1201.3293 (ATLAS Collaboration)

Search for excited leptons in proton-proton collisions at sqrt(s) = 7
TeV with the ATLAS detector    [PDF]

ATLAS Collaboration

The ATLAS detector is used to search for excited leptons in the electromagnetic radiative decay channel l* --> l+gamma. Results are presented based on the analysis of pp collisions at a center-of-mass energy of 7 TeV corresponding to an integrated luminosity of 2.05/fb. No evidence for excited leptons is found, and limits are set on the compositeness scale Lambda as a function of the excited lepton mass m_l*. In the special case where Lambda = m_l*, excited electron and muon masses below 1.87 TeV and 1.75 TeV are excluded at 95% C.L., respectively.

View original: http://arxiv.org/abs/1201.3293