Search for excited quarks in pp-bar collisions at sqrt s =1.8 TeV.
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abstract
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.