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arXiv 1302.0846hep-phhep-exnucl-th
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NNLL Higgs + One喷流的喷流质量谱

Jet Mass Spectra in Higgs + One Jet at NNLL

Teppo T. Jouttenus, Iain W. Stewart, Frank J. Tackmann, Wouter J. Waalewijn

摘要:

喷流的不变质量是描述大型强子对撞机喷流结构的基准变量。我们计算喷流质量谱希格斯粒子加一个喷流在LHC在下一个到下一个到领先的对数(NNLL)使用因式分解公式。在这个量级上,截面对软m_jet ^2/p_T^喷流尺度下的微扰理论变得敏感。我们的计算是排他性的,并使用1-jettiness全局事件形状来对其他喷气机实施否决。通过对频谱进行归一化,去除了对喷流否决的主要依赖,留下了取决于喷流质量和喷流否决变量的比率的来自非全局性矩阵的残余依赖。对于我们的专属射流截面,这些非全局的参数化的小比在包容性的情况下,使我们能够获得一个完整的NNLL结果。给出了射流质谱对运动学、射流算法和射流尺寸R的依赖性的结果。使用单独的部分子通道,我们说明了夸克和胶子喷流的喷流质量谱之间的差异。我们还研究了强子化和下伏事件对PYTHIA喷流质量的影响。为了突出包容性和排他性喷流质谱的相似性,比较LHC数据。

英文摘要:

The invariant mass of a jet is a benchmark variable describing the structure of jets at the LHC. We calculate the jet mass spectrum for Higgs plus one jet at the LHC at next-to-next-to-leading logarithmic (NNLL) order using a factorization formula. At this order, the cross section becomes sensitive to perturbation theory at the soft m_jet^2/p_T^jet scale. Our calculation is exclusive and uses the 1-jettiness global event shape to implement a veto on additional jets. The dominant dependence on the jet veto is removed by normalizing the spectrum, leaving residual dependence from non-global logarithms depending on the ratio of the jet mass and jet veto variables. For our exclusive jet cross section these non-global logarithms are parametrically smaller than in the inclusive case, allowing us to obtain a complete NNLL result. Results for the dependence of the jet mass spectrum on the kinematics, jet algorithm, and jet size R are given. Using individual partonic channels we illustrate the difference between the jet mass spectra for quark and gluon jets. We also study the effect of hadronization and underlying event on the jet mass in PYTHIA. To highlight the similarity of inclusive and exclusive jet mass spectra, a comparison to LHC data is presented.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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