20.500.12556/RUL-155975 Gauge and scalar boson mediated proton decay in a predictive SU(5) GUT model 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. physics of elementary particles fizika osnovnih delcev true false true Angleški jezik Slovenski jezik Članek v reviji 2024-04-25 11:33:55 2024-04-25 11:33:56 2024-04-26 04:07:09 0000-00-00 00:00:00 2024 0 0 Str. 075023-1-075023-19 iss. 7 Vol. 109 2024 0000-00-00 Zaloznikova NiDoloceno NiDoloceno 0000-00-00 0000-00-00 2024-04-12 539.1 2470-0010 10.1103/PhysRevD.109.075023 193887491 PhysRevD.109.075023.pdf PhysRevD.109.075023.pdf 1 DFBEA22DDE425EC882C11AF77042BB84 65fd068327da631238c551cf11f61ae5db266150da8d4258dcf7dc4f05c43833 07c39e0d-02e7-11ef-a27e-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=183163 https://journals.aps.org/prd/abstract/10.1103/PhysRevD.109.075023 0 12c404bc-02e7-11ef-a27e-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=183164 Fakulteta za matematiko in fiziko 0 0 0