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320 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief D0/D+ to pions
class BESIII_2022_I2102455 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BESIII_2022_I2102455);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
UnstableParticles ufs = UnstableParticles(Cuts::abspid==411 or Cuts::abspid==421);
declare(ufs, "UFS");
DecayedParticles DD(ufs);
DD.addStable(PID::PI0);
DD.addStable(PID::K0S);
declare(DD, "DD");
// histograms
vector<unsigned int> nHist = {3,7,9,14,2,2,5,4,11};
for(unsigned int ix=0;ix<9;++ix) {
_h.push_back(vector<Histo1DPtr>());
for(unsigned int iy=0;iy<nHist[ix];++iy) {
Histo1DPtr tmp;
book(tmp,ix+1,1,iy+1);
_h[ix].push_back(tmp);
}
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// define the decay mode
static const map<PdgId,unsigned int> & mode1 = { { 211,1}, { -211,1}, { 111,1} };
static const map<PdgId,unsigned int> & mode2 = { { 211,1}, { -211,1}, { 111,2} };
static const map<PdgId,unsigned int> & mode3 = { { 211,2}, { -211,2}, { 111,1} };
static const map<PdgId,unsigned int> & mode4 = { { 211,2}, { -211,2}, { 111,2} };
static const map<PdgId,unsigned int> & mode5 = { { 211,2}, { -211,1}};
static const map<PdgId,unsigned int> & mode5CC = { { 211,1}, { -211,2}};
static const map<PdgId,unsigned int> & mode6 = { { 211,1}, { 111,2}};
static const map<PdgId,unsigned int> & mode6CC = { {-211,1}, { 111,2}};
static const map<PdgId,unsigned int> & mode7 = { { 211,2}, { -211,1}, { 111,1} };
static const map<PdgId,unsigned int> & mode7CC = { { 211,1}, { -211,2}, { 111,1} };
static const map<PdgId,unsigned int> & mode8 = { { 211,3}, { -211,2}};
static const map<PdgId,unsigned int> & mode8CC = { { 211,2}, { -211,3}};
static const map<PdgId,unsigned int> & mode9 = { { 211,3}, { -211,2}, { 111,1} };
static const map<PdgId,unsigned int> & mode9CC = { { 211,2}, { -211,3}, { 111,1} };
DecayedParticles DD = apply<DecayedParticles>(event, "DD");
// loop over particles
for(unsigned int ix=0;ix<DD.decaying().size();++ix) {
int sign = DD.decaying()[ix].pid()/DD.decaying()[ix].abspid();
// D0 -> pi+ pi- pi0
if ( DD.modeMatches(ix,3,mode1)) {
const Particles & pip = DD.decayProducts()[ix].at( sign*211);
const Particles & pim = DD.decayProducts()[ix].at(-sign*211);
const Particles & pi0 = DD.decayProducts()[ix].at( 111);
// KS0 veto
double mpm = (pip[0].momentum()+pim[0].momentum()).mass();
if(mpm>.468 && mpm<.528) continue;
_h[0][0]->fill((pip[0].momentum()+pi0[0].momentum()).mass());
_h[0][1]->fill((pim[0].momentum()+pi0[0].momentum()).mass());
_h[0][2]->fill(mpm);
}
// D0 -> pi+ pi- 2pi0
else if ( DD.modeMatches(ix,4,mode2)) {
const Particles & pip = DD.decayProducts()[ix].at( sign*211);
const Particles & pim = DD.decayProducts()[ix].at(-sign*211);
const Particles & pi0 = DD.decayProducts()[ix].at( 111);
// KS0 veto
FourMomentum ppm = pip[0].momentum()+pim[0].momentum();
double mpm = ppm.mass();
if(mpm>.468 && mpm<.528) continue;
FourMomentum p00 = pi0[0].momentum()+pi0[1].momentum();
double m00 = p00.mass();
if(m00>.428 && m00<.548) continue;
_h[1][0]->fill((pip[0].momentum()+pi0[0].momentum()).mass());
_h[1][0]->fill((pip[0].momentum()+pi0[1].momentum()).mass());
_h[1][1]->fill((pim[0].momentum()+pi0[0].momentum()).mass());
_h[1][1]->fill((pim[0].momentum()+pi0[1].momentum()).mass());
_h[1][2]->fill(mpm);
_h[1][3]->fill((pi0[0].momentum()+pi0[1].momentum()).mass());
_h[1][4]->fill((p00+pip[0].momentum()).mass());
_h[1][5]->fill((p00+pim[0].momentum()).mass());
_h[1][6]->fill((ppm+pi0[0].momentum()).mass());
_h[1][6]->fill((ppm+pi0[1].momentum()).mass());
}
// D0 -> 2pi+ 2pi- pi0
else if ( DD.modeMatches(ix,5,mode3)) {
const Particles & pip = DD.decayProducts()[ix].at( sign*211);
const Particles & pim = DD.decayProducts()[ix].at(-sign*211);
const Particles & pi0 = DD.decayProducts()[ix].at( 111);
// pi+ pi- masses and KS0 veto
double mpm[4];
bool veto=false;
for(unsigned int ix=0;ix<2;++ix) {
for(unsigned int iy=0;iy<2;++iy) {
mpm[2*ix+iy] = (pip[ix].momentum()+pim[iy].momentum()).mass();
if(mpm[2*ix+iy]>.468 && mpm[2*ix+iy]<.528) veto=true;
}
}
if(veto) continue;
// fill the histograms
FourMomentum ppp = pip[0].momentum()+pip[1].momentum();
FourMomentum pmm = pim[0].momentum()+pim[1].momentum();
for(unsigned int ix=0;ix<2;++ix) {
_h[2][0]->fill((pip[ix].momentum()+pi0[0].momentum()).mass());
_h[2][1]->fill((pim[ix].momentum()+pi0[0].momentum()).mass());
_h[2][3]->fill((ppp+pim[ix].momentum()).mass());
_h[2][4]->fill((pmm+pip[ix].momentum()).mass());
_h[2][6]->fill((ppp+pim[ix].momentum()+pi0[0].momentum()).mass());
_h[2][7]->fill((pmm+pip[ix].momentum()+pi0[0].momentum()).mass());
for(unsigned int iy=0;iy<2;++iy) {
_h[2][2]->fill(mpm[2*ix+iy]);
_h[2][5]->fill((pip[ix].momentum()+pim[iy].momentum()+pi0[0].momentum()).mass());
}
}
_h[2][8]->fill((ppp+pmm).mass());
}
// D0 -> 2pi+ 2pi- pi0
else if ( DD.modeMatches(ix,6,mode4)) {
const Particles & pip = DD.decayProducts()[ix].at( sign*211);
const Particles & pim = DD.decayProducts()[ix].at(-sign*211);
const Particles & pi0 = DD.decayProducts()[ix].at( 111);
// pi+ pi- masses and KS0 veto
double mpm[4];
bool veto=false;
for(unsigned int ix=0;ix<2;++ix) {
for(unsigned int iy=0;iy<2;++iy) {
mpm[2*ix+iy] = (pip[ix].momentum()+pim[iy].momentum()).mass();
if(mpm[2*ix+iy]>.468 && mpm[2*ix+iy]<.528) veto=true;
}
}
if(veto) continue;
FourMomentum p00 = pi0[0].momentum()+pi0[1].momentum();
double m00 = p00.mass();
if(m00>.428 && m00<.548) continue;
// fill the histograms
_h[3][3]->fill(m00);
FourMomentum ppp = pip[0].momentum()+pip[1].momentum();
FourMomentum pmm = pim[0].momentum()+pim[1].momentum();
for(unsigned int ix=0;ix<2;++ix) {
for(unsigned int i0=0;i0<2;++i0) {
_h[3][ 0]->fill((pip[ix].momentum()+pi0[i0].momentum()).mass());
_h[3][ 1]->fill((pim[ix].momentum()+pi0[i0].momentum()).mass());
_h[3][ 7]->fill((ppp+pim[ix].momentum()+pi0[i0].momentum()).mass());
_h[3][ 8]->fill((pmm+pip[ix].momentum()+pi0[i0].momentum()).mass());
_h[3][11]->fill((ppp+pim[ix].momentum()+p00).mass());
_h[3][12]->fill((pmm+pip[ix].momentum()+p00).mass());
_h[3][13]->fill((pmm+pi0[ix].momentum()+ppp).mass());
for(unsigned int iy=0;iy<2;++iy)
_h[3][6]->fill((pip[ix].momentum()+pim[iy].momentum()+pi0[i0].momentum()).mass());
}
_h[3][4]->fill((ppp+pim[ix].momentum()).mass());
_h[3][5]->fill((pmm+pip[ix].momentum()).mass());
for(unsigned int iy=0;iy<2;++iy) {
_h[3][ 2]->fill(mpm[2*ix+iy]);
_h[3][10]->fill((pip[ix].momentum()+pim[iy].momentum()+p00).mass());
}
}
_h[3][9]->fill((ppp+pmm).mass());
}
// D+ -> 2pi+ pi-
else if ( DD.modeMatches(ix,3,mode5 ) ||
DD.modeMatches(ix,3,mode5CC)) {
const Particles & pip = DD.decayProducts()[ix].at( sign*211);
const Particles & pim = DD.decayProducts()[ix].at(-sign*211);
// pi+ pi- masses and KS0 veto
double mpm[2];
bool veto=false;
for(unsigned int ix=0;ix<2;++ix) {
mpm[ix] = (pip[ix].momentum()+pim[0].momentum()).mass();
if(mpm[ix]>.468 && mpm[ix]<.528) veto=true;
}
if(veto) continue;
_h[4][0]->fill((pip[0].momentum()+pip[1].momentum()).mass());
for(unsigned int ix=0;ix<2;++ix) {
_h[4][1]->fill(mpm[ix]);
}
}
// D+ -> pi+ 2pi0
else if ( DD.modeMatches(ix,3,mode6 ) ||
DD.modeMatches(ix,3,mode6CC)) {
const Particles & pip = DD.decayProducts()[ix].at( sign*211);
const Particles & pi0 = DD.decayProducts()[ix].at( 111);
FourMomentum p00 = pi0[0].momentum()+pi0[1].momentum();
double m00 = p00.mass();
if(m00>.428 && m00<.548) continue;
// fill the histograms
_h[5][1]->fill(m00);
for(unsigned int ix=0;ix<2;++ix) {
_h[5][0]->fill((pip[0].momentum()+pi0[ix].momentum()).mass());
}
}
// D+ -> 2pi+ pi- pi0
else if ( DD.modeMatches(ix,4,mode7 ) ||
DD.modeMatches(ix,4,mode7CC)) {
const Particles & pip = DD.decayProducts()[ix].at( sign*211);
const Particles & pim = DD.decayProducts()[ix].at(-sign*211);
const Particles & pi0 = DD.decayProducts()[ix].at( 111);
// pi+ pi- masses and KS0 veto
double mpm[2];
bool veto=false;
for(unsigned int ix=0;ix<2;++ix) {
mpm[ix] = (pip[ix].momentum()+pim[0].momentum()).mass();
if(mpm[ix]>.468 && mpm[ix]<.528) veto=true;
}
if(veto) continue;
_h[6][1]->fill((pim[0].momentum()+pi0[0].momentum()).mass());
_h[6][3]->fill((pim[0].momentum()+pip[0].momentum()+pip[1].momentum()).mass());
for(unsigned int ix=0;ix<2;++ix) {
_h[6][0]->fill((pip[ix].momentum()+pi0[0].momentum()).mass());
_h[6][2]->fill(mpm[ix]);
_h[6][4]->fill((pip[ix].momentum()+pim[0].momentum()+pi0[0].momentum()).mass());
}
}
// D+ -> 3pi+ 2pi-
else if ( DD.modeMatches(ix,5,mode8 ) ||
DD.modeMatches(ix,5,mode8CC)) {
const Particles & pip = DD.decayProducts()[ix].at( sign*211);
const Particles & pim = DD.decayProducts()[ix].at(-sign*211);
// pi+ pi- masses and KS0 veto
double mpm[3][2];
bool veto=false;
for(unsigned int ix=0;ix<3;++ix) {
for(unsigned int iy=0;iy<2;++iy) {
mpm[ix][iy] = (pip[ix].momentum()+pim[iy].momentum()).mass();
if(mpm[ix][iy]>.468 && mpm[ix][iy]<.528) veto=true;
}
}
if(veto) continue;
FourMomentum pppp = pip[0].momentum()+pip[1].momentum()+pip[2].momentum();
FourMomentum pmm = pim[0].momentum()+pim[1].momentum();
for(unsigned int ix=0;ix<3;++ix) {
_h[7][2]->fill((pmm+pip[ix].momentum()).mass());
for(unsigned int iy=0;iy<2;++iy) {
_h[7][0]->fill(mpm[ix][iy]);
_h[7][1]->fill((pppp-pip[ix].momentum()+pim[iy].momentum()).mass());
}
}
for(unsigned int iy=0;iy<2;++iy)
_h[7][3]->fill((pppp+pim[iy].momentum()).mass());
}
// D+ -> 3pi+ 2pi- pi0
else if ( DD.modeMatches(ix,6,mode9 ) ||
DD.modeMatches(ix,6,mode9CC)) {
const Particles & pip = DD.decayProducts()[ix].at( sign*211);
const Particles & pim = DD.decayProducts()[ix].at(-sign*211);
const Particles & pi0 = DD.decayProducts()[ix].at( 111);
// pi+ pi- masses and KS0 veto
double mpm[3][2];
bool veto=false;
for(unsigned int ix=0;ix<3;++ix) {
for(unsigned int iy=0;iy<2;++iy) {
mpm[ix][iy] = (pip[ix].momentum()+pim[iy].momentum()).mass();
if(mpm[ix][iy]>.468 && mpm[ix][iy]<.528) veto=true;
}
}
if(veto) continue;
FourMomentum pppp = pip[0].momentum()+pip[1].momentum()+pip[2].momentum();
FourMomentum pmm = pim[0].momentum()+pim[1].momentum();
FourMomentum pcharged = pppp+pmm;
_h[8][9]->fill(pcharged.mass());
for(unsigned int ix=0;ix<3;++ix) {
_h[8][0]->fill((pip[ix].momentum()+pi0[0].momentum()).mass());
FourMomentum pmmp = (pmm+pip[ix].momentum());
_h[8][ 4]->fill(pmmp.mass());
_h[8][ 7]->fill((pmmp+pi0[0].momentum()).mass());
_h[8][ 8]->fill((pcharged-pip[ix].momentum()).mass());
_h[8][10]->fill((pcharged-pip[ix].momentum()+pi0[0].momentum()).mass());
for(unsigned int iy=0;iy<2;++iy) {
_h[8][2]->fill(mpm[ix][iy]);
FourMomentum pppm = (pppp-pip[ix].momentum()+pim[iy].momentum());
_h[8][3]->fill(pppm.mass());
_h[8][6]->fill((pppm+pi0[0].momentum()).mass());
_h[8][5]->fill((pip[ix].momentum()+pim[iy].momentum()+pi0[0].momentum()).mass());
}
}
for(unsigned int iy=0;iy<2;++iy) {
_h[8][1]->fill((pim[iy].momentum()+pi0[0].momentum()).mass());
}
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
for(unsigned int ix=0;ix<_h.size();++ix) {
for(unsigned int iy=0;iy<_h[ix].size();++iy) {
normalize(_h[ix][iy]);
}
}
}
/// @}
/// @name Histograms
/// @{
vector<vector<Histo1DPtr> > _h;
/// @}
};
RIVET_DECLARE_PLUGIN(BESIII_2022_I2102455);
}
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