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arXiv 0806.4957hep-ph
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光锥分布振幅中的主导SU(3)断裂

Leading SU(3) breaking in lightcone distribution amplitudes

Chul Kim, Adam K. Leibovich

摘要:

利用软共线有效理论(SCET)研究了包含SU(3)破缺效应的轻赝标介子的光锥形式,其中展开所需的共形对称性可以清楚地实现.光锥分布振幅(LCDAs)在SCET功率计数λ中的每个阶都有明确的定义。使用SCET形式主义的LCDAs之间的关系再现。用微扰的方法处理SU(3)破缺,可以用简单的方式描述主导破缺效应。结果,建立了轻介子π、K和η的LCDA之间的新关系,该关系适用于SU(3)破缺的主导阶。

英文摘要:

The lightcone formalism including SU(3) breaking effects for the light pseudoscalar mesons is studied using soft-collinear effective theory (SCET), where the conformal symmetries needed for the expansion can be clearly implemented. The lightcone distribution amplitudes (LCDAs) are well-defined at each order in the SCET power counting, lambda. Relations between the LCDAs are reproduced using the SCET formalism. Treating the SU(3) breaking perturbatively, the leading breaking effects can be described in a simple manner. As a result, a new relationship among the LCDAs for the light mesons pi, K, and eta is developed, valid to leading order in the SU(3) breaking.

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