Title
Search for a fourth generation <tex>$b\prime$</tex>-quark at LEP-II at <tex>$\sqrt{s}$</tex>= 196-209 GeV
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Berlin ,
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
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