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arXiv 0704.0594hep-ex
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在LEP-II寻找第四代b '-夸克在sqrt{s}=196-209 GeV

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

The DELPHI Collaboration, J. Abdallah

备注：
26 pages, 12 figures, Accepted by Eur. Phys. J. C
发表信息：
Eur.Phys.J.C50:507-518,2007
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摘要：

利用LEP-II的DELPHI探测器获得的数据对第四代b ′-夸克的对产生进行了研究。分析的数据是在质心能量从196到209 GeV的范围内收集的，对应的积分亮度为420 pb^{-1}。在b'质量为96 ~ 103 GeV/c^2的范围内，得到了BR（b' -> bZ）和BR（b' -> cW）的上限。这些限值与连续四代模型预测的理论分支比一起用于约束R_{CKM}的值=| V_{cb'} / V_{tb'} V_{tb}|其中V_{cb'}、V_{tb'}和V_{tb}是扩展CKM矩阵的元素。

英文摘要：

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_{CKM}=|V_{cb'}/V_{tb'}V_{tb}|, where V_{cb'}, V_{tb'} and V_{tb} are elements of the extended CKM matrix.

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