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Search for a fourth generation charge -1/3 quark via flavor changing neutral current decay

The D0 collaboration Abachi, S. ; Abbott, B. ; Abolins, M. ; et al.

Phys.Rev.Lett. 78 (1997) 3818-3823, 1997.

Inspire Record 426498 DOI 10.17182/hepdata.42251

We report on a search for pair production of a fourth generation charge -1/3 quark (b') in pbar p collisions at sqrt(s) = 1.8 TeV at the Fermilab Tevatron using an integrated luminosity of 93 pb^-1. Both 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 b' quark decaying exclusively via FCNC for b' quark masses up to m(Z) + m(b).

3 data tables match query

Table 1

Cross section times branching fraction for the gamma+3jets channel.

Table 2

Cross section times branching fraction for the 2gamma+2jets channel.

Table 3

No description provided.