Search for excited quarks in pp¯ collisions at √s =1.8 TeV
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If quarks are composite particles then excited states are expected. We have searched in pp» collisions for excited quarks (q*) which decay to common quarks by emitting a W boson (q*qW) or a photon (q*q). The simplest model of excited quarks has been excluded for mass M*<540 GeV/c2 at 95% confidence level. © 1994 The American Physical Society.
author list (cited authors)
Abe, F., Albrow, M., Amidei, D., Anway-Wiese, C., Apollinari, G., Areti, H., ... Zucchelli, S.