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arXiv 1210.6136hep-ph
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核子中的奇异和非奇异海夸克-胶子效应

Strange and nonstrange sea quark-gluon effects in nucleons

M. Batra, A. Upadhyay

摘要:

计算了具有奇异和非奇异夸克胶子海含量的各种Fock态的几率,以探讨强子结构。特别是对于核子,我们发现除了三个价夸克外,标量、矢量和张量海对低能性质的贡献也是多种多样的。通过将奇异和非奇异夸克胶子含量引入强子海,讨论了单个海对核子低能参数的贡献。我们确认扩展的Fock空间波函数能够解释实验结果,其中矢量海在研究强子结构中起着至关重要的作用,而标量和张量海由于夸克自旋翻转过程而显得不那么占主导地位,但不能被忽略。一些性质,如自旋分布和gA/gV比似乎是最受影响的统计确定的系数的变化。详细分析包括统计方法中的不同近似值,以测试所选模型的有效性。文中还讨论了这种海对这些性质的影响,并与实验结果进行了比较。

英文摘要:

Probabilities of various Fock states with strange and nonstrange quark-gluon sea contents are calculated to probe the hadronic structure. Particularly for nucleon, we find various contributions to the low energy properties from scalar, vector and tensor sea in addition to three valence quarks. We focus on the importance of individual sea contributions to the low energy parameters of nucleon by taking the strange and non strange quark-gluon content to the hadron sea. We confirm that the extended Fock space wavefunction is capable of explaining the experimental results where vector sea plays a crucial role in studying hadronic structure while scalar and tensor sea appears to be less dominating due to quark-spin flip process but cannot be neglected. Some of the properties like spin distribution and gA/gV ratio seem to be the most affected by the change in the statistically determined coefficients. Detailed analysis includes different approximations within the statistical approach to test the validity of the model chosen. Phenomenological implication of such sea affecting these properties is also discussed and the results are compared with the experiments.

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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