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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. 2015 Oct 30;115(18):182002. doi: 10.1103/PhysRevLett.115.182002. Epub 2015 Oct 29.
We report a study of the process e^{+}e^{-}→(D^{}D[over ¯]^{})^{0}π^{0} using e^{+}e^{-} collision data samples with integrated luminosities of 1092 pb^{-1} at sqrt[s]=4.23 GeV and 826 pb^{-1} at sqrt[s]=4.26 GeV collected with the BESIII detector at the BEPCII storage ring. We observe a new neutral structure near the (D^{}D[over ¯]^{})^{0} mass threshold in the π^{0} recoil mass spectrum, which we denote as Z_{c}(4025)^{0}. Assuming a Breit-Wigner line shape, its pole mass and pole width are determined to be (4025.5_{-4.7}^{+2.0}±3.1) MeV/c^{2} and (23.0±6.0±1.0) MeV, respectively. The Born cross sections of e^{+}e^{-}→Z_{c}(4025)^{0}π^{0}→(D^{}D[over ¯]^{})^{0}π^{0} are measured to be (61.6±8.2±9.0) pb at sqrt[s]=4.23 GeV and (43.4±8.0±5.4) pb at sqrt[s]=4.26 GeV. The first uncertainties are statistical and the second are systematic.
我们报告了一项使用在北京正负电子对撞机（BEPCII）储存环上的北京谱仪III（BESIII）探测器收集的质心能量(\sqrt{s}=4.23) GeV时积分亮度为(1092) pb(^{-1})以及质心能量(\sqrt{s}=4.26) GeV时积分亮度为(826) pb(^{-1})的正负电子碰撞数据样本，对过程(e^{+}e^{-}\to(D^{}D[\overline{}])^{0}\pi^{0})进行的研究。我们在(\pi^{0})反冲质量谱中((D^{}D[\overline{}])^{0})质量阈值附近观测到一个新的中性结构，我们将其记为(Z_{c}(4025)^{0})。假设布赖特 - 维格纳线形，其极点质量和极点宽度分别确定为((4025.5_{-4.7}^{+2.0}\pm3.1)) MeV/(c^{2})和((23.0\pm6.0\pm1.0)) MeV。测量得到(e^{+}e^{-}\to Z_{c}(4025)^{0}\pi^{0}\to(D^{}D[\overline{}])^{0}\pi^{0})在(\sqrt{s}=4.23) GeV时的玻恩截面为((61.6\pm8.2\pm9.0)) pb，在(\sqrt{s}=4.26) GeV时为((43.4\pm8.0\pm5.4)) pb。第一个不确定度是统计性的，第二个是系统性的。
