Phenomenological interpretation of the multi-muon events reported by the   CDF collaboration
  We present a phenomenological conjecture of new physics that is suggested by the topology and kinematic properties of the multi-muon events recently reported by the CDF collaboration. We show that the salient features of the data can be accounted for by postulating the pair production of three new states h1, h2, and h3 with masses in the range of 15, 7.3 and 3.6 GeV/c^2, respectively. The heavier states cascade-decay into the lighter ones, whereas the lightest state decays into a tau pair with a lifetime of the order of 20 ps. 
P. Giromini, F. Happacher, M. J. Kim, M. Kruse, K. Pitts, F. Ptohos,   and S. Torre