) Inspire ID: 845323 Status: VALIDATED Authors:
Beam energies: (450.0, 450.0); (1180.0, 1180.0) GeV Run details:
Charged particle spectra are measured in proton-proton collisions at center-of-mass energies 900 and 2360 GeV. The spectra are normalized to all non-single-diffractive (NSD) events using corrections for trigger and selection efficiency, acceptance, and branching ratios. There are transverse-momentum (pT) spectra from 0.1 to 2 GeV in bins of pseudorapidity (eta) and pT spectra from 0.1 to 4 GeV for |eta|<2.4. The eta spectra come from the average of three methods and cover |eta|<2.5 and are corrected to include all pT. The data were corrected according to the SD/DD/ND content of the CMS trigger, as predicted by PYTHIA6. The uncertainties connected with correct or incorrect modelling of diffraction were included in the systematic errors. Source code: CMS_2010_I845323.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/ChargedFinalState.hh"
4
5namespace Rivet {
6
7
8 /// Charged-particle pT and pseudorapidity spectra from pp collisions at 900 and 2360 GeV
9 class CMS_2010_I845323 : public Analysis {
10 public:
11
12 RIVET_DEFAULT_ANALYSIS_CTOR(CMS_2010_I845323);
13
14
15 /// @{
16
17 void init() {
18 ChargedFinalState cfs(Cuts::abseta < 2.5);
19 declare(cfs, "CFS");
20
21 for (double eVal : allowedEnergies()) {
22 const string en = toString(int(eVal));
23 if (isCompatibleWithSqrtS(eVal)) _sqs = en;
24 bool offset(en == "2360"s);
25
26 for (int d=0; d<3; ++d) {
27 for (int y=0; y<4; ++y) {
28 size_t bin = 4*d+y;
29 book(_h[en+"dNch_dpT"+toString(bin)], d+(offset? 4 : 1), 1, y+1);
30 }
31 }
32 book(_h[en+"dNch_dpT_all"], 7, 1, 1+offset);
33 book(_h[en+"dNch_dEta"], 8, 1, 1+offset);
34 }
35 if (_sqs == "" && !merging()) {
36 throw BeamError("Invalid beam energy for " + name() + "\n");
37 }
38 }
39
40
41 void analyze(const Event& event) {
42
43 //charged particles
44 const ChargedFinalState& charged = apply<ChargedFinalState>(event, "CFS");
45
46 for (const Particle& p : charged.particles()) {
47 //selecting only charged hadrons
48 if (! PID::isHadron(p.pid())) continue;
49
50 const double pT = p.pT();
51 const double eta = p.eta();
52
53 // The data is actually a duplicated folded distribution. This should mimic it.
54 _h[_sqs+"dNch_dEta"]->fill(eta, 0.5);
55 _h[_sqs+"dNch_dEta"]->fill(-eta, 0.5);
56 if (fabs(eta) < 2.4 && pT > 0.1*GeV) {
57 if (pT < 4.0*GeV) {
58 _h[_sqs+"dNch_dpT_all"]->fill(pT/GeV, 1.0/(pT/GeV));
59 if (pT < 2.0*GeV) {
60 const string suff = toString(int(fabs(eta)/0.2));
61 _h[_sqs+"dNch_dpT"+suff]->fill(pT/GeV);
62 }
63 }
64 }
65 }
66 }
67
68
69 void finalize() {
70 const double normfac = 1.0/sumOfWeights(); // Normalizing to unit eta is automatic
71 // The pT distributions in bins of eta must be normalized to unit eta. This is a factor of 2
72 // for the |eta| times 0.2 (eta range).
73 // The pT distributions over all eta are normalized to unit eta (2.0*2.4) and by 1/2*pi*pT.
74 // The 1/pT part is taken care of in the filling. The 1/2pi is taken care of here.
75 const double normpT = normfac/(2.0*0.2);
76 const double normpTall = normfac/(2.0*M_PI*2.0*2.4);
77
78 for (auto& item : _h) {
79 if (item.first.find("_dEta") != string::npos) {
80 scale(item.second, normfac);
81 }
82 else if (item.first.find("_all") != string::npos) {
83 scale(item.second, normpTall);
84 }
85 else {
86 scale(item.second, normpT);
87 }
88 }
89 }
90
91 /// @}
92
93
94 private:
95
96 /// @{
97 map<string, Histo1DPtr> _h;
98
99 string _sqs = "";
100 /// @}
101
102 };
103
104
105
106 RIVET_DECLARE_ALIASED_PLUGIN(CMS_2010_I845323, CMS_2010_S8547297);
107
108}
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