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发现ZC(3900)——一个带电类粲偶素共振结构

Observation of a charged charmonium-like state ZC(3900)

  • 摘要: 北京谱仪(BESⅢ)实验和Belle实验利用两种不同的方法对e+e-→ p+p-J/y过程进行了研究。在p±J/y系统中,同时观测到了一个新的带电类粲偶素结构——ZC(3900)。ZC(3900)耦合到粲偶素末态,因此其内部夸克组分应该含有正反粲夸克;同时它还带有电荷,故不可能仅由正反粲夸克组成。ZC(3900)共振态中最少含有4个夸克,极有可能是一个奇特态强子。

     

    Abstract: Using data samples collected with the BESIII detector at an e+e- centre-of-mass energy of 4.26 GeV and with the Belle detector on or near the (nS), n=1, …, 5, resonances, the e+e--→ p+p-J/y process was investigated through different approaches. Both detectors observed a charged charmonium-like state in the invariant mass distribution of p±J/y . This new structure, called ZC(3900),couples strongly to a charmonium and is charged, so it cannot be a conventional charmonium state, but can be interpreted as an exotic hadron with at least four quarks.

     

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