Rivet analyses

D*±KS0 mass in B0 → D*+D*−KS0 decays

Experiment: BABAR (PEP-II)

Inspire ID: 723331

Status: VALIDATED NOHEPDATA

Authors: - Peter Richardson

References: - Phys.Rev.D 74 (2006) 091101

Beams: * *

Beam energies: ANY

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

Measurement of the D*±KS0 mass in B0 → D*+D*−KS0 decays. The efficiency corrected data were read from figure 1b in the paper.

Source code:BABAR_2006_I723331.cc

// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/DecayedParticles.hh"
#include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {


  /// @brief B0 -> D*+ D*- KS0
  class BABAR_2006_I723331 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2006_I723331);


    /// @name Analysis methods
    /// @{

    /// Book histograms and initialise projections before the run
    void init() {
      UnstableParticles ufs = UnstableParticles(Cuts::abspid == 511);
      declare(ufs, "UFS");
      DecayedParticles BB(ufs);
      BB.addStable(PID::PI0);
      BB.addStable(413);
      BB.addStable(-413);
      BB.addStable(PID::K0S);
      declare(BB, "BB");
      // histograms
      book(_h, 1, 1, 1);
    }


    /// Perform the per-event analysis
    void analyze(const Event& event) {
      static const map<PdgId, unsigned int>& mode = {{413, 1}, {-413, 1}, {310, 1}};
      // loop over particles
      DecayedParticles BB = apply<DecayedParticles>(event, "BB");
      for (unsigned int ix = 0; ix < BB.decaying().size(); ++ix) {
        if (!BB.modeMatches(ix, 3, mode)) continue;
        const Particle& K0 = BB.decayProducts()[ix].at(310)[0];
        const Particle& DsM = BB.decayProducts()[ix].at(413)[0];
        const Particle& DsP = BB.decayProducts()[ix].at(-413)[0];
        _h->fill((K0.momentum() + DsM.momentum()).mass());
        _h->fill((K0.momentum() + DsP.momentum()).mass());
      }
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      normalize(_h, 1., false);
    }

    /// @}


    /// @name Histograms
    /// @{
    Histo1DPtr _h;
    /// @}
  };


  RIVET_DECLARE_PLUGIN(BABAR_2006_I723331);

}