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arXiv 1012.0215hep-lathep-phnucl-th
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格点量子色动力学中部分子分布函数的电荷对称破缺

Charge Symmetry Breaking in Parton Distribution Functions from Lattice QCD

R. Horsley, Y. Nakamura, D. Pleiter, P. E. L. Rakow, G. Schierholz, H. Stüben, A. W. Thomas, F. Winter, R. D. Young, J. M. Zanotti

摘要:

通过N_f=2+1格子模拟计算八重态重子的夸克动量分数,我们可以预测核子的部分子分布函数中电荷对称性破坏的程度。这是很重要的,不仅作为我们理解质子的非微扰结构的一个探测器,而且因为这样的违反限制了整体拟合部分子分布函数的准确性,从而限制了例如LHC的截面的预测精度。在对称性被用来指导对标准模型之外的物理学的研究的情况下,违反电荷对称性也可能是至关重要的。

英文摘要:

By determining the quark momentum fractions of the octet baryons from N_f=2+1 lattice simulations, we are able to predict the degree of charge symmetry violation in the parton distribution functions of the nucleon. This is of importance, not only as a probe of our understanding of the non-perturbative structure of the proton but also because such a violation constrains the accuracy of global fits to parton distribution functions and hence the accuracy with which, for example, cross sections at the LHC can be predicted. A violation of charge symmetry may also be critical in cases where symmetries are used to guide the search for physics beyond the Standard 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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