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Non-Standard Neutrino Interactions and Neutral Gauge Bosons
by Julian Heeck, Manfred Lindner, Werner Rodejohann, Stefan Vogl
||High-Energy Physics - Phenomenology
We investigate Non-Standard Neutrino Interactions (NSI) arising from a flavor-sensitive $Z'$ boson of a new $U(1)'$ symmetry. We compare the limits from neutrino oscillations, coherent elastic neutrino--nucleus scattering, and $Z'$ searches at different beam and collider experiments for a variety of straightforward anomaly-free $U(1)'$ models generated by linear combinations of $B-L$ and lepton-family-number differences $L_\alpha-L_\beta$. Depending on the flavor structure of those models it is easily possible to avoid NSI signals in long-baseline neutrino oscillation experiments or change the relative importance of the various experimental searches. We also point out that kinetic $Z$-$Z'$ mixing gives vanishing NSI in long-baseline experiments if a direct coupling between the $U(1)'$ gauge boson and matter is absent. In contrast, $Z$-$Z'$ mass mixing generates such NSI, which in turn means that there is a Higgs multiplet charged under both the Standard Model and the new $U(1)'$ symmetry.
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Author comments upon resubmission
We thank the referees for the additional comments. We've fixed the typos and modified eq. (32) so that it is valid for arbitrary Z' masses. We've further elaborated the discussion below eq. (32). This should address all the questions and issues brought up by the referees.