Rivet analyses
Measurement of charm final-states, the total hadronic cross section and R for energies between 3.92 and 4.26 GeV
Experiment: CLEOC (CESR)
Inspire ID: 777917
Status: VALIDATED
Authors: - Peter Richardson
References: - Phys.Rev. D80 (2009) 072001, 2009
Beams: e- e+
Beam energies: ANY
Run details: - e+ e- to hadrons and e+ e- to mu+ mu- (for normalization)
Measurement of charm final-states, the total hadronic cross section and R for energies between 3.92 and 4.26 GeV The muonic cross section is also outputted to the yoda file so that ratio R can be recalcuated if runs are combined.
Source
code:CLEOC_2008_I777917.cc
#// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief Charm cross sections 3.92 and 4.26 GeV
class CLEOC_2008_I777917 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(CLEOC_2008_I777917);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(FinalState(), "FS");
declare(UnstableParticles(), "UFS");
for(unsigned int ix=0;ix<3;++ix)
for(unsigned int iy=0;iy<3;++iy)
book(_sigma_DD[ix][iy],1+ix,1,1+iy);
for(unsigned int ix=0;ix<2;++ix) {
book(_sigma_DDpi[ix],4,1,1+ix);
book(_sigma_DDX [ix],5,1,1+ix);
}
book(_sigma_R[0],"TMP/hadron",refData<YODA::BinnedEstimate<int>>(6,1,1));
book(_sigma_R[1],"TMP/muon",refData<YODA::BinnedEstimate<int>>(6,1,1));
book(_sigma_cc,6,1,1);
}
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");
// total hadronic and muonic cross sections
map<long,int> nCount;
int ntotal(0);
for (const Particle& p : fs.particles()) {
nCount[p.pid()] += 1;
++ntotal;
}
// mu+mu- + photons
if(nCount[-13]==1 and nCount[13]==1 &&
ntotal==2+nCount[22]) {
_sigma_R[1]->fill(round(sqrtS()/MeV));
return;
}
else
_sigma_R[0] ->fill(round(sqrtS()/MeV));
// identified final state with D mesons
const FinalState& ufs = apply<UnstableParticles>(event, "UFS");
for(unsigned int ix=0;ix<ufs.particles().size();++ix) {
const Particle& p1 = ufs.particles()[ix];
int id1 = abs(p1.pid());
if(id1 != 411 && id1 != 413 && id1 != 421 && id1 != 423 &&
id1 != 431 && id1 != 433)
continue;
// check fs
bool fs = true;
for (const Particle & child : p1.children()) {
if(child.pid()==p1.pid()) {
fs = false;
break;
}
}
if(!fs) continue;
// find the children
map<long,int> nRes = nCount;
int ncount = ntotal;
findChildren(p1,nRes,ncount);
bool matched=false;
int sign = p1.pid()/id1;
// loop over the other fs particles
for(unsigned int iy=ix+1;iy<ufs.particles().size();++iy) {
const Particle& p2 = ufs.particles()[iy];
fs = true;
for (const Particle & child : p2.children()) {
if(child.pid()==p2.pid()) {
fs = false;
break;
}
}
if(!fs) continue;
if(p2.pid()/abs(p2.pid())==sign) continue;
int id2 = abs(p2.pid());
if(id2 != 411 && id2 != 413 && id2 != 421 && id2 != 423 &&
id2 != 431 && id2 != 433)
continue;
if(!p2.parents().empty() && p2.parents()[0].pid()==p1.pid())
continue;
if((id1==411 || id1==421 || id1==431) && (id2==411 || id2==421 || id2==431 )) {
_sigma_DDX[1]->fill(round(sqrtS()/MeV));
_sigma_cc->fill(round(sqrtS()/MeV));
}
map<long,int> nRes2 = nRes;
int ncount2 = ncount;
findChildren(p2,nRes2,ncount2);
if(ncount2==0) {
matched=true;
for(auto const & val : nRes2) {
if(val.second!=0) {
matched = false;
break;
}
}
if(matched) {
if(id1==411 && id2==411) {
_sigma_DD[1][0]->fill(round(sqrtS()/MeV));
_sigma_DDX[0] ->fill(round(sqrtS()/MeV));
}
else if(id1==421&& id2==421) {
_sigma_DD[0][0]->fill(round(sqrtS()/MeV));
_sigma_DDX[0] ->fill(round(sqrtS()/MeV));
}
else if(id1==431&& id2==431) {
_sigma_DD[2][0]->fill(round(sqrtS()/MeV));
}
else if(id1==413 && id2==413) {
_sigma_DD[1][2]->fill(round(sqrtS()/MeV));
}
else if(id1==423&& id2==423) {
_sigma_DD[0][2]->fill(round(sqrtS()/MeV));
}
else if(id1==433&& id2==433) {
_sigma_DD[2][2]->fill(round(sqrtS()/MeV));
}
else if((id1==421 && id2==423) ||
(id1==423 && id2==421)) {
_sigma_DD[0][1]->fill(round(sqrtS()/MeV));
}
else if((id1==411 && id2==413) ||
(id1==413 && id2==411)) {
_sigma_DD[1][1]->fill(round(sqrtS()/MeV));
}
else if((id1==431 && id2==433) ||
(id1==433 && id2==431)) {
_sigma_DD[2][1]->fill(round(sqrtS()/MeV));
}
}
}
else if(ncount2==1) {
int ipi=0;
if(nRes2[111]==1 && nRes2[211]==0 && nRes[-211]==0 )
ipi = 111;
else if(nRes2[111]==0 && nRes2[211]==1 && nRes[-211]==0 )
ipi = 211;
else if(nRes2[111]==0 && nRes2[211]==0 && nRes[-211]==1 )
ipi =-211;
if(ipi==0) continue;
matched=true;
for(auto const & val : nRes2) {
if(val.first==ipi)
continue;
else if(val.second!=0) {
matched = false;
break;
}
}
if(matched) {
bool Ddecay = false;
Particle mother = p1;
while (!mother.parents().empty()) {
mother = mother.parents()[0];
if(PID::isCharmMeson(mother.pid()) && mother.pid()!=p1.pid()) {
Ddecay = true;
break;
}
}
mother = p2;
while (!mother.parents().empty()) {
mother = mother.parents()[0];
if(PID::isCharmMeson(mother.pid()) && mother.pid()!=p1.pid()) {
Ddecay = true;
break;
}
}
if(Ddecay) continue;
if((id1==413 || id1==423 ) &&
(id2==413 || id2==423 )) {
_sigma_DDpi[1]->fill(round(sqrtS()/MeV));
}
else if((id1==411 || id1==421 ) &&
(id2==413 || id2==423 )) {
_sigma_DDpi[0]->fill(round(sqrtS()/MeV));
}
else if((id1==413 || id1==423 ) &&
(id2==411 || id2==421 )) {
_sigma_DDpi[0]->fill(round(sqrtS()/MeV));
}
}
}
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
// cross sections
double fact = crossSection()/picobarn/ sumOfWeights();
for(unsigned int ix=0;ix<3;++ix)
for(unsigned int iy=0;iy<3;++iy)
scale(_sigma_DD[ix][iy],fact);
for(unsigned int ix=0;ix<2;++ix) {
scale(_sigma_DDpi[ix],fact);
scale(_sigma_DDX [ix],fact*1e-3); // this one in nb
}
BinnedEstimatePtr<int> tmp;
book(tmp,6,1,2);
divide(_sigma_R[0],_sigma_R[1],tmp);
scale(_sigma_cc,fact*1e-3);
}
/// @}
/// @name Histograms
/// @{
BinnedHistoPtr<int> _sigma_DD[3][3];
BinnedHistoPtr<int> _sigma_DDpi[2];
BinnedHistoPtr<int> _sigma_DDX[2];
BinnedHistoPtr<int> _sigma_R[2],_sigma_cc;
/// @}
};
RIVET_DECLARE_PLUGIN(CLEOC_2008_I777917);
}