If quarks are composite particles then excited states are expected. We have searched in ppBAR collisions for excited quarks (q*) which decay to common quarks by emitting a W boson (q* --> qW) or a photon (q* --> qgamma). The simplest model of excited quarks has been excluded for mass M* < 540 GeV/c2 at 95% confidence level.
Search For Excited Quarks In P(p)over-bar Collisions At Root-s=1.8tev
BISELLO, DARIO;BUSETTO, GIOVANNI;LUCCHESI, DONATELLA;MARIOTTI, MOSE';
1994
Abstract
If quarks are composite particles then excited states are expected. We have searched in ppBAR collisions for excited quarks (q*) which decay to common quarks by emitting a W boson (q* --> qW) or a photon (q* --> qgamma). The simplest model of excited quarks has been excluded for mass M* < 540 GeV/c2 at 95% confidence level.
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