论文标题
NLO QCD校正要拆下$ \ text {t} \ bar {\ text {t}} \ text {w}^+$生产在lhc
NLO QCD corrections to off-shell $\text{t}\bar{\text{t}}\text{W}^+$ production at the LHC
论文作者
论文摘要
我们将NLO QCD校正的计算结果介绍给了脱壳顶部的生产 - proton-- proton碰撞中的off-shell $ \ text {w}^+$ boson结合的Antitop对。因为计算基于该过程的完整矩阵元素$ \ text {p} \ text {p} \ to to {\text{e}}^+ν_{\text{e}}\,μ^-\barν_μ\,τ^+ν_τ\,{\text{b}}\,\bar{\text{b}}$, all off-shell, spin-correlation, and interference effects are included. NLO QCD校正大约为集成横截面的$ 20 \％$。使用动态刻度，对大多数分布的更正位于同一级别，而某些分布在被抑制的相位空间区域中显示出更大的$ k $ factor。我们已经基于双极近似进行了第二次计算。尽管相应的结果与集成横截面的全部计算相一致，但差异可以达到$ 10 \％$，而在不受TOP-ANTITOP生产主导的相位空间区域的范围内。结果，壳计算仅应被信任到这种准确性水平。
We present results of a computation of NLO QCD corrections to the production of an off-shell top--antitop pair in association with an off-shell $\text{W}^+$ boson in proton--proton collisions. As the calculation is based on the full matrix elements for the process $\text{p}\text{p}\to {\text{e}}^+ν_{\text{e}}\,μ^-\barν_μ\,τ^+ν_τ\,{\text{b}}\,\bar{\text{b}}$, all off-shell, spin-correlation, and interference effects are included. The NLO QCD corrections are about $20\%$ for the integrated cross-section. Using a dynamical scale, the corrections to most distributions are at the same level, while some distributions show much larger $K$-factors in suppressed regions of phase space. We have performed a second calculation based on a double-pole approximation. While the corresponding results agree with the full calculation within few per cent for integrated cross-sections, the discrepancy can reach $10\%$ and more in regions of phase space that are not dominated by top--antitop production. As a consequence, on-shell calculations should only be trusted to this level of accuracy.
