Rivet analyses

title: CLEOII_1996_I397787

Mass distributions in $\Xi_c^+\to\Sigma^+K^-\pi^+$

Experiment: CLEOII (CESR)

Inspire ID: 397787

Status: VALIDATED NOHEPDATA

Authors: - Peter Richardson

References: - Phys.Lett.B 365 (1996) 431-436

Beams: * *

Beam energies: ANY

Run details: - Any process producing Xic+ mesons

Measurement of the mass distributions in the decay $\Xi_c^+\to\Sigma^+K^-\pi^+$ by CLEOII. The data were read from the plots in the paper and may not have been corrected for efficiency/acceptance.

Source code:CLEOII_1996_I397787.cc

```c++ // -- C++ --

include "Rivet/Analysis.hh"

include "Rivet/Projections/DecayedParticles.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief Xi_c+ -> Sigma+ K- pi+ class CLEOII_1996_I397787 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(CLEOII_1996_I397787);


/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
  // Initialise and register projections
  UnstableParticles ufs = UnstableParticles(Cuts::abspid == 4232);
  declare(ufs, "UFS");
  DecayedParticles XICP(ufs);
  XICP.addStable(PID::PI0);
  XICP.addStable(PID::K0S);
  XICP.addStable(PID::ETA);
  XICP.addStable(3222);
  XICP.addStable(-3222);
  declare(XICP, "XICP");
  // histograms
  book(_h, 1, 1, 1);
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  static const map<PdgId, unsigned int>& mode = {{PID::KMINUS, 1}, {3222, 1}, {PID::PIPLUS, 1}};
  static const map<PdgId, unsigned int>& modeCC = {{PID::KPLUS, 1}, {-3222, 1}, {PID::PIMINUS, 1}};
  DecayedParticles XICP = apply<DecayedParticles>(event, "XICP");
  // loop over particles
  for (unsigned int ix = 0; ix < XICP.decaying().size(); ++ix) {
    int sign = 1;
    if (XICP.decaying()[ix].pid() > 0 && XICP.modeMatches(ix, 3, mode)) {
      sign = 1;
    }
    else if (XICP.decaying()[ix].pid() < 0 && XICP.modeMatches(ix, 3, modeCC)) {
      sign = -1;
    }
    else
      continue;
    const Particle& pip = XICP.decayProducts()[ix].at(sign * PID::PIPLUS)[0];
    const Particle& Km = XICP.decayProducts()[ix].at(sign * PID::KMINUS)[0];
    _h->fill((pip.momentum() + Km.momentum()).mass());
  }
}


/// Normalise histograms etc., after the run
void finalize() {
  normalize(_h);
}

/// @}


/// @name Histograms
/// @{
Histo1DPtr _h;
/// @}

};

RIVET_DECLARE_PLUGIN(CLEOII_1996_I397787);

} ```