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arXiv · 2212.00561

Thermal regularization of t-channel singularities in cosmology and particle physics: the general case

Michal Iglicki
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Abstract

This paper presents a~way to regularize the $t$-channel singularity (which appears when a~massive, stable $t$-channel mediator of a~given process is allowed to be on-shell, making the cross section infinite) in a~general case of particles of any spin (0,~\nicefrac12,~1) interacting within a~thermal medium. Those interactions result in a~finite lifetime of the mediator and allow to introduce an~effective momentum- and temperature-dependent width. As a result, the would-be-singular cross section becomes finite. A~complete derivation and an analytical result for the width are provided. For an illustration, the method is used to calculate the thermal widths and cross sections within the~Vector-Fermion Dark Matter model.

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Michal Iglicki. 2022-12-01. Thermal regularization of t-channel singularities in cosmology and particle physics: the general case. https://doi.org/10.1007/jhep06(2023)006

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