Rivet analyses

title: LHCB_2023_I2633007

Differential branching ratio w.r.t. $q^2$ for $\Lambda^b_0\to\Lambda(1520)^0\mu^+\mu^-$

Experiment: LHCB (LHC)

Inspire ID: 2633007

Status: VALIDATED NOHEPDATA

Authors: - Peter Richardson

References: - arXiv: 2302.08262

Beams: * *

Beam energies: ANY

Run details: - Any process producing Lambda_b0 baryons, originally pp

Measurement of the differential branching ratio w.r.t. $q^2$ for $\Lambda^b_0\to\Lambda(1520)^0\mu^+\mu^-$. The data were taken from the table in the paper.

Source code:LHCB_2023_I2633007.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/DecayedParticles.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief Lambdab0 -> Lambda(1520) mu+mu- class LHCB_2023_I2633007 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(LHCB_2023_I2633007);


/// @name Analysis methods
/// @{

/// Book histograms and initialise projections before the run
void init() {
  // Initialise and register projections
  UnstableParticles ufs = UnstableParticles(Cuts::abspid == 5122);
  declare(ufs, "UFS");
  DecayedParticles BB(ufs);
  BB.addStable(102134);
  BB.addStable(-102134);
  declare(BB, "BB");
  // histos
  for (unsigned int ix = 0; ix < 2; ++ix) {
    book(_h[ix], 1, 1 + ix, 1);
  }
  book(_c, "TMP/nLambdab");
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  static const map<PdgId, unsigned int> mode = {{102134, 1}, {13, 1}, {-13, 1}};
  static const map<PdgId, unsigned int> modeCC = {{-102134, 1}, {13, 1}, {-13, 1}};
  DecayedParticles BB = apply<DecayedParticles>(event, "BB");
  // loop over particles
  for (unsigned int ix = 0; ix < BB.decaying().size(); ++ix) {
    _c->fill();
    if (!((BB.decaying()[ix].pid() > 0 && BB.modeMatches(ix, 3, mode))
          || (BB.decaying()[ix].pid() < 0 && BB.modeMatches(ix, 3, modeCC))))
      continue;
    const Particle& lp = BB.decayProducts()[ix].at(-13)[0];
    const Particle& lm = BB.decayProducts()[ix].at(13)[0];
    const double qq = (lp.mom() + lm.mom()).mass2();
    _h[0]->fill(qq);
    _h[1]->fill(qq);
  }
}


/// Normalise histograms etc., after the run
void finalize() {
  scale(_h, 1e8 / *_c);
}

/// @}


/// @name Histograms
/// @{
Histo1DPtr _h[2];
CounterPtr _c;
/// @}

};

RIVET_DECLARE_PLUGIN(LHCB_2023_I2633007);

} ```