PoS - Proceedings of Science
Volume 456 - 25th International Symposium on Spin Physics (SPIN2023) - Low Energy Spin Physics with Lepton, Photon and Hadron Probes
Beam normal single-spin asymmetry in electron-proton scattering with intermediate state resonances
P. Blunden*, J. Ahmed and W. Melnitchouk
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Published on: July 30, 2024
Abstract
This contribution highlights results from our recent calculations of beam normal single-spin asymmetries in electron–proton elastic scattering that depend on the imaginary (absorptive) part of two-photon exchange amplitudes. The intermediate hadronic states are modelled by spin 1/2 and 3/2 resonance states below 1.8 GeV in mass. CLAS exclusive meson electroproduction data are used as input for the transition amplitudes from the proton to the resonance states, and we also include the effect of resonance widths. We compare results with data from the SAMPLE, A4, and Qweak experiments.
DOI: https://doi.org/10.22323/1.456.0179
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