Rivet analyses
Mass distributions in B → D(*)pp̄ + 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 → D(*)pp̄ + 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++ -*-
#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);
}