Rivet analyses

title: BELLE_2004_I630328

Differential branching ratio w.r.t $p\bar{p}$ mass for $B^+\to p\bar{p} \pi^+,K^+,K^{*+}$ and $B^0\to p\bar{p}K^0_S$

Experiment: BELLE (KEKB)

Inspire ID: 630328

Status: VALIDATED NOHEPDATA

Authors: - Peter Richardson

References: - Phys.Rev.Lett. 92 (2004) 131801

Beams: * *

Beam energies: ANY

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

Measurement of the differential branching ratio with respect to the $p\bar{p}$ mass for $B^+\to p\bar{p} \pi^+,K^+,K^{*+}$ and $B^0\to p\bar{p}K^0_S$. The data was taken from table 1 in the paper.

Source code:BELLE_2004_I630328.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/DecayedParticles.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief B+ -> p pbar pi+/K+/K*+ and B0 -> p pbar KS0 class BELLE_2004_I630328 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2004_I630328);


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

/// Book histograms and initialise projections before the run
void init() {
  // projections
  UnstableParticles ufs = UnstableParticles(Cuts::abspid == 511 || Cuts::abspid == 521);
  declare(ufs, "UFS");
  DecayedParticles BB(ufs);
  BB.addStable(310);
  BB.addStable(323);
  BB.addStable(-323);
  declare(BB, "BB");
  // histograms
  for (unsigned int ix = 0; ix < 4; ++ix) {
    book(_h[ix], 1, 1, 1 + ix);
  }
  for (unsigned int ix = 0; ix < 2; ++ix) {
    book(_c[ix], "TMP/nB_" + toString(ix + 1));
  }
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  DecayedParticles BB = apply<DecayedParticles>(event, "BB");
  // loop over particles
  for (unsigned int ix = 0; ix < BB.decaying().size(); ++ix) {
    int imode = 0;
    if (BB.decaying()[ix].abspid() == 511)
      _c[0]->fill();
    else
      _c[1]->fill();
    if ((BB.decaying()[ix].pid() == 521 && BB.modeMatches(ix, 3, mode1))
        || (BB.decaying()[ix].pid() == -521 && BB.modeMatches(ix, 3, mode1CC)))
      imode = 0;
    else if ((BB.decaying()[ix].pid() == 521 && BB.modeMatches(ix, 3, mode2))
             || (BB.decaying()[ix].pid() == -521 && BB.modeMatches(ix, 3, mode2CC)))
      imode = 1;
    else if ((BB.decaying()[ix].pid() == 521 && BB.modeMatches(ix, 3, mode3))
             || (BB.decaying()[ix].pid() == -521 && BB.modeMatches(ix, 3, mode3CC)))
      imode = 2;
    else if (BB.decaying()[ix].abspid() == 511 && BB.modeMatches(ix, 3, mode4))
      imode = 3;
    else {
      continue;
    }
    const Particle& pp = BB.decayProducts()[ix].at(2212)[0];
    const Particle& pbar = BB.decayProducts()[ix].at(-2212)[0];
    const double mass = (pp.mom() + pbar.mom()).mass();
    _h[imode]->fill(mass);
  }
}


/// Normalise histograms etc., after the run
void finalize() {
  for (unsigned int ix = 0; ix < 4; ++ix) {
    if (ix == 2)
      scale(_h[ix], 1e6 / *_c[0]);
    else
      scale(_h[ix], 1e6 / *_c[1]);
  }
}

/// @}


/// @name Histograms
/// @{
Histo1DPtr _h[4];
CounterPtr _c[2];
const map<PdgId, unsigned int> mode1 = {{2212, 1}, {-2212, 1}, {321, 1}};
const map<PdgId, unsigned int> mode1CC = {{2212, 1}, {-2212, 1}, {-321, 1}};
const map<PdgId, unsigned int> mode2 = {{2212, 1}, {-2212, 1}, {211, 1}};
const map<PdgId, unsigned int> mode2CC = {{2212, 1}, {-2212, 1}, {-211, 1}};
const map<PdgId, unsigned int> mode3 = {{2212, 1}, {-2212, 1}, {323, 1}};
const map<PdgId, unsigned int> mode3CC = {{2212, 1}, {-2212, 1}, {-323, 1}};
const map<PdgId, unsigned int> mode4 = {{2212, 1}, {-2212, 1}, {310, 1}};
/// @}

};

RIVET_DECLARE_PLUGIN(BELLE_2004_I630328);

} ```