Title Search for a fourth generation $b\prime$-quark at LEP-II at $\sqrt{s}$= 196-209 GeV Author Abdallah, J. Van Remortel, N. et al. Faculty/Department Faculty of Sciences. Physics Publication type article Publication 2007 Berlin , 2007 Subject Physics Source (journal) European physical journal : C : particles and fields. - Berlin Volume/pages 50(2007) :3 , p. 507-518 ISSN 1434-6044 ISI 000245853100001 Carrier E Target language English (eng) Full text (Publishers DOI) 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 $R_{\text{CKM}}=|\frac{V_{cb\prime}}{V_{\text{tb}\prime}V_{tb}}|$, where Vcb′, Vtb′ and Vtb are elements of the extended CKM matrix. E-info http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000245853100001&DestLinkType=RelatedRecords&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000245853100001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000245853100001&DestLinkType=CitingArticles&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848