Global Analysis of the Source and Detector Nonstandard Interactions Using the Short Baseline Neutrino- and Antineutrino-Electron Scattering Data

Abstract

We present a global analysis of the semileptonic and purely Leptonic nonuniversal and flavor-changing nonstandard neutrino interactions in all the known short-baseline neutrino- and antineutrino-electron scattering experiments. The nonstandard effects at the source and at the detector can be more transparent in these experiments because of the negligibly small ratio between the baselines and the neutrino energies, which is not enough for the neutrinos to oscillate, and thus can be sensitive to the new physics at the both ends. We use data from two electron-neutrino electron scattering experiments and six electron-antineutrino electron scattering experiments and combine them to find the best fits on the nonstandard parameters using the source-only, detector-only analyses, and then find the interplay between the two cases. The bounds obtained in some cases are stronger and new, in some cases comparable to the current ones, and in the other cases weaker. For instance, the bound obtained from the interplay between the source and detector nonstandard physics on the nonstandard parameter ε_{ee}^{udL} at the source is much stronger and is comparable with the indirect bound, but the bounds on the parameters ε_{μe}^{udL} and ε_{τe}^{udL} are weaker in this study in comparison with the indirect bounds. We also find a global fit on the standard weak mixing angle sinθ_{W}=0.249+-0.020 with 2% improvement in its precision in comparison with the previous studies.

arXiv comment12 pages, 6 figures,5 tables, NSI study in elastic scatterings, published in Physical Review D

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