Cosmic-ray fermion decay through tau-antitau emission with Lorentz violation

Abstract

We study CPT and Lorentz violation in the tau-lepton sector of the Standard Model in the context of the Standard-Model Extension, described by a coefficient which is thus far unbounded by experiment. We show that any non-zero value of this coefficient implies that, for sufficiently large energies, standard-model fermions become unstable against decay due to the emission of a pair of tau-antitau leptons. We calculate the induced fermion energy-loss rate and we deduce the first limit on the Lorentz- and CPT-violating coefficient.

arXiv comment20 pages, 2 figures

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Cited by in corpus (7)

• Lorentz violation in Dirac and Weyl semimetals
• Implications of $\text{SU}(2{)}_L$ gauge invariance for constraints on Lorentz violation
• Nonperturbative Lorentz Violation and Field Quantization
• Physical interpretation of large Lorentz violation via Weyl semimetals
• Constraining dimension-six nonminimal Lorentz-violating electron-nucleon interactions with EDM physics
• Indications against dynamical CPT symmetry restoration in quantum gravity
• Constraining EDM and MDM lepton dimension five interactions in the electroweak sector