Light dark sectors through the Fermion portal
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Springer
Received: January 22, Revised: May 25, Accepted: June 18, Published: July 8,
2020 2020 2020 2020
Light dark sectors through the Fermion portal
a
INFN — Laboratori Nazionali di Frascati, via E. Fermi 40, 00044 Frascati, Italy b SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, U.S.A. c CERN, Theoretical Physics Department, Geneva, Switzerland d DAMTP, University of Cambridge, Wilberforce Road, Cambridge, CB3 0WA, U.K. e Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge, CB3 0HE, U.K.
E-mail: [email protected], [email protected], [email protected] 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 integratedout heavy dark photon. Keywords: Beyond Standard Model, Effective Field Theories ArXiv ePrint: 2001.01490
c The Authors. Open Access, Article funded by SCOAP3 .
https://doi.org/10.1007/JHEP07(2020)053
JHEP07(2020)053
Luc Darm´ e,a Sebastian A.R. Ellisb and Tevong Youc,d,e
Contents 1 Introduction
1 5 6 10 13
3 Hunting for the fermion portal’s dark sectors 3.1 Long-lived dark sectors 3.2 Collider and mono-X searches 3.3 Invisible meson decays
15 15 20 22
4 Astrophysical and cosmological limits on the fermion portal 4.1 Limits from Supernova 1987A and stellar cooling 4.2 Early universe and relic density bounds
23 23 24
5 Summary plots and numerical results 5.1 Vector operator 5.2 Axial-vector operator 5.3 Small mass splitting 5.4 Concrete scenario: GeV scale dark photon
27 27 32 34 36
6 Conclusion
37
A Meson decay amplitudes
39
B Available limits and DarkEFT companion code
44
1
Introduction
In recent years, the search for dark matter has broadened beyond weakly-interacting massive particles in the GeV-TeV range. There has been a resurgence of interest in improving experimental sensitivity to sub-GeV dark matter, while much progress has also been made in neutrino experiments (see e.g. refs. [1–3] for recent overviews). In addition to uncovering the nature of dark matter, these searches could open a window onto a rich dark sector that must often accompany it. The dark sector’s experimental signatures often share many similarities with those of dark matter and neutrinos. Moreover, dedicated experiments have been proposed to look specifically for the spectacular signal of long-lived particles decay
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