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arXiv 1104.0850hep-ph
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微扰QCD演化与色偶极图像

Perturbative QCD Evolution and Color Dipole Picture

Dieter Schildknecht

摘要:

小Bjorken- $x$和$10 {\rm GeV}^2 \le Q^2 \le 100 {\rm GeV}^2$衍射区的质子结构函数表现为$F_2 (x, Q^2) = F_2 (W^2) = f_0 \cdot (W^2)^{C_2}$,其中$x = Q^2 / W^2$。根据味单夸克分布的演化预测了$γ^* p$质心能量平方的指数$W^2$,并拟合了唯一的自由参数,归一化$C_2 = 0.29$。胶子密度乘以$α_s (Q^2)$的演化与味单重态夸克密度的演化是一致的。这个简单的图像与基于味单态和胶子密度耦合方程的标准进化方法不同。

英文摘要:

The proton structure function in the diffraction region of small Bjorken-$x$ and $10 {\rm GeV}^2 \le Q^2 \le 100 {\rm GeV}^2$ behaves as $F_2 (x, Q^2) = F_2 (W^2) = f_0 \cdot (W^2)^{C_2}$, where $x = Q^2 / W^2$. The exponent $C_2$ of the $γ^* p$ center-of-mass energy squared, $W^2$, is predicted from evolution of the flavor-singlet quark distribution, $C_2 = 0.29$, and the only free parameter, the normalization $f_0 = 0.063$, is fitted. The evolution of the gluon density multiplied by $α_s (Q^2)$ is dentical to the evolution of the flavor-singlet quark density. This simple picture is at variance with the standard approach to evolution based on the coupled equations of flavor-singlet and gluon density.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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