论文标题
在强子山子的喷气机和Z玻色子之间的方位角去相关
Azimuthal decorrelation between a jet and a Z boson at hadron colliders
论文作者
论文摘要
我们重新访问喷气机与$ Z $玻色子在强子山着物生产的$ z $玻色之间的方位角去相关$ δϕ $。使用不同的重组方案为喷气机进行，导致该数量分布的NLL示意预测显着不同。具体来说，当喷气机用$ e $ -scheme（即四摩托姆添加）重建时，在$ k_t $或抗$ k_t $ cromenting算法中，由于存在非全球性和/或或/或聚类的差异。我们以两个循环分析对对数进行分析评估这些对数，并以数值为单位 - $ \ Mathrm {n_c} $限制中的所有订单，并呈现$ δϕ $的完整nll重新召集。我们通过包括$ \ Mathcal {o}（α_s）$ nlo校正，将重新量分布的扰动扩展的扰动扩展的准确性扩展到NNLL的精度。我们将我们的发现与各种蒙特卡洛事件生成器的结果以及CMS协作的实验数据进行了比较。
We revisit the azimuthal decorrelation $δϕ$ between a jet and a $Z$ boson produced at hadron colliders. Employing different recombination schemes for the jets leads to significantly different NLL-resummed predictions for the distribution of this quantity. Specifically when the jets are reconstructed with the $E$-scheme (i.e., four-momentum addition) in the $k_t$ or anti-$k_t$ clustering algorithms, then the resummation becomes highly non-trivial due to the presence of non-global and/or clustering logarithms. We evaluate these logarithms analytically at two loops and numerically to all orders in the large-$\mathrm{N_c}$ limit, and present a full NLL resummation of $δϕ$. We extend the accuracy of the perturbative expansion of the resummed distribution at fixed order to NNLL accuracy by including $\mathcal{O}(α_s)$ NLO corrections obtained with MadGraph5_aMC@NLO. We compare our findings with results of various Monte Carlo event generators and with experimental data from the CMS collaboration.
