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Title
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Search for a fourth generation -quark at LEP-II at = 196-209 GeV
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Author
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Institution/Organisation
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DELPHI Collaboration
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Abstract
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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. |
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Language
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English
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Source (journal)
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European physical journal : C : particles and fields. - Berlin
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Publication
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Berlin
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2007
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ISSN
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1434-6044
1434-6052
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Volume/pages
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50
:3
(2007)
, p. 507-518
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ISI
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000245853100001
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Full text (Publisher's DOI)
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