Dark neutrinos and a three-portal connection to the standard model

Ballett, Peter; Hostert, Matheus; Pascoli, Silvia

Abstract

We introduce a dark neutrino sector which respects a hidden Uð1Þ0 gauge symmetry, subsequently broken by the vacuum expectation value of a dark scalar. The model is a self-consistent realization of an extended hidden sector that communicates with the standard model only via the three renormalizable portals, namely, neutrino, vector and scalar mixing. The interplay between portal couplings leads to several novel signatures in heavy neutrino, dark photon, and dark scalar searches, typically characterized by multileptons plus missing energy and displaced vertices. A striking signature arises in kaon factories such as NA62, where Kþ → lþ α νlþ β l− β decays could reveal a heavy neutrino and a light dark photon resonance above backgrounds. Given the open parameter space, we also comment on recent ideas to explain outstanding experimental anomalies, and how they would fit into our proposed model. A minimal extension of the model, possibly motivated by anomaly cancellation, can accommodate a dark matter candidate strongly connected to the neutrino sector.

Citation

Ballett, P., Hostert, M., & Pascoli, S. (2020). Dark neutrinos and a three-portal connection to the standard model. Physical Review D, 101(11), Article 115025. https://doi.org/10.1103/physrevd.101.115025

• Journal Article Type: Article
• Acceptance Date: Jun 2, 2020
• Online Publication Date: Jun 19, 2020
• Publication Date: 2020-06
• Deposit Date: Jul 8, 2020
• Publicly Available Date: Jul 8, 2020
• Journal: Physical Review D
• Print ISSN: 2470-0010
• Electronic ISSN: 2470-0029
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 101
• Issue: 11
• Article Number: 115025
• DOI: https://doi.org/10.1103/physrevd.101.115025
• Public URL: https://durham-repository.worktribe.com/output/1298524