Parameter space exploration of the minimal SU(5) unificatio

Scientific paper - Original scientific paper

• Author: Ilja Doršner
• Author: Emina Džaferović-Mašić
• 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 present a phenomenological study of the most minimal realistic SU(5) model that owns its predictivity solely to the gauge symmetry and the representational content. The model is built entirely out of the fields residing in the first five lowest dimensional representations that transform nontrivially under the SU(5) gauge group. It has 18 real parameters and 14 phases, all in all, to address experimental observables of the Standard Model fermions and accomplishes that via simultaneous use of three different mass generation mechanisms. Furthermore, it inextricably links the origin of the neutrino mass to the experimentally observed difference between the down-type quark and charged lepton masses. The main predictions of the model are that (i) the neutrinos are Majorana particles, (ii) one neutrino is massless, (iii) the neutrinos have normal mass ordering, and (iv) there are four new scalar multiplets at or below a 120 TeV mass scale. A one-loop analysis demonstrates that an improvement of the current p→π0e+ partial lifetime limit by a factor of 2, 15, and 96 would require these four scalar multiplets to reside at or below the 100, 10, and 1 TeV mass scales, respectively.

• Keywords (english): grand unified theory; proton decay; fermion masses
• 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. 104, no. 1, 015023
• p-ISSN: 2470-0010
• e-ISSN: 2470-0029
• DOI: https://doi.org/10.1103/PhysRevD.104.015023
• URN:NBN: urn:nbn:hr:217:177030
• Publication: 2021
• Document URL: https://link.aps.org/doi/10.1103/PhysRevD.104.015023
• 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 11 May 2021; Accepted 22 June 2021; Published 15 July 2021.
• Created on: 2023-08-11 10:40:30