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arXiv · 2609.19574

T-odd Effect from Two-Photon Exchange in SIDIS at Low Transverse Momentum

J. P. Ma·G. P. Zhang
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Abstract

We study T-odd effects through two-photon exchange in semi-inclusive deeply inelastic scattering in the kinematic region where the produced hadron has a low transverse momentum. The absorptive part of lepton-quark scattering amplitude is calculated. Transverse momentum dependent factorization is performed with the absorptive part. Although the absorptive part is divergent, the physical results, i.e., the obtained differential cross-section, is finite. Including the T-odd effects, the differential cross section receives new contributions which have different angular dependence than that obtained with one-photon exchange. Certain asymmetries can be introduced to detect the T-odd effects. Our results here are not only relevant to detecting new effect beyond the one-photon approximation in the process but also relevant to searching for new physics at lepton-proton colliders.

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J. P. Ma, G. P. Zhang. 2026-09-17. T-odd Effect from Two-Photon Exchange in SIDIS at Low Transverse Momentum. https://arxiv.org/abs/2609.19574

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