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• W3112793088 abstract "Dark Matter (DM) and its potential interactions with the Standard Model (SM) continue to present a rich framework for model building. In the case of thermal DM of a mass between a few MeV and a few GeV, a compelling and much-explored framework is that of a photon/vector portal, which posits a new $U(1)$ dark that undergoes small kinetic mixing (KM) with the SM hypercharge. This mixing can be mediated at the one-loop level by portal matter (PM) fields which are charged under both the $U(1)$ and the SM gauge group. From requirements for a lack of gauge anomalies and lifetime constraints from early-universe cosmology, it is favored that fermionic portal matter take the form of vector-like copies of SM particles, albeit non-trivially charged under the $U(1)$, which have delicate cancellations of $U(1)$ charges and SM hypercharges in order to yield a finite and calculable KM. The distinctive particle content of PM models then presents an intriguing framework with which one may postulate on the UV completions of a simplified model with the photon portal, including those which may embed the $U(1)$ in a larger group structure. We construct a model in which the $U(1)$ is extended to $SU(4)_F times U(1)_F$, incorporating a local $SU(3)$ flavor symmetry with PM appearing as a vector-like fourth generation to supplement the three generations of the SM. To ensure finite contributions to KM, the SM gauge group is arranged into Pati-Salam multiplets. The new extended gauge group presents a variety of interesting experimental signatures, including non-trivial consequences of the flavor symmetry being unified with the sector." @default.
• W3112793088 created "2020-12-21" @default.
• W3112793088 creator A5029905577 @default.
• W3112793088 creator A5037301786 @default.
• W3112793088 date "2020-12-11" @default.
• W3112793088 modified "2023-09-27" @default.
• W3112793088 title "$SU(4)$ Flavorful Portals" @default.
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• W3112793088 hasPublicationYear "2020" @default.
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