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arXiv 0710.1371hep-ex
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DDbar系统唯一初态辐射产生的研究

Study of the Exclusive Initial-State-Radiation Production of the DDbar System

The BABAR Collaboration, B. Aubert

摘要:

在质心能量为10.58GeV的电子正电子湮没的D-Dbar事件中,寻找粲偶素和其它新态.数据样本对应于384 fb-1的积分亮度,并由PEP-II储存环上的BABAR实验记录。D-D巴质谱显示了psi(3770)以及其他在3.9、4.1和4.4 GeV/c^2附近的结构的明显证据。没有观察到Y(4260)-> D Dbar的证据,导致在90%置信水平下B(Y(4260)-> D Dbar)/B(Y(4260)-> J/psi pi+ pi-)< 1.0的上限。

英文摘要:

A search for charmonium and other new states is performed in a study of exclusive initial-state-radiation production of D Dbar events from electron-positron annihilations at a center-of-mass energy of 10.58 GeV. The data sample corresponds to an integrated luminosity of 384 fb-1 and was recorded by the BABAR experiment at the PEP-II storage ring. The D Dbar mass spectrum shows clear evidence of the psi(3770) plus other structures near 3.9, 4.1, and 4.4 GeV/c^2. No evidence for Y(4260) -> D Dbar is observed, leading to an upper limit of B(Y(4260) -> D Dbar)/B(Y(4260) -> J/psi pi+ pi-) < 1.0 at 90 % confidence level.

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