共查询到19条相似文献,搜索用时 81 毫秒
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大型强子对撞机(LHC)能探测到核子中很小x的动力学区域.在此动力学区域部分子的密度很大,根据高扭度修正过的AP演化方程(MDAP方程),分析了此区域的部分子饱和问题.发现在LHC能区不会出现饱和现象,但部分子分布会由于高扭度效应而明显被抑制,出现部分饱和现象.根据MDAP演化方程,还对LHC能区的部分子分布进行了预言 相似文献
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本文利用分布函数的动力学模型, 改进了Buras和Gaemers关于胶子分布函数的参数化工作[4], 得到了一个能较好地满足QCD演化方程(LLA近似)的胶子分布函数的简单参数式. 在这基础上分析了核子中胶子成份的性质, 指出胶子分布函数可以看作由软、硬两个不同部分所组成的. 相似文献
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在既考虑到泄漏在束缚核子外的海夸克与胶子间的重组,又考虑到仍束缚在核子内的部分子由于其禁闭空间的变化而发生的演化的基础上,给出了核内胶子分布函数的普遍形式,并具体计算了锡梭与碳核的胶子分布比,结果与NMC实验合作组的最新实验相一致. 相似文献
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把多时关联Green函数的运动方程转变成等时关联Green函数的运动方程,其中包括夸克和胶子的密度矩阵的运动方程以及顶角函数的运动方程.在二体关联截断近似下,给出运动方程、高斯定律和Ward恒等式的明显表达式. 相似文献
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Comparisons between the additional parton evolution (APE) model and Q2-rescaling (QR) model based on the recombination effect are made by means of investigating deep-inelastic (DIS) structure functions F2A, nuclear Drell-Yan process and nuclear gluon distributions. While explaining experimentally measured F2A(x) structure functions, the difference in the recombination results of the two models mainly lies in their sensitivity to input parton distributions and Q2-dependence. In predicting the nuclear Drell-Yan ratio, the APE model gives more reasonable results in the small x region than those of the QR model. The two motlels offer similar predictions of the nuclear gluon ratio Gsn(x)/Gc(x) which are extracted from the inelastic J/ψ production process. 相似文献
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P. Abreu et al. 《The European Physical Journal C - Particles and Fields》2000,13(4):573-589
The fragmentation functions of quarks and gluons are measured in various three-jet topologies in Z decays from the full data
set collected with the Delphi detector at the Z resonance between 1992 and 1995. The results at different values of transverse momentum-like scales are
compared. A parameterization of the quark and gluon fragmentation functions at a fixed reference scale is given. The quark
and gluon fragmentation functions show the predicted pattern of scaling violations. The scaling violation for quark jets as
a function of a transverse momentum-like scale is in a good agreement with that observed in lower energy annihilation experiments. For gluon jets it appears to be significantly stronger. The scale dependences of the gluon and
quark fragmentation functions agree with the prediction of the DGLAP evolution equations from which the colour factor ratio
is measured to be:
Received: 5 November 1999 / Published online: 25 February 2000 相似文献
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K. Prytz 《The European Physical Journal C - Particles and Fields》2001,22(2):317-321
The notion of a pomeron structure function arises in a model of electromagnetic diffractive scattering based on Regge factorization.
Due to its small size we expect gluon recombination to occur significantly in the pomeron. The latest data from H1 (1999)
show a evolution in qualitative accordance with the GLR-MQ equations; these are the DGLAP (Altarelli–Parisi) equations corrected
for the effect of gluon recombination.
Received: 9 October 2000 / Revised version: 25 July 2001 / Published online: 5 November 2001 相似文献
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We construct the effective Hamiltonian which governs the renormalization group flow of the gluon distribution with increasing energy and in the leading logarithmic approximation. This Hamiltonian defines a two-dimensional field theory which involves two types of Wilson lines: longitudinal Wilson lines which describe gluon recombination (or merging) and temporal Wilson lines which account for gluon bremsstrahlung (or splitting). The Hamiltonian is self-dual, i.e., it is invariant under the exchange of the two types of Wilson lines. In the high density regime where one can neglect gluon number fluctuations, the general Hamiltonian reduces to that for the JIMWLK evolution. In the dilute regime where gluon recombination becomes unimportant, it reduces to the dual partner of the JIMWLK Hamiltonian, which describes bremsstrahlung. 相似文献
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In this paper, t and x-evolutions of gluon distribution function from Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) evolution equation in leading
order (LO) at low-x are presented assuming the Regge behaviour of quarks and gluons at this limit. We compare our results of gluon distribution
function with MRST 2001, MRST 2004 and GRV 1998 parametrizations and show the compatibility of Regge behaviour of quark and
gluon distribution functions with perturbative quantum chromodynamics (PQCD) at low-x. We also discuss the limitations of Taylor series expansion method used earlier to solve DGLAP evolution equations in the
Regge behaviour of distribution functions.
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《Nuclear Physics B》2007,760(1-2):128-144
A unitarized BFKL equation incorporating shadowing and antishadowing corrections of the gluon recombination is proposed. This equation reduces to the Balitsky–Kovchegov evolution equation near the saturation limit. We find that the antishadowing effects have a sizable influence on the gluon distribution function in the preasymptotic regime. 相似文献
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Evolution of gluon distribution function from Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) evolution equation in next-to-leading
order (NLO) at low-x is presented assuming the Regge behaviour of quark and gluon at this limit. We compare our results of gluon distribution
function with MRST2004, GRV98LO and GRV98NLO parametrizations and show the compatibility of Regge behaviour of quark and gluon
distribution functions with perturbative quantum chromodynamics (PQCD) at low-x.
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Evolution of gluon structure function from Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) evolution equations upto next-to-leading
order at low-x is presented assuming the Regge behaviour of structure functions. We compare our results of gluon structure function with
GRV 98 global parameterization and show the compatibility of Regge behaviour of structure functions with PQCD. 相似文献