论文标题
在具有巨大颗粒的横截面中重新召集非全球对数
Resummation of non-global logarithms in cross sections with massive particles
论文作者
论文摘要
开发了涉及大量有色颗粒（例如顶部夸克）的喷射过程的形式化形式，从而扩展了无质量情况的早期结果。在有效的现场理论框架中实现了基础硬过程中软排放的分解，这构成了重新对数的基础。重新归一化组的进化产生了非全球对数，将其实现为大$ n_c $限制的Parton淋浴代码。在比较了巨大和无质量的辐射模式之后，考虑到顶部夸克的生产和衰减，计算了$ t \ bar {t} $生产的横截面和其他中央射流活动的否决。领先对数的重新召集导致对Atlas测量的改进描述，$ \ sqrt {s} = 7 \，{\ rm tev} $。
A factorization formalism for jet processes involving massive colored particles such as the top quark is developed, extending earlier results for the massless case. The factorization of soft emissions from the underlying hard process is implemented in an effective field theory framework, which forms the basis for the resummation of large logarithms. The renormalization group evolution giving rise to non-global logarithms is implemented into a parton shower code in the large-$N_c$ limit. After a comparison of the massive and massless radiations patterns, the cross section for $t\bar{t}$ production with a veto on additional central jet activity is computed, taking into account radiation both from the production and the decay of the top quarks. The resummation of the leading logarithms leads to an improved description of ATLAS measurements at $\sqrt{s}=7\,{\rm TeV}$.
