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Global analysis of nuclear parton distributions

Daniel de Florian*

Rodolfo Sassot† and Pia Zurita‡

Marco Stratmann§

  • Departamento de Física and IFIBA, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 1 (1428) Buenos Aires, Argentina and Institut für Theoretische Physik, Universität Zürich, CH-8057 Zürich, Switzerland

  • Departamento de Física and IFIBA, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabelĺon 1 (1428) Buenos Aires, Argentina

  • Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA

  • *deflo@df.uba.ar
  • †sassot@df.uba.ar
  • ‡marco@bnl.gov
  • §pia@df.uba.ar
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Phys. Rev. D 85, 074028 – Published 25 April, 2012

DOI: https://doi.org/10.1103/PhysRevD.85.074028

Abstract

We present a new global QCD analysis of nuclear parton distribution functions and their uncertainties. In addition to the most commonly analyzed data sets for the deep-inelastic scattering of charged leptons off nuclei and Drell-Yan dilepton production, we include also measurements for neutrino-nucleus scattering and inclusive pion production in deuteron-gold collisions. The analysis is performed at next-to-leading order accuracy in perturbative QCD in a general mass variable flavor number scheme, adopting a current set of free nucleon parton distribution functions, defined accordingly, as reference. The emerging picture is one of consistency, where universal nuclear modification factors for each parton flavor reproduce the main features of all data without any significant tension among the different sets. We use the Hessian method to estimate the uncertainties of the obtained nuclear modification factors and examine critically their range of validity in view of the sparse kinematic coverage of the present data. We briefly present several applications of our nuclear parton densities in hard nuclear reactions at BNL-RHIC, CERN-LHC, and a future electron-ion collider.

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Phys. Rev. D 85, 074028– Published 25 April, 2012
  • Received 4 January 2012
Article part of CHORUS

© 2012 American Physical Society

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