Enhancement of charm CP violation due to nearby resonances

Abstract

Quantitative understanding of CP violation is extremely important as naturalness reasoning strongly suggests that new physics should be accompanied by beyond the Standard Model CP-odd phases. In 2019 LHCb made the first $5\sigma$ discovery of CP violation in the charm system, leading to the new world average $\Delta a_{CP}^{\mathrm{dir}}=-0.00161\pm 0.00028$. While some calculations have found this observation as requiring new physics, we suggest that scalar resonances nearby to $m_{D^0}$, in particular, $f_0(1710)$ and/or $f_0(1790)$ cause enhancements for CP violation within the SM. Thereby, our calculations based on the Standard Model suggest compatibility with the LHCb observations for now. However, experimental information especially on $f_0(1790)$ is rather sparse limiting our accuracy and further data on these resonances is strongly advocated.

19 pages, 1 figure. Additional data for ACP(D0->K+K-) taken into account

References in corpus (12)

• New Physics and CP Violation in Singly Cabibbo Suppressed D Decays
• Charm Meson Decays
• Topological amplitudes in $D$ decays to two pseudoscalars: a global analysis with linear $SU(3{)}_F$ breaking
• Direct CP asymmetry in $D\to {\pi }^{-}{\pi }^{+}$ and $D\to K^{-}{K}^{+}$ in QCD-based approach
• On $SU(3{)}_F$ Breaking through Final State Interactions and CP Asymmetries in $D\to PP$ Decays
• Unparticles at heavy flavour scales: CP violating phenomena
• Direct CP violation in beauty and charm hadron decays
• Neutral $D\to K{K}^{\ast }$ decays as discovery channels for charm CP violation
• ${\epsilon }^{\prime }/\epsilon$ in the Standard Model at the Dawn of the 2020s
• $I=1/2$ $S$-wave and $P$-wave $K\pi$ scattering and the $\kappa$ and $K^{\ast }$ resonances from lattice QCD
• A Comprehensive Study of the Radiative Decays of $J/\psi$ and $\psi (2S)$ to Pseudoscalar Meson Pairs, and Search for Glueballs
• Search for CP violation in D^0 -> pi^0 pi^0 decays

Cited by in corpus (7)

• Measurement of the time-integrated $CP$ asymmetry in $D^0\to K^{-}{K}^{+}$ decays
• A $U$-Spin Anomaly in Charm CP Violation
• Enhanced charm CP asymmetries from final state interactions
• The Mathematical Structure of $U$-Spin Amplitude Sum Rules
• Evidence of $A_{CP}(D^0\to {\pi }^{+}{\pi }^{-})$ implies observable $CP$ violation in the $D^0\to {\pi }^0{\pi }^0$ decay
• Pursuit of new physics within the ${\Lambda }_c\to \Delta K$ decays
• QCD-based estimate of direct $CP$ asymmetry in charm decays