Non-universality of transverse Coulomb exchange at small x

Details Non-universality of transverse Coulomb exchange at small x Non-universality of transverse Coulomb exchange at small x

2005-05-09

arxiv.org/abs/hep-ph/0505066v1

Phys.Rev. D72 (2005) 054010

Physics

High Energy Physics

High Energy Physics - Phenomenology

28 pages, 3 eps figures

Scientific paper

10.1103/PhysRevD.72.054010

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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