NT/RBRC hybrid seminar

"On the odderon mechanism for transverse single spin asymmetry in the Wilczek-Wandzura approximation"

Presented by Prof. Sanjin Benic, Zagreb University

Friday, November 18, 2022, 11:00 am — Hybrid: Building 510, Large Seminar Room

Abstract: I will discuss our recent work [1] where we are revisiting the odderon mechanism for transverse single spin asymmetry (SSA) that was originally suggested by Kovchegov and Sievert [2]. The characteristic point of this mechanism is a very strong nuclear suppression of the asymmetry, ~ A^-7/6 parametrically, that is potentially interesting for phenomenological reasons [3,4]. We first specify the relevant parton distribution function (PDF) as the intrinsic twist-3 gT distribution in agreement with the results in [2] when considered on the parton level. However, we carefully argue that, due to gauge invariance, the complete twist-3 cross section also contains kinematical and dynamical twist-3 PDFs, in addition to the intrinsic PDF. We have explicitly computed the polarized cross section using the Wandzura-Wilczek approximation, where the dynamical twist-3 contribution is dropped. Our finding is that the polarized cross section is exactly zero up to the next-to-leading order in the strong coupling for all possible partonic channels. We finally outline several opportunities by which the odderon mechanism for transverse SSA could be realized after all.

Hosted by: Yoshitaka Hatta

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