MACRO constraints on violation of Lorentz invariance

✍ Scribed by M. Cozzi

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 189 KB
• Volume: 168
• Category: Article
• ISSN: 0920-5632
• DOI: 10.1016/j.nuclphysbps.2007.02.089

✦ Synopsis

The energy spectrum of neutrino-induced upward-going muons in MACRO has been analysed in terms of relativity principles violating effects, keeping standard mass-induced atmospheric neutrino oscillations as the dominant source of νμ → ντ transitions. The data disfavor these exotic possibilities even at a sub-dominant level, and stringent 90% C.L. limits are placed on the Lorentz invariance violation parameter |Δv| < 6 × 10 -24 at sin 2θv = 0 and |Δv| < 2.5 ÷ 5 × 10 -26 at sin 2θv = ±1. These limits can also be re-interpreted as upper bounds on the parameters describing violation of the Equivalence Principle.