Title: First simultaneous global QCD analysis of kaon and pion parton distributions with lattice QCD constraints Show Chinese title

Title: 首次同时全球QCD分析的K介子和π介子部分子分布与格点QCD约束

Abstract: We perform the first simultaneous global QCD analysis of pion and kaon parton distribution functions (PDFs), constrained by pion- and kaon-induced Drell-Yan (DY) and leading neutron electroproduction data, together with lattice QCD data on pion and kaon PDF moments. The analysis indicates a softer valence $\bar u$ distribution in the $K^-$ than in the $\pi^-$, and a significantly more peaked valence $s$-quark density in $K^-$ compared with the $\bar u$. The effective exponent governing the high-$x$ behavior of the PDF is found to be larger for $\bar u$ in the kaon, $\beta_{\bar u}^{K^-}\!= 1.6(2)$, than in the pion, $\beta_{\bar u}^{\pi^-}\!= 1.16(4)$, in the range $0.7 \leq x \leq 0.95$. From the gluon momentum fractions we find the pion's gluon content accounts for $\approx 1/3$ of the mass budget of the pion at $\mu=2~{\rm GeV}$, but only $\approx 1/4$ for the kaon. Show Chinese abstract

Abstract: 我们进行了首次同时的全球QCD分析，涉及介子和K介子部分子分布函数（PDF），受介子和K介子诱导的Drell-Yan（DY）和领先中子电产数据以及介子和K介子PDF矩的格点QCD数据的约束。该分析表明，在$K^-$中的价夸克$\bar u$分布比在$\pi^-$中更软，并且在$K^-$中的价夸克$s$密度相比$\bar u$显著更尖锐。 有效指数决定了PDF在高$x$行为，发现在K介子中$\bar u$比$\beta_{\bar u}^{K^-}\!= 1.6(2)$在范围$0.7 \leq x \leq 0.95$中的π介子$\beta_{\bar u}^{\pi^-}\!= 1.16(4)$更大。 从胶子动量分数我们发现，π介子的胶子含量在$\approx 1/3$占了π介子质量预算的一部分，但在$\mu=2~{\rm GeV}$时仅占KM介子的$\approx 1/4$。