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- W3136875416 abstract "The observed matter-antimatter asymmetry in the universe composes a serious challenge to our understanding of nature. BNV/LNV decay has been searched in many experiments to understand this large-scale observed fact. In the case of $e^+e^-$ collision, few experiments are performed. Here we proposed to search BNV and LNV with currently the world largest J/psi data sets in e+e- collision experiment. The BNV and LNV channel $J/psitoLambda_c^+e^-+c.c.$ is searched, and no signal event is observed. The upper limit of the branching fraction is set to be $6.9times10^{-8}$ at $90%$ Confidence Level, which is still much higher than the estimation based on SM. For the process with $Delta B=2$, a search for $Lambda$-$barLambda$ oscillation is performed for the first time. No evidence of the baryon oscillation is observed, the upper limit for the rate of $barLambda$ oscillates to $Lambda$ is determined as $mathcal{P}(Lambda)=frac{mathcal{B}(J/psito pK^-Lambda+c.c.)} {mathcal{B}(J/psito pK^-barLambda+c.c.)}<4.4times10^{-6}$, and the oscillation parameter $delta m_{LambdabarLambda}$ is calculated to be less than $3.8times10^{-15}$ MeV at 90% confidence level." @default.
- W3136875416 created "2021-03-29" @default.
- W3136875416 creator A5091164680 @default.
- W3136875416 date "2021-02-02" @default.
- W3136875416 modified "2023-10-07" @default.
- W3136875416 title "BNV/LNV searches in charmonium decays at BESIII" @default.
- W3136875416 doi "https://doi.org/10.22323/1.390.0294" @default.
- W3136875416 hasPublicationYear "2021" @default.
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