Rivet analyses

q2 spectrum in B̄0 → D*+ℓ−ν̄ℓ

Experiment: ARGUS (DORIS)

Inspire ID: 340585

Status: VALIDATED NOHEPDATA

Authors: - Peter Richardson

References: - Z.Phys.C 57 (1993) 533-540

Beams: * *

Beam energies: ANY

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

q2 spectrum in B̄0 → D*+ℓ−ν̄ℓ. Corrected data read from figure 7.

Source code:ARGUS_1993_I340585.cc

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

namespace Rivet {


  /// @brief B -> D* l nu
  class ARGUS_1993_I340585 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(ARGUS_1993_I340585);


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

    /// Book histograms and initialise projections before the run
    void init() {
      // Initialise and register projections
      UnstableParticles ufs = UnstableParticles(Cuts::abspid == 511);
      declare(ufs, "UFS");
      DecayedParticles BB(ufs);
      BB.addStable(411);
      BB.addStable(-411);
      BB.addStable(421);
      BB.addStable(-421);
      BB.addStable(413);
      BB.addStable(-413);
      BB.addStable(423);
      BB.addStable(-423);
      BB.addStable(PID::PI0);
      declare(BB, "BB");
      // histos
      book(_h, 1, 1, 1);
      book(_c, "TMP/nB");
    }


    /// Perform the per-event analysis
    void analyze(const Event& event) {
      // loop over B mesons
      DecayedParticles BB = apply<DecayedParticles>(event, "BB");
      // loop over particles
      for (unsigned int ix = 0; ix < BB.decaying().size(); ++ix) {
        _c->fill();
        for (unsigned int il = 0; il < 4; ++il) {
          if (BB.modeMatches(ix, 3, mode[il])) {
            int sign = il % 2 == 0 ? -1 : 1;
            const Particle& DD = BB.decayProducts()[ix].at(sign * 413)[0];
            FourMomentum qq = BB.decaying()[ix].mom() - DD.mom();
            _h->fill(qq.mass2());
          }
        }
      }
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      scale(_h, 0.5 / *_c);
    }

    /// @}


    /// @name Histograms
    /// @{
    Histo1DPtr _h;
    CounterPtr _c;
    const map<PdgId, unsigned int> mode[4] = {{{-413, 1}, {-11, 1}, {12, 1}},
                                              {{413, 1}, {11, 1}, {-12, 1}},
                                              {{-413, 1}, {-13, 1}, {14, 1}},
                                              {{413, 1}, {13, 1}, {-14, 1}}};
    /// @}
  };


  RIVET_DECLARE_PLUGIN(ARGUS_1993_I340585);

}