, Volume 50, Issue 3, pp 507-518
Date: 29 Mar 2007

Search for a fourth generation b’-quark at LEP-II at \(\sqrt{s}=\,\) 196–209 GeV

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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 \(R_{\text{CKM}}=|\frac{V_{cb\prime}}{V_{\text{tb}\prime}V_{tb}}|\) , where Vcb′, Vtb′ and Vtb are elements of the extended CKM matrix.