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A perturbative QCD study of dijets in p+Pb collisions at the LHC

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Abstract

Inspired by the recent measurements of the CMS collaboration, we report a QCD study of dijet production in proton+lead collisions at the LHC involving large-transverse-momentum jets, p T  ≳ 100 GeV. Examining the inherent uncertainties of the next-to-leading order perturbative QCD calculations and their sensitivity to the free proton parton distributions (PDFs), we observe a rather small, typically much less than 5% clearance for the shape of the dijet rapidity distribution within approximately 1.5 units around the midrapidity. Even a more stable observable is the ratio between the yields in the positive and negative dijet rapidity, for which the baseline uncertainty can be made negligible by imposing a symmetric jet rapidity acceptance. Both observables prove sensitive to the nuclear modifications of the gluon distributions, the corresponding uncertainties clearly exceeding the estimated baseline uncertainties from the free-proton PDFs and scale dependence. From a theoretical point of view, these observables are therefore very suitable for testing the validity of the collinear factorization and have a high potential to provide precision constraints for the nuclear PDFs.

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Authors and Affiliations

  1. Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland

    Kari J. Eskola & Hannu Paukkunen

  2. Helsinki Institute of Physics, University of Helsinki, P.O. Box 64, FI-00014, Helsinki, Finland

    Kari J. Eskola & Hannu Paukkunen

  3. Departamento de Física de Partículas and IGFAE, Universidade de Santiago de Compostela, E-15782, Santiago de Compostela, Galicia, Spain

    Carlos A. Salgado

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  1. Kari J. Eskola
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  2. Hannu Paukkunen
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Correspondence to Hannu Paukkunen.

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ArXiv ePrint: 1308.6733

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Eskola, K.J., Paukkunen, H. & Salgado, C.A. A perturbative QCD study of dijets in p+Pb collisions at the LHC. J. High Energ. Phys. 2013, 213 (2013). https://doi.org/10.1007/JHEP10(2013)213

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