Search for a fourth generation b'-quark at LEP-II at sqrt{s}=196-209 GeV

Details Search for a fourth generation b'-quark at LEP-II at sqrt{s}=196-209 GeV Search for a fourth generation b'-quark at LEP-II at sqrt{s}=196-209 GeV

2007-04-04

arxiv.org/abs/0704.0594v1

Eur.Phys.J.C50:507-518,2007

Physics

High Energy Physics

High Energy Physics - Experiment

26 pages, 12 figures, Accepted by Eur. Phys. J. C

Scientific paper

10.1140/epjc/s10052-007-0273-z

A search for the pair production of fourth generation b'-quarks was performed using data taken by the DELPHI detector at LEP-II. The analysed data were collected at centre-of-mass energies ranging from 196 to 209 GeV, corresponding to an integrated luminosity of 420 pb^{-1}. No evidence for a signal was found. Upper limits on BR(b' -> bZ) and BR(b' -> cW) were obtained for b' masses ranging from 96 to 103 GeV/c^2. These limits, together with the theoretical branching ratios predicted by a sequential four generations model, were used to constrain the value of R_{CKM}=|V_{cb'}/V_{tb'}V_{tb}|, where V_{cb'}, V_{tb'} and V_{tb} are elements of the extended CKM matrix.

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