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  • Open Access

Parity violation on longitudinal single-spin asymmetries at the EicC

Yong Du*

  • *Contact author: yongdu5@impcas.ac.cn
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Phys. Rev. D 111, 116026 – Published 27 June, 2025

DOI: https://doi.org/10.1103/b8tr-9mcw

Abstract

We explore two longitudinal single-spin asymmetries induced from parity violation in neutral-current deep inelastic scattering at the proposed electron-ion collider in China (EicC): APVe(p) from longitudinally polarized (unpolarized) electrons scattering off unpolarized (longitudinally polarized) protons. We find APVe, of O(10−4), is generically 1 to 3 orders of magnitude larger than APVp. We further estimate different uncertainty sources including statistics, parton distribution functions, and beam polarization, for both asymmetries, and then identify individually their dominance in different regimes of the Bjorken-x. Based on these results, we then advocate utilizing APVp for the extraction of the weak mixing angle at two representative momentum transfer scales unexplored before, and we find a relative precision below 10% can be achieved at the EicC with an effective one-year operation time.

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Phys. Rev. D 111, 116026– Published 27 June, 2025
  • Received 12 March 2025
  • Accepted 13 June 2025
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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.

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