Do gluons carry half of the nucleon momentum?
Do gluons carry half of the nucleon momentum?
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DOI：
10.1103/physrevlett.103.062001
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发表时间：
2009-04
影响因子：
8.6
通讯作者：
Xiang-Song Chen;Wei-Min Sun;Xiao-fu Lü;Fan Wang;T. Goldman
中科院分区：
文献类型：
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作者：
Xiang-Song Chen;Wei-Min Sun;Xiao-fu Lü;Fan Wang;T. Goldman
我们研究了在渐近极限下胶子携带大约一半核子动量的传统图象。我们表明，这一大部分是由于一个不合适的定义胶子动量的相互作用理论。如果以规范不变和相容的方式定义，渐近胶子动量分数被计算为只有大约五分之一。这一结果表明，核子自旋结构的渐近极限也应该重新审查。一个可能的实验测试，我们的发现进行了讨论，在新的部分子分布函数。
We examine the conventional picture that gluons carry about half of the nucleon momentum in the asymptotic limit. We show that this large fraction is due to an unsuitable definition of the gluon momentum in an interacting theory. If defined in a gauge-invariant and consistent way, the asymptotic gluon momentum fraction is computed to be only about one-fifth. This result suggests that the asymptotic limit of the nucleon spin structure should also be reexamined. A possible experimental test of our finding is discussed in terms of novel parton distribution functions.