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arXiv 1207.1808hep-phhep-th
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基于共形对称性的Bjorken和Ellis-Jaffe求和规则之间的关系

Conformal symmetry based relation between Bjorken and Ellis-Jaffe sum rules

A. L. Kataev

摘要:

在无质量U(1)理论的共形不变极限下,即在微扰猝灭QED模型下,以及在含费米子的无质量$SU(N_c)$规范理论的相同极限下,导出了Bjorken和Ellis-Jaffe求和规则的系数函数表达式之间的恒等式.本文的推导是基于在不违反共形对称性的情况下,比较应用算子乘积展开方法计算极限内单态轴矢-矢-矢费米子流和非单态轴矢-矢-矢费米子流的三角形缀饰格林函数的结果。给出了在$SU(N_c)$群的共形不变极限中导出的非单重态系数函数的$O(α_s^3)$近似表达式。它可能的应用在唯象分析的实验数据的Bjorken极化和规则的概述。

英文摘要:

The identity between expressions for the coefficient functions of the Bjorken and Ellis-Jaffe sum rules is derived in the conformal invariant limit of massless U(1) theory, namely in the perturbative quenched QED model, and in the same limit of the massless $SU(N_c)$ gauge theory with fermions. The derivation is based on the comparison of results of application of the operator product expansion approach to the dressed triangle Green functions of singlet Axial vector- Vector-Vector and non-singlet Axial vector-Vector-Vector fermion currents in the limit, when the conformal symmetry is not violated. The expressions for the $O(α_s^3)$ approximation of the non-singlet coefficient function, derived in the conformal invariant limit of $SU(N_c)$ group, is reminded. Its possible application in the phenomenological analysis of the experimental data for the Bjorken polarized sum rule is outlined.

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