论文标题
在LHC上访问CKM抑制的顶级衰减
Accessing CKM suppressed top decays at the LHC
论文作者
论文摘要
我们提出了现有的实验策略的扩展，以测量顶级夸克腐烂的分支分数，该策略特别针对$ t \ to j_q w $，其中$ j_q $是轻质夸克喷气机。改进的策略使用正交$ b $ - 和$ q $ - taggers，并在已经常用的可观察到的可观察到的新的可观察到的亮点标签喷气器数量中增加了$ b $ tage的射流的一部分。仔细包含其他互补的可观察到的可显着增加分析的预期统计能力，并有可能排除$ | v_ {tb} | = 1 $ = 1 $ $ 95 \％$ c.l.在HL-LHC上，直接访问$ | v_ {td} |^2+| v_ {ts} |^2 $的标准模型值。
We propose an extension of the existing experimental strategy for measuring branching fractions of top quark decays, targeting specifically $t\to j_q W$, where $j_q$ is a light quark jet. The improved strategy uses orthogonal $b$- and $q$-taggers, and adds a new observable, the number of light-quark-tagged jets, to the already commonly used observable, the fraction of $b$-tagged jets in an event. Careful inclusion of the additional complementary observable significantly increases the expected statistical power of the analysis, with the possibility of excluding $|V_{tb}|=1$ at $95\%$ C.L. at the HL-LHC, and accessing directly the standard model value of $|V_{td}|^2+|V_{ts}|^2$.
