2001/09/30 by ZEUS Collaboration, S. Chekanov, M. Derrick +97 · 37 citations
Physics and Astronomy · #Astrophysics #Deep inelastic scattering #Electron #Excited state #Fermion #HERA #High-Energy Particle Collisions Research #Inelastic scattering #Luminosity #Neutrino #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quark #Scattering #ZEUS (particle detector) #hep-ex
paper · pdf · open access · doi:10.1016/s0370-2693(02)02863-0
published in Physics Letters B 549(1-2), 32-47 (Elsevier BV) · 18 pages, 5 figures, Submitted to PLB. Revised analysis takes excited fermion natural width into account
arxiv created 2002/10/24 · openalex publication_date 2002/11/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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∗→eγ, e∗→eZ and e∗→νW. Excited quarks have been sought via the decays q∗→qγ and q∗→qW. A search for excited neutrinos decaying via ν∗→νγ, ν∗→νZ and ν∗→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 ≲250 GeV.