Combined Belle and Belle II dataset yields S = 0.09 ± 0.16 ± 0.02 and C = -0.09 ± 0.08 ± 0.04 in the K*0 region and S = -0.32 ± 0.33 ± 0.09 and C = -0.07 ± 0.17 ± 0.08 outside it for B0 → Ks0 π0 γ, more precise than prior results.
Direct CP Violation in B -> X_s gamma Decays as a Signature of New Physics
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abstract
We argue that the observation of a sizable direct CP asymmetry A_{CP} in the inclusive decays B -> X_s gamma would be a clean signal of New Physics. In the Standard Model, A_{CP} can be calculated reliably and is found to be below 1% in magnitude. In extensions of the Standard Model with new CP-violating couplings, large CP asymmetries are possible without conflicting with the experimental value of the branching ratio for the decays B -> X_s gamma. In particular, large asymmetries arise naturally in models with enhanced chromo-magnetic dipole operators. Some generic examples of such models are explored and their implications for the semileptonic branching ratio and charm yield in B decays discussed.
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hep-ex 1years
2026 1verdicts
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Measurement of time-dependent $CP$ violation parameters in $B^{0} \to K_{S}^{0} \pi^{0} \gamma$ decays at Belle and Belle II
Combined Belle and Belle II dataset yields S = 0.09 ± 0.16 ± 0.02 and C = -0.09 ± 0.08 ± 0.04 in the K*0 region and S = -0.32 ± 0.33 ± 0.09 and C = -0.07 ± 0.17 ± 0.08 outside it for B0 → Ks0 π0 γ, more precise than prior results.