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142 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief B -> D pi (pi) semileptonic
class BELLE_2022_I2512112 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2022_I2512112);
/// @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);
BB.addStable(PID::PI0);
declare(BB, "BB");
// histograms
for(unsigned int ix=0;ix<3;++ix)
for(unsigned int iy=0;iy<2;++iy)
book(_h[ix][iy],1+ix,1,1+iy);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId,unsigned int> mode1[4] = {{ {-421,1}, {-211,1}, {-11,1}, { 12,1}},
{ { 421,1}, { 211,1}, { 11,1}, {-12,1}},
{ {-421,1}, {-211,1}, {-13,1}, { 14,1}},
{ { 421,1}, { 211,1}, { 13,1}, {-14,1}}};
static const map<PdgId,unsigned int> mode2[4] = {{ {-411,1}, { 211,1}, {-11,1}, { 12,1}},
{ { 411,1}, {-211,1}, { 11,1}, {-12,1}},
{ {-411,1}, { 211,1}, {-13,1}, { 14,1}},
{ { 411,1}, {-211,1}, { 13,1}, {-14,1}}};
static const map<PdgId,unsigned int> mode3[4] = {{ {-423,1}, {-211,1}, {-11,1}, { 12,1}},
{ { 423,1}, { 211,1}, { 11,1}, {-12,1}},
{ {-423,1}, {-211,1}, {-13,1}, { 14,1}},
{ { 423,1}, { 211,1}, { 13,1}, {-14,1}}};
static const map<PdgId,unsigned int> mode4[4] = {{ {-413,1}, { 211,1}, {-11,1}, { 12,1}},
{ { 413,1}, {-211,1}, { 11,1}, {-12,1}},
{ {-413,1}, { 211,1}, {-13,1}, { 14,1}},
{ { 413,1}, {-211,1}, { 13,1}, {-14,1}}};
static const map<PdgId,unsigned int> mode5[4] = {{ {-411,1}, {-211,1}, { 211,1}, {-11,1}, { 12,1}},
{ { 411,1}, {-211,1}, { 211,1}, { 11,1}, {-12,1}},
{ {-411,1}, {-211,1}, { 211,1}, {-13,1}, { 14,1}},
{ { 411,1}, {-211,1}, { 211,1}, { 13,1}, {-14,1}}};
static const map<PdgId,unsigned int> mode6[4] = {{ {-421,1}, {-211,1}, { 211,1}, {-11,1}, { 12,1}},
{ { 421,1}, {-211,1}, { 211,1}, { 11,1}, {-12,1}},
{ {-421,1}, {-211,1}, { 211,1}, {-13,1}, { 14,1}},
{ { 421,1}, {-211,1}, { 211,1}, { 13,1}, {-14,1}}};
// loop over B mesons
DecayedParticles BB = apply<DecayedParticles>(event, "BB");
// loop over particles
for(unsigned int ix=0;ix<BB.decaying().size();++ix) {
for(unsigned int il=0;il<4;++il) {
int iD,iloc1,iloc2;
if ( BB.modeMatches(ix,4,mode1[il]) ) {
iloc1=0;
iloc2=0;
iD=-421;
}
else if ( BB.modeMatches(ix,4,mode2[il]) ) {
iloc1=0;
iloc2=1;
iD=-411;
}
else if ( BB.modeMatches(ix,4,mode3[il]) ) {
iloc1=1;
iloc2=0;
iD=-423;
}
else if ( BB.modeMatches(ix,4,mode4[il]) ) {
iloc1=1;
iloc2=1;
iD=-413;
}
else if ( BB.modeMatches(ix,5,mode5[il]) ) {
iloc1=2;
iloc2=0;
iD=-411;
}
else if ( BB.modeMatches(ix,5,mode6[il]) ) {
iloc1=2;
iloc2=1;
iD=-421;
}
else continue;
int sign = il%2==0 ? 1 : -1;
int ipi = -sign*211;
if(iloc2==1) ipi *=-1;
const Particle & pi1= BB.decayProducts()[ix].at( ipi)[0];
const Particle & DD = BB.decayProducts()[ix].at( iD*sign )[0];
FourMomentum pHad = pi1.momentum()+DD.momentum();
if(iloc1==2) {
const Particle & pi2= BB.decayProducts()[ix].at(-ipi)[0];
pHad += pi2.momentum();
}
double mass = pHad.mass();
if(iloc1==1) mass -=DD.mass();
_h[iloc1][iloc2]->fill(mass);
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
for(unsigned int ix=0;ix<3;++ix)
for(unsigned int iy=0;iy<2;++iy)
normalize(_h[ix][iy],1.,false);
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h[3][2];
/// @}
};
RIVET_DECLARE_PLUGIN(BELLE_2022_I2512112);
}
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