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U(1) ′ mediated decays of heavy sterile neutrinos in MiniBooNE.

Ballett, Peter and Pascoli, Silvia and Ross-Lonergan, Mark (2019) 'U(1) ′ mediated decays of heavy sterile neutrinos in MiniBooNE.', Physical review D., 99 (7). 071701(R).

Abstract

The MiniBooNE low-energy excess is a long-standing problem which has received further confirmation with a reanalysis using newly collected data, with the anomaly now at the 4.8σ level. In this paper we propose a novel explanation which advocates a low-energy sector containing Z0 bosons with GeV-scale masses and sterile neutrinos with masses around 100–500 MeV. We show that this scenario provides excellent spectral agreement with the MiniBooNE low-energy excess in the form of Z0 -mediated neutral current production of heavy sterile states, a fraction of whose subsequent decay to eþe− pairs are misidentified as single electronlike electromagnetic showers. Our model inscribes itself in the broad class of models in which sterile neutrinos are charged under new interactions, allowing new couplings to hiddensector physics. Alongside the electronlike MiniBooNE signature this model also predicts a novel, lowbackground, signal in LArTPC detectors such as MicroBooNE consisting of two distinguishable electronlike electromagnetic showers originating from a single vertex.

Item Type:Article
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Available under License - Creative Commons Attribution.
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1103/PhysRevD.99.071701
Publisher statement:Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Date accepted:No date available
Date deposited:12 April 2019
Date of first online publication:10 April 2019
Date first made open access:12 April 2019

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