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Rivet analyses reference
LHCB_2022_I1960979
Mass distributions in $B_c^+\to J/\psi+$ $\pi^+\pi^+\pi^-$, $K^+K^-\pi^+$ and $K^+\pi^+\pi^-$
Experiment: LHCB (LHC)
Inspire ID: 1960979
Status: VALIDATED NOHEPDATA
Authors:
References:
Beams: * *
Beam energies: ANY
Run details:
- Any process producing B_c+, originally pp
Mass distributions in $B_c^+\to J/\psi+$ $\pi^+\pi^+\pi^-$, $K^+K^-\pi^+$ and $K^+\pi^+\pi^-$. The data were read from the plots in the paper and may not be corrected for efficiency and acceptance.
Source code:
LHCB_2022_I1960979.cc
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109 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief B_c - > jpsi + 3 charged hadrons
class LHCB_2022_I1960979 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(LHCB_2022_I1960979);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
UnstableParticles ufs = UnstableParticles(Cuts::abspid==541);
declare(ufs, "UFS");
DecayedParticles BC(ufs);
BC.addStable( PID::PI0);
BC.addStable( PID::K0S);
BC.addStable( PID::JPSI);
declare(BC, "BC");
for(unsigned int ix=0;ix<4;++ix) {
for(unsigned int iy=0;iy<2;++iy) {
if(iy==1&&ix>1) continue;
book(_h[ix][iy],1+ix,1,1+iy);
}
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId,unsigned int> & mode1 = { { 443,1}, { 211,2}, {-211,1} };
static const map<PdgId,unsigned int> & mode1CC = { { 443,1}, {-211,2}, { 211,1} };
static const map<PdgId,unsigned int> & mode2 = { { 443,1}, { 321,1}, {-321,1}, { 211,1} };
static const map<PdgId,unsigned int> & mode2CC = { { 443,1}, { 321,1}, {-321,1}, {-211,1} };
static const map<PdgId,unsigned int> & mode3 = { { 443,1}, { 211,1}, {-211,1}, { 321,1} };
static const map<PdgId,unsigned int> & mode3CC = { { 443,1}, { 211,1}, {-211,1}, {-321,1} };
static const map<PdgId,unsigned int> & mode4 = { { 443,1}, { 321,2}, {-321,1} };
static const map<PdgId,unsigned int> & mode4CC = { { 443,1}, { 321,1}, {-321,2} };
DecayedParticles BC = apply<DecayedParticles>(event, "BC");
// loop over particles
for(unsigned int ix=0;ix<BC.decaying().size();++ix) {
int sign = BC.decaying()[ix].pid()/BC.decaying()[ix].abspid();
if ((sign== 1 && BC.modeMatches(ix,4,mode1 )) ||
(sign==-1 && BC.modeMatches(ix,4,mode1CC))) {
const Particle & pim = BC.decayProducts()[ix].at(-sign*211)[0];
const Particles & pip = BC.decayProducts()[ix].at( sign*211);
_h[0][0]->fill((pim.momentum()+pip[0].momentum()+pip[1].momentum()).mass());
_h[0][1]->fill((pim.momentum()+pip[0].momentum()).mass());
_h[0][1]->fill((pim.momentum()+pip[1].momentum()).mass());
}
else if((sign== 1 && BC.modeMatches(ix,4,mode2 )) ||
(sign==-1 && BC.modeMatches(ix,4,mode2CC))) {
const Particle & Kp = BC.decayProducts()[ix].at( sign*321)[0];
const Particle & Km = BC.decayProducts()[ix].at(-sign*321)[0];
const Particle & pip = BC.decayProducts()[ix].at( sign*211)[0];
_h[1][0]->fill((Km.momentum()+pip.momentum()).mass());
_h[1][1]->fill((Km.momentum()+Kp .momentum()).mass());
}
else if((sign== 1 && BC.modeMatches(ix,4,mode3 )) ||
(sign==-1 && BC.modeMatches(ix,4,mode3CC))) {
const Particle & pim = BC.decayProducts()[ix].at(-sign*211)[0];
const Particle & Kp = BC.decayProducts()[ix].at( sign*321)[0];
_h[2][0]->fill((Kp.momentum()+pim.momentum()).mass());
}
else if((sign== 1 && BC.modeMatches(ix,4,mode4 )) ||
(sign==-1 && BC.modeMatches(ix,4,mode4CC))) {
const Particle & Km = BC.decayProducts()[ix].at(-sign*321)[0];
const Particles & Kp = BC.decayProducts()[ix].at( sign*321);
_h[3][0]->fill((Kp[0].momentum()+Km.momentum()).mass());
_h[3][0]->fill((Kp[1].momentum()+Km.momentum()).mass());
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
for(unsigned int ix=0;ix<3;++ix) {
for(unsigned int iy=0;iy<2;++iy) {
if(iy==1&&ix>1) continue;
normalize(_h[ix][iy],1.,false);
}
}
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h[4][2];
/// @}
};
RIVET_DECLARE_PLUGIN(LHCB_2022_I1960979);
}
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