通过$tcg$和$tug$变味中性电流耦合寻找单顶夸克的产生
Search for production of single top quarks via $tcg$ and $tug$ flavor-changing neutral current couplings
摘要：
我们通过一个胶子与顶夸克和一个粲夸克（$c$）或上夸克（$u$）的变味中性流耦合来寻找单个顶夸克的产生。我们分析了费米实验室Tevatron对撞机D0探测器收集的230 pb的质量中心能量为1.96 TeV的$^{-1}$碰撞轻子+喷流数据。我们没有观察到与标准模型预测的显著偏差，因此对反常耦合参数$\kappacLambda$和$\kappauLambda$设置了上限，其中$\kappag$定义了$tcg$和$tug$耦合的强度，而$Λ$定义了新物理的规模。95% C.L.的限度是：$\kappacLambda < 0.15 \rm TeV^{-1}$和$\kappauLambda < 0.037 \rm TeV^{-1}$。
英文摘要：
We search for the production of single top quarks via flavor-changing neutral current couplings of a gluon to the top quark and a charm ($c$) or up ($u$) quark. We analyze 230 pb$^{-1}$ of lepton + jets data from $\ppbar$ collisions at a center of mass energy of 1.96 TeV collected by the D0 detector at the Fermilab Tevatron Collider. We observe no significant deviation from standard model predictions, and hence set upper limits on the anomalous coupling parameters $\kappacLambda$ and $\kappauLambda$, where $\kappag$ define the strength of $tcg$ and $tug$ couplings, and $Λ$ defines the scale of new physics. The limits at 95% C.L. are: $\kappacLambda < 0.15 \rm TeV^{-1}$ and $\kappauLambda < 0.037 \rm TeV^{-1}$.
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。
