顶夸克宽度的测定
高能物理 - 实验
2016-08-14 v1
摘要
我们利用D0合作组在Tevatron质子-反质子对撞机上收集的、积分亮度高达2.3 fb^-1的数据，通过单顶夸克产生的t道截面测量了部分衰变宽度Gamma(t -> W b)，并通过ttbar事件测量了分支比B(t -> W b)，从而提取出顶夸克的总宽度Gamma_t。结果为Gamma_t = 1.99 +0.69 -0.55 GeV，对应的顶夸克寿命为tau_t = (3.3 +1.3 -0.9) x 10^-25秒。假设存在高质量的第四代b'夸克以及四代夸克混合矩阵的幺正性，我们在95%置信水平上设定了|Vtb'| < 0.63的首个上限。
引用
@article{arxiv.1009.5686,
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journal= {arXiv preprint arXiv:1009.5686},
year = {2016}
}
备注
submitted to Phys. Rev. Letters