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/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.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);
}