Rivet analyses

title: ARGUS_1990_I296188

Angular distribution of $B$ mesons in $e^+e^-\to\Upsilon(4S)\to B\bar{B}$

Experiment: ARGUS (DORIS)

Inspire ID: 296188

Status: VALIDATED NOHEPDATA

Authors: - Peter Richardson

References: - Phys.C 48 (1990) 543-552

Beams: e+ e-

Beam energies: (5.3, 5.3)GeV

Run details: - e+ e- -> Upsilon(4S)

Angular distribution of $B$ mesons in $e^+e^-\to\Upsilon(4S)\to B\bar{B}$. The background subtracted data was read from figure 2 in the paper.

Source code:ARGUS_1990_I296188.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief Upsilon(4s) -> B Bbar class ARGUS_1990_I296188 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(ARGUS_1990_I296188);


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

/// Book histograms and initialise projections before the run
void init() {
  // projections
  declare(UnstableParticles(), "UFS");
  // histos
  book(_h, 1, 1, 1);
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
  for (const Particle& p : ufs.particles(Cuts::pid == 300553)) {
    // boost to rest frame
    LorentzTransform cms_boost;
    // loop over decay products
    for (const Particle& p2 : p.children()) {
      if (p2.abspid() == 511 || p2.abspid() == 521) {
        _h->fill(abs(p2.p3().z() / p2.p3().mod()));
      }
    }
  }
}


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

/// @}


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

};

RIVET_DECLARE_PLUGIN(ARGUS_1990_I296188);

} ```