论文标题
约束pion诱导的$ j/ψ$生产的$ x $的乳尖密度
Constraining gluon density of pions at large $x$ by pion-induced $J/ψ$ production
论文作者
论文摘要
从各种全球拟合中获得的锥体的GLUON分布在它们之间显示出很大的变化。在颜色蒸发模型的框架内，我们表明，现有的Pion诱导的$ J/ψ$生产数据（通常不包含在全球拟合中）可以对Pion Parton分布功能（PDFS）施加有用的其他约束。特别是，这些数据可以以$ x $的大量探测斜锥的密度。将现有的PION诱导的$ J/ψ$数据与使用各种PION PDFS的近代到领先阶QCD计算进行比较。发现在正向速度和足够的远光灯下测量的$ j/ψ$数据对亲质的$ x $ gluon分布敏感。当前的$ j/ψ$数据有利于Sutton-Martin-Roberts-Strirling和Gluck-Reya-Vogt pion PDFS，其中包含$ x $的大量Gluon含量。
The gluon distributions of the pion obtained from various global fits exhibit large variations among them. Within the framework of the color evaporation model, we show that the existing pion-induced $J/ψ$ production data, usually not included in the global fits, can impose useful additional constraints on the pion parton distribution functions (PDFs). In particular, these data can probe the pion's gluon densities at large $x$. Existing pion-induced $J/ψ$ data covering a broad range of beam momenta are compared with next-to-leading-order QCD calculations using various sets of pion PDFs. It is found that $J/ψ$ data measured at forward rapidity and at sufficiently high beam momentum are sensitive to the large-$x$ gluon distribution of pions. The current $J/ψ$ data favor the Sutton-Martin-Roberts-Stirling and Gluck-Reya-Vogt pion PDFs, containing significant gluon content at large $x$.
