Gauge and scalar boson mediated proton decay in a predictive SU(5) GUT model

Doršner, Ilja (author), Džaferović-Mašić, Emina (author), Fajfer, Svjetlana (author), Saad, Shaikh (author)

We assess proton decay signatures in the simplest viable $SU(5)$ model with regard to constraints on parameters governing the Standard Model fermion mass spectrum. Experimental signals for all eight two-body proton decay processes result from exchange of two gauge bosons, a single scalar leptoquark, or their combination. Consequently, it enables us to delve into an in-depth anatomy of proton decay modes and anticipate future signatures. Our findings dictate that observing a proton decay into $p \to \pi^0 e^+$ indicates gauge boson mediation, with the potential for observation of $p \to \eta^0 e^+$ mode. Alternatively, if decay is through the $p \to K^+ \bar{\nu}$ process, it is mediated by a scalar leptoquark, possibly allowing the observation of $p \to \pi^0 \mu^+$. Detection of both $p \to \pi^0 e^+$ and $p \to K^+ \bar{\nu}$ could enhance $p \to \pi^0 \mu^+$ through constructive interference. The model predicts inaccessibility of $p \to \pi^+\bar{\nu}$, $p \to \eta^0 \mu^+$, $p \to K^0 e^+$, and $p \to K^0 \mu^+$, regardless of the dominant mediation type, in the coming decades. In summary, through a comprehensive analysis of proton decay signals, gauge coupling unification, and fermion masses and mixing, we both accurately and precisely constrain the parameter space of the $SU(5)$ model in question.

• Language: English
• Keywords: physics of elementary particles
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FMF - Faculty of Mathematics and Physics
• Publication version: Version of Record
• Publication date: 12.04.2024
• Year: 2024
• Number of pages: Str. 075023-1-075023-19
• Numbering: Vol. 109, iss. 7
• PID: 20.500.12556/RUL-155975
• UDC: 539.1
• ISSN on article: 2470-0010
• DOI: 10.1103/PhysRevD.109.075023
• COBISS.SI-ID: 193887491
• Publication date in RUL: 25.04.2024

Record is a part of a journal

• Title: Physical review. D
• Shortened title: Phys. rev., D
• Publisher: American Physical Society
• ISSN: 2470-0010
• COBISS.SI-ID: 29757223

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

Projects

• Funder: ARIS - Slovenian Research and Innovation Agency
• Project number: P1-0035-2019
• Name: Teorija jedra, osnovnih delcev in polj

• Funder: ARIS - Slovenian Research and Innovation Agency
• Project number: N1-0321-2023
• Name: Obarvani skalari v fiziki onkraj standardnega modela