Study of e+e- → γωJ/ψ and Observation of X(3872) → ωJ/ψ
Study of e+e- → γωJ/ψ and Observation of X(3872) → ωJ/ψ
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DOI：
10.1103/physrevlett.122.232002
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发表时间：
2019-06-14
影响因子：
8.6
通讯作者：
Zou, J. H.
中科院分区：
文献类型：
--
作者：
Ablikim, M.;Achasov, M. N.;Zou, J. H.
用北京正负电子对撞机储存环上的BESIII探测器在根S=4.008 GeV到4.600 GeV的质心能量下的11.6Fb(-1)e(+)e(-)湮没数据，研究了e(+)e(-)->；Gamma omega J/psi过程。首次在omega J/psi体系中观察到X(3872)共振，其意义大于5西格玛。X(3872)-gt；omega J/psi和pi(+)pi(-)J/psi的相对衰变比为R=1.6(-0.3)(+0.4)+/-0.2，其中第一个不确定度是统计的，第二个系统的不确定度(下同)。还测量和研究了e(+)e(-)->；Gamma X(3872)的根S相关截面，它可用质量为4200.6(-13.3)(+7.9)+/-3.0 MeV/c(2)，宽度为115(-26)(+38)+/-12 MeV的单个Breit-Wigner共振来描述。此外，为了描述高于3.9GeV/c(2)的omega J/psi质量分布，我们在FIT中至少需要一个额外的Breit-Wigner共振，标记为X(3915)。确定了X(3915)的质量和宽度。X(3915)的共振参数与由Belle和Babar实验观测到的B->；K omega J/psi中的Y(3940)和伽马--gt；omega J/psi中的X(3915)的共振参数在误差范围内一致。
We study the e(+)e(-) -> gamma omega J/psi process using 11.6 fb(-1) e(+)e(-) annihilation data taken at center-of-mass energies from root 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 omega J/psi system with a significance of more than 5 sigma. The relative decay ratio of X(3872) -> omega J/psi and pi(+)pi(-)J/psi 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 root s-dependent cross section of e(+)e(-) -> gamma X(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 omega J/psi 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 -> K omega J/psi and of the X(3915) in gamma gamma -> omega J/psi observed by the Belle and BABAR experiments within errors.