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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief Cross section for D+D- pi+ pi- (D1 D and psi(3770) pi+pi- subprocesses)
class BESIII_2019_I1756876 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BESIII_2019_I1756876);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(FinalState(), "FS");
declare(UnstableParticles(), "UFS");
// Book histograms
book(_nD1D, "/TMP/nD1D");
book(_nPsi, "/TMP/nPsi");
}
void findChildren(const Particle & p,map<long,int> & nRes, int &ncount) {
for(const Particle &child : p.children()) {
if(child.children().empty()) {
nRes[child.pid()]-=1;
--ncount;
}
else
findChildren(child,nRes,ncount);
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
const FinalState& fs = apply<FinalState>(event, "FS");
map<long,int> nCount;
int ntotal(0);
for (const Particle& p : fs.particles()) {
nCount[p.pid()] += 1;
++ntotal;
}
const FinalState& ufs = apply<FinalState>(event, "UFS");
bool matched=false;
for(const Particle& p1 : ufs.particles(Cuts::abspid==411)) {
int sign = p1.pid()/411;
map<long,int> nRes = nCount;
int ncount = ntotal;
findChildren(p1,nRes,ncount);
matched=false;
for(const Particle& p2 : ufs.particles(Cuts::pid==-sign*411)) {
map<long,int> nRes2 = nRes;
int ncount2 = ncount;
findChildren(p2,nRes2,ncount2);
if(ncount2!=1) continue;
matched=true;
for(auto const & val : nRes2) {
if(abs(val.first)==211) {
if(val.second!=1) {
matched = false;
break;
}
}
else if(val.second!=0) {
matched = false;
break;
}
}
if(matched) break;
}
if(matched)
break;
}
if(!matched) vetoEvent;
// psi(3770) pi+pi-
for(const Particle& p1 : ufs.particles(Cuts::abspid==30443)) {
if(p1.children().empty()) continue;
map<long,int> nRes = nCount;
int ncount = ntotal;
findChildren(p1,nRes,ncount);
// psi(3770) pi+pi-
if(ncount!=2) continue;
bool matched = true;
for(auto const & val : nRes) {
if(abs(val.first)==211) {
if(val.second !=1) {
matched = false;
break;
}
}
else if(val.second!=0) {
matched = false;
break;
}
}
if(matched) {
_nPsi->fill();
break;
}
}
// D1 D
for(const Particle& p1 : ufs.particles(Cuts::abspid==10413)) {
if(p1.children().empty()) continue;
int sign = p1.pid()/10413;
map<long,int> nRes = nCount;
int ncount = ntotal;
findChildren(p1,nRes,ncount);
matched=false;
for(const Particle& p2 : ufs.particles(Cuts::pid==-sign*411)) {
map<long,int> nRes2 = nRes;
int ncount2 = ncount;
findChildren(p2,nRes2,ncount2);
if(ncount2!=1) continue;
matched=true;
for(auto const & val : nRes2) {
if(abs(val.first)==211) {
if(val.second!=1) {
matched = false;
break;
}
}
else if(val.second!=0) {
matched = false;
break;
}
}
if(matched) break;
}
if(matched) {
_nD1D->fill();
break;
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
double fact = crossSection()/ sumOfWeights()/picobarn;
for(unsigned int iy=9;iy<11;++iy) {
double sigma,error;
if(iy==9) {
sigma = _nD1D->val()*fact;
error = _nD1D->err()*fact;
}
else if(iy==10) {
sigma = _nPsi->val()*fact;
error = _nPsi->err()*fact;
}
Scatter2D temphisto(refData(1, 1, iy));
Scatter2DPtr mult;
book(mult,1,1,iy);
for (size_t b = 0; b < temphisto.numPoints(); b++) {
const double x = temphisto.point(b).x();
pair<double,double> ex = temphisto.point(b).xErrs();
pair<double,double> ex2 = ex;
if(ex2.first ==0.) ex2. first=0.0001;
if(ex2.second==0.) ex2.second=0.0001;
if (inRange(sqrtS()/GeV, x-ex2.first, x+ex2.second)) {
mult ->addPoint(x, sigma, ex, make_pair(error,error));
}
else {
mult ->addPoint(x, 0., ex, make_pair(0.,.0));
}
}
}
}
//@}
/// @name Histograms
//@{
CounterPtr _nD1D, _nPsi;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(BESIII_2019_I1756876);
}
|