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Deciphering the long-distance penguin contribution to B → γγ decays

Aug 10, 2022, 10:05 AM
Oral report 强子物理与味物理 Parallel Session III (2):Hadron and Flavor Physics


Dr Qin Qin (华中科技大学(HUST))


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 $B_{d, \, s} \to \gamma \gamma$ to become new benchmark probes of physics beyond the Standard Model.

Primary author

Dr Qin Qin (华中科技大学(HUST))

Presentation materials