6533b861fe1ef96bd12c573a
RESEARCH PRODUCT
Observation of an Anomalous Line Shape of theη′π+π−Mass Spectrum near thepp¯Mass Threshold inJ/ψ→γη′π+π−
S. L. NiuF. Y. LiS. SchumannX. Q. LiM. GrecoTao LuoYao WangS. AhmedJ. M. BianK. LiY. X. YangH. H. LiuX. K. ZhouZhenyu ZhangS. J. ZhaoJ. C. LiZ. NingFang LiuB. X. YuBingxuan LiuZhi ZengK. Y. LiuJ. ZhuangI. DenysenkoG. LiM. X. LuoC. LengA. HafnerQ. ZhaoM. H. YeZ. B. LiJian WeiYucheng HuangD. V. DedovichJ. MinC. D. FuB. KopfY. J. MaoH. X. YangI. UmanK. L. HeC. Q. FengJ. C. ChenXuanhong LouX. R. ChenH. S. ChenH. L. DaiIgor BoykoM. QiH. J. YangM. Z. WangI. GarziaZ. Y. DengJimin ZhaoB. Y. ZhangF. De MoriS. B. LiuNasser Kalantar-nayestanakiX. K. ChuY. Z. SunXiang ZhouG. F. XuL. D. LiuS. JinX. N. MaY. H. GuanKai LiuM. BertaniJ. Q. ZhangZ. HaddadiL. Y. DongL. YangC. Morales MoralesZhiqing LiuP. LarinA. ZalloXingguo LiGang ZhaoW. GradlJ. P. LiuY. DingB. J. LiuY. GuoJun-yi ZhangY. P. GuoY. F. WangC. DongS. SosioT. JohanssonJ. F. ChangJ. H. LiuPeilian LiuLingxuan ZhangKe WangT. HussainX. Y. MaJin LiW. X. GongO. B. KolcuX. CaiJoachim PetterssonR. FarinelliM. RipkaD. Y. WangW. KühnM. FritschM. KavatsyukX. Q. HaoJ. G. MesschendorpJ. P. DaiY. NefedovX. Y. SongZ. P. ZhangH. J. LuJ. G. LuH. L. MaD. M. LiW. J. ZhengZ. A. ZhuP. F. DuanXian GaoKrisztian PetersX. Y. ZhouH. B. LiA. G. DenigC. L. LuoC. C. ZhangB. ZhongL. B. GuoFenfen AnQiunan XuM. ShiYunlong ZhangI. TapanY. H. YanX. H. SunD. W. BennettZujian WangP. KieseB. L. WangM. PelizaeusS. HanM. G. ZhaoR. P. GuoC. P. ShenD. BettoniP. L. WangBibo KeT. C. ZhaoW. B. YanM. H. GuShan WangXiao-rui LyuJ. L. ZhangH. MuramatsuJie ZhaoD. X. LinT. HoltmannR. PolingS. L. OlsenQ. A. MalikG. MezzadriA. Q. GuoJ. W. ZhaoRoy A. BriereY. N. ZhangL. J. WuX. F. WangO. FedorovX. S. JiangAlexey ZhemchugovH. M. HuM. N. AchasovUlrich WiednerH. Y. ShengW. M. SongCui LiX. LiuC. X. YuQ. M. MaB. KlossK. GoetzenJianping ZhengS. ZhuM. KornicerB. X. ZhangJ. Y. LiuGuangshun HuangL. YanZ. G. WangH. Y. ZhangY. J. MoGiulietto FeliciS. PacettiO. CakirX. Y. NiuH. R. QiZ. J. XiaoR. Baldini FerroliW. C. YanT. MaYanping HuangJ. W. ZhangX. FangQ. GaoY. N. GaoY. ZhangQ. AnQ. J. XuG. S. VarnerH. S. ChenF. A. HarrisH. LeithoffB. ZhengJ. J. ZhangM. DestefanisL. ZottiC. HuR. G. PingZ. T. SunF. E. MaasT. HuZ. L. HuangJ. Z. FanFeng LiuL. XiaY. C. ZhuW. P. WangT. WeberZ. A. LiuY. YuanY. S. ZhuF. LiZ. H. QinG. R. LiaoJ. F. HuX. TangY. X. XiaS. H. ZhuM. AblikimG. F. ChenG. A. ChelkovF. C. MaV. PrasadA. CalcaterraZ. G. ZhaoP. X. ShenSerkant Ali CetinJ. Y. ZhangQ. P. JiXiangdong RuanM. Y. DongA. YuncuSi ChenL. H. WuM. SavrieQ. LiuZ. WuY. BanL. W. JiangJ. J. XuX. N. LiMagnus WolkeP. WeidenkaffF. H. HeinsiusX. Y. GaoH. XiaoE. BogerYu ZhangY. F. LiangW. G. LiLiqing XuX. Y. ShenM. TiemensH. H. ZhangHaiping PengS. QianZhiqing ZhangJialun PingM. MaggioraLing ZhaoJ. F. QiuK. ZhangT. HeldL. L. MaY. B. LiH. B. LiuD. P. JinS. P. WenZ. J. SunH. LoehnerLei ZhaoL. FavaL. GongX. Y. ZhangK. J. ZhuX. S. QinZ. L. HouJ. S. HuangX. R. ZhouF. NerlingL. G. XiaA. AmorosoL. P. ZhouX. L. JiC. X. LiuS. SpataroX. P. XuDayong WangN. QinY. Y. LiuA. A. ZafarY. K. HengM. LaraJ. B. LiuXiaozhong HuangCheng LiD. J. AmbroseJ. H. ZouY. J. SunLei LiA. DbeyssiY. M. MaK. H. RashidY. P. LuH. M. LiuC. Z. YuanAndrzej KupscW. L. YuanY. T. LiangZ. P. MaoS. J. ChenS. S. SunA. JulinChi ZhangM. L. ChenYanwei WangD. Y. LiuJ. B. JiaoG. F. CaoM. AlbrechtY. G. XieS. Q. ZhangW. D. LiZ. H. WangP. MusiolC. F. RedmerXiaocong AiC. SchnierS. X. DuZ. L. DouJ. F. SunX. T. HuangG. RongH. P. ChengJ. FangTao LiS. MarcelloY. ZengR. E. MitchellZ. GaoY. B. ChenXiaofeng ZhuJ. Z. ZhangCh. RosnerYaquan FangK. SchoenningQ. Y. LiB. S. ZouNiklaus BergerP. L. WangX. L. LuoH. LiangQ. P. JiW. P. WangF. BianchiH. J. LiQ. L. XiuQ. OuyangS. S. FangI. B. NikolaevY. B. LiuJ. H. YinM. ShaoY. T. GuE. FioravantiX. L. KangA. SarantsevD. H. WeiJ. S. LangeQ. W. ZhaoX. H. MoL. S. WangM. H. YeL. L. WangH. CaiY. B. ZhaoW. ShanJ. DongY. Q. WangS. NisarC. J. TangY. HuY. P. LuB. WangD. XiaoX. Y. JiangM. M. MaP. R. LiY. PanG. X. SunJ. V. BennettZ. JiaoFu-hu LiuD. H. ZhangY. H. ZhengCong-feng QiaoO. AlbayrakN. Yu. MuchnoiX. S. KangY. H. ZhangZ. Y. WangE. H. ThorndikeL. Q. QinF. FeldbauerX. C. ChenJ. Z. BaiX. B. JiP. PatteriR. KliemtJie YuT. J. MinK. J. ZhuG. Cibinettosubject
Quantum chromodynamicsPhysics010308 nuclear & particles physicsGlueballElectron–positron annihilationGeneral Physics and Astronomy01 natural sciencesNuclear physicsAmplitude0103 physical sciencesBound statePiMass spectrumHigh Energy Physics::ExperimentInvariant mass010306 general physicsdescription
Using 1.09 x 10(9) J/psi events collected by the BESIII experiment in 2012, we study the J / psi -> gamma eta'pi(+)pi(-) process and observe a significant abrupt change in the slope of the eta'pi(+)pi(-) invariant mass distribution at the proton-antiproton (p (p) over bar) mass threshold. We use two models to characterize the eta'pi(+)pi(-) line shape around 1.85 GeV/c(2): one that explicitly incorporates the opening of a decay threshold in the mass spectrum (Flatte formula), and another that is the coherent sum of two resonant amplitudes. Both fits show almost equally good agreement with data, and suggest the existence of either a broad state around 1.85 GeV/c(2) with strong couplings to the c final states or a narrow state just below the p (p) over bar mass threshold. Although we cannot distinguish between the fits, either one supports the existence of a p (p) over bar moleculelike state or bound state with greater than 7 sigma significance.
year | journal | country | edition | language |
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2016-07-21 | Physical Review Letters |