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CMS_2017_I1471287

Two- and multi-particle angular correlations in pp collisions at $\sqrt{s} = 13$ TeV.
Experiment: CMS (LHC)
Inspire ID: 1471287
Status: UNVALIDATED
Authors:
  • Christian Bierlich
References:
  • Phys.Lett. B765 (2017) 193-220
  • DOI:10.1016/j.physletb.2016.12.009
  • arXiv: 1606.06198
Beams: p+ p+
Beam energies: (6500.0, 6500.0) GeV
Run details:
  • Minimum bias QCD events.

Measurement of two- and multi-particle angular correlations of charged particles as well as $K^0_s$ and $\Lambda + \bar{\Lambda}$. Measurements are done $p_\perp$ integrated as function of event multiplicity, and $p_\perp$ differential in two bins of event multiplicity; high and low. The experimental analysis performs also a subtraction procedure of low multiplicity results from high multiplicity ones. Such a subtraction is not performed in the RIVET analysis (due to the difficulty of performing the same procedure on MC), and as such, only unsubtracted values are used. Bin edges for integrated correlations are not reported in HepData, and are as such based simply on midpoints between reported points.

Source code: CMS_2017_I1471287.cc
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// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
#include "Rivet/Projections/PrimaryParticles.hh"
#include "Rivet/Tools/Correlators.hh"

namespace Rivet {


  /// @brief Add a short analysis description here
  class CMS_2017_I1471287 : public CumulantAnalysis {
  public:

    /// Constructor
    CMS_2017_I1471287() : CumulantAnalysis("CMS_2017_I1471287") {
    
    };


    /// @name Analysis methods
    //@{

    /// Book histograms and initialise projections before the run
    void init() {
      // A projection for charged tracks to manage centrality, corresponding
      // to CMS offline tracks.
      ChargedFinalState cfsMult(Cuts::abseta < 2.4 && Cuts::pT > 0.4*GeV);
      addProjection(cfsMult, "CFSMult");
      
      // The positive eta side used for rapidity gap, integrated.
      const ChargedFinalState& cfsp = ChargedFinalState(Cuts::eta > 1.0 && 
        Cuts::eta < 2.0 && Cuts::pT > 0.3*GeV && Cuts::pT < 3.0*GeV);
      declare(cfsp, "CFSP");
      // ..negative ditto.
      const ChargedFinalState& cfsn = ChargedFinalState(Cuts::eta < -1.0 && 
        Cuts::eta > -2.0 && Cuts::pT > 0.3*GeV && Cuts::pT < 3.0*GeV);
      declare(cfsn, "CFSN");


      // The positive eta side used for rapidity gap, differential, charged particles.
      const ChargedFinalState& cfsppT = ChargedFinalState(Cuts::eta > 1.0 && 
        Cuts::eta < 2.0 && Cuts::pT > 0.3*GeV && Cuts::pT < 6.0*GeV);
      declare(cfsppT, "CFSPPT");
      // ..negative ditto.
      const ChargedFinalState& cfsnpT = ChargedFinalState(Cuts::eta < -1.0 && 
        Cuts::eta > -2.0 && Cuts::pT > 0.3*GeV && Cuts::pT < 6.0*GeV);
      declare(cfsnpT, "CFSNPT");

      // The positive eta side used for rapidity gap, differential, Kaons.
      const PrimaryParticles& kfsppT = PrimaryParticles({310},Cuts::eta > 1.0 && 
        Cuts::eta < 2.0 && Cuts::pT > 0.3*GeV && Cuts::pT < 6.0*GeV);
      declare(kfsppT, "KFSP");
      // ..negative ditto.
      const PrimaryParticles& kfsnpT = PrimaryParticles({310},Cuts::eta < -1.0 && 
        Cuts::eta > -2.0 && Cuts::pT > 0.3*GeV && Cuts::pT < 6.0*GeV);
      declare(kfsnpT, "KFSN");
     // The positive eta side used for rapidity gap, differential, Lambda.
      const PrimaryParticles& lfsppT = PrimaryParticles({3122},Cuts::eta > 1.0 && 
        Cuts::eta < 2.0 && Cuts::pT > 0.3*GeV && Cuts::pT < 6.0*GeV);
      declare(lfsppT, "LFSP");
      // ..negative ditto.
      const PrimaryParticles& lfsnpT = PrimaryParticles({3122},Cuts::eta < -1.0 && 
        Cuts::eta > -2.0 && Cuts::pT > 0.3*GeV && Cuts::pT < 6.0*GeV);
      declare(lfsnpT, "LFSN");
      
      // v22 |delta eta| > 2 (fig 4a)
      h_v22 = bookScatter2D(1, 1, 1, true);
      // v32 |delta eta| > 2 (fig 4b)
      h_v32 = bookScatter2D(3, 1, 1, true);
      // v22(pT) high mult., high pT (fig 6a)
      h_v22pT = bookScatter2D(11, 1, 1, true);
      // v22(pT) charged low mult. (fig. 7a)
      h_v22pTh = bookScatter2D(17, 1, 1, true);
      // v22(pT) K0S low mult. (fig. 7a)
      h_v22pTK = bookScatter2D(18, 1, 1, true);
      // v22(pT) Lambda low mult. (fig. 7a)
      h_v22pTL = bookScatter2D(19, 1, 1, true);
      // v22(pT) K0S high mult. (fig. 7b)
      h_v22pTKc = bookScatter2D(21, 1, 1, true);
      // v22(pT) Lambda high mult. (fig. 7b)
      h_v22pTLc = bookScatter2D(22, 1, 1, true);
      // c24 (fig. 9a)
      h_c24 = bookScatter2D(28, 1, 1, true);
      // c26 (fig. 9b)
      h_c26 = bookScatter2D(31, 1, 1, true);

      // Corresponding event averaged correlators.
      ec22 = bookECorrelatorGap<2,2>("ec22",h_v22);
      ec32 = bookECorrelatorGap<3,2>("ec32",h_v32);

      // ... pT binned
      ec22pT = bookECorrelatorGap<2,2>("ec22pT",h_v22pT);
      ec22pTh = bookECorrelatorGap<2,2>("ec22pTh",h_v22pTh);
      ec22pTK = bookECorrelatorGap<2,2>("ec22pTK",h_v22pTK);
      ec22pTL = bookECorrelatorGap<2,2>("ec22pTL",h_v22pTL);
      ec22pTKc = bookECorrelatorGap<2,2>("ec22pTKc",h_v22pTKc);
      ec22pTLc = bookECorrelatorGap<2,2>("ec22pTLc",h_v22pTLc);

      // Maximal N and P for the gapped.
      pair<int, int> max = getMaxValues(); 
      
      // For the four particle cumulant.
      ec22_4 = bookECorrelator<2,2>("ec22_4",h_c24);
      ec24_4 = bookECorrelator<2,4>("ec24_4",h_c24);

      // For the six particle cumulant.
      ec22_6 = bookECorrelator<2,2>("ec22_6",h_c26);
      ec24_6 = bookECorrelator<2,4>("ec24_6",h_c26);
      ec26_6 = bookECorrelator<2,6>("ec26_6",h_c26);

      // Maximal N and P for the higher orders.
      pair<int, int> maxH = getMaxValues();

      // Declare correlator projections.
      // For integrated.
      declare(Correlators(cfsMult, maxH.first, maxH.second),"CH");

      // ... gapped
      declare(Correlators(cfsp, max.first, max.second),"CPos");
      declare(Correlators(cfsn, max.first, max.second),"CNeg");

      // For pT differential, charged particles, low multiplicity.
      declare(Correlators(cfsppT, max.first, max.second, h_v22pTh),"CPosLowPT");
      declare(Correlators(cfsnpT, max.first, max.second, h_v22pTh),"CNegLowPT");

      // For pT differential, charged particles, high multiplicity.
      declare(Correlators(cfsppT, max.first, max.second, h_v22pT),"CPosHighPT");
      declare(Correlators(cfsnpT, max.first, max.second, h_v22pT),"CNegHighPT");
      
      // For pT differential, kaons. low multiplicity.
      declare(Correlators(kfsppT, max.first, max.second, h_v22pTK),"CPosLowPTK");
      declare(Correlators(kfsnpT, max.first, max.second, h_v22pTK),"CNegLowPTK");
     
      // For pT differential, kaons. high multiplicity.
      declare(Correlators(kfsppT, max.first, max.second, h_v22pTKc),"CPosHighPTK");
      declare(Correlators(kfsnpT, max.first, max.second, h_v22pTKc),"CNegHighPTK");
      
      // For pT differential, lambda. low multiplicity.
      declare(Correlators(lfsppT, max.first, max.second, h_v22pTL),"CPosLowPTL");
      declare(Correlators(lfsnpT, max.first, max.second, h_v22pTL),"CNegLowPTL");
      
      // For pT differential, lambda. high multiplicity.
      declare(Correlators(lfsppT, max.first, max.second, h_v22pTLc),"CPosHighPTL");
      declare(Correlators(lfsnpT, max.first, max.second, h_v22pTLc),"CNegHighPTL");
      

    }


    /// Perform the per-event analysis
    void analyze(const Event& event) {
      const double w = event.weight();
      const double nTrk = apply<ChargedFinalState>(event, "CFSMult").particles().size();
      if (nTrk < 10) vetoEvent;

      // The correlators.
      const Correlators& ch = apply<Correlators>(event, "CH");

      const Correlators& cp = apply<Correlators>(event, "CPos");
      const Correlators& cn = apply<Correlators>(event, "CNeg");

      const Correlators& cpLow = apply<Correlators>(event, "CPosLowPT");
      const Correlators& cnLow = apply<Correlators>(event, "CNegLowPT");

      const Correlators& cpHigh = apply<Correlators>(event, "CPosHighPT");
      const Correlators& cnHigh = apply<Correlators>(event, "CNegHighPT");

      const Correlators& cpLowK = apply<Correlators>(event, "CPosLowPTK");
      const Correlators& cnLowK = apply<Correlators>(event, "CNegLowPTK");

      const Correlators& cpHighK = apply<Correlators>(event, "CPosHighPTK");
      const Correlators& cnHighK = apply<Correlators>(event, "CNegHighPTK");
      
      const Correlators& cpLowL = apply<Correlators>(event, "CPosLowPTL");
      const Correlators& cnLowL = apply<Correlators>(event, "CNegLowPTL");

      const Correlators& cpHighL = apply<Correlators>(event, "CPosHighPTL");
      const Correlators& cnHighL = apply<Correlators>(event, "CNegHighPTL");

      ec22->fill(nTrk, cp, cn, w);
      ec32->fill(nTrk, cp, cn, w);

      ec22_4->fill(nTrk, ch, w);
      ec24_4->fill(nTrk, ch, w);
      ec22_6->fill(nTrk, ch, w);
      ec24_6->fill(nTrk, ch, w);
      ec26_6->fill(nTrk, ch, w);

      if (nTrk < 20) {
        ec22pTh->fill(cpLow, cnLow, w);
        ec22pTK->fill(cpLowK, cnLowK, w);
        ec22pTL->fill(cpLowL, cnLowL, w);
      }
      else if(nTrk >= 105 && nTrk < 150)
        ec22pT->fill(cpHigh, cnHigh, w);
        ec22pTKc->fill(cpHighK, cnHighK, w);
        ec22pTLc->fill(cpHighL, cnHighL, w);
      }


    /// Normalise histograms etc., after the run
    void finalize() {
      // Correlators must be streamed 
      // in order to run reentrant finalize.
      stream();
      cnTwoInt(h_v22, ec22);
      cnTwoInt(h_v32, ec32);
      vnTwoDiff(h_v22pT, ec22pT);
      vnTwoDiff(h_v22pTh, ec22pTh);
      cnFourInt(h_c24, ec22_4, ec24_4);
      cnSixInt(h_c26, ec22_6, ec24_6, ec26_6);

      // Set correct reference flow for pid flow.
      ec22pTK->setReference(ec22pTh->getReference());
      vnTwoDiff(h_v22pTK, ec22pTK);
      ec22pTL->setReference(ec22pTh->getReference());
      vnTwoDiff(h_v22pTL, ec22pTL);
      ec22pTKc->setReference(ec22pT->getReference());
      vnTwoDiff(h_v22pTKc, ec22pTKc);
      ec22pTLc->setReference(ec22pT->getReference());
      vnTwoDiff(h_v22pTLc, ec22pTLc);

    }

    //@}
      Scatter2DPtr h_v22;
      Scatter2DPtr h_v32;
      Scatter2DPtr h_v22pT;
      Scatter2DPtr h_v22pTh;
      Scatter2DPtr h_v22pTK;
      Scatter2DPtr h_v22pTL;
      Scatter2DPtr h_v22pTKc;
      Scatter2DPtr h_v22pTLc;
      Scatter2DPtr h_c24;
      Scatter2DPtr h_c26;

      ECorrPtr ec22;
      ECorrPtr ec32;

      ECorrPtr ec22_4;
      ECorrPtr ec24_4;

      ECorrPtr ec22_6;
      ECorrPtr ec24_6;
      ECorrPtr ec26_6;

      ECorrPtr ec22pT;
      ECorrPtr ec22pTh;
      ECorrPtr ec22pTK;
      ECorrPtr ec22pTL;
      ECorrPtr ec22pTKc;
      ECorrPtr ec22pTLc;

  };


  // The hook for the plugin system
  DECLARE_RIVET_PLUGIN(CMS_2017_I1471287);


}