Feebly Interacting Particles

Feebly interacting particles (FIPs) are defined by their extremely suppressed interactions with the Standard Model (SM) bosons and/or fermions. FIP candidates could be massive (FIMP) or massless and coupled to the SM particles through minimal coupling strength.[1] The light FIPs are theorized to be dark matter candidates, and, they provides an explanation for the origin of neutrino masses and CP symmetry in strong interactions.[2] These particles are potential thermal dark matter candidates extending the model of weakly interacting massive particles. FIP physics is also known as dark-sector physics.[1] In February 2022 massive gravitons have been proposed as feebly Interacting particles candidates.[3][4]

## References

1. ↑ 1.0 1.1 Lanfranchi, Gaia; Pospelov, Maxim; Schuster, Philip (2020-11-04). "The Search for Feebly-Interacting Particles". Annual Review of Nuclear and Particle Science 71: 279–313. doi:10.1146/annurev-nucl-102419-055056.
2. ↑ Agrawal, Prateek; Bauer, Martin; Beacham, James; Berlin, Asher; Boyarsky, Alexey; Cebrian, Susana; Cid-Vidal, Xabier; d'Enterria, David et al. (2021-02-24). "Feebly-interacting particles: FIPs 2020 workshop report". The European Physical Journal C 81 (11): 1015. doi:10.1140/epjc/s10052-021-09703-7. Bibcode: 2021EPJC...81.1015A.
3. ↑ Cai, Haiying; Cacciapaglia, Giacomo; Lee, Seung J. (2022-02-23). "Massive Gravitons as Feebly Interacting Dark Matter Candidates" (in en). Physical Review Letters 128 (8): 081806. doi:10.1103/PhysRevLett.128.081806. ISSN 0031-9007. PMID 35275667. Bibcode: 2022PhRvL.128h1806C. https://link.aps.org/doi/10.1103/PhysRevLett.128.081806.
4. ↑ "Dark matter could be a cosmic relic from extra dimensions" (in en). 2022-04-09. https://www.livescience.com/dark-matter-particles-from-extra-dimensions.

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