Correlating $0\nu\beta\beta$ decays and flavor observables in leptoquark models

Fajfer, Svjetlana (author), Leal, L. P. S. (author), Sumensari, Olcyr (author), Zukanovich Funchal, R. (author)

In this paper, we investigate minimal scalar leptoquark models that dynamically generate neutrino Majorana masses at the one-loop level and examine their implications for low-energy processes. We show that these models can produce viable neutrino masses, consistent with neutrino oscillation and cosmological data. By using leptoquark couplings f ixed by neutrino data, we predict additional contributions to neutrinoless double-beta decays ($0\nu\beta\beta$), which are chirality enhanced and compete with the standard contributions from the Majorana masses. Our analysis demonstrates that these effects are sizable for leptoquark masses as large as $\mathcal{O}$(300 TeV), potentially increasing or decreasing the $0\nu\beta\beta$ half-life, and creating an ambiguity between the normal and inverted mass ordering scenarios. Furthermore, we explore the correlation between $0\nu\beta\beta$ and flavor observables, such as kaon decays and $\mu \to e$ conversion in nuclei, emphasizing that the latter is complementary to $0\nu\beta\beta$ decays.

• Language: English
• Keywords: physics of elementary particles, leptoquarks
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FMF - Faculty of Mathematics and Physics
• Publication status: Published
• Publication version: Version of Record
• Year: 2025
• Number of pages: 30 str.
• Numbering: Vol. 2025, art. no. 147
• PID: 20.500.12556/RUL-167169
• UDC: 539.120
• ISSN on article: 1029-8479
• DOI: 10.1007/JHEP01(2025)147
• COBISS.SI-ID: 225671939
• Publication date in RUL: 11.02.2025

Record is a part of a journal

• Title: The journal of high energy physics
• Shortened title: J. high energy phys.
• Publisher: SISSA
• ISSN: 1029-8479
• COBISS.SI-ID: 1314148

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: fizika osnovnih delcev, leptokvarki