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Beam single spin asymmetry ALUsinϕR of the dihadron production in SIDIS process

Yanli Li1, Keyang She1, Hui Li2, Xiaoyu Wang1,*, De-Min Li1,†, and Zhun Lu3,‡

  • *Contact author: xiaoyuwang@zzu.edu.cn
  • †Contact author: lidm@zzu.edu.cn
  • ‡Contact author: zhunlu@seu.edu.cn
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Phys. Rev. D 112, 076015 – Published 14 October, 2025

DOI: https://doi.org/10.1103/9fd5-4lxd

Abstract

We study the longitudinal beam single spin asymmetry ALUsinϕR of dihadron production in the semi-inclusive deep inelastic scattering process with a polarized electron beam scattering off an unpolarized proton target. The asymmetry arises from the convolutions of the twist-3 parton distribution function (PDF) e(x) and the twist-2 dihadron fragmentation function (DiFF) H1∢ as well as the twist-2 PDF f1(x) and the twist-3 DiFF G˜∢. Using the spectator model calculations for the twist-3 PDF e(x) and the DiFFs D1,H1∢, and G˜∢, we estimate the beam single spin asymmetry (BSA) ALUsinϕR at the kinematical configuration of CLAS and CLAS12. We find good agreement with z- and Mh-dependencies data, though x- and Q2-dependencies show discrepancies. We include the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi evolution of e(x) and provide predictions for COMPASS, EIC, and EicC. The negligible contribution from f1(x)⊗G˜∢ supports the Wandzura-Wilczek approximation, while our results highlight the importance of QCD evolution in twist-3 PDF analyses.

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Phys. Rev. D 112, 076015– Published 14 October, 2025
  • Received 11 May 2025
  • Accepted 16 September 2025
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