论文标题
$ x(3872)\ rightarrow j/ψπ^+π^ - $的证据
Evidence for $X(3872)\rightarrow J/ψπ^+π^-$ produced in single-tag two-photon interactions
论文作者
论文摘要
我们通过标记电子或最终状态的位置,探索高度虚拟光子区域,以两光量相互作用报告$ x(3872)$生产的第一个证据。搜索以$ e^+e^ - \ rightArrow e^+e^-j/ψπ^+π^ - $,使用825 fb $^{ - 1} $由Belle检测器在Kekb $ e^+e^+e^ - $ Collider上操作的数据收集的数据。我们观察到三个$ x(3872)$候选人,其预期背景为$ 0.11 \ pm 0.10 $事件,其意义为3.2 $σ$。我们获得了$ \tildeγ_{γγ} {\ cal b}(x(3872)\ rightArrow j/ψπ^+π^ - $)的估计值,假设$ c \ bar {c \ bar {c} $ - meson型号$ -q^2 $ $ -q^2 $ smost phot virt virt airt virt the nespariant virt the virt the virt the virt the $ c^2 $依赖性。没有$ x(3915)\ rightarrow j/ψπ^+π^ - $ $候选者。
We report the first evidence for $X(3872)$ production in two-photon interactions by tagging either the electron or the position in the final state, exploring the highly virtual photon region. The search is performed in $e^+e^- \rightarrow e^+e^-J/ψπ^+π^-$, using 825 fb$^{-1}$ of data collected by the Belle detector operated at the KEKB $e^+e^-$ collider. We observe three $X(3872)$ candidates with an expected background of $0.11\pm 0.10$ events, with a significance of 3.2$σ$. We obtain an estimated value for $\tildeΓ_{γγ}{\cal B}(X(3872)\rightarrow J/ψπ^+π^-$) assuming the $Q^2$ dependence predicted by a $c\bar{c}$ meson model, where $-Q^2$ is the invariant mass-squared of the virtual photon. No $X(3915)\rightarrow J/ψπ^+π^-$ candidates are found.