Rivet analyses

J/ψω mass in B → J/ψωK

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/ψω mass distribution in B → J/ψωK. The background subtracted corrected data were read from figure 3 in the paper.

Source code:`BABAR_2008_I767506.cc`

// -*- 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);

}

Rivet analyses

J/ψω mass in B → J/ψωK

Source code:BABAR_2008_I767506.cc

Source code:`BABAR_2008_I767506.cc`