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Rivet analyses reference
BABAR_2015_I1308513
$J/\psi\phi$ mass spectrum in $B^{+,0}\to J/\psi \phi K^{+,0}$
Experiment: BABAR (PEP-II)
Inspire ID: 1308513
Status: VALIDATED NOHEPDATA
Authors:
References:
- Phys.Rev.D 91 (2015) 1, 012003
Beams: * *
Beam energies: ANY
Run details:
- Any process producing equal rates of B+ and B0 mesons, originally e+e- at Upsilon(4S)
$J/\psi\phi$ mass spectrum in $B^{+,0}\to J/\psi \phi K^{+,0}$. Only the final background subtracted, efficiency corrected distribution averaged over $B^+$ and $B^0$ is implemented.
Source code:
BABAR_2015_I1308513.cc
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76 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief B -> J/psi phi K
class BABAR_2015_I1308513 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2015_I1308513);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
UnstableParticles ufs = UnstableParticles(Cuts::abspid==511||
Cuts::abspid==521);
declare(ufs, "UFS");
DecayedParticles BB(ufs);
BB.addStable(310);
BB.addStable(333);
BB.addStable(443);
declare(BB, "BB");
// histo
book(_h,1,1,1);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId,unsigned int> & mode1 = { { 443,1},{ 333,1}, { 321,1}};
static const map<PdgId,unsigned int> & mode1CC = { { 443,1},{ 333,1}, {-321,1}};
static const map<PdgId,unsigned int> & mode2 = { { 443,1},{ 333,1}, { 130,1}};
static const map<PdgId,unsigned int> & mode2CC = { { 443,1},{ 333,1}, { 310,1}};
DecayedParticles BB = apply<DecayedParticles>(event, "BB");
// loop over particles
for(unsigned int ix=0;ix<BB.decaying().size();++ix) {
if (BB.modeMatches(ix,3,mode1) ||
BB.modeMatches(ix,3,mode1CC) ||
BB.modeMatches(ix,3,mode2) ||
BB.modeMatches(ix,3,mode2CC)) {
const Particle & phi = BB.decayProducts()[ix].at(333)[0];
const Particle & psi = BB.decayProducts()[ix].at(443)[0];
_h->fill((phi.momentum()+psi.momentum()).mass());
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
normalize(_h,1.,false);
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h;
/// @}
};
RIVET_DECLARE_PLUGIN(BABAR_2015_I1308513);
}
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