Probing muonic charged current nonstandard interactions at decay-at-rest facilities in conjunction with T2HK

Abstract

The muon decay-at-rest (μ-DAR) facility provides us with an ideal platform to probe purely muonic charged-current nonstandard neutrino interactions (NSIs). We propose to probe this class of NSI effects using antineutrinos from a μ-DAR source in conjunction with neutrinos from the future Tokai to Kamioka superbeam experiment with megaton hyper Kamiokande detector (T2HK). Even though muonic NSIs are absent in neutrino production at T2HK, we show that our proposed hybrid setup comprising μ-DAR and T2HK helps in alleviating the parameter degeneracies that can arise in data. Analytic considerations reveal that the oscillation probability is most sensitive to the NSI parameter in the μ-e sector. For this parameter, we show that the μ-DAR setup can improve on the existing bounds down to around 0.01, especially when the data are combined with neutrino data from T2HK experiment due to the lifting of parameter degeneracies. The high precision with which μ-DAR can measure δ CP is shown to be robust even in the presence of the considered NSIs. Finally, we show that the combination of μ-DAR along with T2HK can also be used to put mild constraints on the NSI phase in the vicinity of the maximal CP-violating value, for the chosen benchmark value of ε μe μe ¼ 0.01.

Consistent QFT description of non-standard neutrino interactions

“…This fact amplifies the need for a correct treatment of quadratic terms, as ensured by our QFT formalism. To discuss whether the above-given QFT result can be matched to the QM-NSI formalism one needs to specify how the latter describes (anti)neutrino production from muon decay [6,44,45]. Works carried out within the "non-unitary mixing matrix" setup [6] introduce in eq.…”

Constraints on neutrino non-standard interactions from LHC data with large missing transverse momentum

“…f f ,Y αβ and f,Y αβ define the strength of NSIs respectively, α, β ∈ {e, µ, τ }, f denote charged leptons or quarks and P Y is chiral projection operator(P L or P R ). CC NSI modifies the neutrino production and detection through its effect on processes such as muon decay and inverse beta decay [6][7][8]. From those processes severe bound can be obtained [9].…”