|
Title
|
|
|
|
Search for a fourth generation -quark at LEP-II at = 196-209 GeV
|
|
|
Author
|
|
|
|
|
|
|
Institution/Organisation
|
|
|
|
DELPHI Collaboration
|
|
|
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. |
|
|
|
Language
|
|
|
|
English
|
|
|
Source (journal)
|
|
|
|
European physical journal : C : particles and fields. - Berlin
|
|
|
Publication
|
|
|
|
Berlin
:
2007
|
|
|
ISSN
|
|
|
|
1434-6044
1434-6052
|
|
|
DOI
|
|
|
|
10.1140/EPJC/S10052-007-0273-Z
|
|
|
Volume/pages
|
|
|
|
50
:3
(2007)
, p. 507-518
|
|
|
ISI
|
|
|
|
000245853100001
|
|
|
Full text (Publisher's DOI)
|
|
|
|
|
|