Rivet analyses

title: BABAR_2012_I946659

Mass distributions in $B\to D^{(*)}p\bar{p}$ + pions

Experiment: BABAR (PEP-II)

Inspire ID: 946659

Status: VALIDATED NOHEPDATA

Authors: - Peter Richardson

References: - Phys.Rev.D 85 (2012) 092017

Beams: * *

Beam energies: ANY

Run details: - Any process producing B mesons, original e+e- at Upsilon(4S)

Measurements of mass distributions in Mass distributions in $B\to D^{(*)}p\bar{p}$ + pions. The data were read from the plots in the paper but are background subtracted and efficiency corrected.

Source code:BABAR_2012_I946659.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/DecayedParticles.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief B -> p pbar + pions class BABAR_2012_I946659 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2012_I946659);


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

/// Book histograms and initialise projections before the run
void init() {
  // Initialise and register projections
  UnstableParticles ufs = UnstableParticles(Cuts::abspid == 511 or Cuts::abspid == 521);
  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);
  declare(BB, "BB");
  // histograms
  for (unsigned int iy = 0; iy < 4; ++iy) {
    for (unsigned int ix = 0; ix < 4; ++ix) {
      if (ix < 2) book(_h[ix][iy], 1, 1 + ix, 1 + iy);
      book(_h[ix + 2][iy], 2, 1 + ix, 1 + iy);
      book(_h[ix + 6][iy], 3, 1 + ix, 1 + iy);
    }
  }
  book(_nB[0], "/TMP/nB0");
  book(_nB[1], "/TMP/nBP");
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  static const map<PdgId, unsigned int>& mode1 = {{421, 1}, {2212, 1}, {-2212, 1}};
  static const map<PdgId, unsigned int>& mode1CC = {{-421, 1}, {2212, 1}, {-2212, 1}};
  static const map<PdgId, unsigned int>& mode2 = {{423, 1}, {2212, 1}, {-2212, 1}};
  static const map<PdgId, unsigned int>& mode2CC = {{-423, 1}, {2212, 1}, {-2212, 1}};
  static const map<PdgId, unsigned int>& mode3 = {{411, 1}, {2212, 1}, {-2212, 1}, {-211, 1}};
  static const map<PdgId, unsigned int>& mode3CC = {{-411, 1}, {2212, 1}, {-2212, 1}, {211, 1}};
  static const map<PdgId, unsigned int>& mode4 = {{413, 1}, {2212, 1}, {-2212, 1}, {-211, 1}};
  static const map<PdgId, unsigned int>& mode4CC = {{-413, 1}, {2212, 1}, {-2212, 1}, {211, 1}};
  static const map<PdgId, unsigned int>& mode5 = {{421, 1}, {2212, 1}, {-2212, 1}, {-211, 1}};
  static const map<PdgId, unsigned int>& mode5CC = {{-421, 1}, {2212, 1}, {-2212, 1}, {211, 1}};
  static const map<PdgId, unsigned int>& mode6 = {{423, 1}, {2212, 1}, {-2212, 1}, {-211, 1}};
  static const map<PdgId, unsigned int>& mode6CC = {{-423, 1}, {2212, 1}, {-2212, 1}, {211, 1}};
  static const map<PdgId, unsigned int>& mode7 = {{421, 1}, {2212, 1}, {-2212, 1}, {211, 1}, {-211, 1}};
  static const map<PdgId, unsigned int>& mode7CC = {{-421, 1},
                                                    {2212, 1},
                                                    {-2212, 1},
                                                    {211, 1},
                                                    {-211, 1}};
  static const map<PdgId, unsigned int>& mode8 = {{423, 1}, {2212, 1}, {-2212, 1}, {211, 1}, {-211, 1}};
  static const map<PdgId, unsigned int>& mode8CC = {{-423, 1},
                                                    {2212, 1},
                                                    {-2212, 1},
                                                    {211, 1},
                                                    {-211, 1}};
  static const map<PdgId, unsigned int>& mode9 = {{411, 1}, {2212, 1}, {-2212, 1}, {211, 2}};
  static const map<PdgId, unsigned int>& mode9CC = {{-411, 1}, {2212, 1}, {-2212, 1}, {211, 2}};
  static const map<PdgId, unsigned int>& mode10 = {{413, 1}, {2212, 1}, {-2212, 1}, {-211, 2}};
  static const map<PdgId, unsigned int>& mode10CC = {{-413, 1}, {2212, 1}, {-2212, 1}, {211, 2}};
  DecayedParticles BB = apply<DecayedParticles>(event, "BB");
  // loop over particles
  for (unsigned int ix = 0; ix < BB.decaying().size(); ++ix) {
    int sign = 1, imode = -1, idd = 421;
    if (BB.decaying()[ix].abspid() == 511) {
      _nB[0]->fill();
      if (BB.decaying()[ix].pid() < 0 && BB.modeMatches(ix, 3, mode1)) {
        sign = 1;
        imode = 0;
        idd = 421;
      }
      else if (BB.decaying()[ix].pid() > 0 && BB.modeMatches(ix, 3, mode1CC)) {
        sign = -1;
        imode = 0;
        idd = 421;
      }
      else if (BB.decaying()[ix].pid() < 0 && BB.modeMatches(ix, 3, mode2)) {
        sign = 1;
        imode = 1;
        idd = 423;
      }
      else if (BB.decaying()[ix].pid() > 0 && BB.modeMatches(ix, 3, mode2CC)) {
        sign = -1;
        imode = 1;
        idd = 423;
      }
      else if (BB.decaying()[ix].pid() < 0 && BB.modeMatches(ix, 4, mode3)) {
        sign = 1;
        imode = 2;
        idd = 411;
      }
      else if (BB.decaying()[ix].pid() > 0 && BB.modeMatches(ix, 4, mode3CC)) {
        sign = -1;
        imode = 2;
        idd = 411;
      }
      else if (BB.decaying()[ix].pid() < 0 && BB.modeMatches(ix, 4, mode4)) {
        sign = 1;
        imode = 3;
        idd = 413;
      }
      else if (BB.decaying()[ix].pid() > 0 && BB.modeMatches(ix, 4, mode4CC)) {
        sign = -1;
        imode = 3;
        idd = 413;
      }
      else if (BB.decaying()[ix].pid() < 0 && BB.modeMatches(ix, 5, mode7)) {
        sign = 1;
        imode = 6;
        idd = 421;
      }
      else if (BB.decaying()[ix].pid() > 0 && BB.modeMatches(ix, 5, mode7CC)) {
        sign = -1;
        imode = 6;
        idd = 421;
      }
      else if (BB.decaying()[ix].pid() < 0 && BB.modeMatches(ix, 5, mode8)) {
        sign = 1;
        imode = 7;
        idd = 423;
      }
      else if (BB.decaying()[ix].pid() > 0 && BB.modeMatches(ix, 5, mode8CC)) {
        sign = -1;
        imode = 7;
        idd = 423;
      }
      else
        continue;
    }
    else {
      _nB[1]->fill();
      if (BB.decaying()[ix].pid() < 0 && BB.modeMatches(ix, 4, mode5)) {
        sign = 1;
        imode = 4;
        idd = 421;
      }
      else if (BB.decaying()[ix].pid() > 0 && BB.modeMatches(ix, 4, mode5CC)) {
        sign = -1;
        imode = 4;
        idd = 421;
      }
      else if (BB.decaying()[ix].pid() < 0 && BB.modeMatches(ix, 4, mode6)) {
        sign = 1;
        imode = 5;
        idd = 423;
      }
      else if (BB.decaying()[ix].pid() > 0 && BB.modeMatches(ix, 4, mode6CC)) {
        sign = -1;
        imode = 5;
        idd = 423;
      }
      else if (BB.decaying()[ix].pid() < 0 && BB.modeMatches(ix, 5, mode9)) {
        sign = 1;
        imode = 8;
        idd = 411;
      }
      else if (BB.decaying()[ix].pid() > 0 && BB.modeMatches(ix, 5, mode9CC)) {
        sign = -1;
        imode = 8;
        idd = 411;
      }
      else if (BB.decaying()[ix].pid() < 0 && BB.modeMatches(ix, 5, mode10)) {
        sign = 1;
        imode = 9;
        idd = 413;
      }
      else if (BB.decaying()[ix].pid() > 0 && BB.modeMatches(ix, 5, mode10CC)) {
        sign = -1;
        imode = 9;
        idd = 413;
      }
      else
        continue;
    }
    const Particle& DD = BB.decayProducts()[ix].at(sign * idd)[0];
    const Particle& pp = BB.decayProducts()[ix].at(sign * 2212)[0];
    const Particle& pbar = BB.decayProducts()[ix].at(-sign * 2212)[0];
    double mppbar = (pp.momentum() + pbar.momentum()).mass();
    double mpD = (pp.momentum() + DD.momentum()).mass();
    if (imode == 0) {
      if (sqr(mppbar) > 5.)
        _h[0][0]->fill(mpD);
      else
        _h[0][1]->fill(mpD);
      if (sqr(mpD) > 9.)
        _h[0][2]->fill(mppbar);
      else
        _h[0][3]->fill(mppbar);
    }
    else if (imode == 1) {
      if (sqr(mppbar) > 5.)
        _h[1][0]->fill(mpD);
      else
        _h[1][1]->fill(mpD);
      if (sqr(mpD) > 10.5)
        _h[1][2]->fill(mppbar);
      else
        _h[1][3]->fill(mppbar);
    }
    else {
      _h[imode][0]->fill(mppbar);
      _h[imode][1]->fill((pbar.momentum() + DD.momentum()).mass());
      _h[imode][2]->fill(mpD);
      const Particles& pim = BB.decayProducts()[ix].at(-sign * 211);
      for (unsigned int iy = 0; iy < pim.size(); ++iy) {
        _h[imode][3]->fill((pp.momentum() + pim[iy].momentum()).mass());
      }
      if (imode == 6 || imode == 7) {
        const Particle& pip = BB.decayProducts()[ix].at(sign * 211)[0];
        _h[imode][3]->fill((pp.momentum() + pip.momentum()).mass());
      }
    }
  }
}


/// Normalise histograms etc., after the run
void finalize() {
  for (unsigned int ix = 0; ix < 10; ++ix) {
    CounterPtr temp = (ix < 4 || ix == 6 || ix == 7) ? _nB[0] : _nB[1];
    for (unsigned int iy = 0; iy < 4; ++iy) {
      if (iy == 3 && ix > 5)
        scale(_h[ix][iy], 0.5e5 / *temp);
      else
        scale(_h[ix][iy], 1e5 / *temp);
    }
  }
}

/// @}


/// @name Histograms
/// @{
Histo1DPtr _h[10][4];
CounterPtr _nB[2];
/// @}

};

RIVET_DECLARE_PLUGIN(BABAR_2012_I946659);

} ```