Electroweak jet cascading in the decay of superheavy particles

Details Electroweak jet cascading in the decay of superheavy particles Electroweak jet cascading in the decay of superheavy particles

2002-05-20

arxiv.org/abs/hep-ph/0205218v1

Phys.Rev.Lett. 89 (2002) 171802

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 1 eps figure

Scientific paper

10.1103/PhysRevLett.89.171802

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 $\gamma$-ray flux.

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