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Search for a fourth generation b-prime-quark at LEP-II at s**(1/2) = 196-GeV - 209-GeV.

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<mark>Journal publication date</mark>04/2007
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number3
Volume50
Number of pages12
Pages (from-to)507-518
Publication statusPublished
Original languageEnglish

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 , where Vcb′, Vtb′ and Vtb are elements of the extended CKM matrix.