标题： SU(3) 对 B → D l ν 形因子在 O(1/M) 阶的修正 显示英文标题

标题： SU(3) Corrections to B -> D l nu Form Factors at O(1/M)

摘要： 我们计算了B_s → D_s e ν形式因子的O(1/M,m_s)重夸克和SU(3)修正。在轻夸克质量消失的极限下，B_s → D_s e ν形式因子用B → D e ν形式因子、领先阶的奇素参数g以及两个O(1/M)的奇素参数$g_1$和$g_2$来表示。所有奇素参数原则上都可以从其他重介子衰变中提取。为了完整性，给出了与奇异夸克质量成比例的解析抵消项，但当它们被包括在内时，不再具有预测能力。异常大的环状修正警告说，这些过程的重夸克奇素对称性展开的收敛性较差。这表明，依赖于重夸克和奇素对称性的B\to D形式因子的简单外推，如在格点QCD蒙特卡洛模拟中常用的方法，可能会产生较大的误差。 显示英文摘要

摘要： We compute the O(1/M,m_s) heavy quark and SU(3) corrections to B_s -> D_s e nu form factors. In the limit of vanishing light quark mass, B_s -> D_s e nu form factors are given in terms of the the B -> D e nu form factors, the leading order chiral parameter g, and two O(1/M) chiral parameters $g_1$ and $g_2$. All the chiral parameters can be extracted, in principle, from other heavy meson decays. Analytic counterterms proportional to the strange quark mass are presented for completeness, but no predictive power remains when they are included. Anomalously large loop corrections warn of poor convergence of the heavy quark chiral symmetry expansion for these processes. This suggests that naive extrapolations of B \to D form factors relying on heavy quark and chiral symmetries, as often used in monte carlo simulations of lattice QCD, may incur large errors.