匹配部分子簇射的SMEFT中NLO阶$h\ o b\ar{b}$衰变事件产生器
An event generator for $h\to b\bar{b}$ decays at NLO in SMEFT matched to a parton shower
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中文总结 AI 辅助
本文在Sherpa中实现了SMEFT维度六算符下$h\ o b\ar b$衰变的NLO QCD修正并匹配部分子簇射，包含虚弱效应，展示了与$Zh$产生结合的可行性，为SMEFT研究奠定基础。
中文摘要 AI 辅助
我们展示了Sherpa对维度六标准模型有效场论（SMEFT）中基准过程$h\ o b\ar b$的NLO修正的实现。该计算包括使用MCatNLO型框架针对衰变过程匹配部分子簇射的NLO QCD修正。虚弱效应以不同电弱输入方案下的两体矩阵元修正形式包含在内，相应的衰变事件也通过QCD部分子簇射进行演化。我们给出了包含衰变率和希格斯玻色子静止系中微分分布的数值结果，并展示了如何通过将其嵌入LHC上的关联$Zh$产生过程，将衰变实现与独立产生的产生样本相结合。这一原理验证实现展示了如何将NLO SMEFT修正纳入广泛使用的Sherpa事件产生器，为扩展到其他过程以及在该框架内使用真实最终态和 fiducial 截断进行SMEFT研究提供了基础。
英文摘要
We present a Sherpa implementation of NLO corrections in dimension-six Standard Model Effective Field Theory (SMEFT) to the benchmark process $h\to b\bar b$. The calculation includes NLO QCD corrections matched to a parton shower using an MCatNLO-type framework for decays. Virtual weak effects are included as two-body matrix-element corrections in different electroweak input schemes, with the corresponding decay events also evolved with the QCD parton shower. We present numerical results for the inclusive decay rate and for differential distributions in the Higgs-boson rest frame, and illustrate how the decay implementation can be combined with an independently generated production sample by embedding it in associated $Zh$ production at the LHC. This proof-of-principle implementation demonstrates how NLO SMEFT corrections can be incorporated into the widely used Sherpa event generator, providing a basis for extensions to other processes and for SMEFT studies with realistic final states and fiducial cuts within that framework.
