Confirmation of a charged charmoniumlike state Zc(3885)∓ in e+e- → π± (D(D)over-bar*)∓ with double D tag
Confirmation of a charged charmoniumlike state Zc(3885)∓ in e+e- → π± (D(D)over-bar*)∓ with double D tag
复制标题
用双 D 标签确认 e e 中的带电粲素态 Zc(3885)→ -> pi (D D-)
DOI：
10.1103/physrevd.92.092006
复制
发表时间：
2015-11-09
影响因子：
5
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.
本文利用BEPCII储存环上BESIII探测器收集的1092 pb（-1）和826 pb（-1）的数据样本，研究了e（+）e（-）-> pi（+/-）（D（D）over bar*）（-/+）过程.通过对末态D介子对和单身π（+）的完全重构，我们证实了在两个同位旋过程e（+）e（-）-> pi（+DD）-D-0*（-）和e（+）e（-）-> pi+D-D*（0）中，（D（D）over bar*）（-/+）系统中电荷结构Z（c）（3885）（-/+）的存在.通过执行同时拟合，确定Zc（3885）（-/+）信号的统计显著性大于10 σ，并且测量其极质量和宽度为M极=（3881.7 +/- 1.6（统计）+/- 1.6（系统））MeV/c（2）和伽马（极）=（26.6 +/- 2.0（统计）+/- 2.1（系统））MeV。玻恩截面乘以（D（D）除以棒 *）（-/+）分支分数（sigma（e（+）e（-）-> pi（+/-）Z（c）（3885）（-/+））xBr（Z（c）（3885）（-/+）->（D（D）/bar*）（-/+）测量为（141.6 +/- 7.9（stat）+/- 12.3（syst））pb在根s = 4.23 GeV和（108.4 +/- 6.9（stat）+/- 8.8（syst））pb在根s = 4.26 GeV。π（+）- Z（c）（3885）（-/+）系统的极角分布与对Z（c）（3885）（-/+）的量子数指定J（P）= 1（+）的预期一致。
We present a study of the process e(+)e(-) -> pi(+/-) (D (D) over bar*)(-/+) using data samples of 1092 pb(-1) at root s = 4.23 GeV and 826 pb(-1) at root s = 4.26 GeV collected with the BESIII detector at the BEPCII storage ring. With full reconstruction of the D meson pair and the bachelor pi(+) in the final state, we confirm the existence of the charged structure Z(c) (3885)(-/+) in the (D (D) over bar*)(-/+) system in the two isospin processes e(+)e(-) -> pi(+DD)-D-0*(-) and e(+)e(-) -> pi+D-D*(0). By performing a simultaneous fit, the statistical significance of Zc(3885)(-/+) signal is determined to be greater than 10 sigma, and its pole mass and width are measured to be M-pole = (3881.7 +/- 1.6(stat) +/- 1.6(syst)) MeV/c(2) and Gamma(pole) = (26.6 +/- 2.0(stat) +/- 2.1(syst)) MeV, respectively. The Born cross section times the (D (D) over bar*)(-/+) branching fraction (sigma(e(+)e(-) -> pi(+/-)Z(c)(3885)(-/+)) x Br(Z(c)(3885)(-/+) -> (D (D) over bar*)(-/+) )) is measured to be (141.6 +/- 7.9(stat) +/- 12.3(syst)) pb at root s = 4.23 GeV and (108.4 +/- 6.9(stat) +/- 8.8(syst)) pb at root s = 4.26 GeV. The polar angular distribution of the pi(+) - Z(c)(3885)(-/+) system is consistent with the expectation of a quantum number assignment of J(P) = 1(+) for Z(c)(3885)(-/+).