Challenges in the extraction of physics beyond the Standard Model from electron scattering
Date
2025
Authors
Wang, X.-G.
Thomas, A.W.
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Journal article
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Journal of Physics G: Nuclear and Particle Physics, 2025; 52(1):015006-1-015006-11
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Xuan-Gong Wang, A W Thomas
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Abstract
Precise measurements of electron and positron scattering, including parity violation, offer great promise in the search for physics beyond the Standard Model (SM). In this context it is crucial to understand the corrections which might arise from charge symmetry violation, as well as the less well known strange and charm quark distributions. Our analysis, using state of the art parton distributions, suggests that these contributions lead to corrections in the extraction of the weak couplings gAV eq and gVA eq of the order (1−2)%, while they are as large as 4% for gAA eq, at a typical scale of Q² = 10 GeV². These results underline the importance of carrying out high precision measurements, which will not only provide information on physics beyond the SM but also reduce the current uncertainties on our knowledge of the strange and charm quark distributions in the proton.
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© 2024 The Author(s). Published by IOP Publishing Ltd. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.