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arXiv 0803.2838hep-ex
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B->X(3872)K,X(3872)->J/Psi π + π-的研究

A study of B->X(3872) K, with X(3872)->J/Psi pi+ pi-

The BABAR Collaboration, B. Aubert

摘要:

我们测量了衰变B ~+ -> X(3872)K ~+和B ~ 0-> X(3872)K ~ 0,其中X(3872)-> Jpsi π + π ~-.所使用的数据样本是由PEP-II e+e非对称储能环上的BABAR探测器收集的,对应于455 x 10^6个BBbar对。高炉煤气支化率的测定(B+ -> X(3872)K+)x BF(X(3872)-> Jpsi pi+ pi-)=得到(8.4 +/- 1.5 +/- 0.7)x 10^{-6}和BF(B 0-> X(3872)K 0)x BF(X(3872)-> Jpsi pi+ pi- =(3.5 +/- 1.9 +/- 0.4)x 10^{-6}。在90%的置信水平下,我们设定了X(3872)的自然宽度上限,即γ < 3.3 MeV/c^2。

英文摘要:

We present measurements of the decays B+ -> X(3872) K+ and B0 -> X(3872) K0 with X(3872) -> Jpsi pi+ pi-. The data sample used, collected with the BABAR detector at the PEP-II e+e- asymmetric-energy storage ring, corresponds to 455 x 10^6 BBbar pairs. Branching fraction measurements of BF(B+ -> X(3872) K+) x BF(X(3872) -> Jpsi pi+ pi-) = (8.4 +/- 1.5 +/- 0.7) x 10^{-6} and BF(B0 -> X(3872) K0) x BF(X(3872) -> Jpsi pi+ pi- = (3.5 +/- 1.9 +/- 0.4) x 10^{-6} are obtained. We set an upper limit on the natural width of the X(3872) of Gamma < 3.3 MeV/c^2 at the 90% confidence level.

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