Rivet analyses
Cross sections for e+e−→ K+K−π+π−, K+K−π0π0, and K+K−K+K− between 1.28 and 5.0 GeV
Experiment: BABAR (PEP-II)
Inspire ID: 892684
Status: VALIDATED
Authors: - Peter Richardson
References: - Phys.Rev. D86 (2012) 012008, 2012
Beams: e+ e-
Beam energies: (0.6, 0.6); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.2, 1.2); (1.2, 1.2); (1.2, 1.2); (1.2, 1.2); (1.2, 1.2); (1.2, 1.2); (1.2, 1.2); (1.2, 1.2); (1.2, 1.2); (1.2, 1.2); (1.2, 1.2); (1.2, 1.2); (1.2, 1.2); (1.2, 1.2); (1.2, 1.2); (1.2, 1.2); (1.3, 1.3); (1.3, 1.3); (1.3, 1.3); (1.3, 1.3); (1.3, 1.3); (1.3, 1.3); (1.3, 1.3); (1.3, 1.3); (1.3, 1.3); (1.3, 1.3); (1.3, 1.3); (1.3, 1.3); (1.3, 1.3); (1.4, 1.4); (1.4, 1.4); (1.4, 1.4); (1.4, 1.4); (1.4, 1.4); (1.4, 1.4); (1.4, 1.4); (1.4, 1.4); (1.4, 1.4); (1.4, 1.4); (1.4, 1.4); (1.4, 1.4); (1.4, 1.4); (1.4, 1.4); (1.4, 1.4); (1.5, 1.5); (1.5, 1.5); (1.5, 1.5); (1.5, 1.5); (1.5, 1.5); (1.5, 1.5); (1.5, 1.5); (1.5, 1.5); (1.5, 1.5); (1.5, 1.5); (1.5, 1.5); (1.5, 1.5); (1.5, 1.5); (1.5, 1.5); (1.6, 1.6); (1.6, 1.6); (1.6, 1.6); (1.6, 1.6); (1.6, 1.6); (1.6, 1.6); (1.6, 1.6); (1.6, 1.6); (1.6, 1.6); (1.6, 1.6); (1.6, 1.6); (1.6, 1.6); (1.6, 1.6); (1.6, 1.6); (1.6, 1.6); (1.7, 1.7); (1.7, 1.7); (1.7, 1.7); (1.7, 1.7); (1.7, 1.7); (1.7, 1.7); (1.7, 1.7); (1.7, 1.7); (1.7, 1.7); (1.7, 1.7); (1.7, 1.7); (1.7, 1.7); (1.7, 1.7); (1.8, 1.8); (1.8, 1.8); (1.8, 1.8); (1.8, 1.8); (1.8, 1.8); (1.8, 1.8); (1.8, 1.8); (1.8, 1.8); (1.8, 1.8); (1.8, 1.8); (1.8, 1.8); (1.8, 1.8); (1.8, 1.8); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (2.0, 2.0); (2.0, 2.0); (2.0, 2.0); (2.0, 2.0); (2.0, 2.0); (2.0, 2.0); (2.0, 2.0); (2.0, 2.0); (2.0, 2.0); (2.0, 2.0); (2.0, 2.0); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.3, 2.3); (2.3, 2.3); (2.3, 2.3); (2.3, 2.3); (2.3, 2.3); (2.3, 2.3); (2.3, 2.3); (2.3, 2.3); (2.4, 2.4); (2.4, 2.4); (2.4, 2.4); (2.4, 2.4); (2.4, 2.4); (2.4, 2.4); (2.4, 2.4); (2.4, 2.4); (2.5, 2.5); (2.5, 2.5); (2.5, 2.5); (2.5, 2.5)GeV
Run details: - e+e- to hadrons
Measurement of the cross section for e+e−→ K+K−π+π−, K+K−π0π0 and K+K−K+K− via radiative return, including the identification of K*0, ϕ and f0(980) mesons for energies between 1.28 and 5.0 GeV.
Source
code:BABAR_2012_I892684.cc
// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief e+e- > K+K- + pi+pi-, pi0pi0 or K+K-
class BABAR_2012_I892684 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2012_I892684);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(FinalState(), "FS");
declare(UnstableParticles(), "UFS");
bool matched = false;
for (size_t ix=0; ix<_sqs.size(); ++ix) {
book(_sigma[ix], 1+ix, 1, 1);
for (const string& en : _sigma[ix].binning().edges<0>()) {
const double eval = stod(en)*GeV;
if (isCompatibleWithSqrtS(eval)) {
_sqs[ix] = en;
matched=true;
break;
}
}
}
raiseBeamErrorIf(!matched);
}
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");
for (const Particle& p : ufs.particles()) {
if (p.children().empty()) continue;
// K*0
if (p.abspid()==313) {
map<long,int> nRes=nCount;
int ncount = ntotal;
findChildren(p,nRes,ncount);
// K* K+/- pi-/+
if (ncount !=2 ) continue;
bool matched = true;
for (const auto& val : nRes) {
if (abs(val.first)==321 || abs(val.first)==211) {
continue;
}
else if (val.second!=0) {
matched = false;
break;
}
}
if (matched==false) continue;
if ((nCount[321] == 1 && nCount[-321] ==0 &&
nCount[211] == 0 && nCount[-211] == 1) ||
(nCount[321] == 0 && nCount[-321] ==1 &&
nCount[211] == 1 && nCount[-211] == 0)) {
if (!_sqs[1].empty()) _sigma[1]->fill(_sqs[1]);
}
}
else if(p.pid()==333) {
map<long,int> nRes=nCount;
int ncount = ntotal;
findChildren(p,nRes,ncount);
// phi pi+pi-
if (ncount==2) {
bool matched = true;
for (const auto& val : nRes) {
if (abs(val.first)==211) {
if (val.second!=1) {
matched = false;
break;
}
}
else if (val.second!=0) {
matched = false;
break;
}
}
if (matched) {
if (!_sqs[2].empty()) _sigma[2]->fill(_sqs[2]);
}
}
for (const Particle& p2 : ufs.particles()) {
if (p2.pid()!=9010221 && p2.pid()!=9000221) continue;
if (p2.parents()[0].isSame(p)) continue;
map<long,int> nResB = nRes;
int ncountB = ncount;
findChildren(p2,nResB,ncountB);
if (ncountB!=0) continue;
bool matched2 = true;
for (const auto& val : nResB) {
if (val.second!=0) {
matched2 = false;
break;
}
}
if (matched2) {
if (p2.pid()==9010221) {
if(!_sqs[6].empty()) _sigma[6]->fill(_sqs[6]);
if(!_sqs[3].empty()) _sigma[3]->fill(_sqs[3]);
}
else {
if(!_sqs[4].empty()) _sigma[4]->fill(_sqs[4]);
}
}
}
}
}
if (ntotal==4) {
if (nCount[321]==1 && nCount[-321]==1 && nCount[211]==1 && nCount[-211]==1) {
if (!_sqs[0].empty()) _sigma[0]->fill(_sqs[0]);
}
else if (nCount[321]==1 && nCount[-321]==1 && nCount[111]==2) {
if (!_sqs[5].empty()) _sigma[5]->fill(_sqs[5]);
}
else if (nCount[321]==2 && nCount[-321]==2) {
if (!_sqs[7].empty()) _sigma[7]->fill(_sqs[7]);
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_sigma, crossSection()/ sumOfWeights() /nanobarn);
}
/// @}
/// @name Histograms
/// @{
BinnedHistoPtr<string> _sigma[8];
vector<string> _sqs = vector<string>(8, ""s);
/// @}
};
RIVET_DECLARE_PLUGIN(BABAR_2012_I892684);
}