Observation of a narrow mass state decaying into Υ(1S)+γ in p̄p collisions at s = 1.96 TeV
Observation of a narrow mass state decaying into Υ(1S)+γ in p̄p collisions at s = 1.96 TeV
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DOI：
10.1063/1.4826819
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
A. Chandra
中科院分区：
文献类型：
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作者：
A. Chandra
我们观察到一个窄质量态衰变为Υ(1s)+γ，其中Υ(1s)介子通过衰变成一对相反带电的介子而被探测到，而光子则通过它转换成电子-正电子对来识别。这一观测的意义是5.6个标准差。态的质量以10.551±0.014(统计)±0.017(系统)为中心。Gev/c2，这与ATLAS合作最近观察到的状态一致。数据样本对应于用费米实验室Tevatron对撞机的D0探测器积累的S=1.96TeV的pp碰撞的1.3fb−1的积分光度。
We observe a narrow mass state decaying into Υ(1S)+γ, where the Υ(1S) meson is detected by its decay into a pair of oppositely charged muons, and the photon is identified through its conversion into an electron-positron pair. The significance of this observation is 5.6 standard deviations. The mass of the state is centered at 10.551±0.014(stat.)±0.017(syst.) GeV/c2, which is consistent with that of the state recently observed by the ATLAS Collaboration. The data sample corresponds to an integrated luminosity of 1.3 fb−1 of pp collisions at s = 1.96 TeV accumulated with the D0 detector at the Fermilab Tevatron collider.