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Rivet analyses reference
CMS_2011_S8950903
Dijet azimuthal decorrelations in $pp$ collisions at $\sqrt{s} = 7$ TeV
Experiment: CMS (LHC)
Inspire ID: 885663
Status: VALIDATED
Authors:
References:
- Phys. Rev. Lett. 106 (2011) 122003
- arXiv: 1101.5029
Beams: p+ p+
Beam energies: (3500.0, 3500.0) GeV
Run details:
- Inclusive QCD at $\sqrt{s} = 7\;\text{TeV}$, $\hat{p_\perp} (or equivalent) greater than 20 GeV
Measurements of dijet azimuthal decorrelations in $pp$ collisions at $\sqrt{s} = 7$ TeV using the CMS detector at the CERN LHC are presented. The analysis is based on an inclusive dijet event sample corresponding to an integrated luminosity of 2.9/pb. Jets are anti-$k_t$ with $R = 0.5$, $p_\perp > 80 (30)$ GeV and $|\eta| < 1.1$.
Source code:
CMS_2011_S8950903.cc
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59 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Tools/BinnedHistogram.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/FastJets.hh"
namespace Rivet {
// CMS azimuthal decorrelations
class CMS_2011_S8950903 : public Analysis {
public:
CMS_2011_S8950903() : Analysis("CMS_2011_S8950903") {}
void init() {
FinalState fs;
FastJets akt(fs, FastJets::ANTIKT, 0.5);
declare(akt, "antikT");
{Histo1DPtr tmp; _h_deltaPhi.add( 80., 110., book(tmp, 1, 1, 1));}
{Histo1DPtr tmp; _h_deltaPhi.add(110., 140., book(tmp, 2, 1, 1));}
{Histo1DPtr tmp; _h_deltaPhi.add(140., 200., book(tmp, 3, 1, 1));}
{Histo1DPtr tmp; _h_deltaPhi.add(200., 300., book(tmp, 4, 1, 1));}
{Histo1DPtr tmp; _h_deltaPhi.add(300., 7000., book(tmp, 5, 1, 1));}
}
void analyze(const Event & event) {
const double weight = 1.0;
const Jets& jets = apply<JetAlg>(event, "antikT").jetsByPt();
if (jets.size() < 2) vetoEvent;
if (fabs(jets[0].eta()) > 1.1 || jets[0].pT() < 80.) vetoEvent;
if (fabs(jets[1].eta()) > 1.1 || jets[1].pT() < 30.) vetoEvent;
double dphi = deltaPhi(jets[0].momentum(), jets[1].phi());
_h_deltaPhi.fill(jets[0].pT(), dphi, weight);
}
void finalize() {
for (Histo1DPtr histo : _h_deltaPhi.histos()) {
normalize(histo, 1.);
}
}
private:
BinnedHistogram _h_deltaPhi;
};
// This global object acts as a hook for the plugin system
DECLARE_RIVET_PLUGIN(CMS_2011_S8950903);
}
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