Abstract
We investigate the capability of the DUNE near detector (ND) to constrain nonstandard interaction parameters (NSIs) describing the production of neutrinos $({ϵ}_{\ensuremath{\alpha}\ensuremath{\beta}}^{s})$ and their detection $({ϵ}_{\ensuremath{\alpha}\ensuremath{\beta}}^{d})$. We show that the DUNE ND is able to reject a large portion of the parameter space allowed by DUNE far detector analyses and to set the most stringent bounds from accelerator neutrino experiments on $|{ϵ}_{\ensuremath{\mu}e}^{s,d}|$ for wide intervals of the related phases. We also provide simple analytic understanding of our results as well as a numerical study of their dependence on the systematic errors, showing that the DUNE ND offers a clean environment to study source and detector NSIs.
Highlights
Thanks to the increasing evidence of nonvanishing CP violation in the lepton sector [1], the standard threeneutrino oscillation framework seems to be rather established; the precision on the mixing parameters is above the percentage level [2,3], and this leaves room for effects not described by the standard physics
The detection channels considered in the simulations are (i) νμ CC channel, which is composed by events from νμ → νμ oscillations.—Background to this channel are misidentified ντ charged current (CC) and neutral current (NC) events. (ii) νe CC channel, which is composed by the νμ → νe events and by νe → νe events from the νe beam contamination.—Backgrounds for this channel are misidentified νμ CC, ντ CC, and NC events. (iii) ντ CC channel, which is composed by νμ → ντ events driven by nonstandard interaction operators (NSIs).—As in Refs. [42,44], we have considered events coming from electronic and hadronic τ decays
We have discussed in detail the role of the Deep Underground Neutrino Experiment (DUNE) near detector in constraining some of the source and detector NSI parameters
Summary
Thanks to the increasing evidence of nonvanishing CP violation in the lepton sector [1], the standard threeneutrino oscillation framework seems to be rather established; the precision on the mixing parameters is above the percentage level [2,3], and this leaves room for effects not described by the standard physics. It turns out that selected classes of neutrino experiments are sensitive to subsets of NSI parameters and can be used to constrain some of the entries of the εs;m;d matrices. The bounds refer only to the moduli of the five parameters εsμe, εsμμ, εsμτ, εdμe, and εdτe, since the dependence on the other source and detector NSI couplings is only subdominant These constraints are further relaxed when propagation NSIs are taken into account in the fit. From previous works which use the DUNE ND data to probe source and detector NSI parameters [43,45], we provide an analytical discussion of our results. In the Appendix, we report our analytical as well as numerical studies of the precision achievable in the measurement of (possible) nonvanishing NSIs
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