Light Dark Sectors through the Fermion Portal

Article
Report number	arXiv:2001.01490 ; CERN-TH-2020-002 ; CERN-TH-2020-003
Title	Light Dark Sectors through the Fermion Portal
Author(s)	Darmé, Luc (Frascati) ; Ellis, Sebastian A.R. (SLAC) ; You, Tevong (CERN ; Cambridge U., DAMTP ; Cambridge U.)
Publication	2020-07-08
Imprint	2020-01-06
Number of pages	56
Note	56 pages, 15 figures, DarkEFT public code available at https://github.com/Luc-Darme/DarkEFT. References added, matches published version on JHEP
In:	JHEP 2007 (2020) 053
DOI	10.1007/JHEP07(2020)053
Subject category	hep-ex ; Particle Physics - Experiment ; hep-ph ; Particle Physics - Phenomenology
Abstract	Pairs of Standard Model fermions form dimension-3 singlet operators that can couple to new dark sector states. This "fermion portal" is to be contrasted with the lower-dimensional Higgs, vector and neutrino singlet portals. We characterise its distinct phenomenology and place effective field theory bounds on this framework, focusing on the case of fermion portals to a pair of light dark sector fermions. We obtain current and projected limits on the dimension-6 effective operator scale from a variety of meson decay experiments, missing energy and long-lived particle searches at colliders, as well as astrophysical and cosmological bounds. The DarkEFT public code is made available for recasting these limits, which we illustrate with various examples including an integrated-out heavy dark photon.
Copyright/License	publication: © 2020-2024 The Authors (License: CC-BY-4.0) preprint: (License: arXiv nonexclusive-distrib 1.0)