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Non-Standard Neutrino Interactions and Neutral Gauge Bosons
by Julian Heeck, Manfred Lindner, Werner Rodejohann, Stefan Vogl
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Submission summary
| Authors (as registered SciPost users): | Julian Heeck |
| Submission information | |
|---|---|
| Preprint Link: | scipost_201812_00042v2 (pdf) |
| Date submitted: | 2019-02-26 01:00 |
| Submitted by: | Heeck, Julian |
| Submitted to: | SciPost Physics |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approach: | Theoretical |
Abstract
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.
Author comments upon resubmission
Current status:
Reports on this Submission
Report #1 by Anonymous (Referee 2) on 2019-3-2 (Invited Report)
- Cite as: Anonymous, Report on arXiv:scipost_201812_00042v2, delivered 2019-03-02, doi: 10.21468/SciPost.Report.851
Report
In v2 of the manuscript and/or the accompanying letter, the authors have addressed all the comments I had raised in my first report. In v2 the discussion of Sec.~3.2 (starting from line 439, and including Fig.~5) has been significantly changed to take into account the constraints from atomic parity violation and rare meson decays that apply when $Z$-$Z^\prime$ mass mixing is present, and had been omitted in v1. Concerning this revised discussion I have two requests, listed below. I believe that, aside from these remaining minor issues, the current manuscript is acceptable for publication.
Requested changes
1) The last equality in Eq. (32) was derived assuming $M_{Z^\prime} \ll M_Z$ (it would be useful to state this explicitly), but then on lines 462-464 the authors apply it when referring to a $Z^\prime$ with mass around $100$ GeV. This should be fixed.
2) There are a few typos: line 451, require -> required; line 456, completions -> completion; line 482, ''LFV decays $\mu \to e$ or $\tau \to e$ sector'' should be clarified; line 484, $q_\phi$ -> $q_{\phi^\prime}$.