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Rivet analyses reference
BELLE_2015_I1326905
Mass distributions in the decays $B^0\to D^-_sK^0_S\pi^+$ and $B^+\to D^-_sK^+K^+$
Experiment: BELLE (KEKB)
Inspire ID: 1326905
Status: VALIDATED NOHEPDATA
Authors:
References:
- Phys.Rev.D 91 (2015) 3, 032008
Beams: * *
Beam energies: ANY
Run details:
- Any process producing B0 and B+, originally Upsilon(4S) decays
Mass distributions in the decays $B^0\to D^-_sK^0_S\pi^+$ and $B^+\to D^-_sK^+K^+$, the data were read from the plots in the paper and although the backgrounds have been subtracted they may be be correct for efficiency.
Source code:
BELLE_2015_I1326905.cc
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99 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief B0 ->\to Ds- KS0 pi+ and B+ -> Ds- K+ K^+
class BELLE_2015_I1326905 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2015_I1326905);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
UnstableParticles ufs = UnstableParticles(Cuts::abspid==511 or Cuts::abspid==521);
declare(ufs, "UFS");
DecayedParticles BB(ufs);
BB.addStable( 431);
BB.addStable(-431);
BB.addStable( 310);
declare(BB, "BB");
//histograms
for(unsigned int ix=0;ix<2;++ix) {
book(_h[ix],1,1,1+ix);
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId,unsigned int> & mode1 = { {-431,1},{ 310,1}, { 211,1}};
static const map<PdgId,unsigned int> & mode1CC = { { 431,1},{ 310,1}, {-211,1}};
static const map<PdgId,unsigned int> & mode2 = { {-431,1},{ 321,2}};
static const map<PdgId,unsigned int> & mode2CC = { { 431,1},{-321,2}};
DecayedParticles BB = apply<DecayedParticles>(event, "BB");
for(unsigned int ix=0;ix<BB.decaying().size();++ix) {
int sign = 1, imode = 0;
if (BB.decaying()[ix].pid()>0 && BB.modeMatches(ix,3,mode1)) {
imode=0;
sign=1;
}
else if (BB.decaying()[ix].pid()<0 && BB.modeMatches(ix,3,mode1CC)) {
imode=0;
sign=-1;
}
else if (BB.decaying()[ix].pid()>0 && BB.modeMatches(ix,3,mode2)) {
imode=1;
sign=1;
}
else if (BB.decaying()[ix].pid()<0 && BB.modeMatches(ix,3,mode2CC)) {
imode=1;
sign=-1;
}
else
continue;
const Particle & Ds = BB.decayProducts()[ix].at(-sign*431)[0];
FourMomentum pK;
if(imode==0) {
pK = BB.decayProducts()[ix].at(310)[0].momentum();
}
else {
const Particles & Kp = BB.decayProducts()[ix].at(sign*321);
pK = Kp[0].momentum().p3().mod()>Kp[1].momentum().p3().mod() ?
Kp[1].momentum() : Kp[0].momentum();
}
_h[imode]->fill((Ds.momentum()+pK).mass());
}
}
/// Normalise histograms etc., after the run
void finalize() {
for(unsigned int ix=0;ix<2;++ix) {
normalize(_h[ix], 1., false);
}
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h[2];
/// @}
};
RIVET_DECLARE_PLUGIN(BELLE_2015_I1326905);
}
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