Rivet analyses

title: BELLE_2018_I1679584

Mass distributions in $\bar{B}^0\to\Lambda^+_c\bar{\Lambda}^-_c\bar{K}^0$

Experiment: BELLE (KEKB)

Inspire ID: 1679584

Status: VALIDATED NOHEPDATA

Authors: - Peter Richardson

References: - Eur.Phys.J.C 78 (2018) 11, 928

Beams: * *

Beam energies: ANY

Run details: - Any process producing B0, originally e+e- at Upsilon(4S)

Mass distributions in $\bar{B}^0\to\Lambda^+_c\bar{\Lambda}^-_c\bar{K}^0$. Data read from plots and sidebands given subtracted.

Source code:BELLE_2018_I1679584.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/DecayedParticles.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief Bbar0 -> Lambda_c+ Lambdabar_c- Kbar0 class BELLE_2018_I1679584 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2018_I1679584);


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

/// Book histograms and initialise projections before the run
void init() {
  UnstableParticles ufs = UnstableParticles(Cuts::abspid == 511);
  declare(ufs, "UFS");
  DecayedParticles B0(ufs);
  B0.addStable(4122);
  B0.addStable(-4122);
  B0.addStable(310);
  declare(B0, "B0");
  // histos
  for (unsigned int ix = 0; ix < 2; ++ix) book(_h[ix], 1 + ix, 1, 1);
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  static const map<PdgId, unsigned int>& mode = {{4122, 1}, {-4122, 1}, {310, 1}};
  DecayedParticles B0 = apply<DecayedParticles>(event, "B0");
  // loop over particles
  for (unsigned int ix = 0; ix < B0.decaying().size(); ++ix) {
    if (!B0.modeMatches(ix, 3, mode)) continue;
    const Particle& LamC = B0.decayProducts()[ix].at(4122)[0];
    const Particle& LamCBar = B0.decayProducts()[ix].at(-4122)[0];
    const Particle& K0 = B0.decayProducts()[ix].at(310)[0];
    if (B0.decaying()[ix].pid() < 0)
      _h[0]->fill((LamC.momentum() + K0.momentum()).mass());
    else
      _h[0]->fill((LamCBar.momentum() + K0.momentum()).mass());
    _h[1]->fill((LamC.momentum() + LamCBar.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(BELLE_2018_I1679584);

} ```