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

Scientific paper - Original scientific paper

• Author: Ilja Doršner
• Author: Emina Džaferović-Mašić
• Author: Svjetlana Fajfer
• Author: Shaikh Saad
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

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→π0e+ indicates gauge boson mediation, with the potential for observation of p→η0e+ mode. Alternatively, if decay is through p→K+ν― process, it is mediated by a scalar leptoquark, possibly allowing the observation of p→π0μ+. Detection of both p→π0e+ and p→K+ν― could enhance p→π0μ+ through constructive interference. The model predicts inaccessibility of p→π+ν―, p→η0μ+, p→K0e+, and p→K0μ+, 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.

• Keywords (english): grand unification; proton decay
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical Review D
• Numbering: vol. 109, no. 7, 075023
• p-ISSN: 2470-0010
• e-ISSN: 2470-0029
• DOI: https://doi.org/10.1103/PhysRevD.109.075023
• URN:NBN: urn:nbn:hr:217:322379
• Publication: 2024
• Document URL: https://link.aps.org/doi/10.1103/PhysRevD.109.075023
• Type of resource: Text
• Access conditions: Open access
• Public note: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3. Received 6 February 2024. Accepted 21 March 2024. Published 12 April 2024.
• Created on: 2024-08-01 13:17:37