Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-05-15
Phys.Rev.D75:114014,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages. V. 2: Title change, misprints and minor corrections, as in journal version
Scientific paper
10.1103/PhysRevD.75.114014
We 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.
Collins John
Qiu Jian-Wei
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