O（beta_0 alpha_s^2）时Bbar -> X_sgamma的色磁偶极算符修正
Chromomagnetic Dipole-Operator Corrections in Bbar -> X_sgamma at O(beta_0 alpha_s^2)
摘要：
利用朴素非阿贝尔化方法计算了次次首阶色磁偶极算符Q_8的自干涉对Bbar → X_s γ光子能谱的费米子修正。对于1.6 GeV（1.0 GeV）的光子能量切割，对Bbar -> X_sgamma分支比的O（beta_0 alpha_s^2）修正相当于+0.12%（+0.27%）的相对位移。我们还讨论了与Q_8有关的重扰和非微扰效应的潜在大小。
英文摘要：
We calculate the fermionic corrections to the photon-energy spectrum of Bbar -> X_sgamma which arise from the self-interference of the chromomagnetic dipole operator Q_8 at next-to-next-to-leading order by applying naive non-abelianization. The resulting O(beta_0 alpha_s^2) correction to the Bbar -> X_sgamma branching ratio amounts to a relative shift of +0.12% (+0.27%) for a photon-energy cut of 1.6 GeV (1.0 GeV). We also comment on the potential size of resummation and non-perturbative effects related to Q_8.
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