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Institute of High Energy Physics, Beijing 100049, People's Republic of China.
G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia.
Phys Rev Lett. 2019 Jun 14;122(23):232002. doi: 10.1103/PhysRevLett.122.232002.
We study the e^{+}e^{-}→γωJ/ψ process using 11.6 fb^{-1} e^{+}e^{-} annihilation data taken at center-of-mass energies from sqrt[s]=4.008 GeV to 4.600 GeV with the BESIII detector at the BEPCII storage ring. The X(3872) resonance is observed for the first time in the ωJ/ψ system with a significance of more than 5σ. The relative decay ratio of X(3872)→ωJ/ψ and π^{+}π^{-}J/ψ is measured to be R=1.6_{-0.3}^{+0.4}±0.2, where the first uncertainty is statistical and the second systematic (the same hereafter). The sqrt[s]-dependent cross section of e^{+}e^{-}→γX(3872) is also measured and investigated, and it can be described by a single Breit-Wigner resonance, referred to as the Y(4200), with a mass of 4200.6_{-13.3}^{+7.9}±3.0 MeV/c^{2} and a width of 115_{-26}^{+38}±12 MeV. In addition, to describe the ωJ/ψ mass distribution above 3.9 GeV/c^{2}, we need at least one additional Breit-Wigner resonance, labeled as X(3915), in the fit. The mass and width of the X(3915) are determined. The resonant parameters of the X(3915) agree with those of the Y(3940) in B→KωJ/ψ and of the X(3915) in γγ→ωJ/ψ observed by the Belle and BABAR experiments within errors.
我们使用在北京正负电子对撞机（BEPCII）储存环上的北京谱仪III（BESIII）探测器，在质心能量从(\sqrt{s}=4.008) GeV到4.600 GeV范围内采集的(11.6,\text{fb}^{-1})正负电子湮灭数据，研究(e^{+}e^{-}\to\gamma\omega J/\psi)过程。首次在(\omega J/\psi)系统中观测到(X(3872))共振，显著性超过(5\sigma)。测量得到(X(3872)\to\omega J/\psi)与(\pi^{+}\pi^{-}J/\psi)的相对衰变率为(R = 1.6_{-0.3}^{+0.4}\pm0.2)，其中第一个不确定度是统计性的，第二个是系统性的（此后相同）。还测量并研究了(e^{+}e^{-}\to\gamma X(3872))的(\sqrt{s})依赖的截面，它可以用一个单一的布赖特 - 维格纳共振来描述，称为(Y(4200))，其质量为(4200.6_{-13.3}^{+7.9}\pm3.0,\text{MeV}/c^{2})，宽度为(115_{-26}^{+38}\pm12,\text{MeV})。此外，为了描述高于(3.9,\text{GeV}/c^{2})的(\omega J/\psi)质量分布，在拟合中我们至少需要一个额外的布赖特 - 维格纳共振，标记为(X(3915))。确定了(X(3915))的质量和宽度。在误差范围内，(X(3915))的共振参数与在(B\to K\omega J/\psi)中观测到的(Y(3940))以及在(\gamma\gamma\to\omega J/\psi)中由Belle和BABAR实验观测到的(X(3915))的共振参数一致。
