X（4260）信号中的干扰效应
Interference effects in the X(4260) signal
摘要：
我们发现，在电子正电子湮没的开放魅力衰变的长期已知的令人困惑的分支比可以合理地描述一个简单的形状因子，强烈抑制开放通道远高于阈值。应用于电子正电子湮没到J/psi+pion+pion数据的X（4260）增强最近由BABAR合作报告[arxiv：0808.1543]允许一个很好的拟合与一个简单的非共振尖点结构周围的D（*）（s）+Dbar（*）（s）阈值。此外，我们认为，仔细观察数据揭示了振荡模式，我们将其建模为快速OZI允许和慢速OZI禁止- J/psi+f（0）（980）模式之间的干扰效应。类似的非共振增强的其他候选人进行了讨论。
英文摘要：
We show that the long known puzzling branching ratios of open-charm decays in electron-positron annihilation can be reasonably described with a simple form factor, which strongly suppresses open channels far above threshold. Application to the electron-positron annihilation into J/psi+pion+pion data on the X(4260) enhancement recently reported by the BABAR Collaboration [arxiv:0808.1543] allows a good fit with a simple nonresonant cusp structure around the D(*)(s)+Dbar(*)(s) threshold. Moreover, we argue that a closer look at the data reveals an oscillatory pattern, which we model as an interference effect between a fast - OZI-allowed - and a slow - OZI-forbidden - J/psi+f(0)(980) mode. Other candidates for similar nonresonant enhancements are discussed.
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