标题： 非微扰 O(m_c^{-2}) 效应在 B-> X_s 光子中来自重夸克有效理论 显示英文标题

标题： Nonperturbative O(m_c^{-2}) Effects in B-> X_s photon from Heavy Quark Effective Theory

摘要： 非微扰贡献在B介子的包括性衰变B -> X_s光子中被抑制，其抑制因子为奇夸克质量m_c的幂次。在重夸克有效场理论（HQEFT）的背景下对此进行了分析。根据之前的分析，O(1/m_c^2)的主导效应来源于一个外部胶子与奇夸克环的相互作用，并可以表示为B介子内部b夸克的色磁相互作用。在HQEFT方法中，这一情况同样适用于领先阶。然而，高维算符的结构不同，因为仅外部胶子的作用不能给出完整的算符集合。可以通过在HQEFT方案中使用算符乘积展开系统地推导出所有高维算符。 显示英文摘要

摘要： The nonperturbative contribution, suppressed by powers of the charm quark mass m_c, in the inclusive decay B -> X_s photon is analyzed in the context of heavy quark effective field theory (HQEFT). According to previous analyses, the leading effects of O(1/m_c^2) arise from an external gluon attached to a charm quark loop and can be expressed in terms of the chromomagnetic interaction of the b quark inside the B meson. This is also true at leading order in the HQEFT approach. However the structure of higher-dimensional operators is different because the effects of external gluons alone do not give a complete set of operators. A systematic method to derive all the high-dimensional operators can be obtained in the HQEFT scheme using the operator product expansion.