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A search for the pair production of fourth generation b'-quarks was performedusing data taken by the DELPHI detector at LEP-II. The analysed data werecollected at centre-of-mass energies ranging from 196 to 209 GeV, correspondingto 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' massesranging from 96 to 103 GeV/c^2. These limits, together with the theoreticalbranching ratios predicted by a sequential four generations model, were used toconstrain 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.

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