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Institute of High Energy Physics, Beijing 100049, People's Republic of China.
Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia.
Phys Rev Lett. 2023 Sep 22;131(12):121801. doi: 10.1103/PhysRevLett.131.121801.
We report on the first search for Λ[over ¯]-Λ oscillations in the decay J/ψ→pK^{-}Λ[over ¯]+c.c. by analyzing 1.31×10^{9} J/ψ events accumulated with the BESIII detector at the BEPCII collider. The J/ψ 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 Λ[over ¯] to Λ hyperons is determined to be P(Λ)=[B(J/ψ→pK^{-}Λ+c.c.)/B(J/ψ→pK^{-}Λ[over ¯]+c.c.)]<4.4×10^{-6} corresponding to an oscillation parameter δm_{ΛΛ[over ¯]} of less than 3.8×10^{-18} GeV at the 90% confidence level.
我们报告了首次通过分析在北京正负电子对撞机Ⅱ（BEPCII）上利用北京谱仪Ⅲ（BESIII）探测器积累的1.31×10⁹个J/ψ事例，在衰变J/ψ→pK⁻Λ̅+c.c.中寻找Λ̅-Λ振荡。J/ψ事例是在质心能量√s = 3.097 GeV下通过e⁺e⁻对撞产生的。未观察到超子振荡的证据。Λ̅到Λ超子的振荡率上限确定为P(Λ)=[B(J/ψ→pK⁻Λ+c.c.)/B(J/ψ→pK⁻Λ̅+c.c.)]<4.4×10⁻⁶，对应于在90%置信水平下振荡参数δmΛΛ̅小于3.8×10⁻¹⁸ GeV。
