Rivet analyses

title: BABAR_2008_I755245

$D_s^{()+}K^-$ mass distribution in $B^-\to D_s^{()+}K^-\pi^-$

Experiment: BABAR (PEP-II)

Inspire ID: 755245

Status: VALIDATED NOHEPDATA

Authors: - Peter Richardson

References: - Phys.Rev.Lett. 100 (2008) 171803

Beams: * *

Beam energies: ANY

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

Measurement of the $D_s^{()+}K^-$ mass distribution in $B^-\to D_s^{()+}K^-\pi^-$ by BaBar. The background subtracted data was read from Figure 3 in the paper.

Source code:BABAR_2008_I755245.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/DecayedParticles.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief B- -> D_s(*) K- pi- class BABAR_2008_I755245 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2008_I755245);


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

/// Book histograms and initialise projections before the run
void init() {
  // projections
  UnstableParticles ufs = UnstableParticles(Cuts::abspid == 521);
  declare(ufs, "UFS");
  DecayedParticles BB(ufs);
  BB.addStable(431);
  BB.addStable(-431);
  BB.addStable(433);
  BB.addStable(-433);
  BB.addStable(310);
  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 = {{-431, 1}, {321, 1}, {211, 1}};
  static const map<PdgId, unsigned int>& mode1CC = {{431, 1}, {-321, 1}, {-211, 1}};
  static const map<PdgId, unsigned int>& mode2 = {{-433, 1}, {321, 1}, {211, 1}};
  static const map<PdgId, unsigned int>& mode2CC = {{433, 1}, {-321, 1}, {-211, 1}};
  DecayedParticles BB = apply<DecayedParticles>(event, "BB");
  for (unsigned int ix = 0; ix < BB.decaying().size(); ++ix) {
    int sign = 1, imode = 0;
    if (BB.decaying()[ix].pid() > 0 && BB.modeMatches(ix, 3, mode1)) {
      imode = 0;
      sign = 1;
    }
    else if (BB.decaying()[ix].pid() < 0 && BB.modeMatches(ix, 3, mode1CC)) {
      imode = 0;
      sign = -1;
    }
    else if (BB.decaying()[ix].pid() > 0 && BB.modeMatches(ix, 3, mode2)) {
      imode = 1;
      sign = 1;
    }
    else if (BB.decaying()[ix].pid() < 0 && BB.modeMatches(ix, 3, mode2CC)) {
      imode = 1;
      sign = -1;
    }
    else
      continue;
    const Particle& Kp = BB.decayProducts()[ix].at(sign * 321)[0];
    const Particle& Ds = BB.decayProducts()[ix].at(-sign * (431 + 2 * imode))[0];
    _h[imode]->fill((Kp.momentum() + Ds.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_I755245);

} ```