Freezing In with Lepton Flavored Fermions
arXiv:2103.03886 · doi:10.21468/SciPostPhys.11.1.006
Abstract
Dark, chiral fermions carrying lepton flavor quantum numbers are natural candidates for freeze-in. Small couplings with the Standard Model fermions of the order of lepton Yukawas are `automatic' in the limit of Minimal Flavor Violation. In the absence of total lepton number violating interactions, particles with certain representations under the flavor group remain absolutely stable. For masses in the GeV-TeV range, the simplest model with three flavors, leads to signals at future direct detection experiments like DARWIN. Interestingly, freeze-in with a smaller flavor group such as is already being probed by XENON1T.
arXiv commentv2: 23 pages, 4 figures; updated fig. 2, added references, and clarified arguments in section III-A. Results unchanged. Matches version published in SciPost Physics
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