6533b856fe1ef96bd12b25b1

RESEARCH PRODUCT

Evidence forηc→γγand measurement ofJ/ψ→3γ

F. LiF. C. MaKe WangM. H. YeL. H. WuV. V. BytevI. TapanS. L. LiY. H. YanJ. W. ZhaoC. S. JiL. Y. DongX. Q. HaoA. CalcaterraZ. G. ZhaoX. H. MoL. S. WangM. H. YeFenfen AnL. L. WangT. C. ZhaoRui ZhangD. Cronin-hennessyY. C. ZhuH. LiangQ. P. JiY. J. MaoQ. M. MaW. M. DingJ. F. QiuL. FavaM. H. GuI. B. NikolaevK. H. RashidM. ShaoY. T. GuT. HeldQ. J. LiX. LiuY. L. HanY. YuanY. S. ZhuZ. J. XiaoC. MotzkoJ. M. BianZhenyu ZhangW. LaiZ. J. SunH. LoehnerH. Y. ShengC. X. YuZ. H. AnX. T. LiaoY. P. GuoA. SarantsevD. H. WeiJ. S. LangeShan WangK. LiFang LiuJ. Z. BaiJ. F. SunXiangdong RuanY. DingSerkant Ali CetinJulian SchulzeQ. J. XuY. M. ZhuHongsheng ZhaoQ. LiuB. ZhengR. G. PingShou-hua ZhuY. N. GaoY. ZhangQ. AnR. PolingJ. B. JiaoZ. A. LiuX. N. LiHaiping PengB. J. LiuH. B. LiJoong-won ParkI. DenysenkoY. P. ChuJ. ZhongA. G. DenigC. L. LuoTao LuoJ. V. BennettJianping ZhengL. G. XiaWei WuA. ZhemchugovA. ZhemchugovJ. C. ChenG. S. VarnerKai LiuHang LiuY. BanP. WeidenkaffX. B. JiB. X. YuW. G. LiNasser Kalantar-nayestanakiS. J. ChenO. BondarenkoY. B. ZhaoB. S. ZouD. J. AmbroseM. QiS. MaM. LvC. C. ZhangB. ZhongL. B. GuoG. R. LuY. ZengZhe SunLei LiD. TothS. P. WenC. Morales MoralesH. S. ChenX. S. QinX. R. ZhouShujun ZhaoZhiqiang LiuMiao HeXiao-tong LuH. L. DaiIgor BoykoXiao Dong ChenUlrich WiednerZ. XueJifeng HuM. DestefanisL. P. ZhouCheng LiS. SpataroB. Y. ZhangE. PrencipeH. M. HuT. MaYanping HuangY. H. ZhengXiaobo ZhuCong-feng QiaoY. B. ChenX. P. XuP. L. WangQi-wen LüZ. P. MaoH. L. MaXuejun WangD. M. LiJie YuX. TangC. ZhuH. P. ChengZ. A. ZhuJ. FangW. D. LiX. L. JiS. P. YuG. A. ChelkovG. A. ChelkovJ. C. LiXiaofeng ZhuJ. Z. ZhangC. J. TangY. NefedovJ. ZhuangH. MuramatsuY. P. LuKai LiuN. Yu. MuchnoiT. J. MinM. G. ZhaoHeng-yun YeD. H. SunTalib HussainH. M. LiuM. X. LuoSanfeng WuFeng XueCui LiS. QianJialun PingX. Y. ZhangJ. S. HuangD. V. DedovichK. J. ZhuB. D. SchaeferC. X. LiuM. PelizaeusX. T. HuangA. A. ZafarJ. W. ZhangG. RongY. H. ZhangQun-yao WangY. G. XieG. F. CaoS. B. LiuN. WuZhenli XuKrisztian PetersQ. G. WenK. J. ZhuY. J. SunE. BogerE. BogerXuantong ZhangW. B. YanZ. Y. WangS. X. DuJ. MinM. N. AchasovH. B. LiuH. X. YangG. LiF. FeldbauerS. PacettiB. SpruckE. H. ThorndikeK. L. HeZ. G. WangH. Y. ZhangZ. P. ZhangG. F. XuC. D. FuC. Q. FengM. Z. WangX. H. LiuL. Q. QinZ. Y. DengQ. A. MalikFeng LiuA. ZalloM. Y. DongQ. P. JiH. B. LiuZujian WangM. BertaniHuihui LiuS. JinJ. P. DaiB. Q. WangG. F. ChenXingguo LiJ. Y. ZhangJ. H. ZouJ. P. LiuC. L. MaS. S. SunYang QinJ. G. MesschendorpS. H. ZhangX. Y. ShenX. H. ZhaoC. P. ShenC. P. ShenW. GradlJürgen BeckerX. Y. SongR. E. MitchellQiunan XuC. GengM. AblikimA. Q. GuoY. K. HengG. X. SunLi YanK. GoetzenW. KuehnZ. JiaoFu-hu LiuD. H. ZhangZ. H. QinChuan LiuY. T. LiangZ. B. LiM. KavatsyukB. X. ZhangYao WangG. R. LiaoF. F. JingQ. OuyangS. S. FangY. B. LiuP. L. WangX. L. LuoY. H. GuanQ. L. XiuC. NicholsonM. UllrichX. L. WangZ. NingM. L. ChenY. F. WangR. B. FerroliY. F. LiangX. K. ZhouD. P. JinX. Y. MaDayong WangP. L. LiuW. X. GongL. L. JiangC. H. LiH. J. LuJ. G. LuF. E. MaasT. HuMichael WernerGuangming HuangZ. WuM. MaggioraLing ZhaoF. A. HarrisLei ZhaoZ. Y. HeJ. Q. ZhangZ. L. HouYang YangS. L. OlsenRoy A. BriereZhiqing LiuG. M. XuX. S. JiangC. Z. YuanJ. F. ChangX. CaiX. R. LiGuangshun HuangO. CakirH. H. ZhangX. Q. LiM. GrecoK. Y. LiuK. X. ZhaoY. X. YangM. R. ShepherdQ. ZhaoY. Z. SunGang Zhao

subject

PhysicsNuclear and High Energy PhysicsPhotonBranching fractionElectron–positron annihilationAnalytical chemistryHigh Energy Physics::ExperimentPositroniumGamma gamma

description

The decay of J/psi to three photons is studied using psi (3686) -> pi(+) pi(-) J/psi in a sample of 1.0641 X 10(8) psi (3686) events collected with the BESIII detector. Evidence of the direct decay of eta(c) to two photons, eta(c) -> gamma gamma, is reported, and the product branching fraction is determined to be B(J/psi -> gamma eta(c,) eta(c) -> gamma gamma = (4.5 +/- 1.2 +/- 0.6) X 10(-6), where the first error is statistical and the second is systematic. The branching fraction for J/psi -> 3 gamma is measured to be (11.3 +/- 1.8 +/- 2.0) X 10(-6) with improved precision. DOI: 10.1103/PhysRevD.87.032003

https://doi.org/10.1103/physrevd.87.032003