COHERENT analysis of neutrino generalized interactions
D. Aristizabal Sierra, Valentina De Romeri, N. Rojas

TL;DR
This paper uses COHERENT data to set constraints on all possible Lorentz-invariant neutrino-quark interactions, including non-standard scalar, pseudoscalar, axial, and tensor types, expanding the understanding of neutrino interactions beyond the Standard Model.
Contribution
It provides the first comprehensive constraints on the full set of Lorentz-invariant neutrino-quark generalized interactions using recent experimental data.
Findings
Scalar interactions are most tightly constrained.
Tensor and non-standard vector interactions remain sizable.
Additional vector interactions improve the fit to data.
Abstract
Effective neutrino-quark generalized interactions are entirely determined by Lorentz invariance, so they include all possible four-fermion non derivative Lorentz structures. They contain neutrino-quark non-standard interactions as a subset, but span over a larger set that involves effective scalar, pseudoscalar, axial and tensor operators. Using recent COHERENT data, we derive constraints on the corresponding couplings by considering scalar, vector and tensor quark currents and assuming no lepton flavor dependence. We allow for mixed neutrino-quark Lorentz couplings and consider two types of scenarios in which: (i) one interaction at the nuclear level is present at a time, (ii) two interactions are simultaneously present. For scenarios (i) our findings show that scalar interactions are the most severely constrained, in particular for pseudoscalar-scalar neutrino-quark couplings. In…
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