Rivet analyses referenceALICE_2021_I1946131Prompt strange-meson production at 5 TeVExperiment: ALICE (LHC) Inspire ID: 1946131 Status: VALIDATED Authors:
Beam energies: (2510.0, 2510.0); (522080.0, 522080.0) GeV Run details:
The production of prompt $D^0$, $D^+$, and $D^{*+}$ mesons was measured at midrapidity ($|y| < $0.5) in Pb-Pb collisions at the centre-of-mass energy per nucleon-nucleon pair $\sqrt{s}_\text{NN} = 5.0$ TeV with the ALICE detector at the LHC. The $D$ mesons were reconstructed via their hadronic decay channels and their production yields were measured in central (0-10%) and semicentral (30-50%) collisions. The measurement was performed up to a transverse momentum ($p_\text{T}$) of 36 or 50 GeV/c depending on the $D$ meson species and the centrality interval. For the first time in Pb-Pb collisions at the LHC, the yield of $D^0$ mesons was measured down to $p_\text{T} =$ 0, which allowed a model-independent determination of the $p_\text{T}$-integrated yield per unit of rapidity ($\text{d}N/\text{d}y$). A maximum suppression by a factor 5 and 2.5 was observed with the nuclear modification factor ($R_\text{AA}$) of prompt $D$ mesons at $p_\text{T} =$ 6-8 GeV/c for the 0-10% and 30-50% centrality classes, respectively. The $D$-meson $R_\text{AA}$ is compared with that of charged pions, charged hadrons, and $J/\psi$ mesons as well as with theoretical predictions. The analysis of the agreement between the measured $R_\text{AA}$, elliptic ($v_2$) and triangular ($v_3$) flow, and the model predictions allowed us to constrain the charm spatial diffusion coefficient $D_\text{s}$. Furthermore the comparison of $R_\text{AA}$ and $v_2$ with different implementations of the same models provides an important insight into the role of radiative energy loss as well as charm quark recombination in the hadronisation mechanisms. Source code: ALICE_2021_I1946131.cc 1// -*- C++ -*-
2#include <iostream>
3#include "Rivet/Analysis.hh"
4#include "Rivet/Projections/FinalState.hh"
5#include "Rivet/Projections/PromptFinalState.hh"
6#include "Rivet/Tools/AliceCommon.hh"
7#include "Rivet/Projections/AliceCommon.hh"
8#include "Rivet/Projections/UnstableParticles.hh"
9#include "Rivet/Projections/CentralityProjection.hh"
10#include "Rivet/Analysis.hh"
11#include "Rivet/Projections/UnstableParticles.hh"
12#include "Rivet/Tools/Cuts.hh"
13#include "Rivet/Projections/HepMCHeavyIon.hh"
14
15namespace Rivet {
16
17 /// @brief Prompt strange-meson production at 5 TeV
18 class ALICE_2021_I1946131 : public Analysis {
19 public:
20
21 RIVET_DEFAULT_ANALYSIS_CTOR(ALICE_2021_I1946131);
22
23 void mkAverage(const string& avgname, const vector<string>& estnames) {
24 for (auto& b : _e[avgname]->bins()) {
25 double wtotal = 0., vtotal = 0., etotal = 0.;
26 for (const string& ename : estnames) {
27 const auto& est = _e[ename]->binAt(b.xMid());
28 if (!_e[ename]->isVisible(est.index())) continue;
29 const double w = 1.0 / sqr( est.relErrAvg() );
30 wtotal += w;
31 vtotal += est.val() * w;
32 etotal += sqr( est.errAvg() * w );
33 }
34 b.set(vtotal / wtotal, sqrt(etotal) / wtotal);
35 }
36 }
37
38 void init() {
39
40 declareCentrality(ALICE::V0MMultiplicity(), "ALICE_2015_PBPBCentrality", "V0M","V0M");
41
42 const UnstableParticles ufsD0(Cuts::absrap < 0.5 && Cuts::pT > 0.*GeV && Cuts::abspid == 421);
43 declare(ufsD0, "ufsD0");
44
45 const UnstableParticles ufsDplus(Cuts::absrap < 0.5 && Cuts::pT > 2.*GeV && Cuts::abspid == 411);
46 declare(ufsDplus, "ufsDplus");
47
48 const UnstableParticles ufsDstar(Cuts::absrap < 0.5 && Cuts::pT > 2.*GeV && Cuts::abspid == 413);
49 declare(ufsDstar, "ufsDstar");
50
51 book(_c["sow_pp5TeV"], "_sow_pp5TeV");
52
53 size_t pt_idx = 1, part_idx = 7, beam_idx = 11, avg_idx = 17;
54 for (const string& part : vector<string>{ "D0", "Dplus", "Dstar" }) {
55 for (const string& cent : vector<string>{ "00-10", "30-50" }) {
56 book(_h[part+"Pt_"+cent], pt_idx++, 1, 1);
57 if (part != "D0") {
58 const string refname = mkAxisCode(part_idx++, 1, 1);
59 const YODA::Estimate1D ref = refData(refname);
60 string rname(part+"_D0"+cent);
61 book(_h["num_"+rname], "_num_"+rname, ref);
62 book(_h["den_"+rname], "_den_"+rname, ref);
63 book(_e[rname], refname);
64 }
65 else {
66 book(_c["sow_PbPb5TeV_"+cent], "_sow_PbPb5TeV_"+cent);
67 book(_e["average"+cent], avg_idx++, 1, 1);
68 }
69 size_t offset = cent == "00-10"? 0 : 3;
70 const string brefname = mkAxisCode(beam_idx + offset, 1, 1);
71 const YODA::Estimate1D bref = refData(brefname);
72 string rname(part+"PbPb_pp"+cent);
73 book(_h["num_"+rname], "_num_"+rname, bref);
74 book(_h["den_"+rname], "_den_"+rname, bref);
75 book(_e[rname], brefname);
76 }
77 ++beam_idx;
78 }
79
80 const string RAAname = mkAxisCode(19, 1, 1);
81 const Estimate1D& RAAref = refData(RAAname);
82 book(_h["num_RAAPbPb_pp"], "_num_RAA", RAAref);
83 book(_h["den_RAAPbPb_pp"], "_den_RAA", RAAref);
84 book(_e["RAAPbPb_pp"], RAAname);
85
86 }
87
88 void analyze(const Event& event) {
89
90 const ParticlePair& beam = beams();
91 string CollSystem = "Empty";
92 const double NN = 208;
93
94 if (beam.first.pid() == PID::LEAD && beam.second.pid() == PID::LEAD) {
95 CollSystem = "PBPB";
96 if (fuzzyEquals(sqrtS()/GeV, 5020*NN, 1E-3)) CollSystem += "5TeV";
97 }
98 if (beam.first.pid() == PID::PROTON && beam.second.pid() == PID::PROTON) {
99 CollSystem = "PP";
100 if (fuzzyEquals(sqrtS()/GeV, 5020, 1E-3)) CollSystem += "5TeV";
101 }
102
103 const Particles& particlesD0 = apply<UnstableParticles>(event,"ufsD0").particles();
104 const Particles& particlesDplus = apply<UnstableParticles>(event,"ufsDplus").particles();
105 const Particles& particlesDstar = apply<UnstableParticles>(event,"ufsDstar").particles();
106
107 if (CollSystem == "PP5TeV") {
108 _c["sow_pp5TeV"]->fill();
109
110 for (const Particle& p : particlesD0) {
111 if (p.fromBottom()) continue;
112 for (const string& cent : vector<string>{ "00-10", "30-50" }) {
113 _h["den_D0PbPb_pp"+cent]->fill(p.pT()/GeV);
114 _h["den_RAAPbPb_pp"]->fill(cent == "00-10"? 5. : 40.);
115 }
116 }
117
118 for (const Particle& p : particlesDplus) {
119 if (p.fromBottom()) continue;
120 for (const string& cent : vector<string>{ "00-10", "30-50" }) {
121 _h["den_DplusPbPb_pp"+cent]->fill(p.pT()/GeV);
122 }
123 }
124
125 for (const Particle& p : particlesDstar) {
126 if(p.fromBottom()) continue;
127 for (const string& cent : vector<string>{ "00-10", "30-50" }) {
128 _h["den_DstarPbPb_pp"+cent]->fill(p.pT()/GeV);
129 }
130 }
131 }
132
133 const CentralityProjection& centProj = apply<CentralityProjection>(event, "V0M");
134
135 const double cent_val = centProj();
136
137 if (cent_val >= 50.) vetoEvent;
138
139 if (CollSystem == "PBPB5TeV") {
140 string cent("");
141 if (cent_val < 10.) cent = "00-10";
142 else if(cent_val >= 30. && cent_val < 50.) cent = "30-50";
143
144 if (cent == "") vetoEvent;
145 _c["sow_PbPb5TeV_"+cent]->fill();
146 for (const Particle& p : particlesD0) {
147 if (p.fromBottom()) continue;
148 _h["D0Pt_"+cent]->fill(p.pT()/GeV);
149 _h["den_Dplus_D0"+cent]->fill(p.pT()/GeV);
150 _h["den_Dstar_D0"+cent]->fill(p.pT()/GeV);
151 _h["num_D0PbPb_pp"+cent]->fill(p.pT()/GeV);
152 _h["num_RAAPbPb_pp"]->fill(cent == "00-10"? 5. : 40.);
153 }
154
155 for (const Particle& p : particlesDplus) {
156 if (p.fromBottom()) continue;
157 _h["DplusPt_"+cent]->fill(p.pT()/GeV);
158 _h["num_Dplus_D0"+cent]->fill(p.pT()/GeV);
159 _h["num_DplusPbPb_pp"+cent]->fill(p.pT()/GeV);
160 }
161
162 for (const Particle& p : particlesDstar) {
163 if (p.fromBottom()) continue;
164 _h["DstarPt_"+cent]->fill(p.pT()/GeV);
165 _h["num_Dstar_D0"+cent]->fill(p.pT()/GeV);
166 _h["num_DstarPbPb_pp"+cent]->fill(p.pT()/GeV);
167 }
168 }
169 }
170
171 void finalize() {
172
173 for (auto& item : _h) {
174 if (item.first.find("_D0") == string::npos) continue;
175 if (item.first.substr(0, 4) == "den_" && item.first.find("_pp") != string::npos) {
176 if (item.first.find("RAA") != string::npos) {
177 item.second->bin(1).scaleW( _n["00-10"]/_c["sow_pp5TeV"]->sumW() );
178 item.second->bin(3).scaleW( _n["30-50"]/_c["sow_pp5TeV"]->sumW() );
179 continue;
180 }
181 const string cent(item.first.substr(item.first.length()-5));
182 scale(item.second, _n[cent]/_c["sow_pp5TeV"]->sumW());
183 continue;
184 }
185 string sfname = "sow_PbPb5TeV_";
186 if (item.first.find("00-10") != string::npos) sfname += "00-10";
187 else sfname += "30-50";
188 const double sf = (item.first.find("PbPb") != string::npos)? 1.0 : 0.5;
189 if (item.first.find("RAA") != string::npos) {
190 item.second->bin(1).scaleW( sf/_c["sow_pp5TeV00-10"]->sumW() );
191 item.second->bin(3).scaleW( sf/_c["sow_pp5TeV30-50"]->sumW() );
192 continue;
193 }
194 scale(item.second, sf / _c[sfname]->sumW());
195 }
196
197 for (auto& item : _e) {
198 if (item.first.find("_") == string::npos) continue;
199 divide(_h["num_"+item.first], _h["den_"+item.first], item.second);
200 }
201
202 for (const string& cen : vector<string>{ "00-10", "30-50" }) {
203 mkAverage("average"+cen, { "D0PbPb_pp"+cen, "DplusPbPb_pp"+cen, "DstarPbPb_pp"+cen });
204 }
205
206 }
207
208 map<string, Histo1DPtr> _h;
209 map<string, CounterPtr> _c;
210 map<string, Estimate1DPtr> _e;
211 map<string, double> _n{ {"00-10", 1572.}, {"30-50", 264.8} };
212
213 };
214
215 RIVET_DECLARE_PLUGIN(ALICE_2021_I1946131);
216
217}
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