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Measurement of dijet azimuthal decorrelation in pp collisions at $\sqrt{s}=8\,\mathrm{TeV} $

The CMS collaboration
Eur.Phys.J. C76 (2016) 536, 2016

Abstract (data abstract)
CERN-LHC. A measurement of the decorrelation of azimuthal angles between the two jets with the largest transverse momenta is presented for seven regions of leading jet transverse momentum up to 2.2 TeV. The analysis is based on the proton-proton collision data collected with the CMS experiment at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 19.7 fb^{-1}. The dijet azimuthal decorrelation is caused by the radiation of additional jets and probes the dynamics of multijet production. The results are compared to fixed-order predictions of perturbative quantum chromodynamics (QCD), and to simulations using Monte Carlo event generators that include parton showers, hadronization, and multiparton interactions. Event generators with only two outgoing high transverse momentum partons fail to describe the measurement, even when supplemented with next-to-leading-order QCD corrections and parton showers. Much better agreement is achieved when at least three outgoing partons are complemented through either next-to-leading-order predictions or parton showers. This observation emphasizes the need to improve predictions for multijet production.

  • Table 1

    Data from F 2, F 4

    10.17182/hepdata.74207.v1/t1

    Normalized dijet cross section differential in DeltPhi_{dijet} for 200<p_{T}^{max}<300 GeV region. The error bars on the data points include statistical...

  • Table 2

    Data from F 2, F 4

    10.17182/hepdata.74207.v1/t2

    Normalized dijet cross section differential in DeltPhi_{dijet} for 300<p_{T}^{max}<400 GeV region. The error bars on the data points include statistical...

  • Table 3

    Data from F 2, F 4

    10.17182/hepdata.74207.v1/t3

    Normalized dijet cross section differential in DeltPhi_{dijet} for 400<p_{T}^{max}<500 GeV region. The error bars on the data points include statistical...

  • Table 4

    Data from F 2, F 4

    10.17182/hepdata.74207.v1/t4

    Normalized dijet cross section differential in DeltPhi_{dijet} for 500<p_{T}^{max}<700 GeV region. The error bars on the data points include statistical...

  • Table 5

    Data from F 2, F 4

    10.17182/hepdata.74207.v1/t5

    Normalized dijet cross section differential in DeltPhi_{dijet} for 700<p_{T}^{max}<900 GeV region. The error bars on the data points include statistical...

  • Table 6

    Data from F 2, F 4

    10.17182/hepdata.74207.v1/t6

    Normalized dijet cross section differential in DeltPhi_{dijet} for 900<p_{T}^{max}<1100 GeV region. The error bars on the data points include statistical...

  • Table 7

    Data from F 2, F 4

    10.17182/hepdata.74207.v1/t7

    Normalized dijet cross section differential in DeltPhi_{dijet} for p_{T}^{max}>1100 GeV region. The error bars on the data points include statistical...

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