Search for excited leptons at 130–140 GeV

D. Buskulic, I. De Bonis, D. Decamp, P. Ghez, C. Goy, J.-P. Lees, A. Lucotte, M.-N. Minard, J.-Y. Nief, P. Odier, B. Pietrzyk, M.P. Casado (+382 others)
1996 Physics Letters B  
A search for the radiative decay of excited charged leptons, ', and for radiative and weak decays of excited electron neutrinos, e , is performed, using the 5.8 pb 1 of data collected by ALEPH at 130 140 GeV. No evidence for a signal is found in single or pair production. Excluded mass limits from pair production are close to 65 GeV=c 2 for all excited lepton species. Limits on the couplings, =m ' , of excited leptons are derived from single production. For an excited lepton mass of 130 GeV=c 2
more » ... , these limits are 0.04 GeV 1 for and , and 0.0007 GeV 1 for e . For e , the limit is at the level of 0.03 GeV 1 for a mass of 120 GeV=c 2 , independent of the decay branching ratios.
doi:10.1016/0370-2693(96)00961-6 fatcat:yueckawzvjfvdcrd2oug6iviby