6533b7d9fe1ef96bd126d501

RESEARCH PRODUCT

Evidence of Two Resonant Structures in e+e−→π+π−hc

E. H. ThorndikeP. L. WangL. Q. QinI. TapanY. H. YanJ. W. ZhaoX. L. LuoA. CalcaterraH. J. LuJ. G. LuX. L. GaoF. E. MaasF. De MoriY. X. XiaS. H. ZhuJ. M. BianS. J. ZhaoR. FarinelliL. ZottiJ. Z. BaiF. FeldbauerT. HuY. C. ZhuW. P. WangJ. F. ChangA. Q. GuoW. M. SongY. B. ZhaoK. LiX. K. ZhouFang LiuQ. J. XuR. Baldini FerroliC. DongTao LuoS. SosioO. BakinaB. X. YuZhi ZengH. CaiH. L. MaD. M. LiIgor BoykoG. CibinettoMagnus WolkeXuanhong LouX. C. ChenH. XiaoE. BogerX. B. JiW. ShanJ. DongI. DenysenkoX. N. LiHaiping PengJ. H. LiuA. DbeyssiY. F. LiangKe WangNasser Kalantar-nayestanakiH. LiangX. Y. ZhouP. F. DuanB. L. WangT. C. ZhaoGuangshun HuangL. YanYao WangL. J. WuD. P. JinC. Morales MoralesT. HeldP. PatteriW. P. WangJoachim PetterssonY. Q. WangZ. H. QinZ. NingP. X. ShenR. PolingM. PelizaeusH. L. DaiJin LiF. LiY. J. MoS. NisarC. J. TangB. Y. ZhangZ. WuL. W. JiangY. H. GuanGueorgui ChelkovJie ZhaoD. X. LinJ. F. SunT. HoltmannR. KliemtAlexey ZhemchugovH. M. HuY. HuC. HuY. P. LuF. C. MaJ. Y. LiuDayong WangN. QinM. QiX. TangZhiqing ZhangD. J. AmbroseM. G. ZhaoW. G. LiQ AnJie YuA. YuncuJ. W. ZhangB. WangR. P. GuoH. J. YangY. N. ZhangH. S. ChenT. WeberXiaozhong HuangS. MarcelloZhiqing LiuXiao-rui LyuX. F. WangQ. P. JiKai LiuY. ZengS. SpataroI. UmanD. XiaoGuo-ming ChenQ. GaoY. N. GaoT. JohanssonY. ZhangX. Y. JiangC. LengZ. G. WangX. P. XuY. Y. LiuH. Y. ZhangQ. P. JiQ. M. MaQ. OuyangLei LiO. B. KolcuY. H. ZhengT. J. MinK. J. ZhuP. LarinM. M. MaJ. C. ChenCong-feng QiaoO. AlbayrakK. J. ZhuYuehong XieJ. Z. FanJ. F. QiuS. S. FangL. LavezziYaquan FangX. FangS. Z. ChenW. D. LiH. M. LiuL. FavaX. Q. HaoN. Yu. MuchnoiB. KlossY. B. LiuZahra HaddadiAndrzej KupscLiqing XuX. Y. ShenZ. L. HuangG. S. VarnerFeng LiuX. Y. NiuBibo KeW. B. YanX. S. KangY. J. MaoY. H. ZhangYunlong ZhangJ. Y. ZhangY. PanG. FeliciS. AhmedY. X. YangJ. ChaiH. X. YangY. DingY. YuanY. S. ZhuM. BertaniYu ZhangJ. Q. ZhangI. GarziaXiaofeng ZhuJ. Z. ZhangJ. L. ZhangG. X. SunS. PacettiZ. JiaoFu-hu LiuD. H. ZhangB. J. LiuD. BettoniBingxuan LiuK. SchoenningQ. Y. LiB. S. ZouM. MaggioraLing ZhaoJianping ZhengS. ZhuLei ZhaoZ. Y. WangA. HafnerJ. P. LiuZ. L. HouH. J. LiG. LiX. N. MaW. KühnQ. ZhaoDmitri DedovichY. Z. SunX. L. JiQ. LiuY. NefedovX. D. RuanNiklaus BergerQ. A. MalikG. MezzadriW. C. YanYi ChenX. K. ChuM. Y. DongQ. L. XiuXiang ZhouJ. J. ZhangJ. G. MesschendorpZ. Y. YouZ. A. ZhuY. K. HengJun-yi ZhangY. P. GuoL. L. MaM. TiemensZ. P. ZhangH. B. LiuM. AblikimM. DestefanisJ. H. ZouP. L. WangZ. J. XiaoY. BanM. FritschL. GongQiunan XuGang ZhaoL. G. XiaC. D. FuD. W. BennettZujian WangL. P. ZhouC. Z. YuanM. KavatsyukC. P. ShenKrisztian PetersX. CaiS. S. SunYanwei WangS. B. LiuY. M. MaM. N. AchasovZ. P. MaoF. F. AnC. Q. FengX. R. ChenY. G. XieF. A. HarrisJ. FangTao LiL. YangB. X. ZhangH. LeithoffZ. GaoM. AlbrechtS. X. DuR. A. BriereA. JulinZ. L. DouCh. RosnerG. R. LiaoJ. F. HuCui LiXingguo LiW. GradlR. E. MitchellM. RipkaD. Y. WangJ. MinB. KopfK. L. HeM. Z. WangJimin ZhaoS. HanL. H. WuM. SavrieK. GoetzenL. XiaZ. H. WangJ. J. XuP. MusiolC. F. RedmerXiaocong AiY. B. LiC. SchnierX. T. HuangJ. S. HuangC. X. LiuG. RongX. LiuH. R. QiA. A. ZafarSerkant Ali CetinK. H. RashidG. F. XuD. Y. LiuJ. B. JiaoY. T. LiangS. Q. ZhangS. J. ChenS. JinG. F. CaoY. GuoS. QianJialun PingA. AmorosoK. ZhangX. Y. ZhangM. LaraJ. B. LiuX. Y. SongY. J. SunY. P. LuJ. P. DaiPeilian LiuLingxuan ZhangZ. G. ZhaoZhiyong ZhangI. B. NikolaevJ. H. YinF. BianchiM. ShaoY. T. GuH. H. ZhangM. H. GuH. Y. ShengC. X. YuE. FioravantiZ. J. SunH. LoehnerB. ZhengR. G. PingZ. T. SunX. L. KangA. SarantsevD. H. WeiP. R. LiP. R. LiZ. A. LiuJ. S. LangeV. PrasadP. WeidenkaffQ. W. ZhaoM. H. YeF. H. HeinsiusS. P. WenX. S. QinX. R. ZhouL. D. LiuH. B. LiL. Y. DongCheng LiC. L. LuoW. J. ZhengF. NerlingC. C. ZhangB. ZhongL. B. GuoX. H. MoL. S. WangM. H. YeL. L. WangH. MuramatsuUlrich WiednerM. KornicerT. MaZ. Y. DengH. H. LiuJ. C. LiJ. ZhuangA. DenigM. X. LuoM. L. ChenY. F. WangJ. V. BennettT. HussainX. Y. MaW. X. GongX. H. SunS. L. NiuF. Y. LiX. Q. LiM. GrecoK. Y. LiuZ. B. LiW. Ikegami AnderssonOrhan CakirP. KieseS. L. OlsenX. S. Jiang

subject

Mass enhancementPhysicsPositron010308 nuclear & particles physicsElectron–positron annihilation0103 physical sciencesAnalytical chemistryPiGeneral Physics and AstronomyElectronAtomic physics010306 general physics01 natural sciences

description

The cross sections of e(+)e(-) -> pi(+) pi(-) hc at center-of-mass energies from 3.896 to 4.600 GeVare measured using data samples collected with the BESIII detector operating at the Beijing Electron Positron Collider. The cross sections are found to be of the same order of magnitude as those of e(+)e(-) -> pi(+) pi(-) J/psi and e(+)e(-) -> pi(+) pi(-) psi (2S), but the line shape is inconsistent with the Y states observed in the latter two modes. Two structures are observed in the e(+)e(-) -> pi(+) pi(-) hc cross sections around 4.22 and 4.39 GeV/c(2), which we call Y(4220)and Y(4390), respectively. A fit with a coherent sum of two Breit-Wigner functions results in a mass of (4218.4(- 4.5)(vertical bar 5.5) +/- 0.9) MeV/ c(2) and a width of (66.0(- 8.3)(vertical bar 12.3) +/- 0.4) MeV for the Y(4220), and a mass of (4391.5(- 6.8)(+6.3) +/- 1.0) MeV/c(2) and a width of (139.5(- 20.6)(+16.2) +/- 0.6) MeV for the Y(4390), where the first uncertainties are statistical and the second ones systematic. The statistical significance of Y(4220) and Y(4390) is 10 sigma over one structure assumption.

https://doi.org/10.1103/physrevlett.118.092002