gT(x) contribution to single spin asymmetries in SIDIS

Scientific paper - Original scientific paper

• Author: Sanjin Benić
• Author: Yoshitaka Hatta
• Author: Abhiram Kaushik
• Author: Hsiang-nan Li
• Author's institution: University of Zagreb; Faculty of Science
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

Motivated by a novel origin of transverse single spin asymmetry (SSA) in semi-inclusive deep inelastic scattering (SIDIS) uncovered by some of us, we quantitatively investigate its impact on the theoretical understanding of the mechanism responsible for SSA. This new contribution from the quark-initiated channel first appears in two- loop perturbation theory and involves the g_T(x) distribution. We point out another entirely analogous piece from the gluon-initiated channel proportional to the gluon helicity distribution ΔG(x). Both contributions are solely expressed in terms of twist-two polarized parton distribution functions and twist-two fragmentation functions in the Wandzura-Wilczek approximation, such that they can be unambiguously evaluated without introducing free parameters. We make predictions for measurements of the asymmetries AUT at the future electron-ion collider (EIC), and find that AUT associated with the sin(ϕ_h − ϕ_S), sinϕ_S and sin(2ϕ_h − ϕ_S) harmonics can reach up to 1–2% even at the top EIC energy.

• Keywords (english): Single spin asymmetries; SIDIS
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical Review D
• Numbering: vol. 104, no. 9, 094027
• p-ISSN: 2470-0010
• e-ISSN: 2470-0029
• DOI: https://doi.org/10.1103/PhysRevD.104.094027
• URN:NBN: urn:nbn:hr:217:918124
• Publication: 2021-11-18
• Project: Number: UIP-2019-04-5332; Title (croatian): Gluonsko zasićenje u visoko energetskim proton-jezgra sudarima - istraživanje novih fenomenoloških smjernica; Title (english): Gluon saturation in high energy proton-nucleus collisions - exploring new phenomenological directions; Acronym: SAT-PHENO; Leader: Sanjin Benić; Jurisdiction: Croatia; Funding stream: Installation Research Projects
• Document URL: https://link.aps.org/doi/10.1103/PhysRevD.104.094027
• Type of resource: Text
• Access conditions: Open access
• Public note: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3. Received 15 September 2021; accepted 26 October 2021; published 18 November 2021. .
• Created on: 2024-09-18 12:13:46