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

Ballett, Peter; Pascoli, Silvia; Ross-Lonergan, Mark

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.

Citation

Ballett, P., Pascoli, S., & Ross-Lonergan, M. (2019). U(1) ′ mediated decays of heavy sterile neutrinos in MiniBooNE. Physical Review D, 99(7), Article 071701(R). https://doi.org/10.1103/physrevd.99.071701

• Journal Article Type: Article
• Online Publication Date: Apr 10, 2019
• Publication Date: Apr 1, 2019
• Deposit Date: Apr 12, 2019
• Publicly Available Date: Apr 12, 2019
• Journal: Physical Review D
• Print ISSN: 2470-0010
• Electronic ISSN: 2470-0029
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 99
• Issue: 7
• Article Number: 071701(R)
• DOI: https://doi.org/10.1103/physrevd.99.071701
• Public URL: https://durham-repository.worktribe.com/output/1303829