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arXiv · 2503.04198

Studying Bremsstrahlung in Polarized Background Field at EIC and EicC

Cong Li
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Abstract

We present a quantum-field-theoretical study of bremsstrahlung from an electron propagating in a linearly polarized background photon field. Starting from the photon two-point correlator, the background-modified photon propagator is parameterized via transverse-momentum-dependent photon distributions. Coulomb correction is incorporated through a gauge-link formalism and soft-photon radiation is resummed with a Sudakov factor, yielding an analytic form of the polarized Bethe-Heitler spectrum. Numerical illustrations show a characteristic $\cos 2\phi$ azimuthal modulation of a few percent in the differential distribution, with Sudakov suppression at low transverse momentum and mild Coulomb-induced enhancement at larger $q_\perp$.

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Cong Li. 2025-03-06. Studying Bremsstrahlung in Polarized Background Field at EIC and EicC. https://arxiv.org/abs/2503.04198

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