Long-lived sterile neutrinos at Belle II in effective field theory

A bstract Large numbers of τ leptons are produced at Belle II. These could potentially decay into sterile neutrinos that, for the mass range under consideration, are typically long-lived, leading to displaced-vertex signatures. Here, we study a displaced-vertex search in the context of the sterile-n...

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Bibliographic Details
Published inThe journal of high energy physics Vol. 2022; no. 4; pp. 57 - 25
Main Authors Zhou, Guanghui, Günther, Julian Y., Wang, Zeren Simon, de Vries, Jordy, Dreiner, Herbi K.
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 08.04.2022
Springer Nature B.V
SpringerOpen
Subjects
Classical and Quantum Gravitation
Decay
Elementary Particles
Experiments
Factories
Field theory
High energy physics
Leptons
Neutrinos
Operators
Phenomenological Models
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Quarks
Regular Article - Theoretical Physics
Relativity Theory
String Theory
Theoretical physics
Phenomenological Models
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Summary:A bstract Large numbers of τ leptons are produced at Belle II. These could potentially decay into sterile neutrinos that, for the mass range under consideration, are typically long-lived, leading to displaced-vertex signatures. Here, we study a displaced-vertex search in the context of the sterile-neutrino-extended Standard Model Effective Field Theory. The production and decay of the sterile neutrinos can be realized via either the standard active-sterile neutrino mixing or higher-dimensional operators in the effective Lagrangian. We perform Monte-Carlo simulations to estimate the Belle II sensitivities to such interactions. We find that Belle II can probe non-renormalizable dimension-six operators involving a single sterile neutrino up to a few TeV in the new-physics scale.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP04(2022)057