arXiv 2102.013142021-02hep-ex

用初态辐射研究质心能从阈能到4.5 GeV的反应$e^+e^-\to2(π^+π^-)π^0π^0π^0$和$e^+e^-\to2(π^+π^-)π^0π^0η$

Study of the reactions $e^+e^-\to2(π^+π^-)π^0π^0π^0$ and $e^+e^-\to2(π^+π^-)π^0π^0η$ at center-of-mass energies from threshold to 4.5 GeV using initial-state radiation

The BABAR Collaboration

备注：: 22 pages, 31 pdf figures, submitted to PRD
发表信息：: Phys. Rev. D 103, 092001 (2021)
DOI：: 10.1103/PhysRevD.103.092001

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摘要：

我们研究了高能光子从初始态辐射的过程$e^+e^-\to 2(π^+π^-)π^0π^0π^0γ$和$2(π^+π^-)π^0π^0ηγ$。在SLAC使用\babar ~检测器收集数据。从对应于469 fb^{-1}的积分光度的数据样本中分别选择了大约14，000和4700个事件。强子末态的不变质量定义了有效的\epem质心能量。的质心能量范围从阈值到4.5 GeV。根据质谱，进行了$e^+e^-\to 2(π^+π^-)π^0π^0π^0$和$e^+e^-\to2(π^+π^-)π^0π^0η$横截面的首次测量。从$ωπ^+π^-π^0π^0$，$\eta2(π^+π^-)$，和其他中间状态的贡献。我们观察到的$J/ψ$和$ψ(2S)$在大多数这些最终状态，并测量相应的分支分数，其中许多是第一次。

英文摘要：

We study the processes $e^+e^-\to 2(π^+π^-)π^0π^0π^0γ$ and $2(π^+π^-)π^0π^0ηγ$ in which an energetic photon is radiated from the initial state. The data were collected with the \babar~ detector at SLAC. About 14\,000 and 4700 events, respectively, are selected from a data sample corresponding to an integrated luminosity of 469 fb^{-1}. The invariant mass of the hadronic final state defines the effective \epem center-of-mass energy. The center-of-mass energies range from threshold to 4.5 GeV. From the mass spectra, the first ever measurements of the $e^+e^-\to 2(π^+π^-)π^0π^0π^0$ and the $e^+e^-\to2(π^+π^-)π^0π^0η$ cross sections are performed. The contributions from $ωπ^+π^-π^0π^0$, $\eta2(π^+π^-)$, and other intermediate states are presented. We observe the $J/ψ$ and $ψ(2S)$ in most of these final states and measure the corresponding branching fractions, many of them for the first time.

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