Study of e+e−→Σ0Σ¯0 and Σ+Σ¯− by initial state radiation method at Belle
                        
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            We report the results of the first search for decays to the final state using of data collected at the resonance with the Belle detector at the KEKB asymmetric-energy collider. The results are interpreted in terms of both direct baryon-number-violating decay and oscillations which follow the standard model decay . We observe no evidence for baryon number violation and set the 95% confidence-level upper limits on the ratio of baryon-number-violating and standard model branching fractions to be and on the effective angular frequency of mixing in oscillations to be (equivalent to ). Published by the American Physical Society2024more » « less
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