Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-01-18
Phys.Rev.D81:094006,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages, 11 figures, typos fixed and minor explanations added, version to appear in Physical Review D
Scientific paper
10.1103/PhysRevD.81.094006
It has by now been established that standard QCD factorization using transverse momentum dependent parton distribution functions fails in hadro-production of nearly back-to-back hadrons with high transverse momentum. The essential problem is that gauge invariant transverse momentum dependent parton distribution functions cannot be defined with process-independent Wilson line operators, thus implying a breakdown of universality. This has led naturally to proposals that a correct approach is to instead use a type of "generalized" transverse momentum dependent factorization in which the basic factorized structure is assumed to remain valid, but with transverse momentum dependent parton distribution functions that contain non-standard, process dependent Wilson line structures. In other words, to recover a factorization formula, it has become common to assume that it is sufficient to simply modify the Wilson lines in the parton correlation functions for each separate hadron. In this paper, we will illustrate by direct counter-example that this is not possible in a non-Abelian gauge theory. Since a proof of generalized transverse momentum dependent factorization should apply generally to any hard hadro-production process, a single counter-example suffices to show that a general proof does not exist. Therefore, to make the counter-argument clear and explicit, we illustrate with a specific calculation for a double spin asymmetry in a spectator model with a non-Abelian gauge field. The observed breakdown of generalized transverse momentum dependent factorization challenges the notion that the role of parton transverse momentum in such processes can be described using separate correlation functions for each external hadron.
Mulders Piet J.
Rogers Ted C.
No associations
LandOfFree
No Generalized TMD-Factorization in the Hadro-Production of High Transverse Momentum Hadrons does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with No Generalized TMD-Factorization in the Hadro-Production of High Transverse Momentum Hadrons, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and No Generalized TMD-Factorization in the Hadro-Production of High Transverse Momentum Hadrons will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-660565