k_T factorization is violated in production of high-transverse-momentum particles in hadron-hadron collisions

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dc.creatorCollins, John
dc.creatorQiu, Jian-Wei
dc.date2007-05-15
dc.date2007-06-28
dc.date.accessioned2026-07-07T10:35:52Z
dc.date.available2026-07-07T10:35:52Z
dc.descriptionWe show that hard-scattering factorization is violated in the production of high-p_T hadrons in hadron-hadron collisions, in the case that the hadrons are back-to-back, so that k_T factorization is to be used. The explicit counterexample that we construct is for the single-spin asymmetry with one beam transversely polarized. The Sivers function needed here has particular sensitivity to the Wilson lines in the parton densities. We use a greatly simplified model theory to make the breakdown of factorization easy to check explicitly. But the counterexample implies that standard arguments for factorization fail not just for the single-spin asymmetry but for the unpolarized cross section for back-to-back hadron production in QCD in hadron-hadron collisions. This is unlike corresponding cases in e^+e^- annihilation, Drell-Yan, and deeply inelastic scattering. Moreover, the result endangers factorization for more general hadroproduction processes.
dc.description10 pages. V. 2: Title change, misprints and minor corrections, as in journal version
dc.identifierhttps://arxiv.org/abs/0705.2141
dc.identifierhttp://arxiv.org/abs/0705.2141
dc.identifierPhys.Rev.D75:114014,2007
dc.identifierdoi:10.1103/PhysRevD.75.114014
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/179867
dc.subjectHigh Energy Physics - Phenomenology
dc.titlek_T factorization is violated in production of high-transverse-momentum particles in hadron-hadron collisions
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