Gauge invariance, causality and gluonic poles

Abstract

We explore the electromagnetic gauge invariance of the hadron tensor of the Drell-Yan process with one transversely polarized hadron. The special role is played by the contour gauge for gluon fields. The prescription for the gluonic pole in the twist 3 correlator is related to causality property and compared with the prescriptions for exclusive hard processes. As a result of we get the extra contributions, which naively do not have an imaginary phase. The single spin asymmetry for the Drell-Yan process is enhanced by the factor of two.

9 pages, 2 figures; References and acknowledgements added.

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• New contributions to gluon poles in direct photon production
• One-Loop Corrections of Single Spin Asymmetries at Twist-3 in Drell-Yan Processes
• Drell-Yan hadron tensor: contour gauge and gluon propagator
• Collinear Factorization for Single Transverse-Spin Asymmetry in Drell-Yan Processes
• Drell-Yan-like processes and duality
• Constraining gluon poles
• Gauge Invariance and QCD Twist-3 Factorization for Single Spin Asymmetries
• On the decomposition theorem for gluons
• On $\xi$-process for DVCS-amplitude
• Gauge invariance, gluonic poles and single spin asymmetry in Drell-Yan processes
• Single Transverse-Spin Asymmetries in Drell-Yan Processes
• Single Spin Asymmetry in Lepton Angular Distribution of Drell-Yan Processes
• The contour gauge in use: telling untold
• Gluon poles and photon distribution amplitudes in Drell-Yan-like processes
• Parton distributions: Functional complexity and Lorentz parametrization
• Angular distributions in pion-nucleon Drell-Yan process
• Study of Spin through Gluon Poles
• Factorization theorem, gluon poles and new contributions in semi-inclusive processes
• Twist-3 contribution in the Drell-Yan process with tensor-polarized deuteron
• Gauge invariance and gluon poles for direct photon production