论文标题
解密长途企鹅对$ \ bar b_ {d，s} \toγγ$衰减的贡献
Deciphering the long-distance penguin contribution to $\bar B_{d, s} \to γγ$ decays
论文作者
论文摘要
我们首次计算长距离企鹅对双辐射$ b $ b $ -seson衰变的贡献，这是因为纯粹的耐药操作员通过引入一个新颖的subleading $ b $ b $ - $ -Meson分发剂，从第一场现场理论原理中与电磁电流作用。由于短距离硬线性函数的特殊分析行为，在光上空循环中的软闪光辐射而不是对应的魅力环路效应。重要的是，长距离上夸克企鹅的贡献带来了具有相同乘法CKM参数的已知可分解功率校正的实质性取消，从而使$ b_ {d，\ \，\，s} \ toγγ$成为超出标准模型的新基准测试量。
We compute for the first time the long-distance penguin contribution to the double radiative $B$-meson decays due to the purely hadronic operators acting with the electromagnetic current in the background soft-gluon field from first field-theoretical principles by introducing a novel subleading $B$-meson distribution amplitude. The numerically dominant penguin amplitude arises from the soft-gluon radiation off the light up-quark loop rather than the counterpart charm-loop effect on account of the peculiar analytical behaviour of the short-distance hard-collinear function. Importantly the long-distance up-quark penguin contribution brings about the substantial cancellation of the known factorizable power correction possessing the same multiplication CKM parameters, thus enabling $B_{d, \, s} \to γγ$ to become new benchmark probes of physics beyond the Standard Model.
