Rivet analyses

title: ARGUS_1993_I340585

$q^2$ spectrum in $\bar{B}^0\to D^{*+}\ell^-\bar\nu_\ell$

Experiment: ARGUS (DORIS)

Inspire ID: 340585

Status: VALIDATED NOHEPDATA

Authors: - Peter Richardson

References: - Z.Phys.C 57 (1993) 533-540

Beams: * *

Beam energies: ANY

Run details: - Any process producing B mesons, originally Upsilon(4S) decays

$q^2$ spectrum in $\bar{B}^0\to D^{*+}\ell^-\bar\nu_\ell$. Corrected data read from figure 7.

Source code:ARGUS_1993_I340585.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/DecayedParticles.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief B -> D* l nu class ARGUS_1993_I340585 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(ARGUS_1993_I340585);


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

/// Book histograms and initialise projections before the run
void init() {
  // Initialise and register projections
  UnstableParticles ufs = UnstableParticles(Cuts::abspid == 511);
  declare(ufs, "UFS");
  DecayedParticles BB(ufs);
  BB.addStable(411);
  BB.addStable(-411);
  BB.addStable(421);
  BB.addStable(-421);
  BB.addStable(413);
  BB.addStable(-413);
  BB.addStable(423);
  BB.addStable(-423);
  BB.addStable(PID::PI0);
  declare(BB, "BB");
  // histos
  book(_h, 1, 1, 1);
  book(_c, "TMP/nB");
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  // loop over B mesons
  DecayedParticles BB = apply<DecayedParticles>(event, "BB");
  // loop over particles
  for (unsigned int ix = 0; ix < BB.decaying().size(); ++ix) {
    _c->fill();
    for (unsigned int il = 0; il < 4; ++il) {
      if (BB.modeMatches(ix, 3, mode[il])) {
        int sign = il % 2 == 0 ? -1 : 1;
        const Particle& DD = BB.decayProducts()[ix].at(sign * 413)[0];
        FourMomentum qq = BB.decaying()[ix].mom() - DD.mom();
        _h->fill(qq.mass2());
      }
    }
  }
}


/// Normalise histograms etc., after the run
void finalize() {
  scale(_h, 0.5 / *_c);
}

/// @}


/// @name Histograms
/// @{
Histo1DPtr _h;
CounterPtr _c;
const map<PdgId, unsigned int> mode[4] = {{{-413, 1}, {-11, 1}, {12, 1}},
                                          {{413, 1}, {11, 1}, {-12, 1}},
                                          {{-413, 1}, {-13, 1}, {14, 1}},
                                          {{413, 1}, {13, 1}, {-14, 1}}};
/// @}

};

RIVET_DECLARE_PLUGIN(ARGUS_1993_I340585);

} ```