Search for hyperon $\Delta S=\Delta Q$ violating decay ${\Xi }^0\to {\Sigma }^{-}{e}^{+}{\nu }_e$

Abstract

Using a data sample of $(1.0087\pm 0.0044)\times 10^{10}$ $J/\psi$ decay events collected with the BESIII detector at the center-of-mass energy of $\sqrt{s}=3.097$ GeV, we present a search for the hyperon semileptonic decay ${\Xi }^0\to {\Sigma }^{-}{e}^{+}{\nu }_e$ which violates the $\Delta S=\Delta Q$ rule. No significant signal is observed, and the upper limit on the branching fraction $\mathcal{B}({\Xi }^0\to {\Sigma }^{-}{e}^{+}{\nu }_e)$ is determined to be $1.6\times 10^{-4}$ at the 90% confidence level. This result improves the previous upper limit result by about one order of magnitude.

arXiv comment9 pages, 4 figures

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