Physics of Atomic Nuclei

, Volume 68, Issue 4, pp 661–676 | Cite as

Why breakup of photons and pions into forward dijets is so different: Predictions from nonlinear nuclear k factorization

  • N. N. Nikolaev
  • W. Schäfer
  • B. G. Zakharov
  • V. R. Zoller
On the 70th Anniversary of Yurii Antonovich Simonov

Abstract

Based on an approach to non-Abelian propagation of color dipoles in a nuclear medium, we formulate a nonlinear k factorization for the breakup of photons and pions into forward hard dijets in terms of the collective Weizsäcker-Williams glue of nuclei. We find quite distinct practical consequences of nonlinear nuclear k factorization for interactions of pointlike photons and nonpointlike pions. In the former case, the large transverse momentum p of jets comes from the intrinsic momentum of quarks and antiquarks in the photon, and nuclear effects manifest themselves as an azimuthal decorrelation with an acoplanarity momentum of the order of the nuclear saturation momentum QA. In the breakup of pions off free nucleons to the leading order in pQCD, the spectator parton has a small transverse momentum and the hard dijet cross section is suppressed. In the breakup of pions off heavy nuclei, the forward hard jets are predicted to be entirely decorrelated. We comment on the sensitivity of the pionic dijet cross section to the pion distribution amplitude. The predicted distinction between the breakup of photons and pions can be tested by the sphericity and thrust analysis of the forward hadronic system in the COMPASS experiment at CERN.

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Copyright information

© Pleiades Publishing, Inc. 2005

Authors and Affiliations

  • N. N. Nikolaev
    • 1
    • 2
  • W. Schäfer
    • 1
  • B. G. Zakharov
    • 2
  • V. R. Zoller
    • 3
  1. 1.IKPForschungszentrum JülichGermany
  2. 2.Landau Institute for Theoretical PhysicsRussian Academy of SciencesChernogolovkaRussia
  3. 3.Institute for Theoretical and Experimental PhysicsMoscowRussia

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