Dipenguin-like contributions to D0 - anti-D0 mixing
Abstract
We show that because of the milder GIM suppression, the four-quark dipenguin operator contributes to the short distance piece of the D0- D0 mixing amplitude at the same order of magnitude as the box diagram. In addition, we put an upper bound mDLDR ≤ 5 × mDbox on a long-distance resonant contribution induced by the penguin mixing.
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