Search for new charmonium states in the processes e+ e- --> J/psi D(*) D(*) at sqrt{s} ~ 10.6 GeV
Search for new charmonium states in the processes e+ e- --> J/psi D(*) D(*) at sqrt{s} ~ 10.6 GeV
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DOI：
10.1103/physrevlett.100.202001
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发表时间：
2007-08
影响因子：
8.6
通讯作者：
B. C. K. Abe;E. al.
中科院分区：
文献类型：
--
作者：
B. C. K. Abe;E. al.
我们对过程e+e- -> J/psi D* Dbar中的X（3940）态进行了研究。X（3940）的质量和宽度被测量为（3942 + 7 - 6 +- 6）MeV/c^2，伽马=（37 + 26 - 15 +- 8 MeV。在过程e+e-> J/psi D* D*bar中，我们在D*+ D*-组合的不变质量谱中观察到另一个类粲偶素态，记作X（4160）。X（4160）的参数是M= 4156 + 25 - 20 +- 15 MeV/c^2，γ = 139 + 111 - 61 +- 21 MeV。该分析是基于在KEKB e+ e-不对称能量对撞机上用贝儿探测器记录的接近于Upperdance（4S）共振的积分光度为693 /fb的数据样本。
We present a study of the X(3940) state in the process e+e- -> J/psi D* Dbar. The X(3940) mass and width are measured to be (3942 +7 -6 +- 6)MeV/c^2 and Gamma=(37 + 26 - 15 +- 8 MeV. In the process e+e- -> J/psi D* D*bar we have observed another charmonium-like state, which we denote as X(4160), in the spectrum of invariant masses of D*+ D*- combinations. The X(4160) parameters are M= 4156 + 25 - 20 +- 15 MeV/c^2 and Gamma = 139 + 111 -61 +- 21 MeV. The analysis is based on a data sample with an integrated luminosity of 693 /fb recorded near the Upsilon(4S) resonance with the Belle detector at the KEKB e+ e- asymmetric-energy collider.