6533b838fe1ef96bd12a4295

RESEARCH PRODUCT

Measurement of $\eta^\prime\rightarrow \pi^+\pi^- e^+e^-$ and $\eta^\prime\rightarrow \pi^+\pi^-\mu^+\mu^-$

Besiii CollaborationM. AblikimM. N. AchasovO. AlbayrakD. J. AmbroseF. F. AnQ. AnJ. Z. BaiR. Baldini FerroliY. BanJ. BeckerJ. V. BennettM. BertaniJ. M. BianE. BogerO. BondarenkoI. BoykoR. A. BriereV. BytevH. CaiX. CaiO. AkirA. CalcaterraG. F. CaoS. A. CetinJ. F. ChangG. ChelkovG. ChenH. S. ChenJ. C. ChenM. L. ChenS. J. ChenX. ChenY. B. ChenH. P. ChengY. P. ChuD. Cronin-hennessyH. L. DaiJ. P. DaiD. DedovichZ. Y. DengA. DenigI. DenysenkoM. DestefanisW. M. DingY. DingL. Y. DongM. Y. DongS. X. DuJ. FangS. S. FangL. FavaC. Q. FengP. FriedelC. D. FuJ. L. FuY. GaoC. GengK. GoetzenW. X. GongW. GradlM. GrecoM. H. GuY. T. GuY. H. GuanA. Q. GuoL. B. GuoT. GuoY. P. GuoY. L. HanF. A. HarrisK. L. HeM. HeZ. Y. HeT. HeldY. K. HengZ. L. HouC. HuH. M. HuJ. F. HuT. HuG. M. HuangG. S. HuangJ. S. HuangL. HuangX. T. HuangY. HuangY. P. HuangT. HussainC. S. JiQ. JiQ. P. JiX. B. JiX. L. JiL. L. JiangX. S. JiangJ. B. JiaoZ. JiaoD. P. JinS. JinF. F. JingN. Kalantar-nayestanakiM. KavatsyukB. KopfM. KornicerW. KuehnW. LaiJ. S. LangeP. LarinM. LeyheC. H. LiCheng LiCui LiD. M. LiF. LiG. LiH. B. LiJ. C. LiK. LiLei LiQ. J. LiS. L. LiW. D. LiW. G. LiX. L. LiX. N. LiX. Q. LiX. R. LiZ. B. LiH. LiangY. F. LiangY. T. LiangG. R. LiaoX. T. LiaoD. LinB. J. LiuC. L. LiuC. X. LiuF. H. LiuFang LiuFeng LiuH. LiuH. B. LiuH. H. LiuH. M. LiuH. W. LiuJ. P. LiuK. LiuK. Y. LiuKai LiuP. L. LiuQ. LiuS. B. LiuX. LiuY. B. LiuZ. A. LiuZhiqiang LiuZhiqing LiuH. LoehnerG. R. LuH. J. LuJ. G. LuQ. W. LuX. R. LuY. P. LuC. L. LuoM. X. LuoT. LuoX. L. LuoM. LvC. L. MaF. C. MaH. L. MaQ. M. MaS. MaT. MaX. Y. MaF. E. MaasM. MaggioraQ. A. MalikY. J. MaoZ. P. MaoJ. G. MesschendorpJ. MinT. J. MinR. E. MitchellX. H. MoH. MoeiniC. Morales MoralesK. MoriyaN. Yu. MuchnoiH. MuramatsuY. NefedovC. NicholsonI. B. NikolaevZ. NingS. L. OlsenQ. OuyangS. PacettiJ. W. ParkM. PelizaeusH. P. PengK. PetersJ. L. PingR. G. PingR. PolingE. PrencipeM. QiS. QianC. F. QiaoL. Q. QinX. S. QinY. QinZ. H. QinJ. F. QiuK. H. RashidG. RongX. D. RuanA. SarantsevB. D. SchaeferM. ShaoC. P. ShenX. Y. ShenH. Y. ShengM. R. ShepherdW. M. SongX. Y. SongS. SpataroB. SpruckD. H. SunG. X. SunJ. F. SunS. S. SunY. J. SunY. Z. SunZ. J. SunZ. T. SunC. J. TangX. TangI. TapanE. H. ThorndikeD. TothM. UllrichI. UmanG. S. VarnerB. Q. WangD. WangD. Y. WangK. WangL. L. WangL. S. WangM. WangP. WangP. L. WangQ. J. WangS. G. WangX. F. WangX. L. WangY. D. WangY. F. WangY. Q. WangZ. WangZ. G. WangZ. Y. WangD. H. WeiJ. B. WeiP. WeidenkaffQ. G. WenS. P. WenM. WernerU. WiednerL. H. WuN. WuS. X. WuW. WuZ. WuL. G. XiaY. X XiaZ. J. XiaoY. G. XieQ. L. XiuG. F. XuG. M. XuQ. J. XuQ. N. XuX. P. XuZ. R. XuF. XueZ. XueL. YanW. B. YanY. H. YanH. X. YangY. YangY. X. YangH. YeM. YeM. H. YeB. X. YuC. X. YuH. W. YuJ. S. YuS. P. YuC. Z. YuanY. YuanA. A. ZafarA. ZalloS. L. ZangY. ZengB. X. ZhangB. Y. ZhangC. ZhangC. C. ZhangD. H. ZhangH. H. ZhangH. Y. ZhangJ. Q. ZhangJ. W. ZhangJ. Y. ZhangJ. Z. ZhangLili ZhangR. ZhangS. H. ZhangX. J. ZhangX. Y. ZhangY. ZhangY. H. ZhangZ. P. ZhangZ. Y. ZhangZhenghao ZhangG. ZhaoH. S. ZhaoJ. W. ZhaoK. X. ZhaoLei ZhaoLing ZhaoM. G. ZhaoQ. ZhaoS. J. ZhaoT. C. ZhaoX. H. ZhaoY. B. ZhaoZ. G. ZhaoA. ZhemchugovB. ZhengJ. P. ZhengY. H. ZhengB. ZhongL. ZhouX. ZhouX. K. ZhouX. R. ZhouC. ZhuK. ZhuK. J. ZhuS. H. ZhuX. L. ZhuY. C. ZhuY. M. ZhuY. S. ZhuZ. A. ZhuJ. ZhuangB. S. ZouJ. H. Zou

subject

Astrophysics::High Energy Astrophysical PhenomenaHigh Energy Physics::ExperimentNuclear ExperimentAstrophysics::Galaxy AstrophysicsHigh Energy Physics - Experiment

description

Based on a sample of 225.3 million J/\psi events accumulated with the BESIII detector at the BEPCII, the decays of \eta' to pi+pi-l+l- are studied via J/\psi to \gamma\eta'. A clear \eta' signal is observed in the pi+pi-e+e- mass spectrum, and the branching fraction is measured to be \BR(\eta' to pi+pi-e+e-) = (2.11\pm0.12 (stat.)\pm0.15 (syst.))\times10^{-3}, which is in good agreement with theoretical predictions and the previous measurement, but is determined with much higher precision. No \eta' signal is found in the pi+ pi- mu+ mu- mass spectrum, and the upper limit is determined to be \BR(\eta' to pi+ pi- mu+ mu-)<2.9\times10^{-5} at the 90% confidence level.

10.1103/physrevd.87.092011http://arxiv.org/abs/1303.7360