Rivet analyses

Differential cross sections for Υ(1, 2, 3S) production at 13 TeV

Experiment: LHCB (LHC)

Inspire ID: 1670013

Status: VALIDATED

Authors: - Peter Richardson

References: - JHEP 07 (2018) 134 - JHEP 05 (2019) 076 (erratum)

Beams: p+ p+

Beam energies: (6500.0, 6500.0)GeV

Run details: - hadronic events with Upsilon production

Measurement of the double differential (in p_⟂ and y) cross section for Υ(1, 2, 3S) production at 13 TeV by the LHCB collaboration.

Source code:`LHCB_2018_I1670013.cc`

// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"


namespace Rivet {


  /// @brief  Upslion production at 13 TeV
  class LHCB_2018_I1670013 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(LHCB_2018_I1670013);


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

    /// Book histograms and initialise projections before the run
    void init() {
      declare(UnstableParticles(), "UFS");
      for(unsigned int iups=0;iups<3;++iups) {
        book(_h_Ups[iups],{2.0,2.5,3.0,3.5,4.0,4.5});
    for(unsigned int iy=0;iy<5;++iy) {
      book(_h_Ups[iups]->bin(iy+1),1+iups,1,1+iy);
    }
    book(_h_Ups_pT  [iups],4,1,1+iups);
    book(_h_Ups_y   [iups],5,1,1+iups);
    book(_h_Ups_pT_r[iups],"TMP/Ups_pT_"+toString(iups),refData(8,1,1));
      }
    }


    /// 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 or Cuts::pid==100553 or Cuts::pid==200553)) {
        double absrap = p.absrap();
        double xp = p.perp();
    if(absrap<2. || absrap>4.5) continue;
    unsigned int iups=p.pid()/100000;
    _h_Ups_pT[iups]  ->fill(xp);
    _h_Ups_pT_r[iups]->fill(xp);
    if(xp<15.) _h_Ups_y[iups]   ->fill(absrap);
    _h_Ups[iups]->fill(absrap,xp);  
      }
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      // 1/2 due rapidity folding +/-
      double factor = 0.5*crossSection()/picobarn/sumOfWeights();
      // branching ratios for upsilon
      vector<double> br = {0.0248,0.0193,0.0218};
      for(unsigned int iups=0;iups<3;++iups) {
    scale(_h_Ups_pT  [iups],factor*br[iups]);
    scale(_h_Ups_y   [iups],factor*br[iups]);
    scale(_h_Ups_pT_r[iups],factor*br[iups]);
    scale(_h_Ups[iups],factor*br[iups]);
        divByGroupWidth(_h_Ups[iups]);
      }
      for(unsigned int iups=1;iups<3;++iups) {
    for(unsigned int ix=0;ix<_h_Ups[0]->numBins();++ix) {
      Estimate1DPtr tmp;
      book(tmp,5+iups,1,1+ix);
      divide(_h_Ups[iups]->bin(ix+1),_h_Ups[0]->bin(ix+1),tmp);
    }
    Estimate1DPtr tmp;
    book(tmp,8,1,iups);
    divide(_h_Ups_pT_r[iups],_h_Ups_pT_r[0],tmp);
    book(tmp,9,1,iups);
    divide(_h_Ups_y[iups],_h_Ups_y[0],tmp);
      }
    }

    /// @}


    /// @name Histograms
    /// @{
    Histo1DPtr _h_Ups_pT[3], _h_Ups_y[3],_h_Ups_pT_r[3];
    Histo1DGroupPtr _h_Ups[3];
    /// @}


  };


  RIVET_DECLARE_PLUGIN(LHCB_2018_I1670013);

}

Rivet analyses

Differential cross sections for Υ(1, 2, 3S) production at 13 TeV

Source code:LHCB_2018_I1670013.cc

Source code:`LHCB_2018_I1670013.cc`