Asymmetries associated with higher twists: gauge invariance, gluonic poles and twist three

2012/01/12 by I. V. Anikin, Anikin, I. V., O. V. Teryaev +1
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.48550/arxiv.1201.2569

Talk given at XIV International Workshop on High Energy Physics "DSPIN-11", Dubna, Russia, September 20 - 24, 2011

openalex publication_date 2012/01/12 · arxiv created 2012/12/18 · arxiv updated 2012/12/19 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We explore the electromagnetic gauge invariance of the hadron tensor of the Drell-Yan process with one transversely polarized hadron. Due to the special role of the contour gauge for gluon fields, the prescription for the gluonic pole in the twist 3 correlator can be related to the causality prescriptions for exclusive hard processes. Because of this, we find the extra contributions, which naively do not have an imaginary phase. The single spin asymmetry for the Drell-Yan process is accordingly enhanced by the factor of two.

Related

• Single spin asymmetries in the Drell-Yan process
• Twist-three distributions and their appearance in the doubly-polarized Drell-Yan process
• One-loop QCD corrections to SSA in unweighted Drell-Yan processes
• QCD Corrections to the Polarized Drell-Yan Process
• The Role of Gauge Invariance in Single-Spin Asymmetries