Search for $\bar{\Lambda }$-$\Lambda$ oscillations in the decay $J/\psi \to p{K}^{-}\bar{\Lambda }+c.c.$

Abstract

We report the first search for $\bar{\Lambda }$--$\Lambda$ oscillations in the decay $J/\psi \to p{K}^{-}\bar{\Lambda }+c.c.$ by analyzing $1.31\times 10^9$ $J/\psi$ events accumulated with the BESIII detector at the BEPCII collider. The $J/\psi$ events are produced using $e^{+}{e}^{-}$ collisions at a center of mass energy $\sqrt{s}=3.097$~GeV. No evidence for hyperon oscillations is observed. The upper limit for the oscillation rate of $\bar{\Lambda }$ to $\Lambda$ hyperons is determined to be $\mathcal{P}(\Lambda )=\frac{\mathcal{B}(J/\psi \to p{K}^{-}\Lambda +c.c.)}{\mathcal{B}(J/\psi \to p{K}^{-}\bar{\Lambda }+c.c.)}<4.4\times 10^{-6}$ corresponding to an oscillation parameter $\delta m_{\Lambda \bar{\Lambda }}$ of less than $3.8\times 10^{-18}$~GeV at the 90\% confidence level.

arXiv comment7 pages, 1 figure

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Cited by in corpus (1)

• Search for the baryon and lepton number violating decay $J/\psi \to p{e}^{-}$ + c.c