Study of chi(cJ) decaying into phi K(892)(K)over-bar
Study of chi(cJ) decaying into phi K(892)(K)over-bar
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chi(cJ) 衰减为 phi K*(892)(K)over-bar 的研究
DOI：
10.1103/physrevd.91.112008
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Boyko
中科院分区：
文献类型：
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作者：
Ablikim M.;Achasov M. N.;Ai X. C.;Albayrak O.;Albrecht M.;Ambrose D. J.;Amoroso A.;An F. F.;An Q.;Bai J. Z.;Ferroli R. Baldini;Ban Y.;Bennett D. W.;Bennett J. V.;Bertani M.;Bettoni D.;Bian J. M.;Bianchi F.;Boger E.;Bondarenko O.;Boyko
利用BEPCII储存环上的BESIII探测器收集的1.06亿psi（3686）事例的数据样本，首次研究了E1辐射跃迁psi（3686）-> gamma chi（cJ）中的chi（cJ）-> phi（KSK +/-）-K-0 pi（-/+）和chi（cJ）-> phi K+K-pi（0）衰变。衰变以三体衰变chi（cJ）-> phi K*（892）（K）为主。我们通过中性和带电K*（892）测量了该反应的分支分数，发现它们在同位旋对称性的预期范围内相互一致。在K（K）对棒π不变质量分布中，观测到K*（892）（K）对棒质量阈值附近的结构，相应的质量和宽度分别为1412 +/- 4（stat）+/- 8（sys）MeV/c（2）和Gamma = 84 +/- 12（stat）+/- 40（sys）MeV。观察到的状态有利于分配给h（1）（1380），考虑到它可能的J（PC），并将其质量，宽度和衰变模式与粒子数据组中报告的那些进行比较。
Using a data sample of 106 million psi(3686) events collected with the BESIII detector operated at the BEPCII storage ring, we study for the first time the decays chi(cJ) -> phi(KSK +/-)-K-0 pi(-/+) and chi(cJ) -> phi K+K-pi(0) in the E1 radiative transition psi(3686) -> gamma chi(cJ). The decays are dominated by the three-body decay chi(cJ) -> phi K*(892)(K) over bar. We measure branching fractions for this reaction via the neutral and charged K*(892) and find them consistent with each other within the expectation of isospin symmetry. In the K (K) over bar pi invariant mass distribution, a structure near the K*(892)(K) over bar mass threshold is observed, and the corresponding mass and width are measured to be 1412 +/- 4(stat) +/- 8(sys) MeV/c(2) and Gamma = 84 +/- 12(stat) +/- 40(sys) MeV, respectively. The observed state favors an assignment to the h(1)(1380), considering its possible J(PC) and comparing its mass, width and decay mode to those reported in the Particle Data Group.