6533b860fe1ef96bd12c3240

RESEARCH PRODUCT

Observation ofe+e−→γX(3872)at BESIII

J. Y. LiuJ. H. LiuKe WangGuangshun HuangL. YanL. ZottiQ. GaoY. N. GaoY. ZhangP. F. DuanQ. AnH. H. ZhangFenfen AnC. HuX. TangB. L. WangJ. Z. FanA. ZhemchugovA. ZhemchugovT. C. ZhaoY. J. MaoZ. NingD. J. AmbroseO. FedorovH. X. YangI. GarziaShan WangXiao-rui LyuS. SchumannYao WangG. S. VarnerXian GaoK. J. ZhuHuihui LiuM. AlbrechtP. L. WangJ. P. LiuJie ZhaoD. X. LinW. D. LiH. M. HuS. AhmedY. X. YangJ. G. MesschendorpG. F. XuC. DongS. SosioJ. P. DaiJ. W. ZhangS. JinQiunan XuM. ShiM. MaggioraLing ZhaoL. J. WuA. HafnerX. N. MaY. T. LiangQ. ZhaoY. Z. SunJ. H. YinJ. Z. BaiLei ZhaoZ. L. HouA. Q. GuoY. J. MoK. H. RashidXiang ZhouY. GuoG. CibinettoJoachim PetterssonH. LeithoffM. QiW. M. SongGang ZhaoR. Baldini FerroliZhiqing LiuX. L. JiG. A. ChelkovG. A. ChelkovG. A. ChelkovX. Y. SongM. FritschM. KavatsyukH. J. YangJun-yi ZhangQ. J. XuM. ShaoY. T. GuX. LiuH. R. QiZ. J. XiaoSerkant Ali CetinH. S. ChenT. WeberTord JohanssonJ. F. ChangW. P. WangY. P. GuoI. TapanY. H. YanJ. M. BianC. Z. YuanG. MezzadriW. C. YanZ. H. QinTalib HussainQ. P. JiQ. OuyangJ. W. ZhaoO. B. KolcuO. B. KolcuZhenyu ZhangS. J. ZhaoYunlong ZhangY. WangZ. P. ZhangX. CaiD. BettoniR. FarinelliY. H. ZhengCong-feng QiaoS. S. FangO. AlbayrakZ. H. WangX. N. LiHaiping PengJ. L. ZhangY. C. ZhuMagnus WolkeLiqing XuX. Y. ShenY. F. LiangS. QianR. PolingJialun PingK. ZhangB. X. ZhangX. Y. ZhangJianping ZhengF. LiS. ZhuM. LaraJ. B. LiuY. J. SunE. BogerE. BogerX. Q. HaoY. P. LuA. YuncuA. YuncuH. L. MaD. M. LiF. C. MaP. MusiolH. XiaoTao LuoD. P. JinX. B. JiD. Y. LiuJ. B. JiaoYu ZhangH. J. LuJ. G. LuY. B. LiuD. W. BennettZujian WangS. Q. ZhangT. HeldJ. C. ChenK. GoetzenW. G. LiS. SpataroX. P. XuI. UmanN. Yu. MuchnoiN. Yu. MuchnoiC. F. RedmerXiaocong AiC. SchnierB. X. YuY. DingF. E. MaasKrisztian PetersDayong WangN. QinJ. J. ZhangNasser Kalantar-nayestanakiM. DestefanisX. S. KangP. PatteriT. HuY. G. XieS. X. DuY. Y. LiuE. FioravantiX. T. HuangA. A. ZafarXiangdong RuanG. RongLei LiZ. L. DouQ. LiuB. J. LiuH. M. LiuY. H. GuanL. P. ZhouC. Morales MoralesM. PelizaeusZhi ZengY. H. ZhangXiaozhong HuangX. FangJ. F. QiuP. LarinG. R. LiaoX. C. LouX. C. LouX. Y. JiangKai LiuJ. F. HuG. F. CaoL. FavaW. KühnS. B. LiuP. X. ShenA. CalcaterraA. CalcaterraJin LiY. M. MaZ. P. MaoA. ZalloM. M. MaP. R. LiZ. A. ZhuZ. Y. WangF. NerlingZ. L. HuangZ. WuFeng LiuF. A. HarrisL. W. JiangX. L. KangA. SarantsevA. SarantsevM. BertaniZ. HaddadiY. X. XiaS. H. ZhuH. S. ChenL. L. MaBingxuan LiuZhiqing ZhangL. YangH. P. ChengJ. FangTao LiY. NefedovL. GongD. H. WeiJ. S. LangeQ. W. ZhaoM. H. GuZ. GaoY. PanC. P. ShenH. L. DaiIgor BoykoE. H. ThorndikeM. G. ZhaoM. AblikimR. P. GuoAndrzej KupscH. J. LiM. H. YeS. J. ChenW. L. YuanG. LiCh. RosnerG. X. SunJ. V. BennettC. LengY. N. ZhangQ. L. XiuL. G. XiaL. Q. QinS. HanF. FeldbauerW. GradlH. LiangM. RipkaZ. JiaoFu-hu LiuD. H. ZhangCui LiC. D. FuP. L. WangZ. G. WangChi ZhangI. B. NikolaevI. B. NikolaevQ. P. JiD. Y. WangL. H. WuJ. MinM. L. ChenH. Y. ZhangM. SavrieY. B. ZhaoA. AmorosoJ. Q. ZhangX. L. LuoL. XiaW. ShanG. F. ChenJ. DongB. KopfC. Q. FengX. R. ChenS. Z. ChenK. L. HeJ. Y. ZhangH. Y. ShengJ. J. XuX. C. ChenY. Q. WangX. Y. GaoM. Z. WangS. NisarJimin ZhaoA. DbeyssiC. J. TangY. HuY. P. LuY. B. LiYaquan FangZ. Y. DengJ. S. HuangY. K. HengW. P. WangF. BianchiJ. F. SunL. D. LiuB. WangD. XiaoL. Y. DongC. X. LiuK. SchoenningQ. Y. LiB. S. ZouC. X. YuNiklaus BergerM. KornicerW. J. ZhengS. MarcelloY. ZengA. JulinB. ZhengR. G. PingXingguo LiF. De MoriX. K. ChuY. B. ChenXiaofeng ZhuJ. Z. ZhangX. Y. ZhouR. KliemtX. H. MoL. S. WangM. H. YeX. F. WangQ. M. MaB. KlossX. Y. NiuY. YuanY. S. ZhuL. L. WangH. CaiJie YuPeilian LiuLingxuan ZhangZ. T. SunK. J. ZhuZ. A. LiuV. PrasadY. BanP. WeidenkaffF. H. HeinsiusS. P. WenX. S. QinX. R. ZhouCheng LiH. B. LiA. G. DenigC. L. LuoC. C. ZhangB. ZhongL. B. GuoH. MuramatsuUlrich WiednerT. MaS. L. NiuF. Y. LiZ. G. ZhaoX. Q. LiM. GrecoZ. J. SunH. LoehnerK. Y. LiuJ. C. LiZ. B. LiJ. ZhuangM. X. LuoJian WeiYucheng HuangD. V. DedovichY. F. WangX. Y. MaW. X. GongX. K. ZhouFang LiuI. DenysenkoX. H. SunP. KieseB. Y. ZhangS. L. OlsenRoy A. BriereM. Y. DongM. TiemensH. B. LiuJ. H. ZouX. S. JiangS. S. SunR. E. MitchellBibo KeW. B. YanM. N. AchasovM. N. AchasovGiulietto FeliciS. PacettiO. CakirKe LiT. Holtmann

subject

Physics010308 nuclear & particles physicsBranching fractionElectron–positron annihilationAnalytical chemistryGeneral Physics and AstronomySigmaElectronMass spectrometry01 natural sciencesNuclear physicsPositronIsospin0103 physical sciencesPiMass spectrumRadiative transitionHigh Energy Physics::ExperimentInvariant massCenter of massAtomic physicsNuclear Experiment010306 general physicsStorage ring

description

Using data collected with the BESIII detector operating at the Beijing Electron Positron Collider at center-of-mass energies of root s = 4.23, 4.26, and 4.36 GeV, we observe e(+)e(-) -> pi(0)pi(0)h(c) for the first time. The Born cross sections are measured and found to be about half of those of e(+)e(-) -> pi(+)pi(-)h(c) within less than 2 sigma. In the pi(0)h(c) mass spectrum, a structure at 4.02 GeV/c(2) is found. It is most likely to be the neutral isospin partner of the Z(c)(4020)(+/-) observed in the process of e(+)e(-) -> pi(+)pi(-)h(c) being found. A fit to the pi(0)h(c) invariant mass spectrum, with the width of the Z(c)(4020)(0) fixed to that of its charged isospin partner and possible interferences with non-Z(c)(4020)(0) amplitudes neglected, gives a mass of (4023.9 +/- 2.2 +/- 3.8) MeV/c(2) for the Z(c)(4020)(0), where the first error is statistical and the second systematic.

https://doi.org/10.1103/physrevlett.112.092001