Data-driven extraction of amplitudes in D to pi pi decays reveals a penguin term 4.74 times larger than the tree amplitude, inconsistent with SM estimates at >3.3 sigma and requiring new physics.
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Implications of the evidence for direct $\mathbf{CP}$ violation in $D\to \pi^+\pi^-$ decays
Data-driven extraction of amplitudes in D to pi pi decays reveals a penguin term 4.74 times larger than the tree amplitude, inconsistent with SM estimates at >3.3 sigma and requiring new physics.