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.
Implications on the first observation of charm CPV at LHCb
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abstract
Very recently, the LHCb Collaboration observed the $CP$ violation (CPV) in the charm sector for the first time, with $\Delta A_{CP}^{\rm dir}\equiv A_{CP}(D^0\to K^+K^-)-A_{CP}(D^0\to \pi^+\pi^-)=(-1.54\pm0.29)\times10^{-3}$. This result is consistent with our prediction of $\Delta A_{CP}^{\rm SM}=(-0.57\sim -1.87)\times 10^{-3}$ obtained in the factorization-assisted topological-amplitude (FAT) approach in [PRD86,036012(2012)]. It implies that the current understanding of the penguin dynamics in charm decays in the Standard Model is reasonable. Motivated by the success of the FAT approach, we further suggest to measure the $D^+\to K^+K^-\pi^+$ decay, which is the next potential mode to reveal the CPV of the same order as $10^{-3}$.
verdicts
UNVERDICTED 2representative citing papers
LHCb presents updated measurements of mixing and time-dependent CP violation in charm, including a new result for the parameter A_Γ from 2015-2016 data.
citing papers explorer
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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.
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Measurements of time-dependent $C\!P$ violation and mixing in charm at LHCb
LHCb presents updated measurements of mixing and time-dependent CP violation in charm, including a new result for the parameter A_Γ from 2015-2016 data.