Rivet analyses

title: BABAR_2008_I767506

$J/\psi\omega$ mass in $B\to J/\psi\omega K$

Experiment: BABAR (PEP-II)

Inspire ID: 767506

Status: VALIDATED NOHEPDATA

Authors: - Peter Richardson

References: - Phys.Rev.Lett. 101 (2008) 082001

Beams: * *

Beam energies: ANY

Run details: - Any process producing B mesins, originally Upsilon(4S) decays

Measurement of the $J/\psi\omega$ mass distribution in $B\to J/\psi\omega K$. The background subtracted corrected data were read from figure 3 in the paper.

Source code:BABAR_2008_I767506.cc

```c++ // -- C++ --

include "Rivet/Analysis.hh"

include "Rivet/Projections/DecayedParticles.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief B -> J/psi omega K class BABAR_2008_I767506 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2008_I767506);


/// @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(223);
  BB.addStable(443);
  declare(BB, "BB");
  // histos
  for (unsigned int ix = 0; ix < 2; ++ix) book(_h[ix], 1, 1, 1 + ix);
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  static const map<PdgId, unsigned int>& mode1 = {{443, 1}, {223, 1}, {321, 1}};
  static const map<PdgId, unsigned int>& mode1CC = {{443, 1}, {223, 1}, {-321, 1}};
  static const map<PdgId, unsigned int>& mode2 = {{443, 1}, {223, 1}, {130, 1}};
  static const map<PdgId, unsigned int>& mode2CC = {{443, 1}, {223, 1}, {310, 1}};
  DecayedParticles BB = apply<DecayedParticles>(event, "BB");
  // loop over particles
  for (unsigned int ix = 0; ix < BB.decaying().size(); ++ix) {
    unsigned int imode = 0;
    if (BB.modeMatches(ix, 3, mode1) || BB.modeMatches(ix, 3, mode1CC))
      imode = 0;
    else if (BB.modeMatches(ix, 3, mode2) || BB.modeMatches(ix, 3, mode2CC))
      imode = 1;
    else
      continue;
    const Particle& omega = BB.decayProducts()[ix].at(223)[0];
    const Particle& psi = BB.decayProducts()[ix].at(443)[0];
    _h[imode]->fill((omega.momentum() + psi.momentum()).mass());
  }
}


/// Normalise histograms etc., after the run
void finalize() {
  for (unsigned int ix = 0; ix < 2; ++ix) normalize(_h[ix], 1., false);
}

/// @}


/// @name Histograms
/// @{
Histo1DPtr _h[2];
/// @}

};

RIVET_DECLARE_PLUGIN(BABAR_2008_I767506);

} ```