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New Physics and CP Violation in Singly Cabibbo Suppressed D Decays
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abstract
We analyze various theoretical aspects of CP violation in singly Cabibbo suppressed (SCS) D-meson decays, such as $D \to K K,\pi \pi$. In particular, we explore the possibility that CP asymmetries will be measured close to the present level of experimental sensitivity of $O(10^{-2})$. Such measurements would signal new physics. We make the following points: (i) The mechanism at work in neutral D decays could be indirect or direct CP violation (or both). (ii) One can experimentally distinguish between these possibilities. (iii) If the dominant CP violation is indirect, then there are clear predictions for other modes. (iv) Tree-level direct CP violation in various known models is constrained to be much smaller than $10^{-2}$. (v) SCS decays, unlike Cabibbo favored or doubly Cabibbo suppressed decays, are sensitive to new contributions from QCD penguin operators and especially from chromomagnetic dipole operators. This point is illustrated with supersymmetric gluino-squark loops, which can yield direct CP violating effects of $O(10^{-2})$.
Forward citations
Cited by 6 Pith papers
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Derives CP asymmetry formulas for D to KS,L P/V decays with mixing effects, fits hadronic parameters from branching fractions via topological diagrams, predicts O(10^{-3}) effects in several modes and reduces tension ...
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Long distance contributions to neutral $D$-meson mixing from lattice QCD
The authors propose and analyze a spectral-reconstruction method for lattice QCD that could determine the long-distance contributions to D0-Dbar0 mixing parameters x and y from first principles.
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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.
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Measurement of the time-integrated $CP$ asymmetry in $D^0\to\pi^0\pi^0$ decays at Belle II
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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CP violation studies at Super Tau-Charm Facility
A future Super Tau-Charm Facility is projected to test CP violation in hyperon, tau, and charm decays at 1e-4 to 1e-3 sensitivities and improve the kaon CPT mass-difference limit tenfold.
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