Probing Non-Standard Neutrino Physics at Neutrino Factory and T2KK

2008/05/16 by Minakata, Hisakazu
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.0805.2435

Abstract

We discuss ways to explore non-standard interactions (NSI) which neutrinos may possess by expressing them as effective four Fermi operators with coefficient of the order of (M_W / M_NP)² ~0.01 (0.0001) for energy scales of new physics as M_NP ~1 (10) TeV. Neutrino Factory is a prime candidate for such apparatus that can reach to the extreme precision. I describe a two detector setting, one at baseline L~3000 km and the other at L~7000 km, which is able to solve the notorious theta₁₃-NSI confusion, and possibly also the two-phase confusion. The resultant sensitivities to off-diagonal NSI elements ε's are excellent, |ε_{e tau}| ≃ a few ×10^-3 and |ε_{e mu}| ≃ a few ×10^-4. Our results suggest a new picture of neutrino factory as a hunting machine for NSI while keeping its potential of precision measurement of lepton mixing parameters. Sensitivities to NSI by T2KK and the related settings are also discussed.

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