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Non-universality of transverse Coulomb exchange at small x

J. Aichelin·F. Arleo·P. -B. Gossiaux·T. Gousset·S. Peigne·M. Thomas
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Abstract

Within an explicit scalar QED model we compare, at fixed x << 1, the leading-twist K_T-dependent `quark' distribution f_q(x, K_T) probed in deep inelastic scattering and Drell-Yan production, and show that the model is consistent with the universality of f_q(x, K_T). The extension of the model from the aligned-jet to the 'symmetric' kinematical regime reveals interesting properties of the physics of Coulomb rescatterings when comparing DIS and DY processes. At small x the transverse momentum induced by multiple scattering on a single centre is process dependent, as well as the transverse momentum broadening occurring in collisions on a finite size nuclear target.

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J. Aichelin, F. Arleo, P. -B. Gossiaux, T. Gousset, S. Peigne, M. Thomas. 2005-05-09. Non-universality of transverse Coulomb exchange at small x. https://doi.org/10.1103/physrevd.72.054010

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