6533b86cfe1ef96bd12c7f5f

RESEARCH PRODUCT

Precision measurements ofB[ψ(3686)→π+π−J/ψ]andB[J/ψ→l+l−]

Xiao-tong LuX. Q. LiM. GrecoH. L. MaA. ZalloD. M. LiYang QinH. H. ZhangH. MuramatsuX. T. LiaoY. X. XiaX. L. WangM. PelizaeusG. A. ChelkovK. GoetzenW. KuehnK. Y. LiuR. Baldini FerroliL. H. WuM. L. ChenQ. J. XuJ. Q. ZhangD. J. AmbroseY. H. GuanJ. B. WeiJ. C. LiY. J. MaoY.n. GaoA. Q. GuoG. R. LiaoY. NefedovF. F. JingQian LiuW. M. SongJ. ZhuangF. LiX. N. LiP. FriedelM. MaggioraLing ZhaoX. R. ChenHao-ran YuM. X. LuoQ. OuyangF. C. MaE. PrencipeQ. M. MaM. LeyheZ. H. QinM. Y. DongZ. NingD. V. DedovichHaiping PengP. LarinY. ZhangH. B. LiuZ. Y. HeJ. M. BianZ. L. HouY. F. WangS. S. FangZhenyu ZhangB. KlossW. LaiH. J. LuFeng LiuJ. G. LuQ. AnChuan LiuJ. F. SunY. B. LiuYang YangD. Y. WangI. UmanWei WuM. BertaniW. D. LiY. YuanY. S. ZhuA. CalcaterraK. MoriyaX. H. MoL. S. WangF. E. MaasTao LuoJ. H. ZouO. FuksM. H. YeC. S. JiJ. V. BennettH. X. YangS. S. SunY. X. YangT. HuX. Y. MaH. MoeiniM. UllrichW. X. GongCui LiL. L. WangH. CaiShan WangXiangdong RuanY. ZengJ. C. ChenS. J. ChenM. R. ShepherdO. BondarenkoR. ZhangG. F. XuZhenli XuC. Z. YuanHuihui LiuS. JinJ. P. LiuJ. F. QiuI. TapanD. X. LinL. FavaXuanhong LouAlexey ZhemchugovH. M. HuMichael WernerH. LiangY. H. YanB. X. YuZ. P. ZhangNasser Kalantar-nayestanakiZhe SunLei ZhaoJürgen BeckerI. B. NikolaevK. H. RashidM. ShaoY. T. GuQ. ZhaoY. Z. SunQ. P. JiX. K. ZhouC. Morales MoralesJ. W. ZhaoJ. W. ZhangC. H. LiXiang ZhouGuangming HuangZ. WuQingnian XuL. G. XiaQ. J. LiGang ZhaoJ. G. MesschendorpG. S. HuangR. E. MitchellW. G. LiZujian WangW. GradlQ. L. XiuH. S. ChenX. Y. SongS. L. OlsenRoy A. BriereY. B. ChenA. SarantsevD. H. WeiY. T. LiangZ. G. ZhaoJ. S. LangeG. S. VarnerS. SpataroXiaofeng ZhuJ. Z. ZhangS. MaY. DingX. P. XuY. H. ZhengCong-feng QiaoC. ZhuO. AlbayrakM. H. YeY. C. ZhuHang LiuP. L. WangD. TothX. S. JiangE. BogerB. J. LiuY. F. LiangB. SpruckD. P. JinM. KornicerW. B. YanM. N. AchasovM. G. ZhaoShujun ZhaoX. H. ZhaoJ. MinMeng WangYong-feng HuangC. F. RedmerH. M. LiuH. L. DaiIgor BoykoH. B. LiuL. HuangX. L. LuoT. HeldZ. J. SunH. LoehnerB. KopfL. Y. DongZ. G. WangN. Yu. MuchnoiZ. B. LiG. F. CaoX. T. HuangM. AblikimA. A. ZafarH. Y. ZhangHeng-yun YeDayong WangP. L. LiuS. PacettiG. RongO. CakirSanfeng WuK. L. HeY. H. ZhangG. R. LuKe WangG. F. ChenG. X. SunLi YanJ. S. HuangW. M. DingC. X. LiuZ. JiaoFu-hu LiuD. H. ZhangJ. Y. ZhangQ. G. WenZhiqing LiuDaniel P Cronin-hennessyX. L. JiY. B. ZhaoM. KavatsyukK. LiFang LiuJ. W. ParkH. B. LiA. G. DenigC. L. LuoShou-hua ZhuJ. F. ChangZ. A. ZhuZ. Y. WangY. Q. WangM. QiS. P. YuY. K. HengTalib HussainC. C. ZhangB. ZhongL. B. GuoI. DenysenkoC. J. TangP. L. WangY. P. LuKai LiuLei LiB. S. ZouE. H. ThorndikeV. V. BytevUlrich WiednerFenfen AnB. Y. ZhangD. H. SunZhiqiang LiuMiao HeS. BraunL. Q. QinX. CaiX. R. LiY. G. XieJifeng HuT. MaL. P. ZhouZ. P. MaoB. X. ZhangC. P. ShenS. B. LiuH. P. ChengS. X. DuJ. P. DaiJ. FangT. C. ZhaoZhenghao ZhangChangjin ZhangL. L. JiangF. A. HarrisC. GengN. WuKrisztian PetersQ. P. JiS. H. ZhangX. Y. ShenB. Q. WangG. LiC. D. FuC. Q. FengZ. Y. DengXingguo LiJ. Z. BaiS. L. ZangY. P. ChuX. B. JiJie YuT. J. MinK. J. ZhuM. H. GuH. Y. ShengC. X. YuB. ZhengR. G. PingZ. A. LiuY. BanP. WeidenkaffS. P. WenX. S. QinX. R. ZhouJ. L. FuCheng LiY. D. WangQun-yao WangLili ZhangS. QianJialun PingX. Y. ZhangM. LaraY. J. SunX. LiuZ. J. XiaoY. P. GuoT. GuoSerkant Ali CetinJ. B. JiaoXuejun WangC. HuX. TangK. J. ZhuXuantong ZhangQ. A. MalikY. L. HanHongsheng ZhaoR. PolingJianping ZhengM. LvZ. XueM. Destefanis

subject

PhysicsNuclear physicsNuclear and High Energy PhysicsElectron–positron annihilationAnalytical chemistryPiHigh Energy Physics::ExperimentQuarkonium

description

Based on (106.41 +/- 0.86) x 10(6) psi(3686) events collected with the BESIII detector at the BEPCII collider, the branching fractions of psi(3686) -> pi(+)pi(-)J/psi, J/psi -> e(+)e(-), and J/psi -> mu(+)mu(-) are measured. We obtain B[psi(3686) -> pi(+)pi(-)J/psi] = (34.98 +/- 0.02 +/- 0.45)%, B[J/psi -> e(+)e(-)] = (5.983 +/- 0.007 +/- 0.037)%, and B[J/psi -> mu(+)mu(-)] = (5.973 +/- 0.0007 +/- 0.038)%. The measurement of B[psi(3686) -> pi(+)pi(-)J/psi] confirms the CLEO-c measurement, and is apparently larger than the others. The measured J/psi leptonic decay branching fractions agree with previous experiments within one standard deviation. These results lead to B[J/psi -> l(+)l(-)] = (5.978 +/- 0.005 +/- 0.040)% by averaging over the e(+)e(-) and mu(+)mu(-) channels and a ratio of B[J/psi -> e(+)e(-)]/B[J/psi -> mu(+)mu(-)] = 1.0017 +/- 0.0017 +/- 0.0033, which tests e- mu universality at the four tenths of a percent level. All the measurements presented in this paper are the most precise in the world to date.

https://doi.org/10.1103/physrevd.88.032007