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arXiv 0807.0494hep-ex
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$e^+e^- \to {\rm Hadrons}$在3.650 ~ 3.872 GeV质心能区截面的反常线形

Anomalous Line-Shape of Cross Sections for $e^+e^- \to {\rm Hadrons}$ in the Center-of-Mass Energy Region between 3.650 and 3.872 GeV

BES Collaboration

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6 pages, 3figures
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摘要：

从BEPC对撞机上BES-Ⅱ探测器获得的$e^+e^- \to {\rm hadrons}$总截面数据中，我们观察到在3.700 - 3.872 GeV能区有明显的异常线形。对数据的重新分析表明，这与仅一个简单的$ψ(3770)$共振的解释不一致，其统计学显著性为$7σ$。这种异常的线形可以用两种可能的增强来解释，即在质心能量为3.764 GeV和3.779 GeV附近的包容性强子产生，表明除了3.773 GeV附近的$ψ(3770)$共振之外，可能还有一种新的结构，或者有一些物理效应反映了$D\bar D$产生动力学。

英文摘要：

We observe an obvious anomalous line-shape of the $e^+e^- \to {\rm hadrons}$ total cross sections in the energy region between 3.700 and 3.872 GeV from the data samples taken with the BES-II detector at the BEPC Collider. Re-analysis of the data shows that it is inconsistent with the explanation for only one simple $ψ(3770)$ resonance with a statistical significance of $7σ$. The anomalous line-shape may be explained by two possible enhancements of the inclusive hadron production near the center-of-mass energies of 3.764 GeV and 3.779 GeV, indicating that either there is likely a new structure in addition to the $ψ(3770)$ resonance around 3.773 GeV, or there are some physics effects reflecting the $D\bar D$ production dynamics.

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