EXCITED FERMIONS AT HERA

摘要

Heavy excited states of fermions have been searched for in e~+p collisions at a center-of-mass energy of 300 GeV with the ZEUS and H1 detectors at HERA using an integrated luminosity of 38 pb~(-1). Excited neutrinos have been searched for in e~-p collisions at a center-of-mass energy of 318 GeV using an integrated luminosity of 16 pb~(-1). No signal was observed and constraints on such states were set, which complement or extend beyond those obtained at other colliders.