Tuesday, April 9, 2013

Return of the dark lepton jets

A year ago I made a silly post, "Dark matter and powers of two", proposing a connection between Weniger's gamma-ray line, and the alleged "lepton jets" that had caused a brief blog-scandal (when Tommaso Dorigo opined that a theory paper by Arkani-Hamed and Weiner must have been written with advance knowledge of the lepton-jet claim; Tommaso later retracted his allegation).

Today I see two papers talking about multi-tau states in connection with the AMS-02 confirmation of an excess positron fraction at high energies, that might be due to dark matter annihilation: Cholis and Hooper, and Jin, Wu and Zhou... I suppose the serious physics issue is this: it would be interesting if the lepton jets were real, and if they had a role in producing the positron excess; and conversely, it would be interesting if the intermediate states producing the lepton jets (assuming them to be real!) were dark-matter states.