论文标题
近隔到领先的订单匹配美容的介子$ b_ {c} $和$ b^*_ {c} $ decay常数
Next-to-next-to-leading order matching of beauty-charmed meson $B_{c}$ and $B^*_{c}$ decay constants
论文作者
论文摘要
我们将伪苏斯卡尔和矢量美容的梅森斯$ b_ {c} $和$ b^*_ {c} $在非同性QCD QCD有效理论中介绍了仿生常数（NNLO）QCD QCD校正。显式NNLO计算证实了伪库级电流的$ b_c $衰减常数与axial-vector电流的$ b_c $衰减常数相同。 $ b^*_ {C} $ Meson的向量衰减常数的NNLO结果是新颖的。结合最新提取的非同性QCD QCD长距离矩阵元素的$ b_c $ Meson元素，我们给出了$ B_ {C} $和$ B^*_ {C} $ MESON的Leptonic衰减的分支比率。此外，在非依赖性QCD有效理论中改变风味的重夸克矢量电流的新型异常维度有助于研究两种不同的重夸克的阈值行为。
We present the next-to-next-to-leading order (NNLO) QCD corrections to the decay constants for both the pseudoscalar and vector beauty-charmed mesons $B_{c}$ and $B^*_{c}$ in nonrelativistic QCD effective theory. Explicit NNLO calculation verified that the $B_c$ decay constant from pseudoscalar current is identical with the $B_c$ decay constant from axial-vector current. The NNLO result for the vector decay constant of $B^*_{c}$ meson is novel. Combined with the latest extraction of nonrelativistic QCD long-distance matrix elements of $B_c$ meson, we give the branching ratios of leptonic decays of $B_{c}$ and $B^*_{c}$ mesons. In addition, the novel anomalous dimension for the flavor-changing heavy quark vector current in nonrelativistic QCD effective theory are helpful to investigate the threshold behaviours of two different heavy quarks.
