Rivet analyses
title: MC_DALITZ_ETAC
MC analysis of Dalitz plots in three-body $\eta_c$ decays
Experiment: ()
Status: VALIDATED NOHEPDATA
Authors: - Peter Richardson
References: none listed
Beams: * *
Beam energies: ANY
Run details: - Any process producing eta_c mesons
Monte Carlo analysis of common three-body decays of $eta_c$ mesons. The $\pi^+\pi^-\eta$, $\pi^0\pi^0\eta$, $\pi^+\pi^-\eta^\prime$, $\pi^0\pi^0\eta^\prime$, $K^+K^-\eta$, $K^0_{S,L}K^0_{S,L}\eta$, $K^+K^-\eta^\prime$, $K^0_{S,L}K^0_{S,L}\eta^\prime$, $K^+K^-\pi^0$, $K^0_{S,L}K^0_{S,L}\pi^0$, $K^0_{S,L}K^+\pi^-$, $K^0_{S,L}K^-\pi^+$ modes are included.
Source code:MC_DALITZ_ETAC.cc
```c++ // -- C++ --
include "Rivet/Analysis.hh"
include "Rivet/Projections/DecayedParticles.hh"
include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief eta_c Dalitz plots class MC_DALITZ_ETAC : public Analysis { public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(MC_DALITZ_ETAC);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
UnstableParticles ufs = UnstableParticles(Cuts::pid == 441);
declare(ufs, "UFS");
DecayedParticles ETAC(ufs);
ETAC.addStable(PID::PI0);
ETAC.addStable(PID::K0S);
ETAC.addStable(PID::ETA);
ETAC.addStable(PID::ETAPRIME);
declare(ETAC, "ETAC");
// histos
// pi+pi- eta
book(_h1_pippim, "h01_pippim", 100, 0.2, 2.5);
book(_h1_pipeta, "h01_pipeta", 100, 0.5, 3.0);
book(_h1_pimeta, "h01_pimeta", 100, 0.5, 3.0);
book(_dalitz[0], "dalitz01", 50, 0., 9., 50, 0., 9.);
// pi0 pi0 eta
book(_h2_pi0pi0, "h02_pi0pi0", 100, 0.2, 2.5);
book(_h2_pi0eta, "h02_pi0eta", 100, 0.5, 3.0);
book(_dalitz[1], "dalitz02", 50, 0., 9., 50, 0., 9.);
// pi+pi- eta'
book(_h3_pippim, "h03_pippim", 100, 0.2, 2.2);
book(_h3_pipeta, "h03_pipeta", 100, 1.0, 3.0);
book(_h3_pimeta, "h03_pimeta", 100, 1.0, 3.0);
book(_dalitz[2], "dalitz03", 50, 0., 9., 50, 0., 9.);
// pi0 pi0 eta'
book(_h4_pi0pi0, "h04_pi0pi0", 100, 0.2, 2.2);
book(_h4_pi0eta, "h04_pi0eta", 100, 1.0, 3.0);
book(_dalitz[3], "dalitz04", 50, 0., 9., 50, 0., 9.);
// K+K- eta
book(_h5_KpKm, "h05_KpKm", 100, 0.5, 2.5);
book(_h5_Kpeta, "h05_Kpeta", 100, 1.0, 3.0);
book(_h5_Kmeta, "h05_Kmeta", 100, 1.0, 3.0);
book(_dalitz[4], "dalitz05", 50, 1., 7., 50, 1., 7.);
// KS0 KS0 eta
book(_h6_KS0KS0, "h06_KS0KS0", 100, 0.5, 2.5);
book(_h6_KS0eta, "h06_KS0eta", 100, 1.0, 3.0);
book(_dalitz[5], "dalitz06", 50, 1., 7., 50, 1., 7.);
// KL0 KL0 eta
book(_h7_KL0KL0, "h07_KL0KL0", 100, 0.5, 2.5);
book(_h7_KL0eta, "h07_KL0eta", 100, 1.0, 3.0);
book(_dalitz[6], "dalitz07", 50, 1., 7., 50, 1., 7.);
// K+K- eta'
book(_h8_KpKm, "h08_KpKm", 100, 0.9, 2.2);
book(_h8_Kpeta, "h08_Kpeta", 100, 1.3, 2.7);
book(_h8_Kmeta, "h08_Kmeta", 100, 1.3, 2.7);
book(_dalitz[7], "dalitz08", 50, 1.5, 6.5, 50, 1.5, 6.5);
// KS0 KS0 eta'
book(_h9_KS0KS0, "h09_KS0KS0", 100, 0.9, 2.2);
book(_h9_KS0eta, "h09_KS0eta", 100, 1.3, 2.7);
book(_dalitz[8], "dalitz09", 50, 1.5, 6.5, 50, 1.5, 6.5);
// KL0 KL0 eta'
book(_h10_KL0KL0, "h10_KL0KL0", 100, 0.9, 2.2);
book(_h10_KL0eta, "h10_KL0eta", 100, 1.3, 2.7);
book(_dalitz[9], "dalitz10", 50, 1.5, 6.5, 50, 1.5, 6.5);
// K+K- pi0
book(_h11_KpKm, "h11_KpKm", 100, 0.9, 2.8);
book(_h11_Kppi0, "h11_Kppi0", 100, 0.6, 2.8);
book(_h11_Kmpi0, "h11_Kmpi0", 100, 0.6, 2.8);
book(_dalitz[10], "dalitz11", 50, 0.3, 6.5, 50, 0.3, 6.5);
// KS0 KS0 pi0
book(_h12_KS0KS0, "h12_KS0KS0", 100, 0.9, 2.8);
book(_h12_KS0pi0, "h12_KS0pi0", 100, 0.6, 2.8);
book(_dalitz[11], "dalitz12", 50, 0.3, 6.5, 50, 0.3, 6.5);
// KL0 KL0 pi0
book(_h13_KL0KL0, "h13_KL0KL0", 100, 0.9, 2.8);
book(_h13_KL0pi0, "h13_KL0pi0", 100, 0.6, 2.8);
book(_dalitz[12], "dalitz13", 50, 0.3, 6.5, 50, 0.3, 6.5);
// KS0 K+ pi-
book(_h14_KpKS0, "h14_KpKS0", 100, 0.9, 2.8);
book(_h14_Kppim, "h14_Kppim", 100, 0.6, 2.8);
book(_h14_KS0pim, "h14_KS0pim", 100, 0.6, 2.8);
book(_dalitz[13], "dalitz14", 50, 0.3, 6.5, 50, 0.3, 6.5);
// KS0 K- pi+
book(_h15_KmKS0, "h15_KmKS0", 100, 0.9, 2.8);
book(_h15_Kmpip, "h15_Kmpip", 100, 0.6, 2.8);
book(_h15_KS0pip, "h15_KS0pip", 100, 0.6, 2.8);
book(_dalitz[14], "dalitz15", 50, 0.3, 6.5, 50, 0.3, 6.5);
// KL0 K+ pi-
book(_h16_KpKL0, "h16_KpKL0", 100, 0.9, 2.8);
book(_h16_Kppim, "h16_Kppim", 100, 0.6, 2.8);
book(_h16_KL0pim, "h16_KL0pim", 100, 0.6, 2.8);
book(_dalitz[15], "dalitz16", 50, 0.3, 6.5, 50, 0.3, 6.5);
// KL0 K- pi+
book(_h17_KmKL0, "h17_KmKL0", 100, 0.9, 2.8);
book(_h17_Kmpip, "h17_Kmpip", 100, 0.6, 2.8);
book(_h17_KL0pip, "h17_KL0pip", 100, 0.6, 2.8);
book(_dalitz[16], "dalitz17", 50, 0.3, 6.5, 50, 0.3, 6.5);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId, unsigned int>& mode1 = {{211, 1}, {-211, 1}, {221, 1}};
static const map<PdgId, unsigned int>& mode2 = {{111, 2}, {221, 1}};
static const map<PdgId, unsigned int>& mode3 = {{211, 1}, {-211, 1}, {331, 1}};
static const map<PdgId, unsigned int>& mode4 = {{111, 2}, {331, 1}};
static const map<PdgId, unsigned int>& mode5 = {{321, 1}, {-321, 1}, {221, 1}};
static const map<PdgId, unsigned int>& mode6 = {{310, 2}, {221, 1}};
static const map<PdgId, unsigned int>& mode7 = {{130, 2}, {221, 1}};
static const map<PdgId, unsigned int>& mode8 = {{321, 1}, {-321, 1}, {331, 1}};
static const map<PdgId, unsigned int>& mode9 = {{310, 2}, {331, 1}};
static const map<PdgId, unsigned int>& mode10 = {{130, 2}, {331, 1}};
static const map<PdgId, unsigned int>& mode11 = {{321, 1}, {-321, 1}, {111, 1}};
static const map<PdgId, unsigned int>& mode12 = {{310, 2}, {111, 1}};
static const map<PdgId, unsigned int>& mode13 = {{130, 2}, {111, 1}};
static const map<PdgId, unsigned int>& mode14 = {{321, 1}, {-211, 1}, {310, 1}};
static const map<PdgId, unsigned int>& mode15 = {{-321, 1}, {211, 1}, {310, 1}};
static const map<PdgId, unsigned int>& mode16 = {{321, 1}, {-211, 1}, {130, 1}};
static const map<PdgId, unsigned int>& mode17 = {{-321, 1}, {211, 1}, {130, 1}};
DecayedParticles ETAC = apply<DecayedParticles>(event, "ETAC");
// loop over particles
for (unsigned int ix = 0; ix < ETAC.decaying().size(); ++ix) {
if (ETAC.decaying()[ix].mass() < 2.93 || ETAC.decaying()[ix].mass() > 3.03) continue;
// pi+ pi- eta
if (ETAC.modeMatches(ix, 3, mode1)) {
const Particle& pip = ETAC.decayProducts()[ix].at(211)[0];
const Particle& pim = ETAC.decayProducts()[ix].at(-211)[0];
const Particle& eta = ETAC.decayProducts()[ix].at(221)[0];
double mplus = (pip.momentum() + eta.momentum()).mass2();
double mminus = (pim.momentum() + eta.momentum()).mass2();
double mpipi = (pip.momentum() + pim.momentum()).mass2();
_h1_pippim->fill(sqrt(mpipi));
_h1_pipeta->fill(sqrt(mplus));
_h1_pimeta->fill(sqrt(mminus));
_dalitz[0]->fill(mplus, mminus);
}
// pi0 pi0 eta
else if (ETAC.modeMatches(ix, 3, mode2)) {
const Particles& pi0 = ETAC.decayProducts()[ix].at(111);
const Particle& eta = ETAC.decayProducts()[ix].at(221)[0];
double m1 = (pi0[0].momentum() + eta.momentum()).mass2();
double m2 = (pi0[1].momentum() + eta.momentum()).mass2();
double mpipi = (pi0[0].momentum() + pi0[1].momentum()).mass2();
_h2_pi0pi0->fill(sqrt(mpipi));
_h2_pi0eta->fill(sqrt(m1));
_h2_pi0eta->fill(sqrt(m2));
_dalitz[1]->fill(m1, m2);
_dalitz[1]->fill(m2, m1);
}
// pi+ pi- eta'
else if (ETAC.modeMatches(ix, 3, mode3)) {
const Particle& pip = ETAC.decayProducts()[ix].at(211)[0];
const Particle& pim = ETAC.decayProducts()[ix].at(-211)[0];
const Particle& etaP = ETAC.decayProducts()[ix].at(331)[0];
double mplus = (pip.momentum() + etaP.momentum()).mass2();
double mminus = (pim.momentum() + etaP.momentum()).mass2();
double mpipi = (pip.momentum() + pim.momentum()).mass2();
_h3_pippim->fill(sqrt(mpipi));
_h3_pipeta->fill(sqrt(mplus));
_h3_pimeta->fill(sqrt(mminus));
_dalitz[2]->fill(mplus, mminus);
}
// pi0 pi0 eta'
else if (ETAC.modeMatches(ix, 3, mode4)) {
const Particles& pi0 = ETAC.decayProducts()[ix].at(111);
const Particle& etaP = ETAC.decayProducts()[ix].at(331)[0];
double m1 = (pi0[0].momentum() + etaP.momentum()).mass2();
double m2 = (pi0[1].momentum() + etaP.momentum()).mass2();
double mpipi = (pi0[0].momentum() + pi0[1].momentum()).mass2();
_h4_pi0pi0->fill(sqrt(mpipi));
_h4_pi0eta->fill(sqrt(m1));
_h4_pi0eta->fill(sqrt(m2));
_dalitz[3]->fill(m1, m2);
_dalitz[3]->fill(m2, m1);
}
// K+K- eta
else if (ETAC.modeMatches(ix, 3, mode5)) {
const Particle& Kp = ETAC.decayProducts()[ix].at(321)[0];
const Particle& Km = ETAC.decayProducts()[ix].at(-321)[0];
const Particle& eta = ETAC.decayProducts()[ix].at(221)[0];
double mplus = (Kp.momentum() + eta.momentum()).mass2();
double mminus = (Km.momentum() + eta.momentum()).mass2();
double mKK = (Kp.momentum() + Km.momentum()).mass2();
_h5_KpKm->fill(sqrt(mKK));
_h5_Kpeta->fill(sqrt(mplus));
_h5_Kmeta->fill(sqrt(mminus));
_dalitz[4]->fill(mplus, mminus);
}
// KS0 KS0 eta
else if (ETAC.modeMatches(ix, 3, mode6)) {
const Particles& KS0 = ETAC.decayProducts()[ix].at(310);
const Particle& eta = ETAC.decayProducts()[ix].at(221)[0];
double m1 = (KS0[0].momentum() + eta.momentum()).mass2();
double m2 = (KS0[1].momentum() + eta.momentum()).mass2();
double mKSKS = (KS0[0].momentum() + KS0[1].momentum()).mass2();
_h6_KS0KS0->fill(sqrt(mKSKS));
_h6_KS0eta->fill(sqrt(m1));
_h6_KS0eta->fill(sqrt(m2));
_dalitz[5]->fill(m1, m2);
_dalitz[5]->fill(m2, m1);
}
// KL0 KL0 eta
else if (ETAC.modeMatches(ix, 3, mode7)) {
const Particles& KL0 = ETAC.decayProducts()[ix].at(130);
const Particle& eta = ETAC.decayProducts()[ix].at(221)[0];
double m1 = (KL0[0].momentum() + eta.momentum()).mass2();
double m2 = (KL0[1].momentum() + eta.momentum()).mass2();
double mKLKL = (KL0[0].momentum() + KL0[1].momentum()).mass2();
_h7_KL0KL0->fill(sqrt(mKLKL));
_h7_KL0eta->fill(sqrt(m1));
_h7_KL0eta->fill(sqrt(m2));
_dalitz[6]->fill(m1, m2);
_dalitz[6]->fill(m2, m1);
}
// K+K- eta'
else if (ETAC.modeMatches(ix, 3, mode8)) {
const Particle& Kp = ETAC.decayProducts()[ix].at(321)[0];
const Particle& Km = ETAC.decayProducts()[ix].at(-321)[0];
const Particle& etaP = ETAC.decayProducts()[ix].at(331)[0];
double mplus = (Kp.momentum() + etaP.momentum()).mass2();
double mminus = (Km.momentum() + etaP.momentum()).mass2();
double mKK = (Kp.momentum() + Km.momentum()).mass2();
_h8_KpKm->fill(sqrt(mKK));
_h8_Kpeta->fill(sqrt(mplus));
_h8_Kmeta->fill(sqrt(mminus));
_dalitz[7]->fill(mplus, mminus);
}
// KS0 KS0 eta'
else if (ETAC.modeMatches(ix, 3, mode9)) {
const Particles& KS0 = ETAC.decayProducts()[ix].at(310);
const Particle& etaP = ETAC.decayProducts()[ix].at(331)[0];
double m1 = (KS0[0].momentum() + etaP.momentum()).mass2();
double m2 = (KS0[1].momentum() + etaP.momentum()).mass2();
double mKSKS = (KS0[0].momentum() + KS0[1].momentum()).mass2();
_h9_KS0KS0->fill(sqrt(mKSKS));
_h9_KS0eta->fill(sqrt(m1));
_h9_KS0eta->fill(sqrt(m2));
_dalitz[8]->fill(m1, m2);
_dalitz[8]->fill(m2, m1);
}
// KL0 KL0 eta'
else if (ETAC.modeMatches(ix, 3, mode10)) {
const Particles& KL0 = ETAC.decayProducts()[ix].at(130);
const Particle& etaP = ETAC.decayProducts()[ix].at(331)[0];
double m1 = (KL0[0].momentum() + etaP.momentum()).mass2();
double m2 = (KL0[1].momentum() + etaP.momentum()).mass2();
double mKLKL = (KL0[0].momentum() + KL0[1].momentum()).mass2();
_h10_KL0KL0->fill(sqrt(mKLKL));
_h10_KL0eta->fill(sqrt(m1));
_h10_KL0eta->fill(sqrt(m2));
_dalitz[9]->fill(m1, m2);
_dalitz[9]->fill(m2, m1);
}
// K+ K- pi0
else if (ETAC.modeMatches(ix, 3, mode11)) {
const Particle& Kp = ETAC.decayProducts()[ix].at(321)[0];
const Particle& Km = ETAC.decayProducts()[ix].at(-321)[0];
const Particle& pi0 = ETAC.decayProducts()[ix].at(111)[0];
double mplus = (Kp.momentum() + pi0.momentum()).mass2();
double mminus = (Km.momentum() + pi0.momentum()).mass2();
double mKK = (Kp.momentum() + Km.momentum()).mass2();
_h11_KpKm->fill(sqrt(mKK));
_h11_Kppi0->fill(sqrt(mplus));
_h11_Kmpi0->fill(sqrt(mminus));
_dalitz[10]->fill(mplus, mminus);
}
// KS0 KS0 pi0
else if (ETAC.modeMatches(ix, 3, mode12)) {
const Particles& KS0 = ETAC.decayProducts()[ix].at(310);
const Particle& pi0 = ETAC.decayProducts()[ix].at(111)[0];
double mplus = (KS0[0].momentum() + pi0.momentum()).mass2();
double mminus = (KS0[1].momentum() + pi0.momentum()).mass2();
double mKK = (KS0[0].momentum() + KS0[1].momentum()).mass2();
_h12_KS0KS0->fill(sqrt(mKK));
_h12_KS0pi0->fill(sqrt(mplus));
_h12_KS0pi0->fill(sqrt(mminus));
_dalitz[11]->fill(mplus, mminus);
}
// KL0 KL0 pi0
else if (ETAC.modeMatches(ix, 3, mode13)) {
const Particles& KL0 = ETAC.decayProducts()[ix].at(130);
const Particle& pi0 = ETAC.decayProducts()[ix].at(111)[0];
double mplus = (KL0[0].momentum() + pi0.momentum()).mass2();
double mminus = (KL0[1].momentum() + pi0.momentum()).mass2();
double mKK = (KL0[0].momentum() + KL0[1].momentum()).mass2();
_h13_KL0KL0->fill(sqrt(mKK));
_h13_KL0pi0->fill(sqrt(mplus));
_h13_KL0pi0->fill(sqrt(mminus));
_dalitz[12]->fill(mplus, mminus);
}
// KS0 K+ pi-
else if (ETAC.modeMatches(ix, 3, mode14)) {
const Particle& KS0 = ETAC.decayProducts()[ix].at(310)[0];
const Particle& Kp = ETAC.decayProducts()[ix].at(321)[0];
const Particle& pim = ETAC.decayProducts()[ix].at(-211)[0];
double mplus = (Kp.momentum() + pim.momentum()).mass2();
double mminus = (KS0.momentum() + pim.momentum()).mass2();
double mKK = (KS0.momentum() + Kp.momentum()).mass2();
_h14_KpKS0->fill(sqrt(mKK));
_h14_Kppim->fill(sqrt(mplus));
_h14_KS0pim->fill(sqrt(mminus));
_dalitz[13]->fill(mplus, mminus);
}
// KS0 K- pi+
else if (ETAC.modeMatches(ix, 3, mode15)) {
const Particle& KS0 = ETAC.decayProducts()[ix].at(310)[0];
const Particle& Km = ETAC.decayProducts()[ix].at(-321)[0];
const Particle& pip = ETAC.decayProducts()[ix].at(211)[0];
double mplus = (Km.momentum() + pip.momentum()).mass2();
double mminus = (KS0.momentum() + pip.momentum()).mass2();
double mKK = (KS0.momentum() + Km.momentum()).mass2();
_h15_KmKS0->fill(sqrt(mKK));
_h15_Kmpip->fill(sqrt(mplus));
_h15_KS0pip->fill(sqrt(mminus));
_dalitz[14]->fill(mplus, mminus);
}
// KL0 K+ pi-
else if (ETAC.modeMatches(ix, 3, mode16)) {
const Particle& KL0 = ETAC.decayProducts()[ix].at(130)[0];
const Particle& Kp = ETAC.decayProducts()[ix].at(321)[0];
const Particle& pim = ETAC.decayProducts()[ix].at(-211)[0];
double mplus = (Kp.momentum() + pim.momentum()).mass2();
double mminus = (KL0.momentum() + pim.momentum()).mass2();
double mKK = (KL0.momentum() + Kp.momentum()).mass2();
_h16_KpKL0->fill(sqrt(mKK));
_h16_Kppim->fill(sqrt(mplus));
_h16_KL0pim->fill(sqrt(mminus));
_dalitz[15]->fill(mplus, mminus);
}
// KL0 K- pip
else if (ETAC.modeMatches(ix, 3, mode17)) {
const Particle& KL0 = ETAC.decayProducts()[ix].at(130)[0];
const Particle& Km = ETAC.decayProducts()[ix].at(-321)[0];
const Particle& pip = ETAC.decayProducts()[ix].at(211)[0];
double mplus = (Km.momentum() + pip.momentum()).mass2();
double mminus = (KL0.momentum() + pip.momentum()).mass2();
double mKK = (KL0.momentum() + Km.momentum()).mass2();
_h17_KmKL0->fill(sqrt(mKK));
_h17_Kmpip->fill(sqrt(mplus));
_h17_KL0pip->fill(sqrt(mminus));
_dalitz[16]->fill(mplus, mminus);
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
normalize(_h1_pippim);
normalize(_h1_pipeta);
normalize(_h1_pimeta);
normalize(_h2_pi0pi0);
normalize(_h2_pi0eta);
normalize(_h3_pippim);
normalize(_h3_pipeta);
normalize(_h3_pimeta);
normalize(_h4_pi0pi0);
normalize(_h4_pi0eta);
normalize(_h5_KpKm);
normalize(_h5_Kpeta);
normalize(_h5_Kmeta);
normalize(_h6_KS0KS0);
normalize(_h6_KS0eta);
normalize(_h7_KL0KL0);
normalize(_h7_KL0eta);
normalize(_h8_KpKm);
normalize(_h8_Kpeta);
normalize(_h8_Kmeta);
normalize(_h9_KS0KS0);
normalize(_h9_KS0eta);
normalize(_h10_KL0KL0);
normalize(_h10_KL0eta);
normalize(_h11_KpKm);
normalize(_h11_Kppi0);
normalize(_h11_Kmpi0);
normalize(_h12_KS0KS0);
normalize(_h12_KS0pi0);
normalize(_h13_KL0KL0);
normalize(_h13_KL0pi0);
normalize(_h14_KpKS0);
normalize(_h14_Kppim);
normalize(_h14_KS0pim);
normalize(_h15_KmKS0);
normalize(_h15_Kmpip);
normalize(_h15_KS0pip);
normalize(_h16_KpKL0);
normalize(_h16_Kppim);
normalize(_h16_KL0pim);
normalize(_h17_KmKL0);
normalize(_h17_Kmpip);
normalize(_h17_KL0pip);
for (unsigned int ix = 0; ix < 17; ++ix) normalize(_dalitz[ix]);
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h1_pippim, _h1_pipeta, _h1_pimeta;
Histo1DPtr _h2_pi0pi0, _h2_pi0eta;
Histo1DPtr _h3_pippim, _h3_pipeta, _h3_pimeta;
Histo1DPtr _h4_pi0pi0, _h4_pi0eta;
Histo1DPtr _h5_KpKm, _h5_Kpeta, _h5_Kmeta;
Histo1DPtr _h6_KS0KS0, _h6_KS0eta;
Histo1DPtr _h7_KL0KL0, _h7_KL0eta;
Histo1DPtr _h8_KpKm, _h8_Kpeta, _h8_Kmeta;
Histo1DPtr _h9_KS0KS0, _h9_KS0eta;
Histo1DPtr _h10_KL0KL0, _h10_KL0eta;
Histo1DPtr _h11_KpKm, _h11_Kppi0, _h11_Kmpi0;
Histo1DPtr _h12_KS0KS0, _h12_KS0pi0;
Histo1DPtr _h13_KL0KL0, _h13_KL0pi0;
Histo1DPtr _h14_KpKS0, _h14_Kppim, _h14_KS0pim;
Histo1DPtr _h15_KmKS0, _h15_Kmpip, _h15_KS0pip;
Histo1DPtr _h16_KpKL0, _h16_Kppim, _h16_KL0pim;
Histo1DPtr _h17_KmKL0, _h17_Kmpip, _h17_KL0pip;
Histo2DPtr _dalitz[17];
/// @}
};
RIVET_DECLARE_PLUGIN(MC_DALITZ_ETAC);
} ```