2007/03/31 by Hiroyuki Kawamura, Jiro Kodaira, Kazuhiro Tanaka · 2 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1016/j.nuclphysb.2007.04.022
published as Nucl.Phys.B777:203-225,2007 · 26 pages, 12 figures, typos corrected, references added, version to appear in Nucl. Phys. B
openalex publication_date 2007/04/30 · arxiv created 2007/05/18 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We calculate the double transverse-spin asymmetries, \aqt, in transversely polarized Drell-Yan process at the transverse-momentum QT of the produced lepton pair. We perform all-order resummation of the logarithmically enhanced contributions in the relevant Drell-Yan cross sections at small QT, which are due to multiple soft gluon emission in QCD, up to the next-to-leading logarithmic accuracy. The asymmetries \aqt to be observed in polarized experiments at RHIC and J-PARC are studied numerically as a function of QT. We show that the effects of the soft gluon resummation to the polarized and unpolarized cross sections largely cancel in \aqt, but the significant corrections still remain and are crucial for making a reliable QCD prediction of \aqt. In particular, the soft gluon corrections enhance \aqt considerably in the small QT region compared with the asymmetry in the fixed-order αs perturbation theory. We also derive a novel asymptotic formula which embodies those remarkable features of \aqt at small QT in a compact analytic form and is useful to extract the transversity δq(x) from the experimental data.