论文标题
搜索$υ(1s,2s)$包含$υ(1s,2s)的双重收费$ ddk $ bound state,并通过$ e^+e^ - $ collisions in $ \ sqrt {s} $ = 10.520,10.580和10.867 GEV进行直接生产。
Search for a doubly-charged $DDK$ bound state in $Υ(1S,2S)$ inclusive decays and via direct production in $e^+e^-$ collisions at $\sqrt{s}$ = 10.520, 10.580, and 10.867 GeV
论文作者
论文摘要
我们报告了第一次搜索双重充电的$ ddk $绑定状态的结果,表示$ r^{++} $,以$υ(1s)$和$υ(2S)$包含衰变,并通过$ E^+E^+E^ - $ collisions $ \ sqrt {s} $ \ sqrt {s} $ = 10.520,10.520,10.520,10.520,10.520,10.520,10.520,10.520,10.520,10.520,10.520,10.520,10.520,10.520,10.520,10.520,10.520,10.520,10.520,10.520,10.520,10.520,10.866,86。该搜索使用KEKB非对称能量$ E^+E^ - $ collider上Belle检测器累积的数据。在所有研究模式的$ d^{+} d_ {s}^{*+} $不变质量光谱中,未观察到明显的信号。其产品分支分支的90 \%可信度水平上限为$υ(1s)$和$购(2s)$包含性衰减($ {\ cal b}(υ(1s,2s)\ to r^{++}+r^{++}+任何东西) d_ {s}^{*+})$),以及出生的横截面和分支分支的产品值($ e^+e^ - $ collisions($σ(e^+e^ - \ to r^{++}+nothing) $ \ sqrt {s} $ = 10.520、10.580和10.867 GEV在$ r^{++} $的不同假设下,从4.13到4.17 GEV/$ C^2 $不等,并且获得了从0到5 meV的宽度。
We report the results of a first search for a doubly-charged $DDK$ bound state, denoted the $R^{++}$, in $Υ(1S)$ and $Υ(2S)$ inclusive decays and via direct production in $e^+e^-$ collisions at $\sqrt{s}$ = 10.520, 10.580, and 10.867 GeV. The search uses data accumulated with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. No significant signals are observed in the $D^{+}D_{s}^{*+}$ invariant-mass spectra of all studied modes. The 90\% credibility level upper limits on their product branching fractions in $Υ(1S)$ and $Υ(2S)$ inclusive decays (${\cal B}(Υ(1S,2S) \to R^{++} + anything) \times {\cal B}(R^{++} \to D^{+} D_{s}^{*+})$), and the product values of Born cross section and branching fraction in $e^+e^-$ collisions ($σ(e^+e^- \to R^{++} + anything) \times {\cal B}(R^{++} \to D^{+} D_{s}^{*+})$) at $\sqrt{s}$ = 10.520, 10.580, and 10.867 GeV under different assumptions of $R^{++}$ masses varying from 4.13 to 4.17 GeV/$c^2$, and widths varying from 0 to 5 MeV are obtained.