A Search for excited fermions in electron - proton collisions at HERA

A search for excited states of the standard model fermions was performed using the ZEUS detector at the HERA electron-proton collider, operating at a centre of mass energy of 296 GeV. In a sample corresponding to an integrated luminosity of 0.55 pb−1, no evidence was found for any resonant state decaying into final states composed of a fermion and a gauge boson. Limits on the coupling strength times branching ratio of excited fermions are presented for masses between 50 GeV and 250 GeV, extending previous search regions significantly.

electron p: colliding beams
colliding beams: electron p
model: composite
fermion: excited state
search for: excited state
decay: excited state
excited state: decay
mass spectrum: (gauge boson fermion)
(gauge boson fermion): mass spectrum
production: upper limit

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