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diff --git a/src/Analyses/BABAR_2005_S6181155.cc b/src/Analyses/BABAR_2005_S6181155.cc
--- a/src/Analyses/BABAR_2005_S6181155.cc
+++ b/src/Analyses/BABAR_2005_S6181155.cc
@@ -1,132 +1,134 @@
// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/Beam.hh"
#include "Rivet/Projections/UnstableFinalState.hh"
namespace Rivet {
/// @brief BABAR Xi_c baryons from fragmentation
/// @author Peter Richardson
class BABAR_2005_S6181155 : public Analysis {
public:
BABAR_2005_S6181155()
: Analysis("BABAR_2005_S6181155")
- { }
+ {
+ declare(Beam(), "Beams");
+ }
void analyze(const Event& e) {
const double weight = e.weight();
// Loop through unstable FS particles and look for charmed mesons/baryons
const UnstableFinalState& ufs = apply<UnstableFinalState>(e, "UFS");
const Beam beamproj = apply<Beam>(e, "Beams");
const ParticlePair& beams = beamproj.beams();
const FourMomentum mom_tot = beams.first.momentum() + beams.second.momentum();
const LorentzTransform cms_boost = LorentzTransform::mkFrameTransformFromBeta(mom_tot.betaVec());
const double s = sqr(beamproj.sqrtS());
const bool onresonance = fuzzyEquals(beamproj.sqrtS()/GeV, 10.58, 2E-3);
foreach (const Particle& p, ufs.particles()) {
// 3-momentum in CMS frame
const double mom = cms_boost.transform(p.momentum()).vector3().mod();
// Only looking at Xi_c^0
if (p.abspid() != 4132 ) continue;
if (onresonance) {
_histOnResonanceA_norm->fill(mom,weight);
_histOnResonanceB_norm->fill(mom,weight);
}
else {
_histOffResonance_norm->fill(mom,s/sqr(10.58)*weight);
}
MSG_DEBUG("mom = " << mom);
// off-resonance cross section
if (checkDecay(p.genParticle())) {
if (onresonance) {
_histOnResonanceA->fill(mom,weight);
_histOnResonanceB->fill(mom,weight);
}
else {
_histOffResonance->fill(mom,s/sqr(10.58)*weight);
_sigma->fill(10.6,weight);
}
}
}
}
void finalize() {
scale(_histOnResonanceA, crossSection()/femtobarn/sumOfWeights());
scale(_histOnResonanceB, crossSection()/femtobarn/sumOfWeights());
scale(_histOffResonance, crossSection()/femtobarn/sumOfWeights());
scale(_sigma , crossSection()/femtobarn/sumOfWeights());
normalize(_histOnResonanceA_norm);
normalize(_histOnResonanceB_norm);
normalize(_histOffResonance_norm);
}
private:
//@{
/// Histograms
Histo1DPtr _histOnResonanceA;
Histo1DPtr _histOnResonanceB;
Histo1DPtr _histOffResonance;
Histo1DPtr _sigma ;
Histo1DPtr _histOnResonanceA_norm;
Histo1DPtr _histOnResonanceB_norm;
Histo1DPtr _histOffResonance_norm;
//@}
bool checkDecay(const GenParticle* p) {
unsigned int nstable = 0, npip = 0, npim = 0;
unsigned int nXim = 0, nXip = 0;
findDecayProducts(p, nstable, npip, npim, nXip, nXim);
int id = p->pdg_id();
// Xi_c
if (id == 4132) {
if (nstable == 2 && nXim == 1 && npip == 1) return true;
}
else if (id == -4132) {
if (nstable == 2 && nXip == 1 && npim == 1) return true;
}
return false;
}
void findDecayProducts(const GenParticle* p,
unsigned int& nstable,
unsigned int& npip, unsigned int& npim,
unsigned int& nXip, unsigned int& nXim) {
const GenVertex* dv = p->end_vertex();
/// @todo Use better looping
for (GenVertex::particles_out_const_iterator pp = dv->particles_out_const_begin(); pp != dv->particles_out_const_end(); ++pp) {
int id = (*pp)->pdg_id();
if (id==3312) {
++nXim;
++nstable;
} else if (id == -3312) {
++nXip;
++nstable;
} else if(id == 111 || id == 221) {
++nstable;
} else if ((*pp)->end_vertex()) {
findDecayProducts(*pp, nstable, npip, npim, nXip, nXim);
} else {
if (id != 22) ++nstable;
if (id == 211) ++npip;
else if(id == -211) ++npim;
}
}
}
};
// The hook for the plugin system
DECLARE_RIVET_PLUGIN(BABAR_2005_S6181155);
}

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