Journal
PHYSICAL REVIEW D
Volume 92, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.92.025007
Keywords
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Funding
- Helmholtz Alliance for Astroparticle Physics HAP - Initiative and Networking Fund of the Helmholtz Association
- German Research Foundation (DFG) [KL 1103/4-1]
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We have performed a calculation in the parton-model approximation of a nonstandard decay process in isotropic modified Maxwell theory coupled to standard Dirac theory, with a single Lorentz-violating parameter. in the photonic sector. Previous calculations of this process (vacuum Cherenkov radiation by a proton for the theory with kappa > 0) were performed for pointlike particles, and an upper bound on kappa at the 10(-19) level was obtained from experimental data on ultra-high-energy cosmic rays. The parton-model results change the decay rate by about an order of magnitude but give the same upper bound on kappa because the threshold energy is unchanged. The previous point-particle calculation of photon decay into an electron-positron pair for the theory with kappa < 0 remains valid, and experimental results on cosmic gamma rays provide a lower bound on kappa at the -10(-15) level.
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