Beyond neutrino mass: observable $n$-$\bar{n}$ oscillations in UV complete seesaw models

Doršner, Ilja (avtor), Fajfer, Svjetlana (avtor), Saad, Shaikh (avtor)

Next-generation experiments, such as the Deep Underground Neutrino Experiment and the European Spallation Source, are set to improve sensitivity to neutron-antineutron oscillation, a direct probe of ∆B = 2 baryon number violation, with particularly significant gains expected at the latter. The discovery of such a rare ∆B = 2 process would indicate physics beyond the Standard Model and could point to specific unified theories that allow observable ▫$n$▫-▫$\bar{n}$▫ transitions. We accordingly examine ▫$n$▫-▫$\bar{n}$▫ oscillations within a unified framework that accounts for charged fermion masses and generates viable neutrino masses via the seesaw mechanism. More specifically, we show that ▫$n$▫-▫$\bar{n}$▫ oscillations can arise from two specific topologies within two distinct SU(5) scenarios. One topology requires a presence of two color-sextet scalars in the Type II seesaw framework, whereas the other involves a scalar sextet and a color-octet fermion in the Type III seesaw framework. While the former topology can be realized in the SO(10)/Pati-Salam frameworks, the latter finds a natural embedding in SU(5), which constitutes one of the key novelties of our work. Remarkably enough, the same dynamics responsible for fermion masses also induces baryon number violation, thus linking ▫$n$▫-▫$\bar{n}$▫ oscillations to the flavor structure of the theory. We show that, given a TeV-scale mass for one of the colored states, upcoming searches for such ∆B = 2 processes can probe for a presence of the other colored states with masses up to 1011 GeV, well beyond the reach of colliders. This positions ▫$n$▫-▫$\bar{n}$▫ oscillations as a rare low-energy portal to grand unification and ultra-heavy new physics.

• Jezik: Angleški jezik
• Ključne besede: physics of elementary particles
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FMF - Fakulteta za matematiko in fiziko
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2025
• Št. strani: 26 str.
• Številčenje: Vol. 2025, art. no. 24
• PID: 20.500.12556/RUL-175882
• UDK: 539.1
• ISSN pri članku: 1029-8479
• DOI: 10.1007/JHEP11(2025)024
• COBISS.SI-ID: 256728579
• Datum objave v RUL: 12.11.2025

Gradivo je del revije

• Naslov: The journal of high energy physics
• Skrajšan naslov: J. high energy phys.
• Založnik: SISSA
• ISSN: 1029-8479
• COBISS.SI-ID: 1314148

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: fizika osnovnih delcev

Projekti

• Financer: ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
• Številka projekta: P1-0035-2019
• Naslov: Teorija jedra, osnovnih delcev in polj

• Financer: ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
• Številka projekta: N1-0321-2023
• Naslov: Obarvani skalari v fiziki onkraj standardnega modela