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I discuss an upper bound on the boost and the energy of elementary particles.The limit is derived utilizing the core principle of relativistic quantummechanics stating that there is a lower bound for localization of an elementaryquantum system and the assumption that when the localization scale reaches thePlanck length, elementary particles are removed from the S-matrix observables.The limits for the boost and energy, M_{Planck}/m andM_{Planck}c^{2}\approx\,8.6 * 10^{27} eV, are defined in terms of fundamentalconstants and the mass of elementary particle and does not involve any dynamicscale. These bounds imply that the cosmic ray flux of any flavor may stretch upto energies of order 10^{18} GeV and will cut off around this value.

Maximal boost and energy of elementary particles as a manifestation of the limit of localizability of elementary quantum systems