Rivet analyses
V0 production ratios in pp collisions at $\sqrt{s}= 0.9$ and 7 TeV at LHCb
Experiment: LHCb (LHC)
Inspire ID: 917009
Status: VALIDATED
Authors: - Alex Grecu
References: - JHEP08:034,2011 - arXiv: 1107.0882 - DOI: 10.1007/JHEP08(2011)034
Beams: p+ p+
Beam energies: (450.0, 450.0); (3500.0, 3500.0)GeV
Run details: - QCD events. LHCb minimum bias, Perugia 0 and Perugia NOCR tune events used for reproducing published histograms.
This paper presents the production ratios for Λ̄/Λ and Λ̄/Ks0 measured by LHCb detector in 2010 at $\sqrt{s} = 0.9$ TeV and 7 TeV as functions of the transverse momentum p⟂ and the rapidity y in the ranges $0.15 < p_\perp < 2.50~\GeV/c$ and 2.0 < y < 4.5, respectively. The results for the two energies are merged and represented as a function of rapidity loss Δy = ybeam − y.
Source
code:LHCB_2011_I917009.cc
// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief V0 production ratios at 0.9 and 7 TeV
class LHCB_2011_I917009 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(LHCB_2011_I917009);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
fillMap(partLftMap);
for (double eVal : allowedEnergies()) {
const int en = round(eVal);
if (isCompatibleWithSqrtS(eVal)) _sqs = en;
rap_beam = (en == 900)? 6.87 : 8.92;
rap_max = (en == 900)? 4. : 4.5;
bool is7TeV = en == 7000;
// Create the sets of temporary histograms that will be used to make the ratios in the finalize()
for (size_t i = 0; i < 12; ++i) {
book(_h[en+i], "TMP/"+to_str(en+i), 4+is7TeV, 2.0, rap_max);
}
for (size_t i = 12; i < 15; ++i) {
book(_h[en+i], "TMP/"+to_str(en+i), refData(8*is7TeV+5, 1, 1));
}
for (size_t i = 15; i < 18; ++i) {
book(_h[en+i], "TMP/"+to_str(en+i), 4+is7TeV, rap_beam - rap_max, rap_beam - 2.0);
}
int dsId = 8*is7TeV + 1;
for (size_t j = 0; j < 3; ++j) {
book(_s[en+10+j], dsId, 1, j+1);
book(_s[en+20+j], dsId+1, 1, j+1);
}
dsId += 2;
for (size_t j = 3; j < 6; ++j) {
book(_s[en+30+j-3], dsId, 1, 1);
dsId += 1;
book(_s[en+40+j-3], dsId, 1, 1);
dsId += 1;
}
}
raiseBeamErrorIf(_sqs==0);
if (_sqs == 900) {
rap_beam = 6.87;
rap_max = 4.;
pt_min = 0.25;
} else {
rap_beam = 8.92;
rap_max = 4.5;
pt_min = 0.15;
}
declare(UnstableParticles(), "UFS");
}
/// Perform the per-event analysis
void analyze(const Event& event) {
const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
double ancestor_lftsum = 0.0;
double y, pT;
int id;
int partIdx = -1;
for (const Particle& p : ufs.particles()) {
id = p.pid();
// continue if particle not a K0s nor (anti-)Lambda
if ( (id == 310) || (id == -310) ) {
partIdx = 2;
} else if ( id == 3122 ) {
partIdx = 1;
} else if ( id == -3122 ) {
partIdx = 0;
} else {
continue;
}
ancestor_lftsum = getMotherLifeTimeSum(p);
// Lifetime cut: ctau sum of all particle ancestors < 10^-9 m according to the paper (see eq. 5)
const double MAX_CTAU = 1.0E-9; // [m]
if ( (ancestor_lftsum < 0.0) || (ancestor_lftsum > MAX_CTAU) ) continue;
const FourMomentum& qmom = p.momentum();
y = log((qmom.E() + qmom.pz())/(qmom.E() - qmom.pz()))/2.;
// skip this particle if it has too high or too low rapidity (extremely rare cases when E = +- pz)
if ( std::isnan(y) || std::isinf(y) ) continue;
y = fabs(y);
if (!inRange(y, 2.0, rap_max)) continue;
pT = sqrt((qmom.px() * qmom.px()) + (qmom.py() * qmom.py()));
if (!inRange(pT, pt_min, 2.5)) continue;
// Filling corresponding temporary histograms for pT intervals
if (inRange(pT, pt_min, 0.65)) _h[_sqs+partIdx*3]->fill(y);
if (inRange(pT, 0.65, 1.0)) _h[_sqs+partIdx*3+1]->fill(y);
if (inRange(pT, 1.0, 2.5)) _h[_sqs+partIdx*3+2]->fill(y);
// Fill histo in rapidity for whole pT interval
_h[_sqs+partIdx+9]->fill(y);
// Fill histo in pT for whole rapidity interval
_h[_sqs+partIdx+12]->fill(pT);
// Fill histo in rapidity loss for whole pT interval
_h[_sqs+partIdx+15]->fill(rap_beam - y);
}
}
// Generate the ratio histograms
void finalize() {
for (double eVal : allowedEnergies()) {
const int en = round(eVal);
for (size_t j = 0; j < 3; ++j) {
divide(_h[en+j], _h[en+3+j], _s[en+10+j]);
divide(_h[en+j], _h[en+6+j], _s[en+20+j]);
divide(_h[en+3*(j+3)], _h[en+3*(j+3)+1], _s[en+30+j]);
divide(_h[en+3*(j+3)], _h[en+3*(j+3)+2], _s[en+40+j]);
}
}
}
/// @}
// Get particle lifetime from hardcoded data
double getLifeTime(int pid) {
double lft = -1.0;
if (pid < 0) pid = - pid;
// Correct Pythia6 PIDs for f0(980), f0(1370) mesons
if (pid == 10331) pid = 30221;
if (pid == 10221) pid = 9010221;
map<int, double>::iterator pPartLft = partLftMap.find(pid);
// search stable particle list
if (pPartLft == partLftMap.end()) {
if (pid <= 100) return 0.0;
for (size_t i=0; i < sizeof(stablePDGIds)/sizeof(unsigned int); i++) {
if (pid == stablePDGIds[i]) { lft = 0.0; break; }
}
} else {
lft = (*pPartLft).second;
}
if (lft < 0.0 && PID::isHadron(pid)) {
MSG_ERROR("Could not determine lifetime for particle with PID " << pid
<< "... This V^0 will be considered unprompt!");
}
return lft;
}
// Data members like post-cuts event weight counters go here
double getMotherLifeTimeSum(const Particle& p) {
if (p.genParticle() == nullptr) return -1.;
double lftSum = 0.;
double plft = 0.;
ConstGenParticlePtr part = p.genParticle();
ConstGenVertexPtr ivtx = part->production_vertex();
while (ivtx) {
vector<ConstGenParticlePtr> part_in = HepMCUtils::particles(ivtx, Relatives::PARENTS);
if (part_in.size() < 1) { lftSum = -1.; break; };
ConstGenParticlePtr part = part_in.at(0);//(*iPart_invtx);
if ( !(part) ) { lftSum = -1.; break; };
ivtx = part->production_vertex();
if ( (part->pdg_id() == 2212) || !(ivtx) ) break; //reached beam
plft = getLifeTime(part->pdg_id());
if (plft < 0.) { lftSum = -1.; break; };
lftSum += plft;
};
return (lftSum * c_light);
}
private:
/// @name Private variables
/// @{
// The rapidity of the beam according to the selected beam energy
double rap_beam;
// The edges of the intervals of transverse momentum
double pt_min;
// The limits of the rapidity window
double rap_max;
// Map between PDG id and particle lifetimes in seconds
map<int, double> partLftMap;
// Set of PDG Ids for stable particles (PDG Id <= 100 are considered stable)
static const int stablePDGIds[205];
size_t _sqs = 0;
/// @}
/// @name Helper histograms
/// @{
/// Histograms are defined in the following order: anti-Lambda, Lambda and K0s.
/// First 3 suites of 3 histograms correspond to each particle in bins of y for the 3 pT intervals. (9 histos)
/// Next 3 histograms contain the particles in y bins for the whole pT interval (3 histos)
/// Next 3 histograms contain the particles in y_loss bins for the whole pT interval (3 histos)
/// Last 3 histograms contain the particles in pT bins for the whole rapidity (y) interval (3 histos)
map<size_t,Histo1DPtr> _h;
map<size_t,Estimate1DPtr> _s;
/// @}
// Fill the PDG ID to Lifetime[seconds] map
// Data was extracted from LHCb Particle Table through LHCb::ParticlePropertySvc
bool fillMap(map<int, double>& m) {
m[6] = 4.707703E-25; m[11] = 1.E+16; m[12] = 1.E+16;
m[13] = 2.197019E-06; m[14] = 1.E+16; m[15] = 2.906E-13; m[16] = 1.E+16; m[22] = 1.E+16;
m[23] = 2.637914E-25; m[24] = 3.075758E-25; m[25] = 9.4E-26; m[35] = 9.4E-26;
m[36] = 9.4E-26; m[37] = 9.4E-26; m[84] = 3.335641E-13; m[85] = 1.290893E-12;
m[111] = 8.4E-17; m[113] = 4.405704E-24; m[115] = 6.151516E-24; m[117] = 4.088275E-24;
m[119] = 2.102914E-24; m[130] = 5.116E-08; m[150] = 1.525E-12; m[211] = 2.6033E-08;
m[213] = 4.405704E-24; m[215] = 6.151516E-24; m[217] = 4.088275E-24; m[219] = 2.102914E-24;
m[221] = 5.063171E-19; m[223] = 7.752794E-23; m[225] = 3.555982E-24; m[227] = 3.91793E-24;
m[229] = 2.777267E-24; m[310] = 8.953E-11; m[313] = 1.308573E-23; m[315] = 6.038644E-24;
m[317] = 4.139699E-24; m[319] = 3.324304E-24; m[321] = 1.238E-08; m[323] = 1.295693E-23;
m[325] = 6.682357E-24; m[327] = 4.139699E-24; m[329] = 3.324304E-24; m[331] = 3.210791E-21;
m[333] = 1.545099E-22; m[335] = 9.016605E-24; m[337] = 7.565657E-24; m[350] = 1.407125E-12;
m[411] = 1.04E-12; m[413] = 6.856377E-21; m[415] = 1.778952E-23; m[421] = 4.101E-13;
m[423] = 1.000003E-19; m[425] = 1.530726E-23; m[431] = 5.E-13; m[433] = 1.000003E-19;
m[435] = 3.291061E-23; m[441] = 2.465214E-23; m[443] = 7.062363E-21; m[445] = 3.242425E-22;
m[510] = 1.525E-12; m[511] = 1.525E-12; m[513] = 1.000019E-19; m[515] = 1.31E-23;
m[521] = 1.638E-12; m[523] = 1.000019E-19; m[525] = 1.31E-23; m[530] = 1.536875E-12;
m[531] = 1.472E-12; m[533] = 1.E-19; m[535] = 1.31E-23; m[541] = 4.5E-13;
m[553] = 1.218911E-20; m[1112] = 4.539394E-24; m[1114] = 5.578069E-24; m[1116] = 1.994582E-24;
m[1118] = 2.269697E-24; m[1212] = 4.539394E-24; m[1214] = 5.723584E-24; m[1216] = 1.994582E-24;
m[1218] = 1.316424E-24; m[2112] = 8.857E+02; m[2114] = 5.578069E-24; m[2116] = 4.388081E-24;
m[2118] = 2.269697E-24; m[2122] = 4.539394E-24; m[2124] = 5.723584E-24; m[2126] = 1.994582E-24;
m[2128] = 1.316424E-24; m[2212] = 1.E+16; m[2214] = 5.578069E-24; m[2216] = 4.388081E-24;
m[2218] = 2.269697E-24; m[2222] = 4.539394E-24; m[2224] = 5.578069E-24; m[2226] = 1.994582E-24;
m[2228] = 2.269697E-24; m[3112] = 1.479E-10; m[3114] = 1.670589E-23; m[3116] = 5.485102E-24;
m[3118] = 3.656734E-24; m[3122] = 2.631E-10; m[102134] = 4.219309E-23; m[3126] = 8.227653E-24;
m[3128] = 3.291061E-24; m[3212] = 7.4E-20; m[3214] = 1.828367E-23; m[3216] = 5.485102E-24;
m[3218] = 3.656734E-24; m[3222] = 8.018E-11; m[3224] = 1.838582E-23; m[3226] = 5.485102E-24;
m[3228] = 3.656734E-24; m[3312] = 1.639E-10; m[3314] = 6.648608E-23; m[3322] = 2.9E-10;
m[3324] = 7.233101E-23; m[3334] = 8.21E-11; m[4112] = 2.991874E-22; m[4114] = 4.088274E-23;
m[4122] = 2.E-13; m[4132] = 1.12E-13; m[4212] = 3.999999E-22; m[4214] = 3.291061E-22;
m[4222] = 2.951624E-22; m[4224] = 4.417531E-23; m[4232] = 4.42E-13; m[4332] = 6.9E-14;
m[4412] = 3.335641E-13; m[4422] = 3.335641E-13; m[4432] = 3.335641E-13; m[5112] = 1.E-19;
m[5122] = 1.38E-12; m[5132] = 1.42E-12; m[5142] = 1.290893E-12; m[5212] = 1.E-19;
m[5222] = 1.E-19; m[5232] = 1.42E-12; m[5242] = 1.290893E-12; m[5312] = 1.E-19;
m[5322] = 1.E-19; m[5332] = 1.55E-12; m[5342] = 1.290893E-12; m[5442] = 1.290893E-12;
m[5512] = 1.290893E-12; m[5522] = 1.290893E-12; m[5532] = 1.290893E-12; m[5542] = 1.290893E-12;
m[10111] = 2.48382E-24; m[10113] = 4.635297E-24; m[10115] = 2.54136E-24; m[10211] = 2.48382E-24;
m[10213] = 4.635297E-24; m[10215] = 2.54136E-24; m[10223] = 1.828367E-24; m[10225] = 3.636531E-24;
m[10311] = 2.437823E-24; m[10313] = 7.313469E-24; m[10315] = 3.538775E-24;
m[10321] = 2.437823E-24; m[10323] = 7.313469E-24; m[10325] = 3.538775E-24;
m[10331] = 4.804469E-24; m[10411] = 4.38E-24; m[10413] = 3.29E-23; m[10421] = 4.38E-24;
m[10423] = 3.22653E-23; m[10431] = 6.5821E-22; m[10433] = 6.5821E-22; m[10441] = 6.453061E-23;
m[10511] = 4.39E-24; m[10513] = 1.65E-23; m[10521] = 4.39E-24; m[10523] = 1.65E-23;
m[10531] = 4.39E-24; m[10533] = 1.65E-23; m[11114] = 2.194041E-24; m[11116] = 1.828367E-24;
m[11212] = 1.880606E-24; m[11216] = 1.828367E-24; m[12112] = 2.194041E-24;
m[12114] = 2.194041E-24; m[12116] = 5.063171E-24; m[12126] = 1.828367E-24;
m[12212] = 2.194041E-24; m[12214] = 2.194041E-24; m[12216] = 5.063171E-24;
m[12224] = 2.194041E-24; m[12226] = 1.828367E-24; m[13112] = 6.582122E-24; m[13114] = 1.09702E-23;
m[13116] = 5.485102E-24; m[13122] = 1.316424E-23; m[13124] = 1.09702E-23; m[13126] = 6.928549E-24;
m[13212] = 6.582122E-24; m[13214] = 1.09702E-23; m[13216] = 5.485102E-24; m[13222] = 6.582122E-24;
m[13224] = 1.09702E-23; m[13226] = 5.485102E-24; m[13314] = 2.742551E-23;
m[13324] = 2.742551E-23; m[102142] = 1.828367E-22; m[20022] = 1.E+16; m[20113] = 1.567172E-24;
m[20213] = 1.567172E-24; m[20223] = 2.708692E-23; m[20313] = 3.782829E-24;
m[20315] = 2.384827E-24; m[20323] = 3.782829E-24; m[20325] = 2.384827E-24;
m[20333] = 1.198929E-23; m[20413] = 2.63E-24; m[20423] = 2.63E-24; m[20433] = 6.5821E-22;
m[20443] = 7.395643E-22; m[20513] = 2.63E-24; m[20523] = 2.63E-24; m[20533] = 2.63E-24;
m[21112] = 2.632849E-24; m[21114] = 3.291061E-24; m[21212] = 2.632849E-24;
m[21214] = 6.582122E-24; m[22112] = 4.388081E-24; m[22114] = 3.291061E-24;
m[22122] = 2.632849E-24; m[22124] = 6.582122E-24; m[22212] = 4.388081E-24;
m[22214] = 3.291061E-24; m[22222] = 2.632849E-24; m[22224] = 3.291061E-24;
m[23112] = 7.313469E-24; m[23114] = 2.991874E-24; m[23122] = 4.388081E-24;
m[23124] = 6.582122E-24; m[23126] = 3.291061E-24; m[23212] = 7.313469E-24;
m[23214] = 2.991874E-24; m[23222] = 7.313469E-24; m[23224] = 2.991874E-24;
m[30113] = 2.632849E-24; m[30213] = 2.632849E-24; m[30221] = 1.880606E-24;
m[30223] = 2.089563E-24; m[30313] = 2.056913E-24; m[30323] = 2.056913E-24;
m[30443] = 2.419898E-23; m[31114] = 1.880606E-24; m[31214] = 3.291061E-24;
m[32112] = 3.989164E-24; m[32114] = 1.880606E-24; m[32124] = 3.291061E-24;
m[32212] = 3.989164E-24; m[32214] = 1.880606E-24; m[32224] = 1.880606E-24;
m[33122] = 1.880606E-23; m[42112] = 6.582122E-24; m[42212] = 6.582122E-24;
m[43122] = 2.194041E-24; m[53122] = 4.388081E-24; m[100111] = 1.645531E-24;
m[100113] = 1.64553E-24; m[100211] = 1.645531E-24; m[100213] = 1.64553E-24;
m[100221] = 1.196749E-23; m[100223] = 3.061452E-24; m[100313] = 2.837122E-24;
m[100323] = 2.837122E-24; m[100331] = 4.459432E-25; m[100333] = 4.388081E-24;
m[100441] = 4.701516E-23; m[100443] = 2.076379E-21; m[100553] = 2.056913E-20;
m[200553] = 3.242425E-20; m[300553] = 3.210791E-23; m[9000111] = 8.776163E-24;
m[9000211] = 8.776163E-24; m[9000443] = 8.227652E-24; m[9000553] = 5.983747E-24;
m[9010111] = 3.164482E-24; m[9010211] = 3.164482E-24; m[9010221] = 9.403031E-24;
m[9010443] = 8.438618E-24; m[9010553] = 8.3318E-24; m[9020443] = 1.061633E-23;
m[9030221] = 6.038644E-24; m[9042413] = 2.07634E-21; m[9050225] = 1.394517E-24;
m[9060225] = 3.291061E-24; m[9080225] = 4.388081E-24; m[9090225] = 2.056913E-24;
m[9910445] = 2.07634E-21; m[9920443] = 2.07634E-21;
return true;
}
};
const int LHCB_2011_I917009::stablePDGIds[205] = {
311, 543, 545, 551, 555, 557, 1103, 2101, 2103, 2203, 3101, 3103, 3201, 3203, 3303,
4101, 4103, 102144, 4201, 4203, 4301, 4303, 4312, 4314, 4322, 4324, 4334, 4403, 4414,
4424, 4434, 4444, 5101, 5103, 5114, 5201, 5203, 5214, 5224, 5301, 5303, 5314, 5324,
5334, 5401, 5403, 5412, 5414, 5422, 5424, 5432, 5434, 5444, 5503, 5514, 5524, 5534,
5544, 5554, 10022, 10333, 10335, 10443, 10541, 10543, 10551, 10553, 10555, 11112,
12118, 12122, 12218, 12222, 13316, 13326, 20543, 20553, 20555, 23314, 23324, 30343,
30353, 30363, 30553, 33314, 33324, 41214, 42124, 52114, 52214, 100311, 100315, 100321,
100325, 100411, 100413, 100421, 100423, 100551, 100555, 100557, 110551, 110553, 110555,
120553, 120555, 130553, 200551, 200555, 210551, 210553, 220553, 1000001, 1000002,
1000003, 1000004, 1000005, 1000006, 1000011, 1000012, 1000013, 1000014, 1000015,
1000016, 1000021, 1000022, 1000023, 1000024, 1000025, 1000035, 1000037, 1000039,
2000001, 2000002, 2000003, 2000004, 2000005, 2000006, 2000011, 2000012, 2000013,
2000014, 2000015, 2000016, 3000111, 3000113, 3000211, 3000213, 3000221, 3000223,
3000331, 3100021, 3100111, 3100113, 3200111, 3200113, 3300113, 3400113, 4000001,
4000002, 4000011, 4000012, 5000039, 9000221, 9900012, 9900014, 9900016, 9900023,
9900024, 9900041, 9900042 };
RIVET_DECLARE_PLUGIN(LHCB_2011_I917009);
}