arXiv 1108.30912011-08-15hep-ex

TeV =1.96时ppbar碰撞中单顶夸克产生截面和|Vtb|的测量

Measurements of single top quark production cross sections and |Vtb| in ppbar collisions at sqrt{s}=1.96 TeV

D0 Collaboration

备注：: 11 pages, 8 figures, submitted to Phys. Rev. D
DOI：: 10.1103/PhysRevD.84.112001

摘要：

我们测量了在费米实验室Tevatron对撞机上用D 0探测器收集的$5.4\;\rm fb^{-1}$积分光度对应的数据样本中，在$\sqrt{s}=1.96\;\rm TeV$的$\ppbar$碰撞中产生单顶夸克的截面.我们选择事件与孤立的电子或μ子，横向能量的不平衡，和两个，三个，或四个喷流，其中一个或两个包含底部强子。我们得到了$σ({\ppbar}{\rargap}tb+X, tqb+X) = 3.43\pm^{0.73}_{0.74}\;\rm pb$的包含截面，并利用它在95% C. L.处提取了CKM矩阵元$0.79 < |V_{tb}| \leq 1$.我们还测量$σ({\ppbar}{\rargap}tb+X) = 0.68\pm^{0.38}_{0.35}\;\rm pb$和$σ({\ppbar}{\rargap}tqb+X) = 2.86\pm^{0.69}_{0.63}\;\rm pb$时，分别假设，$tqb$和$tb$生产率预测的标准模型。

英文摘要：

We present measurements of production cross sections of single top quarks in $\ppbar$ collisions at $\sqrt{s}=1.96\;\rm TeV$ in a data sample corresponding to an integrated luminosity of $5.4\;\rm fb^{-1}$ collected by the D0 detector at the Fermilab Tevatron Collider. We select events with an isolated electron or muon, an imbalance in transverse energy, and two, three, or four jets, with one or two of them containing a bottom hadron. We obtain an inclusive cross section of $σ({\ppbar}{\rargap}tb+X, tqb+X) = 3.43\pm^{0.73}_{0.74}\;\rm pb$ and use it to extract the CKM matrix element $0.79 < |V_{tb}| \leq 1$ at the 95% C.L. We also measure $σ({\ppbar}{\rargap}tb+X) = 0.68\pm^{0.38}_{0.35}\;\rm pb$ and $σ({\ppbar}{\rargap}tqb+X) = 2.86\pm^{0.69}_{0.63}\;\rm pb$ when assuming, respectively, $tqb$ and $tb$ production rates as predicted by the standard model.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

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