We present a new calculation of next-to-leading order QCD corrections to electroweak top-quark pair hadroproduction in extensions of the Standard Model (SM) with extra heavy neutral and charged spin-1 resonances which considerably extends and improves an earlier calculation performed by some of us. In particular, we allow for flavor-non-diagonal $Z^{\prime }$ couplings and take into account nonresonant production in the SM and beyond including the contributions with $t$-channel $W$ and $W^{\prime }$ bosons. As a result, models with a more complicated flavor structure which have been proposed to explain the flavor anomalies in $B$ decays can now be accommodated in our code. Moreover, the new $t$-channel contributions lead to improved cross sections predictions at higher energies beyond the LHC reach. All amplitudes are generated using the recola2 package. As in our previous work, we include next-to-leading order QCD corrections and consistently match to parton showers with the POWHEG method fully taking into account the interference effects between the SM and new physics amplitudes. We consider the sequential Standard Model, the topcolor model, as well as the third family hypercharge model featuring non-flavor-diagonal $Z^{\prime }$ couplings and present numerical results for $t\overline{t}$ cross sections at hadron colliders with a center-of-mass energy up to 100 TeV.

中文翻译：

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POWHEG 中 NLO QCD 在重 Z' 和 W' 玻色子存在下的电弱氢生成

我们在标准模型 (SM) 的扩展中提出了对电弱顶夸克对强子产生的次前导阶 QCD 校正的新计算，具有超重中性和带电自旋 1 共振，这大大扩展和改进了早期的计算我们中的一些人。特别是，我们允许风味非对角线$Z^{\prime }$ 耦合并考虑到 SM 及其他地方的非共振产生，包括 $吨$-渠道 $宽$ 和 ${宽}^{\prime }$玻色子。因此，已经提出了具有更复杂风味结构的模型来解释$乙$现在可以在我们的代码中容纳衰减。此外，新$吨$-channel 贡献导致在 LHC 范围之外的更高能量下改进横截面预测。所有振幅都是使用recola 2 包生成的。与我们之前的工作一样，我们包括次领先的 QCD 校正，并使用 POWHEG 方法始终匹配部分阵雨，充分考虑了 SM 和新物理幅度之间的干扰效应。我们考虑序列标准模型、topcolor 模型以及具有非风味对角线的第三族超充电模型$Z^{\prime }$ 耦合并给出数值结果 $吨\overline{吨}$ 质心能量高达 100 TeV 的强子对撞机的横截面。