The $c \to u γ$ Contribution to Weak Radiative Charm Decay

Details The $c \to u γ$ Contribution to Weak Radiative Charm Decay The $c \to u γ$ Contribution to Weak Radiative Charm Decay

1996-03-26

arxiv.org/abs/hep-ph/9603417v2

Phys.Lett.B382:415-420,1996

Physics

High Energy Physics

High Energy Physics - Phenomenology

Mistake in the negligible one-loop contribution corrected

Scientific paper

10.1016/0370-2693(96)00694-6

The $c \to u \gamma$ transition does not occur at the tree level in the Standard Model and is strongly GIM-suppressed at one loop. The leading QCD logarithms are known to enhance the amplitude by two orders of magnitude. We point out that the amplitude increases further by two orders of magnitude after including the complete 2-loop QCD contributions. Nevertheless, $\Delta S =0$ radiative decays of charmed hadrons remain dominated by the $c \to d \bar{d} u \gamma$ and $c \to s \bar{s} u \gamma$ quark subprocesses.

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