AI 中文总结
该研究利用CMS实验13 TeV质子-质子碰撞数据，采用有效场论方法，通过机器学习分类器约束异常规范玻色子耦合及矢量玻色子-夸克耦合，给出了相关威尔逊系数的最严格约束。
AI 中文摘要
利用大型强子对撞机（LHC）上CMS实验记录的质心系能量为13 TeV的质子-质子碰撞数据集，对应积分亮度为138 fb⁻¹，采用有效场论方法寻找超出标准模型的偏差。本研究对对应六维有效场论算符的威尔逊系数进行约束，这些算符会导致异常规范玻色子自耦合以及矢量玻色子与夸克之间的耦合发生改变。研究考虑了双玻色子（WW和WZ）产生过程，其中一个W玻色子衰变为轻子加反中微子或其电荷共轭态，另一个W或Z玻色子发生强子衰变。由于异常耦合的贡献预计在高能标下最为显著，研究重点放在W或Z玻色子的强子衰变产物合并为单个大半径喷注的末态。采用一种基于机器学习的专用分类器，将W和Z玻色子的强子衰变与本底过程区分开来。研究报告了迄今为止对对应异常三重规范玻色子耦合算符的威尔逊系数施加的最严格约束，对矢量玻色子与夸克之间耦合设定的界限与之前的包含喷注测量结果相比具有竞争力。
英文摘要
A search for deviations from the standard model using an effective field theory approach is carried out using the proton-proton collision data set recorded by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 138 fb$^{-1}$. In this study Wilson coefficients corresponding to dimension-six effective field theory operators that would lead to anomalous gauge boson self-couplings and modified couplings between vector bosons and quarks are constrained. Diboson (WW and WZ) production processes with one W boson decaying to a lepton plus antineutrino or charge conjugate and the second W or Z boson decaying hadronically are considered. Since the contribution from anomalous couplings is expected to be most visible at high energy scales, the focus is on final states where the hadronic decay products of a W or Z boson are merged into a single large-radius jet. A dedicated classifier based on machine learning is employed to separate hadronic W and Z boson decays from background processes. The most stringent constraints to date on the Wilson coefficients of operators corresponding to anomalous triple gauge boson couplings are reported. The bounds set on the couplings between vector bosons and quarks are competitive with those from previous inclusive jet measurements.
CommentsSubmitted to Physics Letters B. All figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/SMP-25-001 (CMS Public Pages)
