Evidence for a new resonance and search for the Y(4140) in the gammagamma-->phiJ/psi process.
Evidence for a new resonance and search for the Y(4140) in the gammagamma-->phiJ/psi process.
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DOI：
10.1103/physrevlett.104.112004
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发表时间：
2009-12
影响因子：
8.6
通讯作者：
C. Shen;C. Yuan;H. Aihara;K. Arinstein;T. Aushev;A. Bakich;V. Balagura;E. Barberio;A. Bay
中科院分区：
文献类型：
--
作者：
C. Shen;C. Yuan;H. Aihara;K. Arinstein;T. Aushev;A. Bakich;V. Balagura;E. Barberio;A. Bay
使用Belle检测器收集的825 fb{-1}的数据样本来测量gamma- >phiJ/psi过程。观测到8.8{-3.2}{+4.2}事件的窄峰，包括系统不确定性在内的显著性为3.2标准差。该结构[命名为X(4350)]的质量和自然宽度分别为[4350.6{-5.1}{+4.6}(stat)+/-0.7(syst)] MeV/c{2}和[13{-9}{+18}(stat)+/-4(syst)] MeV。当J{P}=0{+}时，其双光子衰减宽度和分支分数与phiJ/psi的乘积为[6.7{-2.4}{+3.2}(stat)+/-1.1(syst)] eV；当J{P}=2{+}时，其乘积为[1.5{-0.6}{+0.7}(stat)+/-0.3(syst)] eV。CDF合作者在B—>K{+}phiJ/psi衰减中没有观测到Y（4140）—>phiJ/psi结构的信号，并且当J{P}=0时，Gamma_{gammagamma}(Y(4140))B(Y（4140）—>phiJ/psi)<41 eV；当J{P}=2{+}时，{+}或<6.0 eV是在90% c.l处确定的，这不利于Y（4140）是D{s}{*+}D{s}{*-}分子的情况。
The process gammagamma-->phiJ/psi is measured using a data sample of 825 fb{-1} collected with the Belle detector. A narrow peak of 8.8{-3.2}{+4.2} events, with a significance of 3.2 standard deviations including systematic uncertainty, is observed. The mass and natural width of the structure [named X(4350)] are measured to be [4350.6{-5.1}{+4.6}(stat)+/-0.7(syst)] MeV/c{2} and [13{-9}{+18}(stat)+/-4(syst)] MeV, respectively. The product of its two-photon decay width and branching fraction to phiJ/psi is [6.7{-2.4}{+3.2}(stat)+/-1.1(syst)] eV for J{P}=0{+}, or [1.5{-0.6}{+0.7}(stat)+/-0.3(syst)] eV for J{P}=2{+}. No signal for the Y(4140)-->phiJ/psi structure reported by the CDF Collaboration in B-->K{+}phiJ/psi decays is observed, and limits of Gamma_{gammagamma}(Y(4140))B(Y(4140)-->phiJ/psi)<41 eV for J{P}=0;{+} or <6.0 eV for J{P}=2{+} are determined at the 90% C.L. This disfavors the scenario in which the Y(4140) is a D{s}{*+}D{s}{*-} molecule.