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New physics searches via beam normal spin asymmetry in Bhabha scattering

Aleksandr Pustyntsev, Muthubharathi S. Ramasamy, and Marc Vanderhaeghen

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Phys. Rev. D 113, 075032 – Published 21 April, 2026

DOI: https://doi.org/10.1103/w2zp-7mdr

Abstract

We examine the sensitivity of the beam normal spin asymmetry in Bhabha scattering to beyond the Standard Model mediators, in the context of the JLab polarized positron program. A key property of this observable is that the Standard Model contribution exhibits a zero crossing at a fixed scattering angle, providing a clean, effectively background-free point for these searches. We consider scalar, vector, and axial vector mediators and present projected bounds, finding that scalar and vector scenarios allow a significant extension of the search ranges beyond existing constraints.

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Phys. Rev. D 113, 075032– Published 21 April, 2026
  • Received 9 December 2025
  • Accepted 1 April 2026
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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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