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Search for a fourth generation b '-quark at LEP-II at root s=196-209GeV
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2007 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 50, no 3, p. 507-518Article in journal (Refereed) Published
Abstract [en]

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 there V-cb', V-tb' and V-tb are elements of the extended CKM matrix.

Place, publisher, year, edition, pages
2007. Vol. 50, no 3, p. 507-518
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Physical Sciences
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URN: urn:nbn:se:uu:diva-144949DOI: 10.1140/epjc/s10052-007-0273-zISI: 000245853100001OAI: oai:DiVA.org:uu-144949DiVA, id: diva2:395099
Available from: 2011-02-04 Created: 2011-02-04 Last updated: 2017-12-11Bibliographically approved

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