Search for a fourth generation charge -1/3 quark via flavor changing neutral current decayстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We report on a search for pair production of a fourth generation charge -1/3 quark (b') in p (n) over bar collisions at root s = 1.8 TeV by the DO experiment at the Fermilab Tevatron using an integrated luminosity of 93 pb(-1). Both b' quarks are assumed to decay via flavor changing neutral currents (FCNC). The search uses the signatures gamma + 3 jets mu-tag and 2 gamma + 2 jets. We see no significant excess of events over the expected background. We place an upper limit on the production cross section times branching fraction that is well below theoretical expectations for a bl decaying exclusively via FCNC for b' masses up to m(Z) + m(b).