Abstract
Non-standard physics which can be described by effective four fermion interactions may be an additional source of CP violation in the neutrino propagation. We discuss the detectability of such a CP violation at a neutrino factory. We assume the current baseline setup of the international design study of a neutrino factory (IDS-NF) for the simulation. We find that the CP violation from certain non-standard interactions is, in principle, detectable significantly below their current bounds – even if there is no CP violation in the standard oscillation framework. Therefore, a new physics effect might be mis-interpreted as the canonical Dirac CP violation, and a possibly even more exciting effect might be missed.
Highlights
Physics beyond the Standard Model may introduce non-standard interactions (NSI) [1,2,3,4,5] suppressed by a higher energy scale
As a small modification of the international design study of a neutrino factory (IDS-NF) baseline setup, we do not include the emulsion cloud chamber for ντ detection at the short baseline, since it has been demonstrated in Ref. [25] that it hardly contributes to the standard oscillations (SO) and NSI sensitivities if two baselines are used
What would such a fit look like, and when would one confuse the NSI-CPV with the SO-CPV? Since φm μτ is measured in the disappearance channel, which is hardly affected by δCP, we focus on φm eτ
Summary
Physics beyond the Standard Model may introduce non-standard interactions (NSI) [1,2,3,4,5] suppressed by a higher energy scale Such new physics is usually described by effective dimension six [6,7,8] and eight [9,10] operators. The necessary conditions for an underlying model producing such large NSI are discussed elsewhere [13,16] Since these interactions will be suppressed by at least a factor of Λ2 (cf., Eq (1)), it might be plausible to look for NSI-CPV in the best discussed neutrino oscillation experiments which are sensitive to the highest Λ-scales, such. Since there is no model-independent connection between source or detection and propagation NSI [13] and there is not yet any near detector specification for the neutrino factory within the international design study, we do not discuss source and propagation NSI
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