论文标题
与顶级夸克相关的重玻色子的生产和腐烂
Production and decay of a heavy boson in association with top quarks
论文作者
论文摘要
我们将NLO QCD校正简要介绍给$ pp \ to t \ bar {t} b +x $ process，其中$ b $代表$ h，\，w^\ pm $或$ z $。在计算中，所有双重，单一和非共鸣的Feynman图，包括顶部夸克和$ W^\ pm/z $量表玻色子的干扰和有限宽度效果。数值结果显示在差分横截面级别，用于各种分解和重态化量表设置以及一些PDF集。还讨论了与扰动膨胀和PDF参数不同的高阶术语相关的主要理论不确定性。此外，我们将$ pp \ \ bar {t} b+x $在多勒普顿最终状态中的t \ bar {t} b+x $与窄宽度近似中的计算进行比较。
We briefly report on NLO QCD corrections to the $pp \to t\bar{t} B +X$ process, where $B$ stands for $H,\,W^\pm$ or $Z$. In the calculation all double-, single and non-resonant Feynman diagrams, interferences and finite-width effects are included for the top quark and $W^\pm/Z$ gauge bosons. Numerical results are shown at the differential cross section level for various factorisation and renormalisation scale settings and a few PDF sets. The main theoretical uncertainties associated with neglected higher-order terms in the perturbative expansion and with different parametrisations of the PDFs are also discussed. Furthermore, we compare our complete predictions for $pp\to t\bar{t} B+X$ in multi-lepton final states to the calculation in the narrow-width approximation.
