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BABAR_2013_I1238276

Production of charged pions, kaons, and protons in $e^+e^-$ annihilations into hadrons at $\sqrt{s}=10.54$GeV
Experiment: BaBar (PEP-II)
Inspire ID: 1238276
Status: VALIDATED
Authors:
• Peter Richardson
References:
Beams: e+ e-
Beam energies: (3.5, 8.0) GeV
Run details:
• $e^+ e^-$ analysis in the continuum near the $\Upsilon(4S)$ resonance, with CoM boosts of 8.0 GeV ($e^-$) and 3.5 GeV ($e^+$)

Measurement of charged pion, kaon and proton production in $e^+e^-$ collisions with the BABAR detector at the SLAC PEP-II electron-positron storage ring operating at a center-of-mass energy of 10.54 GeV. This is a measurement in the continuum.

Source code: BABAR_2013_I1238276.cc
  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/Beam.hh" #include "Rivet/Projections/ChargedFinalState.hh" namespace Rivet { /// @brief BaBar pion, kaon and proton production in the continuum /// @author Peter Richardson class BABAR_2013_I1238276 : public Analysis { public: BABAR_2013_I1238276() : Analysis("BABAR_2013_I1238276") { } void init() { declare(Beam(), "Beams"); declare(ChargedFinalState(), "FS"); _histPion_no_dec = bookHisto1D(1,1,1); _histKaon_no_dec = bookHisto1D(1,1,2); _histProton_no_dec = bookHisto1D(1,1,3); _histPion_dec = bookHisto1D(2,1,1); _histKaon_dec = bookHisto1D(2,1,2); _histProton_dec = bookHisto1D(2,1,3); } void analyze(const Event& e) { const double weight = e.weight(); // Loop through charged FS particles and look for charmed mesons/baryons const ChargedFinalState& fs = apply(e, "FS"); const Beam beamproj = apply(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()); MSG_DEBUG("CMS Energy sqrt s = " << beamproj.sqrtS()); foreach (const Particle& p, fs.particles()) { // check if prompt or not const GenParticle* pmother = p.genParticle(); const GenVertex* ivertex = pmother->production_vertex(); bool prompt = true; while (ivertex) { int n_inparts = ivertex->particles_in_size(); if (n_inparts < 1) break; pmother = particles(ivertex, HepMC::parents)[0]; // first mother particle int mother_pid = abs(pmother->pdg_id()); if (mother_pid==PID::K0S || mother_pid==PID::LAMBDA) { prompt = false; break; } else if (mother_pid<6) { break; } ivertex = pmother->production_vertex(); } // momentum in CMS frame const double mom = cms_boost.transform(p.momentum()).vector3().mod(); const int PdgId = p.abspid(); MSG_DEBUG("pdgID = " << PdgId << " Momentum = " << mom); switch (PdgId) { case PID::PIPLUS: if(prompt) _histPion_no_dec->fill(mom,weight); _histPion_dec ->fill(mom,weight); break; case PID::KPLUS: if(prompt) _histKaon_no_dec->fill(mom,weight); _histKaon_dec ->fill(mom,weight); break; case PID::PROTON: if(prompt) _histProton_no_dec->fill(mom,weight); _histProton_dec ->fill(mom,weight); default : break; } } } void finalize() { scale(_histPion_no_dec ,1./sumOfWeights()); scale(_histKaon_no_dec ,1./sumOfWeights()); scale(_histProton_no_dec,1./sumOfWeights()); scale(_histPion_dec ,1./sumOfWeights()); scale(_histKaon_dec ,1./sumOfWeights()); scale(_histProton_dec ,1./sumOfWeights()); } private: //@{ // Histograms for continuum data (sqrt(s) = 10.52 GeV) // no K_S and Lambda decays Histo1DPtr _histPion_no_dec; Histo1DPtr _histKaon_no_dec; Histo1DPtr _histProton_no_dec; // including decays Histo1DPtr _histPion_dec; Histo1DPtr _histKaon_dec; Histo1DPtr _histProton_dec; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(BABAR_2013_I1238276); }