Abdallah, J. and Sopczak, Andre and The DELPHI Collaboration, et al. (2007) Search for a fourth generation b-prime-quark at LEP-II at s**(1/2) = 196-GeV - 209-GeV. European Physical Journal C: Particles and Fields, 50 (3). pp. 507-518. ISSN 1434-6044
Full text not available from this repository.Abstract
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 , where Vcb′, Vtb′ and Vtb are elements of the extended CKM matrix.