Rivet analyses

title: BABAR_2006_I723331

$D^{\pm}K^0_S$ mass in $B^0\to D^{+}D^{*-}K^0_S$ 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 $D^{\pm}K^0_S$ mass in $B^0\to D^{+}D^{*-}K^0_S$ decays. The efficiency corrected data were read from figure 1b in the paper.

Source code:BABAR_2006_I723331.cc

```c++ // -- 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);

} ```