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Search for direct production of the f 1(1285) resonance in e + e ? collisions

机译:搜索 f 1 (1285)在 e + e 碰撞

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A search for direct production of thef1(1285)resonance ine+e?annihilation is performed with the SND detector at the VEPP-2000e+e?collider. The analysis is based on data with an integrated luminosity of 15.1 pb?1accumulated in the center-of-mass energy range 1.2–1.4 GeV. Twoe+e?→f1(1285)candidate events are found at the peak of the resonance and zero events beyond the resonance. The significance of thee+e?→f1(1285)signal is 2.5σ. The cross section at the maximum of the resonance is found to beσ(e+e?→f1)=45?24+33pb. The corresponding branching fractionB(f1(1285)→e+e?)=(5.1?2.7+3.7)×10?9. We consider this result as a first indication of the processe+e?→f1(1285). The measured branching fraction is consistent with the theoretical prediction.
机译:使用VEPP-2000e + e?对撞机上的SND检测器进行f1(1285)共振ine + e an灭的直接搜索。该分析基于在质量中心能量范围1.2–1.4 GeV中累积的15.1 pb?1的综合亮度的数据。在谐振的峰值处发现了Twoe + e?→f1(1285)候选事件,在谐振的峰值处发现了零个事件。 e + e?→f1(1285)信号的有效值为2.5σ。发现共振最大处的横截面为σ(e +e≥f1)=45≤24+ 33pb。相应的分支分数B(f1(1285)→e + e?)=(5.1→2.7 + 3.7)×10→9。我们认为该结果是过程+ e→→f1(1285)的第一个指示。测得的分支分数与理论预测一致。

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