Universal Structure of Twist-3 Soft-Gluon-Pole Cross Sections for Single Transverse-Spin Asymmetry

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dc.creatorKoike, Yuji
dc.creatorTanaka, Kazuhiro
dc.date2007-03-16
dc.date2007-05-16
dc.date.accessioned2026-07-07T11:22:50Z
dc.date.available2026-07-07T11:22:50Z
dc.descriptionWe prove that twist-3 soft-gluon-pole (SGP) cross section for single spin asymmetries (SSA) is determined by a certain ``primordial'' twist-2 cross section up to kinematic and color factors in the leading order perturbative QCD. In particular, for the processes in which the partonic hard scattering occurs among massless partons, the invariance of the ``primordial'' partonic cross section under scale transformation leads to remarkable simplification of the SGP cross section, reproducing compact form that was recently observed for pion production $p^\uparrow p\to πX$ and direct-photon production $p^\uparrow p\to γX$.
dc.description5 pages in LaTex. 2 figures. Minor modifications in the text
dc.identifierhttps://arxiv.org/abs/hep-ph/0703169
dc.identifierhttp://arxiv.org/abs/hep-ph/0703169
dc.identifierPhys.Rev.D76:011502,2007
dc.identifierdoi:10.1103/PhysRevD.76.011502
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/194705
dc.subjectHigh Energy Physics - Phenomenology
dc.titleUniversal Structure of Twist-3 Soft-Gluon-Pole Cross Sections for Single Transverse-Spin Asymmetry
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