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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/Thrust.hh"
namespace Rivet {
/// @brief Single and di-hadron spectra
class BELLE_2020_I1777678 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2020_I1777678);
/// @name Analysis methods
///@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(ChargedFinalState(Cuts::abspid==211 or Cuts::abspid==321 or Cuts::abspid==2212),"CFS");
// projections
FinalState fs;
declare(fs,"FS");
declare(Thrust(fs),"Thrust");
// single particle hists
vector<int> pdg={211,321,2212};
for(unsigned int ix=0;ix<3;++ix) {
book(_s_all [pdg[ix]],1,ix+1,1);
book(_s_strong[pdg[ix]],1,ix+1,2);
}
// dihadron histograms
double bins[17]={0.20,0.25,0.30,0.35,0.40,0.45,0.50,0.55,0.60,
0.65,0.70,0.75,0.80,0.85,0.90,0.95,1.00};
unsigned int i0=1;
for(unsigned int defn=0;defn<3;++defn) {
for(unsigned int hemi=0;hemi<3;++hemi) {
for(unsigned int ip=0;ip<6;++ip) {
i0+=1;
unsigned int ymax=16;
if(i0==7 || i0==19) ymax=15;
else if(i0>=8 && i0<=12) ymax=14;
else if(i0==13) ymax=13;
else if(i0==26) ymax=10;
else if(i0==27||i0==30) ymax= 9;
else if(i0==28) ymax= 7;
else if(i0==29) ymax= 8;
else if(i0==31||i0==44) ymax= 6;
else if(i0==45||i0==48) ymax= 5;
else if(i0==46||i0==47) ymax= 4;
else if(i0==49 ) ymax= 3;
for(unsigned int iy=0;iy<ymax;++iy) {
Histo1DPtr temp;
book(temp,i0,1,iy+1);
_d_all [ip][defn][hemi].add(bins[iy],bins[iy+1],temp);
book(temp,i0,2,iy+1);
_d_strong[ip][defn][hemi].add(bins[iy],bins[iy+1],temp);
}
}
}
}
}
bool isWeak(const Particle & p) {
bool weak = false;
if(p.parents().empty()) return weak;
Particle parent = p.parents()[0];
while (!parent.parents().empty()) {
if(parent.abspid()==411 || parent.abspid()==421 || parent.abspid()==431 ||
parent.abspid()==4122 || parent.abspid()==4232 || parent.abspid()==4132 ||
parent.abspid()==4332) {
weak=true;
break;
}
parent = parent.parents()[0];
}
return weak;
}
void fillHistos(int ip,bool strong,bool same,bool opp,
const Particle & p1, const Particle & p2) {
for(unsigned int def=0;def<3;++def) {
double z1 = 0., z2 = 0.;
if(def==0) {
z1 = 2.*p1.momentum().t()/sqrtS();
z2 = 2.*p2.momentum().t()/sqrtS();
}
else if(def==1) {
z1 = 2.*p1.momentum().t()/sqrtS();
z2 = (p1.momentum()*p2.momentum())/p1.momentum().t()/sqrtS();
}
else if(def==2) {
double p1p2 = p1.momentum()*p2.momentum();
double p1q = p1.momentum().t()*sqrtS();
double p2q = p2.momentum().t()*sqrtS();
z1 = (p1p2-p1.mass2()*p2.mass2()/p1p2)/(p2q-p2.mass2()*p1q/p1p2);
z2 = (p1p2-p1.mass2()*p2.mass2()/p1p2)/(p1q-p1.mass2()*p2q/p1p2);
}
_d_all[ip][def][0].fill(z1,z2,0.5);
if(strong) _d_strong[ip][def][0].fill(z1,z2,0.5);
if(same) {
_d_all[ip][def][1].fill(z1,z2,0.5);
if(strong) _d_strong[ip][def][1].fill(z1,z2,0.5);
}
if(opp) {
_d_all[ip][def][2].fill(z1,z2,0.5);
if(strong) _d_strong[ip][def][2].fill(z1,z2,0.5);
}
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// apply projection
const ChargedFinalState& cfs = apply<ChargedFinalState>(event, "CFS");
// fill single particle histos
for (const Particle& p : cfs.particles()) {
const double z = 2.*p.momentum().t()/sqrtS();
_s_all [p.abspid()]->fill(z);
if(!isWeak(p)) _s_strong[p.abspid()]->fill(z);
}
// get thrust
const Thrust thrust = apply<Thrust>(event,"Thrust");
ThreeVector axis = thrust.thrustAxis();
Particles piK = cfs.particles(Cuts::abspid==PID::KPLUS or
Cuts::abspid==PID::PIPLUS);
for(unsigned int ix=0;ix<piK.size();++ix) {
double dot1 = axis.dot(piK[ix].momentum().p3());
bool weak1 = isWeak(piK[ix]);
for(unsigned int iy=0;iy<piK.size();++iy) {
if(ix==iy) continue;
double dot2 = axis.dot(piK[iy].momentum().p3());
bool weak2 = isWeak(piK[iy]);
bool strong = !weak1 && !weak2;
bool same = thrust.thrust()>0.8 && dot1*dot2>0.;
bool opp = thrust.thrust()>0.8 && dot1*dot2<0.;
unsigned int ip=0;
if(piK[ix].pid()==PID::PIPLUS) {
if(piK[iy].pid()==PID::PIPLUS) ip=1;
else if(piK[iy].pid()==PID::PIMINUS) ip=0;
else if(piK[iy].pid()==PID::KPLUS ) ip=3;
else if(piK[iy].pid()==PID::KMINUS) ip=2;
}
else if(piK[ix].pid()==PID::PIMINUS) {
if(piK[iy].pid()==PID::PIPLUS) ip=0;
else if(piK[iy].pid()==PID::PIMINUS) ip=1;
else if(piK[iy].pid()==PID::KPLUS ) ip=2;
else if(piK[iy].pid()==PID::KMINUS ) ip=3;
}
else if(piK[ix].pid()==PID::KPLUS) {
if(piK[iy].pid()==PID::PIPLUS) ip=3;
else if(piK[iy].pid()==PID::PIMINUS) ip=2;
else if(piK[iy].pid()==PID::KPLUS) ip=5;
else if(piK[iy].pid()==PID::KMINUS) ip=4;
}
else if(piK[ix].pid()==PID::KMINUS) {
if(piK[iy].pid()==PID::PIPLUS) ip=2;
else if(piK[iy].pid()==PID::PIMINUS) ip=3;
else if(piK[iy].pid()==PID::KPLUS) ip=4;
else if(piK[iy].pid()==PID::KMINUS) ip=5;
}
fillHistos(ip,strong,same,opp,piK[ix],piK[iy]);
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
for (const auto& kv : _s_all)
scale(kv.second,crossSection()/femtobarn/sumOfWeights());
for (const auto& kv : _s_strong)
scale(kv.second,crossSection()/femtobarn/sumOfWeights());
for(unsigned int ix=0;ix<6;++ix) {
for(unsigned int iy=0;iy<3;++iy) {
for(unsigned int iz=0;iz<3;++iz) {
_d_all [ix][iy][iz].scale(crossSection()/femtobarn/sumOfWeights(),this);
_d_strong[ix][iy][iz].scale(crossSection()/femtobarn/sumOfWeights(),this);
}
}
}
}
///@}
/// @name Histograms
///@{
map<int,Histo1DPtr> _s_all,_s_strong;
BinnedHistogram _d_all[6][3][3],_d_strong[6][3][3];
///@}
};
RIVET_DECLARE_PLUGIN(BELLE_2020_I1777678);
}
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