Volume 390 - 40th International Conference on High Energy physics (ICHEP2020) - Parallel: Beyond the Standard Model
BNV/LNV searches in charmonium decays at BESIII
M.G. Zhao* On behalf of the BESIII collaboration
*corresponding author
Full text: pdf
Pre-published on: February 02, 2021
Published on:
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 $J/\psi\to\Lambda_c^+e^-+c.c.$ is searched, and no signal event is observed. The upper limit of the branching fraction is set to be $6.9\times10^{-8}$ 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 $\Lambda$-$\bar\Lambda$ oscillation is performed for the first time. No evidence of the baryon oscillation is observed, the upper limit for the rate of $\bar\Lambda$ oscillates to $\Lambda$ is determined
as $\mathcal{P}(\Lambda)=\frac{\mathcal{B}(J/\psi\to pK^-\Lambda+c.c.)} {\mathcal{B}(J/\psi\to pK^-\bar\Lambda+c.c.)}<4.4\times10^{-6}$, and the oscillation parameter $\delta m_{\Lambda\bar\Lambda}$ is calculated to be less than $3.8\times10^{-15}$ MeV at 90\% confidence level.
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.