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arXiv 1808.00899hep-ph
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单重态结构函数演化的阴影修正

Shadowing corrections to the evolution of singlet structure function

Mayuri Devee

摘要:

本文用半解析方法求解了Gribov-Levin-Ryskin-Mueller-Qiu(GLR-MQ)海夸克分布演化方程,并研究了胶子阴影效应对单重态结构函数F_2^S(x,Q^2)的小x和中等Q^2行为的影响.经过阴影修正后的单重态结构函数的预测值与不同的实验数据以及参数化具有可比性。在我们的预言中观察到胶子复合的特征是非常有趣的。我们注意到,随着x的减小,单态结构函数的快速增长最终被胶子复合在QCD演化中出现的阴影或非线性项所抑制。这种对小x的遮蔽单重态结构函数的驯服行为在热点(R=2 GeV^{-1})处变得显著。此外,有遮蔽与无遮蔽的{F_2^S(x,Q^2)}之比的计算值清楚地表明,对于较小的x和Q^2值,非线性效应起着越来越重要的作用。

英文摘要:

We report a semi-analytical approach for the solution of the nonlinear Gribov-Levin-Ryskin-Mueller-Qiu (GLR-MQ) evolution equation for sea quark distribution and investigate the effect of gluon shadowing on the small-x and moderate-Q^2 behaviour of singlet structure function, F_2^S(x,Q^2). The predicted values of singlet structure functions with shadowing corrections are comparable with different experimental data as well as parametrizations. It is very fascinating to observe signatures of gluon recombination in our predictions. We note that, with decreasing x the the rapid growth of singlet structure function is eventually tamed by the shadowing or nonlinear term appeared in the QCD evolution due to gluon recombination. This taming behaviour of shadowing singlet structure function towards small-x become significant at the hot spots, at R=2 GeV^{-1}. Further the computed values of the ratio of {F_2^S(x,Q^2)} with shadowing to that without shadowing clearly indicate that towards smaller values of x and Q^2 the nonlinear effects play an increasingly important role.

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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