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arXiv 2006.03055hep-phnucl-th
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色单重态截面的共线展开

Collinear expansion for color singlet cross sections

Markus A. Ebert, Bernhard Mistlberger, Gherardo Vita

摘要:

我们演示了如何有效地扩大截面的颜色单态生产在强子对撞机周围的运动学极限的所有末态辐射共线的入射强子之一。这种扩展是系统地改进和适用于一个大类的物理可观的。我们证明了这种技术的可行性,通过获得的前两项在共线展开的胶子融合希格斯玻色子生产截面的快度分布在次到次到领先阶(NNLO)在QCD微扰理论。此外,我们说明了如何使用这种技术来提取通用积木的散射截面一样的N-jettiness和横向动量束函数在NNLO。

英文摘要:

We demonstrate how to efficiently expand cross sections for color-singlet production at hadron colliders around the kinematic limit of all final state radiation being collinear to one of the incoming hadrons. This expansion is systematically improvable and applicable to a large class of physical observables. We demonstrate the viability of this technique by obtaining the first two terms in the collinear expansion of the rapidity distribution of the gluon fusion Higgs boson production cross section at next-to-next-to leading order (NNLO) in QCD perturbation theory. Furthermore, we illustrate how this technique is used to extract universal building blocks of scattering cross section like the N-jettiness and transverse momentum beam function at NNLO.

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