Cosmic Ray Bounds on Violation of Lorentz Invariance

Details Cosmic Ray Bounds on Violation of Lorentz Invariance Cosmic Ray Bounds on Violation of Lorentz Invariance

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icrc....2..360c&link_type=abstract

Proceedings of the 26th International Cosmic Ray Conference. August 17-25, 1999. Salt Lake City, Utah, USA. Under the auspices o

Physics

Scientific paper

Recently Coleman and Glashow [Coleman and Glashow 1997] have developed a model which allows the introduction of a small violation of Lorentz invariance. Observational signatures arise because this interaction also violates flavor conservation and allows the radiative decay of the muon, ! e + , whose branching ratio increases as b 4 where is the Lorentz factor of the muon with respect to the reference frame in which the dipole anisotropy of the universal microwave radiation vanishes. In this paper we place a bound on the Lorentz invariance violating parameter,b, of b 10,25 based on observations of horizontal air showers with ne 5 x 106 . Similar considerations of cosmic ray neutrinos in the atmosphere improve these bounds by twenty orders of magnitude.

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