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Enhancement of charm CP violation due to nearby resonances

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arxiv 2110.07619 v2 pith:TIANNPBT submitted 2021-10-14 hep-ph hep-ex

Stefan Schacht , Amarjit Soni This is my paper · ORCID
classification hep-phhep-ex
keywords violationresonancescalculationscharmlhcbmodelnearbyphysics
verification ladder T0 review T1 audit T2 compute T3 formal

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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.

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Forward citations

Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Search for $CP$ violation in $\Xi_c^+\to\Sigma^+h^+h^-$ and $\Lambda_c^+\to ph^+h^-$ at Belle II

    hep-ex 2025-09 accept novelty 8.0 of 10

    First individual A_CP measurements for Xi_c+ -> Sigma+ h+h- and Lambda_c+ -> p h+h- decays, all consistent with CP symmetry and with U-spin sum-rule predictions.

  2. Measurement of the CP asymmetry in $D^+ \to \pi^+ \pi^0$ decays at Belle II

    hep-ex 2025-06 accept novelty 5.0 of 10

    The new world-best measurement of the CP asymmetry in D+ -> pi+ pi0 decays is (-1.8 +/- 0.9 +/- 0.1)%, consistent with zero and with the Standard Model.

  3. Measurement of the time-integrated $CP$ asymmetry in $D^0\to\pi^0\pi^0$ decays at Belle II

    hep-ex 2025-05 accept novelty 5.0 of 10

    Belle II measures A_CP(D0 -> pi0 pi0) = (0.30 ± 0.72 ± 0.20)%, consistent with no CP violation and with the previous Belle measurement.

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