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Open Access item Search for a fourth generation b'-quark at LEP-II at sqrt{s}=196-209 GeV

Authors:Gómez-Ceballos, Guillelmo
Cuevas, Javier
Keywords:Physics Event Generation, Neutral-current Decays, Charge -1/3 Quark, Monte-carlo, E(+)e(-) Colliders, Delphi, Energy, Z0, Annihilation, Collisions
Issue Date:29-Mar-2007
Publisher:Società Italiana di Fisica
Springer
Citation:European Physical Journal C 50: 507-518 (2007)
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'-> bZ) were obtained for b' masses ranging from 96 to 103 GeV/c^2 stop. These limits, together with the theoretical branching ratios predicted by a sequential four generations model, were used to constrain the value of R_CKM=vertical bar V_cb' / V_tb' V_tb vertical bar, where V_cb', V_tb' and V_tb are elements of the extended CKM matrix.
Description:12 pages, 12 figures.-- ISI Article Identifier: 000245853100001.-- El Pdf del artículo es la versión pre-print: http://arxiv.org/pdf/0704.0594.-- DELPHI Collaboration: et al.
Publisher version (URL):http://dx.doi.org/10.1140/epjc/s10052-007-0273-z
URI:http://hdl.handle.net/10261/8536
ISSN:1434-6044 (Print)
1434-6052 (Online)
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