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Prompt J/ψ production in the Regge limit of QCD: From the Tevatron to the LHC

V. A. Saleev*

M. A. Nefedov† and A. V. Shipilova‡

  • II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany and Samara State University, Academic Pavlov Street 1, 443011 Samara, Russia

  • Institut f. Kernphysik, Forschungszentrum Juelich, 52425 Juelich, Germany and Samara State University, Academic Pavlov Street 1, 443011 Samara, Russia

  • *saleev@ssu.samara.ru, saleev@mail.desy.de
  • †nefedovma@gmail.com
  • ‡alexshipilova@ssu.samara.ru
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Phys. Rev. D 85, 074013 – Published 10 April, 2012

DOI: https://doi.org/10.1103/PhysRevD.85.074013

Abstract

We study prompt J/ψ-meson hadroproduction invoking the hypothesis of gluon Reggeization in t-channel exchanges at high energy and the factorization formalism of nonrelativistic quantum chromodynamics at the leading order in the strong-coupling constant αs and the relative velocity of quarks v. The transverse-momentum distribution of direct and prompt J/ψ-meson production measured at the Fermilab Tevatron fitted to obtain the nonperturbative long-distance matrix elements, which are used to predict prompt J/ψ production spectra at the CERN LHC. At the numerical calculation, we adopt the Kimber-Martin-Ryskin and Blümlein prescriptions to derive unintegrated gluon distribution function of the proton from their collinear counterpart, for which we use the Martin-Roberts-Stirling-Thorne set. Without adjusting any free parameters, we find good agreement with measurements by the ATLAS, CMS and LHCb Collaborations at the LHC at the hadronic c.m. energy S=7  TeV.

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Phys. Rev. D 85, 074013– Published 10 April, 2012
  • Received 16 December 2011

© 2012 American Physical Society

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