Comment on "Nonuniversality of Transverse Momentum Dependent Parton Distributions at Small x"

Details Comment on "Nonuniversality of Transverse Momentum Dependent Parton Distributions at Small x" Comment on "Nonuniversality of Transverse Momentum Dependent Parton Distributions at Small x"

2010-09-19

arxiv.org/abs/1009.3610v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

2 pages

Scientific paper

We point out that the analysis in arXiv:1003.0482 actually verifies the universality of transverse momentum dependent quark distributions at small $x$, which supports the observation in our earlier work arXiv:0904.4150. Once the gluon exchanges responsible for the additional infrared divergences are factorized and summed into an exponential factor, it can be expressed as a matrix element of Wilson line operators, and treated as a nonperturbative input to the $k_T$ factorization of $pA$ collisions. The same exponential factor has been extracted from $pp$ collisions in arXiv:0904.4150, rendering possible experimental constraints on its behavior from $pp$ processes, and predictions for $pA$ processes.

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