Belle实验?(5S)数据中新类底偶素态的寻找
Search for new bottomonium-like state in Belle?(5S) data
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摘要: Belle实验组利用在?(5S)共振峰上采集的大数据样本,对e+e-→π+π-?(nS)和π+π-hb (mP)(n=1,2,3,m=1,2)过程进行了研究,在π±?(nS)和π±hb(mP)的系统中,同时观测到了两个新的带电类底偶素结构——Zb(10610)和Zb(10650)。它们衰变到底偶素末态,同时还带有电荷,所以它们的组成成份中至少含有4个夸克。最近,对e+e-→π+π-π0γ?(1S)过程也进行了研究,在ω?(1S)系统中对类X(3872)的底偶素态Xb进行了寻找。Abstract: Using data samples collected with the Belle detector at the ?(5S) resonance, the e+e-→π+π-?(nS) and π+π-hb(mP) (n=1, 2, 3, m=1, 2) processes were investigated. Two charged bottomonium-like states Zb(10610) and Zb(10650) were observed in theπ±?(nS) andπ±hb (mP) invariant mass distributions. Since they decay into bottomonium states and are charged, they must have at least four quarks in their composition. Very recently, e+e-→π+π-π0γ?(1S) was also studied, and a search for the X(3872)-like state, Xb , was performed in the bottom sector.
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