Rivet analyses

title: CMS_2015_I1342266

Measurements of the $\Upsilon(1S)$, $\Upsilon(2S)$, and $\Upsilon(3S)$ differential cross sections in pp collisions at $\sqrt{s}=7$ TeV

Experiment: CMS (LHC)

Inspire ID: 1342266

Status: VALIDATED

Authors: - Daniel Clarke - Peter Richardson

References: - Phys.Lett.B 749 (2015) 14-34 - arXiv: 1501.07750 - Expt page: CMS-BPH-12-006

Beams: p+ p+

Beam energies: (3500.0, 3500.0)GeV

Run details: - Upsilon production at LHC energies

Measurement of the transverse momentum distribtions for $\Upsilon(1S)$, $\Upsilon(2S)$, and $\Upsilon(3S)$ production in three rapidity intervals. The production ratios are also measured.

Source code:CMS_2015_I1342266.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

class CMS_2015_I1342266 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(CMS_2015_I1342266);

/// Book histograms and initialise projections before the run
void init() {
  declare(UnstableParticles(), "UFS");
  for (unsigned int ix = 0; ix < 3; ++ix) {
    book(_h_dy_pT[ix], {0.0, 0.6, 1.2});
    for (unsigned int iy = 1; iy < 3; ++iy) {
      book(_h_dy_pT[ix]->bin(iy), iy, 1, 1 + ix);
    }
    book(_h_pT[ix], 3, 1, 1 + ix);
  }
}

/// Perform the per-event analysis
void analyze(const Event& event) {
  // Final state of unstable particles to get particle spectra
  const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");

  for (const Particle& p :
       ufs.particles(Cuts::pid == 553 || Cuts::pid == 100553 || Cuts::pid == 200553)) {
    const double absrap = p.absrap();
    const double xp = p.perp();
    if (absrap > 1.2) continue;
    unsigned int iups = p.pid() / 100000;
    _h_pT[iups]->fill(xp);
    _h_dy_pT[iups]->fill(absrap, xp);
  }
}


/// Normalise histograms etc., after the run
void finalize() {
  const double factor = crossSection() / femtobarn / sumOfWeights();
  const vector<double> brs = {0.0248, 0.0193, 0.0218};
  for (unsigned int ix = 0; ix < 3; ++ix) {
    scale(_h_dy_pT[ix], factor * brs[ix]); //branching ratio
    divByGroupWidth(_h_dy_pT[ix]);
    scale(_h_pT[ix], factor * brs[ix]);
  }
  for (unsigned int i = 1; i < 3; ++i) {
    Estimate1DPtr tmp;
    book(tmp, i + 3, 1, 1);
    divide(_h_dy_pT[1]->bin(i), _h_dy_pT[0]->bin(i), tmp);
    book(tmp, i + 3, 1, 2);
    divide(_h_dy_pT[2]->bin(i), _h_dy_pT[0]->bin(i), tmp);
  }
  Estimate1DPtr tmp;
  book(tmp, 6, 1, 1);
  divide(_h_pT[1], _h_pT[0], tmp);
  book(tmp, 6, 1, 2);
  divide(_h_pT[2], _h_pT[0], tmp);
}

private:

Histo1DGroupPtr _h_dy_pT[3];
Histo1DPtr _h_pT[3];

};

RIVET_DECLARE_PLUGIN(CMS_2015_I1342266); } ```