2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/106837In this paper the results of AGASA experiment is discussed. It is argued that the UHECR radiation is composed of long lived particles with mass, where is the proton mass. Keywords: UHECR; Modified Lorentz transformation; New particles. PACS: 96.50.S, 96.50sb, 13.85Tp10 pages,4 figuresAstrophysicstext