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arXiv 1401.0653hep-ph
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非线性GLR-MQ演化方程与胶子分布函数的Q^2演化

Nonlinear GLR-MQ evolution equation and Q^2-evolution of gluon distribution function

Mayuri Devee, J. K. Sarma

摘要:

本文求解了胶子分布函数G(x,Q^2)的非线性Gribov-Levin-Ryskin-Mueller-Qiu(GLR-MQ)演化方程,并研究了非线性GLR-MQ修正对首阶(LO)Dokshitzer-Gribov-Lipatov-Altarelli-Parisi(DGSTH)演化方程的影响.在这里,我们纳入一个Regge的胶子分布函数的行为,以获得GLR-MQ演化方程的解决方案。我们还从GLR-MQ演化方程的解研究了胶子分布函数对Q^2的依赖性。此外,有趣的是,从我们的结果中观察到,非线性随着两个相互作用胶子之间的关联半径(R)的减小而增加。结果还证实,胶子分布函数在R=5 GeV^{-1}处出现陡峭的行为,而在R=2 GeV^{-1}处,随着Q^2的增大,胶子分布函数随x的减小而降低。在本工作中,我们还检查了计算中λ_G的灵敏度。我们的计算结果进行了比较所获得的全球DGMENS拟合的部分子分布函数,即GRV,MRST,MSTW和EHKQS模型。

英文摘要:

In this paper we have solved the nonlinear Gribov-Levin-Ryskin-Mueller-Qiu (GLR-MQ) evolution equation for gluon distribution function G(x,Q^2) and studied the effects of the nonlinear GLR-MQ corrections to the Leading Order (LO) Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) evolution equations. Here we incorporate a Regge like behaviour of gluon distribution function to obtain the solution of GLR-MQ evolution equation. We have also investigated the Q^2-dependence of gluon distribution function from the solution of GLR-MQ evolution equation. Moreover it is interesting to observe from our results that nonlinearities increase with decreasing correlation radius (R) between two interacting gluons. Results also confirm that the steep behavior of gluon distribution function is observed at R=5 GeV^{-1}, whereas it is lowered at R=2 GeV^{-1} with decreasing x as Q^2 increases. In this work we have also checked the sensitivity of λ_G in our calculations. Our computed results are compared with those obtained by the global DGLAP fits to the parton distribution functions viz. GRV, MRST, MSTW and with the EHKQS model.

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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