000171663 001__ 171663
000171663 005__ 20260527123127.0
000171663 0247_ $$2doi$$a10.1088/1475-7516/2026/03/023
000171663 0248_ $$2sideral$$a149414
000171663 037__ $$aART-2026-149414
000171663 041__ $$aeng
000171663 100__ $$0(orcid)0000-0003-4196-5856$$aCarmona, J.M.
000171663 245__ $$aSuperluminal constraints from ultra-high-energy neutrino events
000171663 260__ $$c2026
000171663 5203_ $$aThe 220+570-100 PeV neutrino detected by KM3NeT marks the beginning of ultrahigh-energy neutrino astronomy and provides a powerful probe of Lorentz Invariance Violation (LIV). In superluminal scenarios, neutrinos can decay through vacuum e-e+ pair emission or neutrino splitting. Previous analyses of the KM3-230213A event relied on simplified survival-probability estimates and, in some cases, used inaccurate decay-width expressions or neglected redshift and threshold effects. In this work we present a unified and self-consistent framework that corrects these issues and applies to both the energy-independent (n = 0) and quadratic (n = 2) superluminal cases. We collect and recast the decay-width and threshold expressions, clarify their flavor dependence, and include a consistent treatment of cosmological propagation. We also assess the impact of cascade regeneration and show that cascade effects are negligible for the purpose of setting LIV bounds. The survival-probability approximation adopted in previous works is therefore justified, while our framework provides a coherent basis for future analyses of superluminal neutrino constraints, which should consistently include possible time-delay signatures.
000171663 536__ $$9info:eu-repo/grantAgreement/ES/DGA/E21-23R$$9info:eu-repo/grantAgreement/ES/MICINN/PGC2022-126078NB-C21$$9info:eu-repo/grantAgreement/ES/MICINN/PID2024-160228NB-I00
000171663 540__ $$9info:eu-repo/semantics/closedAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000171663 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000171663 700__ $$0(orcid)0000-0002-8282-3435$$aCortés, J.L.$$uUniversidad de Zaragoza
000171663 700__ $$0(orcid)0000-0003-1357-4815$$aReyes, M.A.$$uUniversidad de Zaragoza
000171663 7102_ $$12004$$2405$$aUniversidad de Zaragoza$$bDpto. Física Teórica$$cÁrea Física Teórica
000171663 773__ $$g2026, 03 (2026), 023$$pJ. Cosmol. Astropart. Phys.$$tJournal of Cosmology and Astroparticle Physics$$x1475-7516
000171663 8564_ $$s742938$$uhttps://zaguan.unizar.es/record/171663/files/texto_completo.pdf$$yVersión publicada
000171663 8564_ $$s2829844$$uhttps://zaguan.unizar.es/record/171663/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000171663 909CO $$ooai:zaguan.unizar.es:171663$$particulos$$pdriver
000171663 951__ $$a2026-05-27-11:26:03
000171663 980__ $$aARTICLE