论文标题
右撇子当前对$ \ bar {b} \ tox_ulν$衰变的贡献是否由QCD中的非平凡真空纠正？
Is right-handed current contribution to $\bar{B}\to X_ulν$ decays corrected by non-trivial vacuum in QCD?
论文作者
论文摘要
我们研究违反Quark-Hadron二重性的$ \ bar {b} \ tox_ulν$和$ d \ to $ d \ tox_dlν$在右手当前运算符的存在下衰减。在这种情况下，我们表明违规二元性与由于存在Instanton而有一些方面不同于标准模型。特别是，中间光夸克的费米子零模式可能会因其手性结构而产生不利的贡献。然后将来自单个插入的双重性侵入分量分析作为有限距离奇异性，从而导致对Minkowski空间中可观察到的振荡校正。最后，我们表明，在$ \ bar {b} $衰减中对Lepton能量分布的二元性违规大小可以与手性抑制的扰动贡献相媲美，尽管绝对大小取决于QCD真空的细节。
We study violation of quark-hadron duality for $\bar{B}\to X_ulν$ and $D\to X_dlν$ decays in the presence of the right-handed current operator. For this case, we show that duality violation has some aspects different from the standard model due to the existence of an instanton. In particular, the fermionic zero mode of an intermediate light quark can give a nonvanishing contribution owing to its chirality structure. A duality-violating component that arises from a single instanton is then analytically extracted as a finite-distance singularity, leading to an oscillatory correction to the observable in Minkowski space. Finally, we show that the size of duality violation for the lepton energy distribution in $\bar{B}$ decays can be comparable to the chirally suppressed perturbative contribution although the absolute size depends on the detail of the QCD vacuum.
