发表机构
Karlsruhe Institute of Technology (KIT); Radboud University Nijmegen; Università di Padova; Istituto Nazionale di Fisica Nucleare, Sezione di Padova（卡尔斯鲁厄理工学院; 奈梅亨拉德堡德大学; 帕多瓦大学; 意大利国家核物理研究所帕多瓦分部）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究对比了SMEFT中威尔逊系数对希格斯玻色子对产生截面的影响，考虑NLO QCD修正，识别出微分分布存在显著形状畸变的基准情景，揭示线性近似在大反常耦合下的失效。
AI 中文摘要
我们针对维度-6 SMEFT中威尔逊系数对希格斯玻色子对产生截面的影响展开对比研究，同时纳入圈压低算符。本研究考虑了NLO QCD修正，且基于截面随威尔逊系数变化的多项式参数化更新版本。我们聚焦于希格斯玻色子对不变质量及领头希格斯玻色子横动量的微分分布，识别出在$m_{hh}$与$p_{T,h}$分布中呈现显著形状畸变的基准情景。部分此类情景在SMEFT展开的纯线性截断下仍具有物理意义，其余情景在忽略二次维度-6贡献时会产生非物理微分截面，暴露出线性近似在大反常耦合下的失效。
英文摘要
We present a comparative study of the influence of Wilson coefficients on Higgs boson pair production cross sections in SMEFT up to dimension-6, also including loop-suppressed operators. Our study accounts for NLO QCD corrections, and is based on updated parametrizations of the cross section as a polynomial in the Wilson coefficients. We focus on differential distributions for the Higgs boson pair invariant mass, as well as the transverse momenta of the leading Higgs bosons, identifying benchmark scenarios exhibiting pronounced shape distortions in the $m_{hh}$ and $p_{T,h}$ distributions. While some of these scenarios remain physically meaningful under a purely linear truncation of the SMEFT expansion, others yield unphysical differential cross sections when quadratic dimension-6 contributions are omitted, exposing the breakdown of the linear approximation for large anomalous couplings.
CommentsContribution to LHCHWG Report 5
