论文标题
NNLO的$ t $ channel中的单顶夸克
Single-top-quark production in the $t$-channel at NNLO
论文作者
论文摘要
我们介绍了NNLO的五种风味方案中T通道单顶Quark的产生和衰减的计算。我们的结果解决了此过程的两个先前计算之间的分歧，发现在NNLO系数本身的水平上，包容性横截面有差异。我们将详细的计算与以前的计算相提并论，包括固定比例$μ= m_t $，包括B Quark标记。此外，我们主张使用双重非弹性散射（DDIS）尺度（$μ^2 = q^2 $ for Light-quark Line，$μ^2 = q^2+m_t+m_t^2 $ for the Regie-Qark Line）最大化扰动稳定性，并允许稳健的量表不认同。所有nnlo和nlo $ \，\ otimes \，生产和衰减的$ nlo贡献都包含在壳和顶点功能近似中。我们为标准模型和超越标准模型分析中使用的各种可观察到的结果提供了基准和差异结果，并找到了NLO和NNLO预测的独家$ T+N $ -JET交叉部分之间的重要差异。总体而言，我们发现NNLO校正对于精确识别T通道过程至关重要。
We present a calculation of t-channel single-top-quark production and decay in the five-flavor scheme at NNLO. Our results resolve a disagreement between two previous calculations of this process that found a difference in the inclusive cross section at the level of the NNLO coefficient itself. We compare in detail with the previous calculations at the inclusive, differential and fiducial level including b-quark tagging at a fixed scale $μ=m_t$. In addition, we advocate the use of double deep inelastic scattering (DDIS) scales ($μ^2=Q^2$ for the light-quark line and $μ^2=Q^2+m_t^2$ for the heavy-quark line) that maximize perturbative stability and allow for robust scale uncertainties. All NNLO and NLO$\,\otimes\,$NLO contributions for production and decay are included in the on-shell and vertex-function approximation. We present fiducial and differential results for a variety of observables used in Standard Model and Beyond Standard Model analyses, and find an important difference between the NLO and NNLO predictions of exclusive $t+n$-jet cross sections. Overall we find that NNLO corrections are crucial for a precise identification of the t-channel process.
