论文标题
Hera高精度数据的颜色偶极子图片中的渐近Gluon密度
Asymptotic gluon density within the color dipole picture in the light of HERA high-precision data
论文作者
论文摘要
We present an analysis of the most precise set of HERA data within the color dipole formalism, by using an analytical gluon density, based on the double-logarithm approximation of the DGLAP equations in the asymptotic limit of the scaling variable, $σ=\log{(1/x)}\log{(\log{(Q^2/Q_ 0^2)})}\rightarrow \ infty $。对数据的拟合，包括魅力和底部夸克，并在宽范围内$ q^2：（1.5,500）$σ_{r} $描述了模型的效率：（1.5,500）$ gev $^2 $对于两个偶极模型，包括parton饱和效应。我们还对$ f_ {2}^{c \ bar {c}} $，$ f_ {2}^{b \ bar {b}} $和$ f_ {l} $给出了预测，所有这些都以$ q^2：（2.5,5,120）$ GEV $^2 $在范围内很好地描述了数据。与HERA数据和LHCB的最新测量值相比，还计算并成功地计算出$ J/ψ$的独家光生效的总横截面。
We present an analysis of the most precise set of HERA data within the color dipole formalism, by using an analytical gluon density, based on the double-logarithm approximation of the DGLAP equations in the asymptotic limit of the scaling variable, $σ=\log{(1/x)}\log{(\log{(Q^2/Q_ 0^2)})}\rightarrow \infty$. Fits to data, including charm and bottom quarks are performed and demonstrate the efficiency of the model in describing the reduced cross section, $σ_{r}$, in the wide range $Q^2:(1.5,500)$ GeV$^2$ for two dipole models including parton saturation effects. We also give predictions to $F_{2}^{c\bar{c}}$ , $F_{2}^{b\bar{b}}$ and $F_{L}$, all describing the data reasonably well in the range $Q^2:(2.5,120)$ GeV$^2$. Total cross sections of exclusive photoproduction of $J/ψ$ and $ρ$ are also calculated and successfully compared to HERA data and recent measurements at LHCb.
