6533b831fe1ef96bd1298393

RESEARCH PRODUCT

Measurement of the Absolute Branching Fraction forΛc+→Λe+νe

X. K. ChuYu ZhangA. Q. GuoY. J. MoL. P. ZhouZ. GaoX. FangZ. P. MaoW. M. SongE. H. ThorndikeH. P. ChengFeng LiuShan WangJ. FangTao LiXiao-rui LyuF. LiChi ZhangH. S. ChenD. J. AmbroseM. H. YeW. P. WangM. AblikimL. Q. QinF. FeldbauerPeilian LiuLingxuan ZhangF. C. MaI. UmanCh. RosnerC. DongS. SosioZ. H. QinC. LengT. WeberQ. P. JiX. R. ChenJ. M. BianZhenyu ZhangL. D. LiuL. Y. DongG. S. VarnerH. LiangTao LuoJ. Z. BaiJoachim PetterssonX. C. ChenBibo KeY. H. GuanLiqing XuKai LiuX. Y. ShenV. SantoroM. AlbrechtW. G. LiH. L. MaD. M. LiQ. P. JiW. B. YanM. N. AchasovW. J. ZhengW. D. LiB. X. YuJ. C. ChenXuanhong LouX. M. LiY. DingNasser Kalantar-nayestanakiS. SpataroA. CalcaterraZ. G. ZhaoX. P. XuM. H. GuD. BettoniJ. F. QiuZhi ZengL. FavaM. PelizaeusGiulietto FeliciS. SchumannS. PacettiH. Y. ShengYao WangC. Morales MoralesX. LiuJ. Q. ZhangY. NefedovX. B. JiY. J. MaoJ. L. ZhangR. PolingZhiqing LiuCui LiH. R. QiB. J. LiuLei. LiH. M. LiuI. TapanJ. Y. LiuJianping ZhengS. ZhuJin LiZ. J. SunP. PatteriC. X. YuZ. J. XiaoH. H. LiuM. Y. DongM. TiemensJ. C. LiH. J. LuJ. G. LuY. H. YanJ. W. ZhaoY. C. ZhuJ. F. ChangO. B. KolcuI. B. NikolaevZ. A. ZhuG. F. CaoJ. ZhuangH. X. YangI. GarziaJ. H. YinM. G. ZhaoQ. L. XiuQ. GaoY. N. GaoY. ZhangQ. AnX. L. JiShujun ZhaoH. L. DaiIgor BoykoY. X. XiaS. H. ZhuX. N. MaY. T. LiangA. ZalloB. ZhengR. G. PingZ. T. SunZ. A. LiuF. NerlingY. N. ZhangV. PrasadM. X. LuoJ. J. ZhangM. FritschF. E. MaasG. LiM. DestefanisJ. Z. FanX. CaiSerkant Ali CetinW. L. YuanJ. H. ZouL. ZottiYaquan FangS. S. SunJian WeiYucheng HuangD. V. DedovichH. XiaoAndrzej KupscJ. P. LiuM. KavatsyukT. HuZ. G. WangC. HuH. Y. ZhangY. BanE. BogerP. WeidenkaffR. Baldini FerroliM. ShaoY. T. GuK. SchoenningB. S. ZouT. HeldC. P. ShenX. Q. HaoC. D. FuC. Q. FengY. X. YangJ. G. MesschendorpH. B. LiJ. P. DaiX. TangM. L. ChenZ. Y. DengL. XiaGuangming HuangG. F. ChenQ. J. XuA. YuncuD. Y. LiuR. E. MitchellJ. B. JiaoB. X. ZhangQ. OuyangA. G. DenigC. L. LuoY. H. ZhengCong-feng QiaoO. AlbayrakC. C. ZhangK. LiS. P. WenJ. Y. ZhangZ. NingX. K. ZhouY. B. LiuFang LiuX. S. QinX. R. ZhouB. ZhongL. B. GuoQiunan XuE. FioravantiP. X. ShenZ. WuL. W. JiangS. S. FangH. B. LiuG. F. XuI. DenysenkoH. MuramatsuX. L. KangA. SarantsevUlrich WiednerXingguo LiCheng LiA. HafnerM. KornicerX. N. LiQ. ZhaoY. Z. SunZhiqing ZhangHaiping PengYiming ZhangN. Yu. MuchnoiJ. H. LiuX. S. KangB. WangD. H. WeiY. H. ZhangB. Y. ZhangJ. S. LangeT. MaQ. W. ZhaoR. KliemtY. K. HengXiang ZhouP. L. WangY. G. XieP. L. WangKe WangK. J. ZhuJie YuP. LarinX. L. LuoS. JinH. Y. ChenGang ZhaoX. H. MoL. S. WangS. X. DuZ. L. DouMagnus WolkeP. F. DuanFenfen AnM. H. YeK. J. ZhuF. A. HarrisL. L. WangW. P. WangY. F. LiangF. BianchiH. CaiB. L. WangG. CibinettoD. P. JinX. Y. JiangZ. Y. WangT. C. ZhaoGuangshun HuangP. R. LiL. YanO. FedorovJie ZhaoD. X. LinDayong WangN. QinZahra HaddadiAlexey ZhemchugovH. M. HuXian GaoY. PanJ. W. ZhangG. X. SunJ. V. BennettM. UllrichZ. JiaoFu-hu LiuD. H. ZhangY. P. GuoH. H. ZhangZ. P. ZhangG. A. ChelkovD. W. BennettZujian WangS. QianJialun PingK. ZhangX. Y. ZhangM. LaraJ. B. LiuY. GuoM. MaggioraLing ZhaoY. J. SunY. B. ZhaoLei ZhaoW. ShanY. P. LuZ. L. HouYang YangJ. DongD. Y. WangY. Q. WangS. NisarC. J. TangY. HuX. Y. SongY. P. LuC. Z. YuanD. XiaoK. GoetzenW. KuehnJ. F. SunS. MarcelloY. ZengY. B. ChenXiaofeng ZhuJ. Z. ZhangKrisztian PetersY. F. WangG. R. LiaoJ. F. HuT. HussainX. Y. MaW. X. GongJ. MinJ. S. HuangC. X. LiuB. KopfK. L. HeM. Z. WangOrhan CakirP. KieseJimin ZhaoS. L. OlsenRoy A. BriereX. S. JiangM. BertaniL. YangS. L. NiuF. Y. LiX. Q. LiM. GrecoK. Y. LiuW. GradlM. RipkaZ. B. LiTord JohanssonM. QiH. J. YangS. B. LiuF. De MoriX. Y. ZhouX. F. WangQ. M. MaB. KlossX. Y. NiuY. YuanY. S. ZhuXiangdong RuanQ. LiuL. L. MaL. G. XiaA. AmorosoA. DbeyssiA. JulinS. HanL. H. WuM. SavrieX. Y. GaoZ. H. WangC. F. RedmerXiaocong AiX. T. HuangG. RongA. A. ZafarK. H. RashidS. J. ChenW. C. Yan

subject

PhysicsAnnihilation010308 nuclear & particles physicsBranching fractionElectron–positron annihilationTheoretical modelsAnalytical chemistryGeneral Physics and AstronomyLambda baryonLambda01 natural sciencesNuclear physicsBaryonCharmed baryons0103 physical sciencesHigh Energy Physics::Experiment010306 general physics

description

We report the first measurement of the absolute branching fraction for Lambda(+)(c) -> Lambda e(+)nu(e). This measurement is based on 567 pb(-1) of e(+)e(-) annihilation data produced at root s = 4.599 GeV, which is just above the Lambda(+)(c)Lambda(-)(c) threshold. The data were collected with the BESIII detector at the BEPCII storage rings. The branching fraction is determined to be B(Lambda(+)(c) -> Lambda e(+)nu(e)) = [3.63 +/- 0.38(stat) +/- 0.20(syst)] %, representing a significant improvement in precision over the current indirect determination. As the branching fraction for Lambda(+)(c) -> Lambda e(+)nu(e) is the benchmark for those of other Lambda(+)(c) semileptonic channels, our result provides a unique test of different theoretical models, which is the most stringent to date.

https://doi.org/10.1103/physrevlett.115.221805