Searches for excited fermions in ep collisions at HERA

Details Searches for excited fermions in ep collisions at HERA Searches for excited fermions in ep collisions at HERA

2001-09-14

arxiv.org/abs/hep-ex/0109018v2

Phys.Lett.B549:32-47,2002

Physics

High Energy Physics

High Energy Physics - Experiment

18 pages, 5 figures, Submitted to PLB. Revised analysis takes excited fermion natural width into account

Scientific paper

10.1016/S0370-2693(02)02863-0

Searches in ep collisions for heavy excited fermions have been performed with the ZEUS detector at HERA. Excited states of electrons and quarks have been searched for in e^+p collisions at a centre-of-mass energy of 300 GeV using an integrated luminosity of 47.7 pb^-1. Excited electrons have been sought via the decays e*->egamma, e*->eZ and e*->nuW. Excited quarks have been sought via the decays q*->qgamma and q*->qW. A search for excited neutrinos decaying via nu*->nugamma, nu*->nuZ and nu*->eW is presented using e^-p collisions at 318 GeV centre-of-mass energy, corresponding to an integrated luminosity of 16.7 pb^-1. No evidence for any excited fermion is found, and limits on the characteristic couplings are derived for masses below 250 GeV.

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