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arXiv 1002.0893hep-ex
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$J/ψ\to K^{\pm} K_s π^{\mp} π^0$中带电κ的研究

A study of charged kappa in $J/ψ\to K^{\pm} K_s π^{\mp} π^0$

M. Ablikim

备注：
14 pages, 4 figures
发表信息：
Phys.Lett.B693:88-94,2010
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摘要：

利用北京谱仪Ⅱ收集的$58 \times 10^6 $ $J/ψ$事例，研究了$J/ψ\to K^{\pm} K_s π^{\mp} π^0$衰变。在对带电的$K^*(892)^{\pm}$反冲的不变质谱中，发现带电的$κ$粒子作为低质量增强。如果用一个定宽的Breit-Wigner函数来参数化kappa，其极点位于$(849 \pm 77 ^{+18}_{-14}) -i (256 \pm 40 ^{+46}_{-22})$ MeV/ $c^2$。同样在该通道中，首次观察到衰减$J/ψ\to K^*(892)^+ K^*(892)^-$。其分支比为$(1.00 \pm 0.19 ^{+0.11}_{-0.32}) \times 10^{-3}$。

英文摘要：

Based on $58 \times 10^6 $ $J/ψ$ events collected by BESII, the decay $J/ψ\to K^{\pm} K_s π^{\mp} π^0$ is studied. In the invariant mass spectrum recoiling against the charged $K^*(892)^{\pm}$, the charged $κ$ particle is found as a low mass enhancement. If a Breit-Wigner function of constant width is used to parameterize the kappa, its pole locates at $(849 \pm 77 ^{+18}_{-14}) -i (256 \pm 40 ^{+46}_{-22})$ MeV/$c^2$. Also in this channel, the decay $J/ψ\to K^*(892)^+ K^*(892)^-$ is observed for the first time. Its branching ratio is $(1.00 \pm 0.19 ^{+0.11}_{-0.32}) \times 10^{-3}$.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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