6533b829fe1ef96bd128ab12

RESEARCH PRODUCT

Measurement of higher-order multipole amplitudes in ψ(3686)→γχc1,2 with χc1,2→γJ/ψ and search for the transition ηc(2S)→γJ/ψ

J. M. BianS. J. ZhaoD. Y. LiuJ. B. JiaoX. H. MoL. S. WangM. MaggioraLing ZhaoY. DingM. H. YeQ. J. XuR. KliemtX. K. ZhouFang LiuLei ZhaoZ. L. HouH. B. LiA. G. DenigB. J. LiuJie YuG. FeliciTao LuoYunlong ZhangJ. C. ChenXuanhong LouS. Q. ZhangK. J. ZhuC. L. LuoI. DenysenkoJ. MinG. CibinettoL. L. WangNasser Kalantar-nayestanakiF. De MoriZ. T. SunH. CaiC. Morales MoralesBingxuan LiuC. C. ZhangB. X. YuB. ZhongL. B. GuoD. BettoniW. KühnG. LiJ. Z. BaiJie ZhaoB. KopfC. D. FuC. Q. FengD. X. LinX. R. ChenY. H. GuanX. B. JiM. TiemensZ. Y. DengP. PatteriX. Y. ZhouZhi ZengH. M. HuB. Y. ZhangXingguo LiH. LiangJ. L. ZhangH. MuramatsuUlrich WiednerI. B. NikolaevI. B. NikolaevZ. A. LiuK. L. HeC. Z. YuanX. N. MaKai LiuZ. A. ZhuJ. H. YinQ. P. JiH. J. LiR. PolingK. H. RashidI. TapanY. H. YanS. J. ChenZ. G. WangM. Z. WangY. T. LiangM. ShaoY. T. GuH. S. ChenH. Y. ZhangX. L. JiA. ZalloJianping ZhengT. MaQ. L. XiuS. ZhuJimin ZhaoJ. W. ZhaoJ. W. ZhangE. H. ThorndikeS. B. LiuV. PrasadX. F. WangQ. M. MaH. L. DaiIgor BoykoM. Y. DongY. BanP. WeidenkaffE. FioravantiY. C. ZhuG. A. ChelkovG. A. ChelkovG. A. ChelkovY. NefedovG. F. ChenB. KlossX. LiuC. LengH. R. QiJ. Y. ZhangTalib HussainC. P. ShenH. XiaoH. B. LiuL. Q. QinJ. J. LiangM. BertaniX. Y. NiuX. L. KangA. SarantsevA. SarantsevA. CalcaterraZ. G. ZhaoY. YuanY. S. ZhuM. FritschZ. H. WangS. P. WenZ. HaddadiJ. H. ZouGuangshun HuangG. MezzadriW. C. YanL. YanD. H. WeiP. R. LiJ. S. LangeQ. W. ZhaoT. HeldR. Baldini FerroliYu ZhangL. J. WuL. YangJ. J. ZhangM. KavatsyukF. FeldbauerM. H. YeX. S. QinX. R. ZhouH. H. ZhangG. F. XuS. S. SunS. JinY. K. HengY. X. XiaS. H. ZhuY. J. MoC. F. RedmerXiaocong AiSerkant Ali CetinQ. OuyangM. N. AchasovM. N. AchasovL. P. ZhouM. DestefanisY. M. MaZ. J. SunH. LoehnerD. J. AmbroseS. S. FangQ. LiuJin LiL. D. LiuZ. P. MaoA. YuncuA. YuncuA. ZhemchugovA. ZhemchugovY. B. LiuCheng LiS. QianX. T. HuangA. A. ZafarCui LiL. Y. DongR. E. MitchellG. RongW. GradlL. L. MaQ. AnJialun PingJ. Q. ZhangB. X. ZhangK. ZhangM. RipkaH. P. ChengJ. FangTao LiH. S. ChenT. WeberL. GongX. N. LiY. G. XieX. Y. ZhangP. L. WangJ. C. LiL. G. XiaA. AmorosoM. AlbrechtD. Y. WangM. QiZ. GaoW. J. ZhengX. C. ChenX. L. LuoM. LaraJ. ZhuangJ. B. LiuH. J. YangS. X. DuBibo KeH. J. LuJ. G. LuW. B. YanM. X. LuoQ. P. JiY. J. SunC. HuX. TangX. Y. SongX. FangI. UmanCh. RosnerA. DbeyssiJian WeiYuyi WangYuyi WangYucheng HuangHaiping PengD. V. DedovichE. BogerE. BogerS. HanW. D. LiY. P. LuXichao RuanZ. L. DouW. P. WangF. E. MaasT. HuM. H. GuLiqing XuM. KornicerF. BianchiX. Y. ShenZ. L. HuangFeng LiuYaquan FangS. PacettiH. Y. ShengA. JulinM. G. ZhaoR. P. GuoM. AblikimK. GoetzenJ. H. LiuKe LiP. LarinC. X. YuY. N. ZhangS. Z. ChenL. H. WuP. X. ShenZ. WuM. SavrieL. W. JiangKe WangShan WangXiao-rui LyuB. ZhengR. G. PingZhiqing ZhangS. SchumannX. K. ChuK. J. ZhuYao WangK. SchoenningQ. Y. LiB. S. ZouP. F. DuanPeilian LiuJ. J. XuX. Y. GaoL. XiaY. B. LiLingxuan ZhangY. H. ZhengZhiyong ZhangX. L. GaoCong-feng QiaoO. AlbayrakJ. S. HuangFenfen AnC. X. LiuB. L. WangN. Yu. MuchnoiN. Yu. MuchnoiT. C. ZhaoO. FedorovG. S. VarnerMagnus WolkeY. F. LiangX. S. KangY. H. ZhangD. P. JinY. F. WangC. DongKrisztian PetersS. SosioDayong WangN. QinX. Y. MaW. X. GongXiaozhong HuangAndrzej KupscW. L. YuanX. H. SunM. L. ChenS. L. NiuF. Y. LiX. Q. LiM. GrecoJoachim PetterssonY. N. GuoM. UllrichZ. J. XiaoK. Y. LiuZ. B. LiZ. Y. WangP. KieseG. R. LiaoJ. F. HuS. L. OlsenR. A. BriereX. S. JiangO. CakirJ. F. SunS. MarcelloY. ZengY. B. ChenXiaofeng ZhuJ. Z. ZhangL. ZottiF. A. HarrisChi ZhangZ. NingZhiqing LiuX. P. XuX. P. XuT. JohanssonJ. F. ChangO. B. KolcuO. B. KolcuX. CaiX. Q. HaoP. L. WangA. Q. GuoW. M. SongH. LeithoffF. LiW. P. WangF. C. MaZ. H. QinY. J. MaoH. X. YangI. GarziaJ. F. QiuHuihui LiuJ. P. LiuL. FavaJ. G. MesschendorpJ. P. DaiF. NerlingQiunan XuM. ShiW. G. LiX. M. LiS. SpataroLei LiH. M. LiuG. F. CaoY. X. YangA. HafnerQ. ZhaoY. Z. SunXiang ZhouGang ZhaoJ. Y. LiuJun-yi ZhangY. P. GuoQ. GaoY. N. GaoZ. P. ZhangY. ZhangD. W. BennettZujian WangJ. Z. FanY. B. ZhaoW. ShanR. FarinelliJ. DongY. Q. WangH. L. MaD. M. LiS. NisarC. J. TangY. HuY. P. LuM. PelizaeusB. WangD. XiaoX. Y. JiangM. M. MaY. PanG. X. SunJ. V. BennettZ. JiaoFu-hu LiuD. H. Zhang

subject

PhysicsAmplitude010308 nuclear & particles physicsBranching fractionAstrophysics::High Energy Astrophysical PhenomenaElectron–positron annihilation0103 physical sciencesAnalytical chemistryHigh Energy Physics::Experiment010306 general physicsMultipole expansion01 natural sciencesGamma gamma

description

Using 106 x 10(6) psi(3686) events collected with the BESIII detector, we measure multipole amplitudes for the decay psi(3686) ->; gamma chi(c1,2) -> gamma gamma J/psi beyond the dominant electric-dipole amplitudes. The normalized magnetic-quadrupole (M2) amplitude for psi(3686) -> gamma chi(c1,2) -> gamma gamma J/psi and the normalized electric-dipole amplitudes for psi(3686) -> gamma chi(c2) -> gamma J/psi and determined. The M2 amplitudes for psi(3686) -> gamma chi(c1) and ; chi(c1,2) -> gamma J/psi are found to differ significantly from zero and are consistent with theoretical predictions. We also obtain the ratios of M2 contributions of psi(3686) and J/psi decays to;2,chi(c1,2,) b(2)(1/)b(2)(2) = 1.35 +/- 0.72 and a(2)(1/)a(2)(2) = 0.617 +/- 0.083,,which agree well with theoretical expectations. By considering the multipole contributions of chi(c1,2), we measure the product branching fractions for the cascade decays psi(3686) -> gamma chi(c 0,1,2) -> gamma gamma J/psi and search for the process eta(c)(2s) -> gamma J/psi through psi(3686) -> gamma eta(c)(2s).The product branching fraction for psi(3686) -> gamma chi(c0) -> gamma gamma J/psi is 3 sigma larger than published measurements, while those of psi(3686) -> gamma chi(c1,2) -> gamma gamma J/psi are consistent. No significant signal for the decay psi(3686) -> gamma eta(c) (2s) -> gamma gamma J/psi is observed, and the upper limit of the product branching fraction at the 90% confidence level is determined.

https://doi.org/10.1103/physrevd.95.072004