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Factorization theorem relating Euclidean and light-cone parton distributions

机译:关于欧几里得和光锥parton分布的因式分解定理

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In a large-momentum nucleon state, the matrix element of a gauge-invariant Euclidean Wilson line operator accessible from lattice QCD can be related to the standard light-cone parton distribution function through the large-momentum effective theory (LaMET) expansion. This relation is given by a factorization formula with a nontrivial matching coefficient. Using the operator product expansion we derive the large-momentum factorization of the quasiparton distribution function in LaMET, and show that the more recently discussed pseudoparton distribution approach also obeys an equivalent factorization formula. Explicit results for the coefficients are obtained and compared at one loop. We also prove that the matching coefficients in the MS ˉ scheme depend on the large partonic momentum rather than the nucleon momentum.
机译:在大动量核子态下,可通过大动量有效理论(LaMET)展开将可从晶格QCD访问的轨距不变的欧几里德威尔逊线算子的矩阵元素与标准的光锥parton分布函数相关。该关系由具有非平凡匹配系数的分解公式给出。使用算子乘积展开,我们推导了LaMET中准parton分布函数的大动量分解,并表明最近讨论的伪parton分布方法也服从等效分解公式。获得系数的明确结果,并在一个循环中进行比较。我们还证明了MSˉ方案中的匹配系数取决于大的部分动量而不是核子动量。

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