Grand Unification Signal from Ultra High Energy Cosmic Rays?

Abstract

The spectrum of ultrahigh energy (above \approx 10^{9} GeV) cosmic rays is consistent with the decay of GUT scale particles. The predicted mass is m_X=10^b GeV, where b=14.6_{-1.7}^{+1.6}.

Comments: 4 pages, 3 figures one figure removed, one table added, conclusions essentially remained the same within errorbars