arXiv 1605.061422016-05hep-ph

强子对撞机

Vincia for Hadron Colliders

Nadine Fischer, Stefan Prestel, Mathias Ritzmann, Peter Skands

DOI：: 10.1140/epjc/s10052-016-4429-6

摘要：

我们提出了第一个公开实施的天线为基础的QCD初始和最终状态淋浴。簇射核是$2\to 3$天线函数，它不仅捕获了QCD矩阵元的共线动力学，而且捕获了QCD矩阵元的主要软（相干）奇异性。我们定义演化测度与主导极点成反比，因此胶子发射在与程函成反比的$p_\perp$测度中演化，而仅包含单极的过程（例如，$g\to q\bar{q}$）在虚拟中进化。无序发射是允许的，通过额外的$1/Q^2$幂抑制。螺旋和运动学由精确的壳层上$2\to 3$相空间因式分解控制。这第一个实现仅限于无质量QCD部分子和无色共振。树级矩阵元校正包括QCD高达$\mathcal{O}(α_s^4)$（4喷流），和Drell-Yan和希格斯生产高达$\mathcal{O}(α_s^3)$（$V/H$ + 3喷流）。由此产生的算法已在Vincia 2.0中公开提供。

英文摘要：

We present the first public implementation of antenna-based QCD initial- and final-state showers. The shower kernels are $2\to 3$ antenna functions, which capture not only the collinear dynamics but also the leading soft (coherent) singularities of QCD matrix elements. We define the evolution measure to be inversely proportional to the leading poles, hence gluon emissions are evolved in a $p_\perp$ measure inversely proportional to the eikonal, while processes that only contain a single pole (e.g., $g\to q\bar{q}$) are evolved in virtuality. Non-ordered emissions are allowed, suppressed by an additional power of $1/Q^2$. Recoils and kinematics are governed by exact on-shell $2\to 3$ phase-space factorisations. This first implementation is limited to massless QCD partons and colourless resonances. Tree-level matrix-element corrections are included for QCD up to $\mathcal{O}(α_s^4)$ (4 jets), and for Drell-Yan and Higgs production up to $\mathcal{O}(α_s^3)$ ($V/H$ + 3 jets). The resulting algorithm has been made publicly available in Vincia 2.0.

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