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arXiv 1503.05027hep-ex
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单顶夸克截面的Tevatron组合和Cabibbo-Kobayashi-Maskawa矩阵元$\bf V_{tb}$的大小确定

Tevatron Combination of Single-Top-Quark Cross Sections and Determination of the Magnitude of the Cabibbo-Kobayashi-Maskawa Matrix Element $\bf V_{tb}$

CDF Collaboration, D0 Collaboration

备注：
11 pages, 4 figures
发表信息：
Phys. Rev. Lett. 115, 152003 (2015)
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摘要：

我们给出了质心能量为1.96 TeV的质子-反质子碰撞中单顶夸克产生的截面的CDF和D 0测量的最终组合。数据对应于每次实验高达9.7 fb $^{-1}$的总积分光度。测量$t$通道横截面为$σ_t = 2.25^{+0.29}_{-0.31}$ pb.我们还提出了$s$与$t$通道截面的二维测量和$s+t$通道截面测量的组合，得到$σ_{s+t} = 3.30^{+0.52}_{-0.40}$ pb，而不假设比率$σ_s/σ_t$的标准模型值。由此得到的顶底夸克耦合的大小为$|V_{tb}|$ = $1.02^{+0.06}_{-0.05}$，对应于95% C. L.时的$|V_{tb}| > 0.92$。

英文摘要：

We present the final combination of CDF and D0 measurements of cross sections for single-top-quark production in proton-antiproton collisions at a center-of-mass energy of 1.96 TeV. The data correspond to total integrated luminosities of up to 9.7 fb$^{-1}$ per experiment. The $t$-channel cross section is measured to be $σ_t = 2.25^{+0.29}_{-0.31}$ pb. We also present the combinations of the two-dimensional measurements of the $s$- vs. $t$-channel cross sections and of the $s+t$ channel cross section measurement resulting in $σ_{s+t} = 3.30^{+0.52}_{-0.40}$ pb, without assuming the standard-model value for the ratio $σ_s/σ_t$. The resulting value of the magnitude of the top-to-bottom quark coupling is $|V_{tb}|$ = $1.02^{+0.06}_{-0.05}$, corresponding to $|V_{tb}| > 0.92$ at the 95% C.L.

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