Broadening of transverse momentum of partons propagating through a medium

M. B. Johnson, B. Z. Kopeliovich, and A. V. Tarasov
Phys. Rev. C 63, 035203 – Published 2 February 2001
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Abstract

Broadening of the transverse momentum of a parton propagating through a medium is treated using the color dipole formalism, which has the advantage of being a well developed phenomenology in deep-inelastic scattering and soft processes. Within this approach, nuclear broadening should be treated as color filtering, i.e., absorption of large-size dipoles leading to diminishing (enlarged) transverse separation (momentum). We also present a more intuitive derivation based on the classic scattering theory of Molière. This derivation helps one to understand the origin of the dipole cross section, part of which comes from attenuation of the quark, while another part is due to multiple interactions of the quark. It also demonstrates that the lowest-order rescattering term provides an A dependence very different from the generally accepted A1/3 behavior. The effect of broadening increases with energy, and we evaluate it using different phenomenological models for the unintegrated gluon density. Although the process is dominated by soft interactions, the phenomenology we use is tested using hadronic cross section data.

  • Received 23 August 2000

DOI:https://doi.org/10.1103/PhysRevC.63.035203

©2001 American Physical Society

Authors & Affiliations

M. B. Johnson1, B. Z. Kopeliovich2,3, and A. V. Tarasov2,3,4

  • 1Los Alamos National Laboratory, Los Alamos, New Mexico 87545
  • 2Max-Planck Institut für Kernphysik, Postfach 103980, D-69029 Heidelberg, Germany
  • 3Joint Institute for Nuclear Research, Dubna, RU-141980 Moscow Region, Russia
  • 4Institut für Theoretik Physik der Universität, Philosophenweg 19, D-69120 Heidelberg, Germany

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Vol. 63, Iss. 3 — March 2001

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