6533b826fe1ef96bd12844ff

RESEARCH PRODUCT

Observation of a Charged Charmoniumlike StructureZc(4020)and Search for theZc(3900)ine+e−→π+π−hc

F. LiF. C. MaI. UmanX. Q. LiM. GrecoM. GrecoS. SchumannM. QiJ. F. QiuZhiqing LiuM. UllrichZ. H. WangJ. F. ChangK. Y. LiuC. F. RedmerY. DingP. LarinJ. F. SunX. T. HuangB. J. LiuX. L. JiS. P. YuG. A. ChelkovM. AblikimA. A. ZafarG. RongH. J. LuC. HuX. TangJ. G. LuX. CaiX. R. LiY. ZengZhe SunTalib HussainG. R. LuY. F. WangW. G. LiS. SpataroS. SpataroX. P. XuL. FavaL. FavaF. E. MaasH. M. LiuG. F. CaoS. B. LiuZ. G. ZhaoQ. M. MaT. HuY. B. ChenXiaofeng ZhuJ. Z. ZhangZ. A. ZhuX. Y. MaY. F. LiangK. J. ZhuXuantong ZhangD. P. JinB. KlossH. MoeiniW. X. GongY. YuanY. S. ZhuY. Z. YangL. HuangY. G. XieMichael WernerK. MoriyaL. L. JiangI. TapanY. H. YanM. BertaniZ. P. ZhangL. H. WuXiangdong RuanDayong WangP. L. LiuX. H. MoL. S. WangQ. LiuLei ZhaoY. H. ZhengCong-feng QiaoS. X. DuGuangming HuangY. T. LiangC. P. ShenO. AlbayrakM. H. YeQ. A. MalikK. GoetzenZ. J. SunH. LoehnerJ. W. ZhaoD. Cronin-hennessyY. C. ZhuW. KuehnJ. M. BianZhenyu ZhangZujian WangY.n. GaoC. H. LiW. LaiP. L. WangMeng WangC. B. ZhangD. X. LinKai LiuX. L. WangH. H. ZhangX. C. LouJ. B. JiaoL. G. XiaA. CalcaterraA. CalcaterraZ. WuN. Yu. MuchnoiZ. B. LiH. M. HuL. L. WangH. CaiHeng-yun YeF. A. HarrisJie YuY. H. ZhangS. L. OlsenM. H. GuY. H. GuanX. H. ZhaoW. GradlM. L. ChenK. H. RashidRoy A. BriereM. KornicerM. ShaoY. T. GuM. KavatsyukY. NefedovShan WangQ. G. WenH. Y. ShengM. MaggioraM. MaggioraLing ZhaoZ. NingM. RipkaT. HeldXiao-tong LuY. B. ZhaoChi ZhangW. ShanX. S. JiangJ. W. ZhangQ. J. LiJ. C. ChenJ. C. LiJ. MinC. X. YuT. J. MinK. J. ZhuZ. Y. WangD. LiB. X. ZhangZ. Y. HeZ. L. HouYang YangY. L. HanB. SpruckE. H. ThorndikeD. Y. WangX. K. ZhouD. J. AmbroseY. Q. WangS. NisarB. ZhengR. G. PingB. KopfG. S. VarnerA. SarantsevD. H. WeiJ. S. LangeJ. ZhuangA. ZalloM. X. LuoJian WeiYucheng HuangD. V. DedovichX. K. ChuM. H. YeY. D. WangH. L. MaL. Q. QinD. M. LiC. J. TangJianping ZhengY. P. LuXuejun WangH. MuramatsuX. R. ChenN. LiE. PrencipeNasser Kalantar-nayestanakiO. CakirC. Morales MoralesYang QinY. X. XiaK. L. HeFeng LiuQ. P. JiL. Y. DongC. Z. YuanJ. P. DaiM. LvZ. XueW. D. LiS. J. ChenO. BondarenkoN. WuG. LiKrisztian PetersG. F. XuX. LiuQun-yao WangLili ZhangM. PelizaeusS. H. ZhangX. Y. ShenY. X. YangZhenli XuH. B. LiM. DestefanisM. DestefanisA. G. DenigC. L. LuoS. JinW. M. DingC. GengQ. L. XiuC. D. FuP. R. LiCui LiC. Q. FengZ. J. XiaoY. P. GuoZ. A. LiuJ. Q. ZhangC. C. ZhangB. ZhongL. B. GuoLei LiY. BanP. WeidenkaffZ. Y. DengB. Q. WangT. GuoG. X. SunLi YanSerkant Ali CetinM. R. ShepherdS. P. WenX. S. QinX. R. ZhouUlrich WiednerJ. L. FuQ. ZhaoP. L. WangXingguo LiCheng LiZ. JiaoFu-hu LiuD. H. ZhangY. Z. SunX. L. LuoT. MaX. Y. SongJ. Z. BaiS. QianJialun PingS. MaX. Y. ZhangD. TothM. G. ZhaoS. L. ZangM. LaraY. J. SunE. BogerY. P. ChuX. B. JiSanfeng WuXiang ZhouJ. S. HuangC. X. LiuGang ZhaoY. J. MaoZ. G. WangH. Y. ZhangP. FriedelY. ZhangQ. AnWei WuA. ZhemchugovG. F. ChenG. R. LiaoW. L. YuanJ. Y. ZhangF. F. JingQ. OuyangY. K. HengS. S. FangY. B. LiuO. FuksR. Baldini FerroliQ. J. XuX. N. LiHaiping PengHai YuTao LuoM. Y. DongJ. V. BennettB. S. ZouB. X. YuH. S. ChenShujun ZhaoH. L. DaiIgor BoykoH. B. LiuKe WangJ. H. ZouW. C. YanZhiqiang LiuMiao HeS. BraunR. PolingV. V. BytevS. S. SunFenfen AnT. C. ZhaoZhenghao ZhangJifeng HuL. P. ZhouJürgen BeckerZ. P. MaoH. P. ChengR. E. MitchellA. Q. GuoW. M. SongM. LeyheZ. H. QinJ. FangChuan LiuK. LiH. X. YangHuihui LiuJ. P. LiuFang LiuJ. W. ParkJ. G. MesschendorpG. S. HuangQiunan XuI. DenysenkoC. S. JiB. Y. ZhangH. LiangI. B. NikolaevQ. P. JiW. B. YanM. N. AchasovS. Pacetti

subject

PhysicsPositronElectron–positron annihilationPiMass spectrumAnalytical chemistryGeneral Physics and AstronomyInvariant massState (functional analysis)ElectronAtomic physicsBar (unit)

description

We study e(+)e(-) -> pi(+) pi(-)h(c) at center-of-mass energies from 3.90 to 4.42 GeV by using data samples collected with the BESIII detector operating at the Beijing Electron Positron Collider. The Born cross sections are measured at 13 energies and are found to be of the same order of magnitude as those of e(+)e(-) -> pi(+) pi(-) J/Psi but with a different line shape. In the pi(+/-)h(c) mass spectrum, a distinct structure, referred to as Z(c)(4020) is observed at 4. 02 GeV/c(2). The Z(c)(4020) carries an electric charge and couples to charmonium. A fit to the pi(+/-)h(c) invariant mass spectrum, neglecting possible interferences, results in a mass of (4022.9 +/- 0.8 +/- 2.7) MeV/c(2) and a width of (7.9 +/- 2.7 +/- 2.6) MeV for the Z(c)(4020), where the first errors are statistical and the second systematic. The difference between the parameters of this structure and the Z(c) (4025) observed in the D*(D) over bar* final state is within 1.5 sigma, but whether they are the same state needs further investigation. No significant Z(c)(3900) signal is observed, and upper limits on the Z(c)(3900) production cross sections in pi +/- h(c) at center-of-mass energies of 4.23 and 4.26 GeVare set.

https://doi.org/10.1103/physrevlett.111.242001