Hard photons in hadroproduction of top quarks with realistic final states
Hard photons in hadroproduction of top quarks with realistic final states
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DOI：
10.1007/jhep10(2018)158
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发表时间：
2018-03
影响因子：
5.4
通讯作者：
G. Bevilacqua;H. Hartanto;M. Kraus;T. Weber;M. Worek
中科院分区：
文献类型：
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作者：
G. Bevilacqua;H. Hartanto;M. Kraus;T. Weber;M. Worek
我们给出了双轻子通道中与硬光子相关的顶夸克对产生的完整描述。我们的计算结果与QCD中的NLO比较准确。它基于{e}^{+}{\nu}_e{\u}^{-}{<sup>u</sup>{<sup>u</sup>b<sup>b</sup>产生的矩阵元素，包括顶夸克和W规范玻色子的所有共振和非共振图、干涉和离壳层效应。这一计算构成了QCD中NLO强子碰撞中用末态光子产生顶夸克对的第一次完整计算。给出了质心能量为TeV的大型强子对撞机的总截面和微分截面的数值结果。对于一些与新的物理搜索相关的观测数据，超出了一些运动学界限，我们观察到了超过100%的形状扭曲。此外，我们还证实了总截面的顶夸克离壳效应的大小与窄宽度近似的预期不确定性是一致的。给出的结果不仅与Beyond标准模型物理搜索有关，而且对于精确测量大型强子对撞机上的顶夸克基准面和顶夸克性质也很重要。
We present a complete description of top quark pair production in association with a hard photon in the dilepton channel. Our calculation is accurate to NLO in QCD. It is based on matrix elements for\({e}^{+}{\nu} _e {\mu}^{-}{\overline {\nu}} _ {\mu} b\overline {b}\upgamma\) production and includes all resonant and non-resonant diagrams, interferences, and off-shell effects of the top quarks and the W gauge bosons. This calculation constitutes the first full computation for top quark pair production with a final state photon in hadronic collisions at NLO in QCD. Numerical results for total and differential cross sections are presented for the LHC at a centre-of-mass energy ofTeV. For a few observables relevant for new physics searches, beyond some kinematic bounds, we observe shape distortions of more than 100%. In addition, we confirm that the size of the top quark off-shell effects for the total cross section is consistent with the expected uncertainties of the narrow width approximation. Results presented here are not only relevant for beyond the Standard Model physics searches but also important for precise measurements of the top-quark fiducial cross sections and top-quark properties at the LHC.