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Photon-jet correlations in pp and pp¯ collisions

T. Pietrycki

A. Szczurek

  • Institute of Nuclear Physics, PL-31-342 Cracow, Poland

  • Institute of Nuclear Physics, PL-31-342 Cracow, Poland and University of Rzeszów, PL-35-959 Rzeszów, Poland

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Phys. Rev. D 76, 034003 – Published 6 August, 2007

DOI: https://doi.org/10.1103/PhysRevD.76.034003

Abstract

We compare results of the kt-factorization approach and the next-to-leading order collinear-factorization approach for photon-jet correlations in pp and pp¯ collisions at Relativistic Heavy Ion Collider, Tevatron, and Large Hadron Collider energies. We discuss correlations in the azimuthal angle as well as in the two-dimensional space of transverse momentum of photon and jet. Different unintegrated parton distributions (UPDF) are included in the kt-factorization approach. The results depend on UPDFs used. The standard collinear approach gives a cross section comparable to the kt-factorization approach. For correlations of the photon and any jet the next-to-leading order (NLO) contributions dominate at relatively small azimuthal angles as well as for asymmetric transverse momenta. For correlations of the photon with the leading jet (the one having the biggest transverse momentum) the NLO approach gives zero contribution at ϕ−<π/2, which opens a possibility to study higher-order terms and/or UPDFs in this region.

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Phys. Rev. D 76, 034003– Published 6 August, 2007
  • Received 20 April 2007

© 2007 American Physical Society

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