Abstract
We investigate source and detector non-standard neutrino interactions at the proposed ESS$\nu$SB experiment. We analyze the effect of non-standard physics at the probability level, the event-rate level and by a full computation of the ESS$\nu$SB setup. We find that the precision measurement of the leptonic mixing angle $\theta_{23}$ at ESS$\nu$SB is robust in the presence of non-standard interactions, whereas that of the leptonic CP-violating phase $\delta$ is worsened at most by a factor of two. We compute sensitivities to all the relevant source and decector non-standard interaction parameters and find that the sensitivities to the parameters $\varepsilon^s_{\mu e}$ and $\varepsilon^d_{\mu e}$ are comparable to the existing limits in a realistic scenario, while they improve by a factor of two in an optimistic scenario. Finally, we show that the absence of a near detector compromises the sensitivity of ESS$\nu$SB to non-standard interactions.
Highlights
JHEP09(2015)096 the flux predicted by solar models was found [4]
We find that the precision measurement of the leptonic mixing angle θ23 at ESSνSB is robust in the presence of non-standard interactions, whereas that of the leptonic CP-violating phase δ is worsened at most by a factor of two
We have investigated the effects of source and detector NSIs at the proposed neutrino oscillation experiment ESSνSB, with a baseline of 540 km — the source being the European Spallation Source (ESS) in Lund, Sweden and a MEMPHYS-like detector in Garpenberg, Sweden
Summary
The main goal of the proposed ESSνSB experiment is to measure the CP-violating phase δ with high precision. We examine both the impact of the NSI parameters on this δ measurement and the ability of ESSνSB to measure the NSI parameters. The central values of the neutrino parameters ∆m221, |∆m231|, θ12 and θ13 are taken close to their current best-fit values [6,7,8]. The values of θ23 and δ used are different in each case, and are specified in the text. The NSI parameters are of the form εxαβ, where α, β ∈ {e, μ, τ } and x ∈ {s, d}, since the source and detector NSI parameters can be different in general. We have 18 complex NSI parameters, or 36 real NSI parameters, in addition to the standard ones. We find that there is very little qualitative difference between the results in these two cases. In what follows, we show only the NO results
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