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Electroweak jet cascading in the decay of superheavy particles

V. Berezinsky·M. Kachelriess·S. Ostapchenko
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Abstract

We study decays of superheavy particles $X$ into leptons. We show that they initiate cascades similar to QCD parton jets, if $m_X\gsim 10^6$ GeV. Electroweak cascading is studied and the energy spectra of the produced leptons are calculated in the framework of a broken SU(2) model of weak interactions. As application, important for the Z-burst model for ultrahigh energy cosmic rays, we consider decays of superheavy particles coupled on tree-level only to neutrinos and derive stringent limit for these decays from the observed diffuse extragalactic $γ$-ray flux.

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V. Berezinsky, M. Kachelriess, S. Ostapchenko. 2002-05-20. Electroweak jet cascading in the decay of superheavy particles. https://doi.org/10.1103/physrevlett.89.171802

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