The e+ e- -->3(pi+pi-), 2(pi+pi-pi0) and K+K- 2(pi+pi-) Cross Sections at Center-of-Mass Energies from Production Threshold to 4.5 GeV Measured with Initial-State Radiation
The e+ e- -->3(pi+pi-), 2(pi+pi-pi0) and K+K- 2(pi+pi-) Cross Sections at Center-of-Mass Energies from Production Threshold to 4.5 GeV Measured with Initial-State Radiation
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DOI：
10.1103/physrevd.73.052003
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发表时间：
2006-02
期刊：
影响因子：
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通讯作者：
The Babar Collaboration;B. Aubert;E. al.
中科院分区：
文献类型：
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作者：
The Babar Collaboration;B. Aubert;E. al.
研究了过程e+ e->3（pi+pi-）γ、2（pi+ pi-pi 0）γ和K+ K- 2（pi+pi-）γ，其中光子是从初态辐射的.从232 fb-1的BaBar数据中分别选择了大约20，000、33，000和4，000个完全重建的事件。强子末态的不变质量定义了有效的e+e-质心能量，因此这些数据可以与相应的直接e+e-测量进行比较。从3（pi+pi-）、2（pi+ pi-pi-0）和K+ K- 2（pi+pi-）质谱，测量了从产生阈到4.5GeV的质心能量范围内e+ e->3（pi+pi-）、e+ e->2（pi+ pi-pi-0）和e+ e->K+ K- 2（pi+pi-）过程的截面.横截面测量的不确定性通常为6- 15%。我们在所有这些最终状态下观察J/psi，并测量相应的分支分数。
We study the processes e+ e- -->3(pi+pi-)gamma, 2(pi+pi-pi0)gamma and K+ K- 2(pi+pi-)gamma, with the photon radiated from the initial state. About 20,000, 33,000 and 4,000 fully reconstructed events, respectively, have been selected from 232 fb-1 of BaBar data. The invariant mass of the hadronic final state defines the effective e+e- center-of-mass energy, so that these data can be compared with the corresponding direct e+e- measurements. From the 3(pi+pi-), 2(pi+pi-pi0) and K+ K- 2(pi+pi-) mass spectra, the cross sections for the processes e+ e- -->3(pi+pi-), e+ e- -->2(pi+pi-pi0) and e+ e- -->K+ K- 2(pi+pi-) are measured for center-of-mass energies from production threshold to 4.5 GeV. The uncertainty in the cross section measurement is typically 6-15%. We observe the J/psi in all these final states and measure the corresponding branching fractions.