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- Title
Thermal regularization of t-channel singularities in cosmology and particle physics: the general case.
- Authors
Iglicki, Michał
- 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 1 2 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.
- Subjects
PHYSICAL cosmology; DARK matter; PARTICLE spin; INFINITE processes
- Publication
Journal of High Energy Physics, 2023, Vol 2023, Issue 6, p1
- ISSN
1126-6708
- Publication type
Article
- DOI
10.1007/JHEP06(2023)006