Rivet analyses

title: BABAR_2012_I1111233

Differential Branching ratio and asymmetries in $B\to K^{(*)}\ell^+\ell^-$

Experiment: BABAR (PEP-II)

Inspire ID: 1111233

Status: VALIDATED NOHEPDATA SINGLEWEIGHT

Authors: - Peter Richardson

References: - Phys.Rev.D 86 (2012) 032012

Beams: * *

Beam energies: ANY

Run details: - Any proces producing B0 and B+, originally Upsilon(4S) decays

Measurement of the differential Branching ratio and asymmetries in $B\to K^{(*)}\ell^+\ell^-$. As well as the differential branching ratio as a function of $q^2$ the ratio of $e^+e^-$ and $\mu^+\mu^-$ and isospin and CP asymmetries are measured.

Source code:BABAR_2012_I1111233.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/DecayedParticles.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief B -> K(*) l+ l- class BABAR_2012_I1111233 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2012_I1111233);


/// @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(443);
  BB.addStable(100443);
  BB.addStable(310);
  BB.addStable(313);
  BB.addStable(323);
  BB.addStable(-313);
  BB.addStable(-323);
  declare(BB, "BB");
  // histograms
  for (unsigned int ix = 0; ix < 2; ++ix) {
    for (unsigned int iy = 0; iy < 2; ++iy) {
      book(_h_br[ix][iy], 1, 1 + ix, 1 + iy);
      book(_p_CP[ix][iy], 2, 1 + ix, 1 + iy);
      for (unsigned int il = 0; il < 2; ++il) {
        book(_h_br_l[il][ix][iy], "TMP/h_br_l_" + toString(il) + "_" + toString(ix) + "_" + toString(iy),
             refData(3, 1 + ix, 1 + iy));
        book(_h_br_I[il][ix][iy], "TMP/h_br_I_" + toString(il) + "_" + toString(ix) + "_" + toString(iy),
             refData(4, 1 + ix, 1 + iy));
      }
    }
  }
  for (unsigned int ix = 0; ix < 3; ++ix) book(_c[ix], "TMP/c_" + toString(ix + 1));
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  // kaon modes
  static const map<PdgId, unsigned int>& mode1 = {{321, 1}, {13, 1}, {-13, 1}};
  static const map<PdgId, unsigned int>& mode1CC = {{-321, 1}, {13, 1}, {-13, 1}};
  static const map<PdgId, unsigned int>& mode2 = {{310, 1}, {13, 1}, {-13, 1}};
  static const map<PdgId, unsigned int>& mode3 = {{321, 1}, {11, 1}, {-11, 1}};
  static const map<PdgId, unsigned int>& mode3CC = {{-321, 1}, {11, 1}, {-11, 1}};
  static const map<PdgId, unsigned int>& mode4 = {{310, 1}, {11, 1}, {-11, 1}};
  // K* modes
  static const map<PdgId, unsigned int>& mode5 = {{323, 1}, {13, 1}, {-13, 1}};
  static const map<PdgId, unsigned int>& mode5CC = {{-323, 1}, {13, 1}, {-13, 1}};
  static const map<PdgId, unsigned int>& mode6 = {{313, 1}, {13, 1}, {-13, 1}};
  static const map<PdgId, unsigned int>& mode6CC = {{-313, 1}, {13, 1}, {-13, 1}};
  static const map<PdgId, unsigned int>& mode7 = {{323, 1}, {11, 1}, {-11, 1}};
  static const map<PdgId, unsigned int>& mode7CC = {{-323, 1}, {11, 1}, {-11, 1}};
  static const map<PdgId, unsigned int>& mode8 = {{313, 1}, {11, 1}, {-11, 1}};
  static const map<PdgId, unsigned int>& mode8CC = {{-313, 1}, {11, 1}, {-11, 1}};
  DecayedParticles BB = apply<DecayedParticles>(event, "BB");
  // loop over particles
  for (unsigned int ix = 0; ix < BB.decaying().size(); ++ix) {
    _c[0]->fill();
    if (BB.decaying()[ix].abspid() == 521)
      _c[1]->fill();
    else
      _c[2]->fill();
    int imode = 0;
    if ((BB.decaying()[ix].pid() > 0 && BB.modeMatches(ix, 3, mode1))
        || (BB.decaying()[ix].pid() < 0 && BB.modeMatches(ix, 3, mode1CC)))
      imode = 0;
    else if (BB.modeMatches(ix, 3, mode2))
      imode = 1;
    else if ((BB.decaying()[ix].pid() > 0 && BB.modeMatches(ix, 3, mode3))
             || (BB.decaying()[ix].pid() < 0 && BB.modeMatches(ix, 3, mode3CC)))
      imode = 2;
    else if (BB.modeMatches(ix, 3, mode4))
      imode = 3;
    else if ((BB.decaying()[ix].pid() > 0 && BB.modeMatches(ix, 3, mode5))
             || (BB.decaying()[ix].pid() < 0 && BB.modeMatches(ix, 3, mode5CC)))
      imode = 4;
    else if ((BB.decaying()[ix].pid() > 0 && BB.modeMatches(ix, 3, mode6))
             || (BB.decaying()[ix].pid() < 0 && BB.modeMatches(ix, 3, mode6CC)))
      imode = 5;
    else if ((BB.decaying()[ix].pid() > 0 && BB.modeMatches(ix, 3, mode7))
             || (BB.decaying()[ix].pid() < 0 && BB.modeMatches(ix, 3, mode7CC)))
      imode = 6;
    else if ((BB.decaying()[ix].pid() > 0 && BB.modeMatches(ix, 3, mode8))
             || (BB.decaying()[ix].pid() < 0 && BB.modeMatches(ix, 3, mode8CC)))
      imode = 7;
    else
      continue;
    int il = imode < 2 || imode == 4 || imode == 5 ? 13 : 11;
    const Particle& lp = BB.decayProducts()[ix].at(-il)[0];
    const Particle& lm = BB.decayProducts()[ix].at(il)[0];
    double qq = (lp.momentum() + lm.momentum()).mass2();
    double ACP = BB.decaying()[ix].pid() > 0 ? -1. : 1.;
    if (imode < 4) {
      double wgt = (imode == 1 || imode == 3) ? 2 : 1;
      for (unsigned int iy = 0; iy < 2; ++iy) {
        _h_br[iy][0]->fill(qq, wgt);
        _p_CP[iy][0]->fill(qq, ACP, wgt);
        if (il == 13)
          _h_br_l[0][iy][0]->fill(qq, wgt);
        else
          _h_br_l[1][iy][0]->fill(qq, wgt);
        if (BB.decaying()[ix].abspid() == 521)
          _h_br_I[0][iy][0]->fill(qq, wgt);
        else
          _h_br_I[1][iy][0]->fill(qq, wgt);
      }
    }
    else {
      for (unsigned int iy = 0; iy < 2; ++iy) {
        _h_br[iy][1]->fill(qq);
        _p_CP[iy][1]->fill(qq, ACP);
        if (BB.decaying()[ix].abspid() == 521)
          _h_br_I[0][iy][1]->fill(qq);
        else
          _h_br_I[1][iy][1]->fill(qq);
        if (il == 13)
          _h_br_l[0][iy][1]->fill(qq);
        else
          _h_br_l[1][iy][1]->fill(qq);
      }
    }
  }
}


/// Normalise histograms etc., after the run
void finalize() {
  // ratio of lifetimes
  double rLife = 1. / 1.078;
  for (unsigned int ix = 0; ix < 2; ++ix) {
    for (unsigned int iy = 0; iy < 2; ++iy) {
      scale(_h_br[ix][iy], 1e7 / *_c[0]);
      for (unsigned int il = 0; il < 2; ++il) {
        scale(_h_br_l[il][ix][iy], 1e7 / *_c[0]);
        scale(_h_br_I[il][ix][iy], 1e7 / *_c[il + 1]);
        if (il == 0) scale(_h_br_I[il][ix][iy], rLife);
      }
      // RK plots
      Estimate1DPtr RK;
      book(RK, 3, 1 + ix, 1 + iy);
      divide(_h_br_l[0][ix][iy], _h_br_l[1][ix][iy], RK);
      book(RK, 4, 1 + ix, 1 + iy);
      asymm(_h_br_I[1][ix][iy], _h_br_I[0][ix][iy], RK);
    }
  }
}

/// @}


/// @name Histograms
/// @{
Histo1DPtr _h_br[2][2], _h_br_l[2][2][2], _h_br_I[2][2][2];
Profile1DPtr _p_CP[2][2];
CounterPtr _c[3];
/// @}

};

RIVET_DECLARE_PLUGIN(BABAR_2012_I1111233);

} ```