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 (const auto& 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 (const auto& 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);
}