出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present two searches for new phenomena in events whose final states are similar to those where top quarks are produced, either in pairs or singly, and decay according to the Standard Model. Both searches are conducted by the D0 collaboration using p ¯ p collisions at ps = 1.96 TeV at Fermilab’s Tevatron collider. The first is a search for pair-production of a fourth generation t0 quark that decays to a W boson and a down-type quark, while the second is a search for a W0 gauge boson that decays to t¯b. In the absence of any compelling evidence of signal, we set new upper limits on the production cross sections and translate those into limits on the mass of the fourth generation quark, and the mass of theW0 boson, respectively, in a variety of models.
