Search for exotic contributions to atmospheric neutrino oscillations

Abstract

The energy spectrum of neutrino-induced upward-going muons in MACRO was analysed in terms of relativity principles violating effects, keeping standard mass-induced atmospheric neutrino oscillations as the dominant effect. The data disfavor these possibilities even at a sub-dominant level; stringent 90% C.L. limits are placed on the Lorentz invariance violation parameter $|\Delta v|<6\times 10^{-24}$ at $\sin 2{\theta }_v$ = 0 and $|\Delta v|<2.5÷5\times 10^{-26}$ at $\sin 2{\theta }_v$ = $\pm$1. The limits can be re-interpreted as bounds on the Equivalence Principle violation parameters.

arXiv commentPresented at the 29th I.C.R.C., Pune, India (2005)

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