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Matter effect in $P_{\mu \tau}$ at long baselines

Srubabati Goswami, Supriya Pan, Animesh Chatterjee

SciPost Phys. Proc. 17, 017 (2025) · published 23 July 2025

Proceedings event

17th International Workshop on Tau Lepton Physics

Abstract

In the simple two-generation case, the probability $P_{\mu \tau}$ is not affected by interactions of neutrinos in matter. But for three-generation case, at baselines of the order of 9000 km, matter effects become important for this channel. This is a genuine three-flavour effect. We study how the presence of non-standard interactions (NSI) alters the $P_{\mu \tau}$ at these baselines. We observe large deviations from the standard matter effect. In particular, we find energies and baselines for which the phases governing the NSIs do not play any role. This may facilitate a better determination of NSI parameters if tau neutrinos can be detected.


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