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arXiv 0911.1024hep-ph
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胶子结构函数的新探讨

A New Approach to the Gluon Structure Function

D. Grünewald, E. -M. Ilgenfritz, H. J. Pirner

摘要:

本文用一种新的方法计算了色偶极的胶子结构函数,该方法计算了沿光锥方向分离的SU(2)胶子场算符的矩阵元。对于纯胶区的真空态,我们采用了近光锥哈密顿量的变分基态。在质子中,胶子的平均动量分数固定为“实验值”,得到的胶子结构函数的偶极状态与四个链接进行了定性比较,NLO \emph{MRST} 2002参数化在$Q^2=1.5 \mathrm{GeV}^2$。

英文摘要:

We calculate the gluon structure function of a color dipole in a new approach evaluating the matrix elements of SU(2) gluon field operators separated along a direction close to the light cone. As vacuum state in the pure glue sector, we use a variational ground state of the near-light-cone Hamiltonian. With a mean momentum fraction of the gluons fixed to the "experimental value" in a proton, the resulting gluon structure function for a dipole state with four links is compared qualitatively to the NLO \emph{MRST} 2002 parameterization at $Q^2=1.5 \mathrm{GeV}^2$.

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