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Observations of the Cabibbo-Suppressed decays ■→nπ~+π~0,nπ~+π~-π~+and the Cabibbo-Favored decay ■→nK~-π~+π~+

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【作者】 麦迪娜M.N.AchasovP.AdlarsonM.AlbrechtR.AlibertiA.Amoroso安美儒安琪白羽O.BakinaR.Baldini FerroliI.Balossino班勇V.BatozskayaD.BeckerK.BegzsurenN.BergerM.BertaniD.BettoniF.BianchiE.BiancoJ.BlomsA.BortoneI.BoykoR.A.BriereA.Brueggemann蔡浩蔡啸A.Calcaterra曹国富曹宁S.A.Cetin常劲帆常万玲车国荣G.Chelkov陈琛陈超陈刚陈和生陈玛丽陈申见陈少敏T.Chen陈旭荣X.T.Chen陈元柏陈卓俊成伟帅S.K.Choi初晓G.CibinettovF.Cossio崔佳佳代洪亮代建平A.DbeyssiR.E.de BoerD.Dedovich邓子艳A.DenigI.DenysenkoM.DestefanisF.De Mori丁勇丁逸董静董燎原董明义董翔杜书先段宗欢P.Egorov范玉兰方建房双世方文兴方易R.FarinelliL.Fava69BF.FeldbauerG.Felici封常青冯俊华K FischerM.FritschC.Fritzsch傅成栋高涵高原宁高扬S.GarbolinoI.Garzia葛潘婷葛振武耿聪E.M.GersabeckA GilmanK.Goetzen龚丽龚文煊W.GradlM.Greco谷立民顾旻皓顾运厅关春懿郭爱强郭立波郭如盼郭玉萍A.Guskov韩文颖郝喜庆F.A.Harris何凯凯何康林F.H.HeinsiusC.H.Heinz衡月昆C.Herold侯国一侯颖锐侯治龙胡海明J.F.Hu胡涛胡誉黄光顺黄凯旋黄麟钦黄性涛黄燕萍黄震T.HussainN HüskenW.ImoehlM.IrshadJ.JacksonS.JaegerS.JanchivE.JangJ.H.Jeong纪全姬清平季晓斌季筱璐吉钰瑶贾泽坤姜赛赛江晓山Y.Jiang焦健斌焦铮金山金毅荆茂强T.JohanssonN.Kalantar-Nayestanaki康晓珅R.KappertM.Kavatsyuk柯百谦I.K.KeshkA.KhoukazR.KiuchiR.KliemtL.KochO.B.KolcuB.KopfM.KuemmelM.KuessnerA.KupscW.KühnJ.J.LaneJ.S.LangeP.LarinA.LavaniaL.Lavezzi雷祚弘H.LeithoffM.LellmannT.Lenz李翠李聪李春花李澄李德民李飞李刚李慧李贺李海波李惠静H.N.LiJ.Q.Li李静舒李井文李科L.J Li李龙科李蕾李明浩李培荣李素娴栗帅迎李腾李卫东李卫国李旭红李晓玲李晓宇李彦谷李振轩李紫源梁畅梁昊梁浩梁勇飞梁羽铁廖广睿廖龙洲J.LibbyA.Limphirat林创新林德旭T.Lin刘北江刘成刘春秀D.Liu刘福虎刘芳刘峰G.M.LiuH.Liu刘宏邦刘怀民刘欢欢刘汇慧刘建北刘佳俊刘晶译刘凯刘魁勇刘珂刘亮刘露刘美宏刘佩莲刘倩刘树彬刘桐刘维克刘卫民刘翔刘英刘玉斌刘振安刘智青娄辛丑卢飞翔吕海江吕军光陆小玲卢宇卢云鹏Z.H.Lu罗成林罗民兴罗涛罗小兰吕晓睿吕翌丰马凤才马海龙马连良马明明马秋梅马润秋马瑞廷马骁妍马尧F.E.MaasM.MaggioraS.MaldanerS.MaldeQ.A.MalikA.Mangoni冒亚军毛泽普S.Marcello孟召霞J.G.MesschendorpG.MezzadriH.Miao闵天觉R.E.Mitchell莫晓虎N.Yu.MuchnoiY.NefedovF.NerlingI.B.Nikolaev宁哲S.Nisar牛艳S.L.Olsen欧阳群S.Pacetti潘祥潘越A.PathakP.PatteriM.Pelizaeus彭海平K.Peters平加伦平荣刚S.PluraS.PogodinV.Prasad齐法制齐航漆红荣祁鸣齐天钰钱森钱文斌钱圳乔从丰秦佳佳秦丽清覃潇平秦小帅秦中华邱进发屈三强K.H.RashidC.F.Redmer任旷洁A.RivettiV.RodinM.Rolo荣刚Ch.Rosner阮氏宁A.SarantseY.SchelhaasC.SchnierK.SchoenningM.Scodeggio尚科羽单葳单心钰上官剑锋邵立港邵明沈成平沈宏飞沈肖雁施伯安石煌超石京燕石勤强师荣盛史欣师晓东宋娇娇宋维民宋昀轩S.SosioS.SpataroF.Stieler苏可馨苏彭彭粟杨捷孙功星H.Sun孙浩凯孙俊峰孙亮孙胜森孙童孙文玉孙勇杰孙永昭孙振田谭英华谭雅星唐昌建唐光毅唐健陶璐燕陶秋田M.Tat滕佳秀V.Thoren田文辉田野王斌王滨龙王成伟王大勇王菲王泓鉴王宏鹏王科王亮亮王萌王梦真王蒙王顺王婷王腾蛟王为王文欢王维平王轩王雄飞王小龙王亦王雅迪王贻芳王英豪王雨晴王亚乾王铮王至勇王子一魏代会F.Weidner文硕频D.J.WhiteU.WiednerG.WilkinsonM.WolkeL.Wollenberg吴金飞伍灵慧吴连近吴潇伍雄浩Y.Wu吴英杰吴智夏磊相腾肖栋肖光延肖浩肖素玉肖云龙肖振军谢陈谢昕海谢勇谢宇广谢跃红谢智鹏邢天宇C.F.Xu许创杰许国发许皓月徐庆君徐新平胥英超许泽鹏严芳严亮鄢文标闫文成杨海军杨昊霖杨洪勋杨玲杨涛杨艳芳杨逸翔杨翊凡叶梅叶铭汉殷俊昊尤郑昀俞伯祥喻纯旭余刚于涛余旭东苑长征袁丽S.C.Yuan袁晓庆袁野袁朝阳岳崇兴A.A.Zafar曾凡蕊曾鑫曾云翟星晔詹永华张安庆B.L.Zhang张丙新张丹昊张广义H.Zhang张宏浩张宏宏章红宇张杰磊张敬庆张家文J.X.Zhang张建勇张景芝张剑宇张嘉伟张黎明张丽青张雷P.Zhang张秋岩张水涵张书磊张小东X.M.Zhang张学尧张旭颜张亚腾张银鸿张言张瑶张兆领张振宇张子羽赵光赵静赵静宜赵京周赵雷赵玲赵明刚赵书俊赵豫斌赵宇翔赵政国A.Zhemchugov郑波郑建平郑阳恒钟彬钟翠钟鑫周航周利鹏周详周晓康周小蓉周兴玉周袆卓朱江朱凯朱科军朱琳萱朱世海朱仕强朱腾蛟朱文静朱莹春朱自安邹佳恒

【Author】 M.Ablikim;M.N.Achasov;P.Adlarson;M.Albrecht;R.Aliberti;A.Amoroso;M.R.An;Y.Bai;O.Bakina;R.Baldini Ferroli;I.Balossino;Y.Ban;V.Batozskaya;D.Becker;K.Begzsuren;N.Berger;M.Bertani;D.Bettoni;F.Bianchi;E.Bianco;J.Bloms;A.Bortone;I.Boyko;R.A.Briere;A.Brueggemann;H.Cai;X.Cai;A.Calcaterra;G.F.Cao;N.Cao;S.A.Cetin;J.F.Chang;W.L.Chang;G.R.Che;G.Chelkov;C.Chen;Chao Chen;G.Chen;H.S.Chen;M.L.Chen;S.J.Chen;S.M.Chen;T.Chen;X.R.Chen;X.T.Chen;Y.B.Chen;Z.J.Chen;W.S.Cheng;S.K.Choi;X.Chu;G.Cibinetto;F.Cossio;J.J.Cui;H.L.Dai;J.P.Dai;A.Dbeyssi;R.E.de Boer;D.Dedovich;Z.Y.Deng;A.Denig;I.Denysenko;M.Destefanis;F.De Mori;Y.Ding;Y.Ding;J.Dong;L.Y.Dong;M.Y.Dong;X.Dong;S.X.Du;Z.H.Duan;P.Egorov;Y.L.Fan;J.Fang;S.S.Fang;W.X.Fang;Y.Fang;R.Farinelli;L.Fava;F.Feldbauer;G.Felici;C.Q.Feng;J.H.Feng;K Fischer;M.Fritsch;C.Fritzsch;C.D.Fu;H.Gao;Y.N.Gao;Yang Gao;S.Garbolino;I.Garzia;P.T.Ge;Z.W.Ge;C.Geng;E.M.Gersabeck;A Gilman;K.Goetzen;L.Gong;W.X.Gong;W.Gradl;M.Greco;L.M.Gu;M.H.Gu;Y.T.Gu;C.Y Guan;A.Q.Guo;L.B.Guo;R.P.Guo;Y.P.Guo;A.Guskov;W.Y.Han;X.Q.Hao;F.A.Harris;K.K.He;K.L.He;F.H.Heinsius;C.H.Heinz;Y.K.Heng;C.Herold;G.Y.Hou;Y.R.Hou;Z.L.Hou;H.M.Hu;J.F.Hu;T.Hu;Y.Hu;G.S.Huang;K.X.Huang;L.Q.Huang;X.T.Huang;Y.P.Huang;Z.Huang;T.Hussain;N Hüsken;W.Imoehl;M.Irshad;J.Jackson;S.Jaeger;S.Janchiv;E.Jang;J.H.Jeong;Q.Ji;Q.P.Ji;X.B.Ji;X.L.Ji;Y.Y.Ji;Z.K.Jia;S.S.Jiang;X.S.Jiang;Y.Jiang;J.B.Jiao;Z.Jiao;S.Jin;Y.Jin;M.Q.Jing;T.Johansson;N.Kalantar-Nayestanaki;X.S.Kang;R.Kappert;M.Kavatsyuk;B.C.Ke;I.K.Keshk;A.Khoukaz;R.Kiuchi;R.Kliemt;L.Koch;O.B.Kolcu;B.Kopf;M.Kuemmel;M.Kuessner;A.Kupsc;W.Kühn;J.J.Lane;J.S.Lange;P.Larin;A.Lavania;L.Lavezzi;Z.H.Lei;H.Leithoff;M.Lellmann;T.Lenz;C.Li;C.Li;C.H.Li;Cheng Li;D.M.Li;F.Li;G.Li;H.Li;H.Li;H.B.Li;H.J.Li;H.N.Li;J.Q.Li;J.S.Li;J.W.Li;Ke Li;L.J Li;L.K.Li;Lei Li;M.H.Li;P.R.Li;S.X.Li;S.Y.Li;T.Li;W.D.Li;W.G.Li;X.H.Li;X.L.Li;Xiaoyu Li;Y.G.Li;Z.X.Li;Z.Y.Li;C.Liang;H.Liang;H.Liang;Y.F.Liang;Y.T.Liang;G.R.Liao;L.Z.Liao;J.Libby;A.Limphirat;C.X.Lin;D.X.Lin;B.J.Liu;C.Liu;C.X.Liu;D.Liu;F.H.Liu;Fang Liu;Feng Liu;G.M.Liu;H.Liu;H.B.Liu;H.M.Liu;Huanhuan Liu;Huihui Liu;J.B.Liu;J.L.Liu;J.Y.Liu;K.Liu;K.Y.Liu;Ke Liu;L.Liu;Lu Liu;M.H.Liu;P.L.Liu;Q.Liu;S.B.Liu;T.Liu;W.K.Liu;W.M.Liu;X.Liu;Y.Liu;Y.B.Liu;Z.A.Liu;Z.Q.Liu;X.C.Lou;F.X.Lu;H.J.Lu;J.G.Lu;X.L.Lu;Y.Lu;Y.P.Lu;Z.H.Lu;C.L.Luo;M.X.Luo;T.Luo;X.L.Luo;X.R.Lyu;Y.F.Lyu;F.C.Ma;H.L.Ma;L.L.Ma;M.M.Ma;Q.M.Ma;R.Q.Ma;R.T.Ma;X.Y.Ma;Y.Ma;F.E.Maas;M.Maggiora;S.Maldaner;S.Malde;Q.A.Malik;A.Mangoni;Y.J.Mao;Z.P.Mao;S.Marcello;Z.X.Meng;J.G.Messchendorp;G.Mezzadri;H.Miao;T.J.Min;R.E.Mitchell;X.H.Mo;N.Yu.Muchnoi;Y.Nefedov;F.Nerling;I.B.Nikolaev;Z.Ning;S.Nisar;Y.Niu;S.L.Olsen;Q.Ouyang;S.Pacetti;X.Pan;Y.Pan;A.Pathak;P.Patteri;M.Pelizaeus;H.P.Peng;K.Peters;J.L.Ping;R.G.Ping;S.Plura;S.Pogodin;V.Prasad;F.Z.Qi;H.Qi;H.R.Qi;M.Qi;T.Y.Qi;S.Qian;W.B.Qian;Z.Qian;C.F.Qiao;J.J.Qin;L.Q.Qin;X.P.Qin;X.S.Qin;Z.H.Qin;J.F.Qiu;S.Q.Qu;K.H.Rashid;C.F.Redmer;K.J.Ren;A.Rivetti;V.Rodin;M.Rolo;G.Rong;Ch.Rosner;S.N.Ruan;A.Sarantsev;Y.Schelhaas;C.Schnier;K.Schoenning;M.Scodeggio;K.Y.Shan;W.Shan;X.Y.Shan;J.F.Shangguan;L.G.Shao;M.Shao;C.P.Shen;H.F.Shen;X.Y.Shen;B.A.Shi;H.C.Shi;J.Y.Shi;Q.Q.Shi;R.S.Shi;X.Shi;X.D.Shi;J.J.Song;W.M.Song;Y.X.Song;S.Sosio;S.Spataro;F.Stieler;K.X.Su;P.P.Su;Y.J.Su;G.X.Sun;H.Sun;H.K.Sun;J.F.Sun;L.Sun;S.S.Sun;T.Sun;W.Y.Sun;Y.J.Sun;Y.Z.Sun;Z.T.Sun;Y.H.Tan;Y.X.Tan;C.J.Tang;G.Y.Tang;J.Tang;L.Y.Tao;Q.T.Tao;M.Tat;J.X.Teng;V.Thoren;W.H.Tian;Y.Tian;I.Uman;B.Wang;B.L.Wang;C.W.Wang;D.Y.Wang;F.Wang;H.J.Wang;H.P.Wang;K.Wang;L.L.Wang;M.Wang;M.Z.Wang;Meng Wang;S.Wang;T.Wang;T.J.Wang;W.Wang;W.H.Wang;W.P.Wang;X.Wang;X.F.Wang;X.L.Wang;Y.Wang;Y.D.Wang;Y.F.Wang;Y.H.Wang;Y.Q.Wang;Yaqian Wang;Z.Wang;Z.Y.Wang;Ziyi Wang;D.H.Wei;F.Weidner;S.P.Wen;D.J.White;U.Wiedner;G.Wilkinson;M.Wolke;L.Wollenberg;J.F.Wu;L.H.Wu;L.J.Wu;X.Wu;X.H.Wu;Y.Wu;Y.J Wu;Z.Wu;L.Xia;T.Xiang;D.Xiao;G.Y.Xiao;H.Xiao;S.Y.Xiao;Y.L.Xiao;Z.J.Xiao;C.Xie;X.H.Xie;Y.Xie;Y.G.Xie;Y.H.Xie;Z.P.Xie;T.Y.Xing;C.F.Xu;C.J.Xu;G.F.Xu;H.Y.Xu;Q.J.Xu;X.P.Xu;Y.C.Xu;Z.P.Xu;F.Yan;L.Yan;W.B.Yan;W.C.Yan;H.J.Yang;H.L.Yang;H.X.Yang;L.Yang;Tao Yang;Y.F.Yang;Y.X.Yang;Yifan Yang;M.Ye;M.H.Ye;J.H.Yin;Z.Y.You;B.X.Yu;C.X.Yu;G.Yu;T.Yu;X.D.Yu;C.Z.Yuan;L.Yuan;S.C.Yuan;X.Q.Yuan;Y.Yuan;Z.Y.Yuan;C.X.Yue;A.A.Zafar;F.R.Zeng;X.Zeng;Y.Zeng;X.Y.Zhai;Y.H.Zhan;A.Q.Zhang;B.L.Zhang;B.X.Zhang;D.H.Zhang;G.Y.Zhang;H.Zhang;H.H.Zhang;H.H.Zhang;H.Y.Zhang;J.L.Zhang;J.Q.Zhang;J.W.Zhang;J.X.Zhang;J.Y.Zhang;J.Z.Zhang;Jianyu Zhang;Jiawei Zhang;L.M.Zhang;L.Q.Zhang;Lei Zhang;P.Zhang;Q.Y.Zhang;Shuihan Zhang;Shulei Zhang;X.D.Zhang;X.M.Zhang;X.Y.Zhang;X.Y.Zhang;Y.Zhang;Y.T.Zhang;Y.H.Zhang;Yan Zhang;Yao Zhang;Z.H.Zhang;Z.L.Zhang;Z.Y.Zhang;Z.Y.Zhang;G.Zhao;J.Zhao;J.Y.Zhao;J.Z.Zhao;Lei Zhao;Ling Zhao;M.G.Zhao;S.J.Zhao;Y.B.Zhao;Y.X.Zhao;Z.G.Zhao;A.Zhemchugov;B.Zheng;J.P.Zheng;Y.H.Zheng;B.Zhong;C.Zhong;X.Zhong;H.Zhou;L.P.Zhou;X.Zhou;X.K.Zhou;X.R.Zhou;X.Y.Zhou;Y.Z.Zhou;J.Zhu;K.J.Zhu;L.X.Zhu;S.H.Zhu;S.Q.Zhu;T.J.Zhu;W.J.Zhu;Y.C.Zhu;Z.A.Zhu;J.H.Zou;Institute of High Energy Physics;G.I.Budker Institute of Nuclear Physics SB RAS (BINP);the Novosibirsk State University;Uppsala University;Bochum Ruhr-University;Johannes Gutenberg University of Mainz;University of Turin;INFN;Liaoning Normal University;Southeast University;Joint Institute for Nuclear Research;INFN Laboratori Nazionali di Frascati;INFN Sezione di Ferrara;Peking University;State Key Laboratory of Nuclear Physics and Technology, Peking University;National Centre for Nuclear Research;Institute of Physics and Technology;University of Muenster;Carnegie Mellon University;Wuhan University;State Key Laboratory of Particle Detection and Electronics;University of Chinese Academy of Sciences;Istinye University;Nankai University;the Moscow Institute of Physics and Technology;Soochow University;Nanjing University;Tsinghua University;Institute of Modern Physics;Hunan University;School of Physics and Electronics, Hunan University;Shandong University;Yunnan University;Helmholtz Institute Mainz;Liaoning University;Jilin University;Zhengzhou University;University of Eastern Piedmont;University of Science and Technology of China;Sun Yat-Sen University;University of Oxford;University of Ferrara;University of Manchester;GSI Helmholtzcentre for Heavy Ion Research GmbH;Guangxi University;Nanjing Normal University;Shandong Normal University;Fudan University;Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University;Henan Normal University;University of Hawaii;Suranaree University of Technology, University Avenue 111;South China Normal University;Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University;University of the Punjab;Indiana University;Huangshan College;University of Jinan;University of Groningen;Justus-Liebig-Universitaet Giessen, II.Physikalisches Institut;Indian Institute of Technology Madras;Qufu Normal University;Shanxi University;Beijing Institute of Petrochemical Technology;Lanzhou University;Frontiers Science Center for Rare Isotopes, Lanzhou University;Lanzhou Center for Theoretical Physics, Lanzhou University;Sichuan University;Guangxi Normal University;Central China Normal University;Henan University of Science and Technology;University of South China;Henan University of Technology;Central South University;INFN Sezione di Perugia;Goethe University Frankfurt;COMSATS University Islamabad, Lahore Campus;the Department of Mathematical Sciences, IBA;University of Perugia;the NRC "Kurchatov Institute", PNPI;Hunan Normal University;Near East University, Nicosia, North Cyprus;North China Electric Power University;Hebei University;Hangzhou Normal University;Shanghai Jiao Tong University;Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education, Shanghai Key Laboratory for Particle Physics and Cosmology, Institute of Nuclear and Particle Physics;China Center of Advanced Science and Technology;Beihang University;Xinyang Normal University;University of Science and Technology Liaoning;

【机构】 Institute of High Energy PhysicsG.I.Budker Institute of Nuclear Physics SB RAS (BINP)the Novosibirsk State UniversityUppsala UniversityBochum Ruhr-UniversityJohannes Gutenberg University of MainzUniversity of TurinINFNLiaoning Normal UniversityState Key Laboratory of Particle Detection and ElectronicsUniversity of Science and Technology of ChinaSoutheast UniversityJoint Institute for Nuclear ResearchINFN Laboratori Nazionali di FrascatiINFN Sezione di FerraraPeking UniversityState Key Laboratory of Nuclear Physics and Technology, Peking UniversityNational Centre for Nuclear ResearchInstitute of Physics and TechnologyUniversity of MuensterCarnegie Mellon UniversityWuhan UniversityUniversity of Chinese Academy of SciencesIstinye UniversityNankai Universitythe Moscow Institute of Physics and TechnologySoochow UniversityNanjing UniversityTsinghua UniversityInstitute of Modern PhysicsHunan UniversitySchool of Physics and Electronics, Hunan UniversityShandong UniversityYunnan UniversityHelmholtz Institute MainzLiaoning UniversityJilin UniversityZhengzhou UniversitySun Yat-Sen UniversityUniversity of OxfordUniversity of FerraraUniversity of ManchesterGSI Helmholtzcentre for Heavy Ion Research GmbHGuangxi UniversityNanjing Normal UniversityShandong Normal UniversityFudan UniversityKey Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan UniversityHenan Normal UniversityUniversity of HawaiiSuranaree University of Technology, University Avenue 111South China Normal UniversityiUniversity of the PunjabIndiana UniversityHuangshan CollegeUniversity of JinanUniversity of GroningenJustus-Liebig-Universitaet Giessen, II.Physikalisches InstitutIndian Institute of Technology MadrasQufu Normal UniversityShanxi UniversityGuangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal UniversityBeijing Institute of Petrochemical TechnologyLanzhou UniversityFrontiers Science Center for Rare Isotopes, Lanzhou UniversityLanzhou Center for Theoretical Physics, Lanzhou UniversitySichuan UniversityGuangxi Normal UniversityCentral China Normal UniversityHenan University of Science and TechnologyUniversity of South ChinaHenan University of TechnologyCentral South UniversityINFN Sezione di PerugiaGoethe University FrankfurtCOMSATS University Islamabad, Lahore Campusthe Department of Mathematical Sciences, IBAUniversity of Perugiathe NRC "Kurchatov Institute", PNPIHunan Normal UniversityNorth China Electric Power UniversityHebei UniversityHangzhou Normal UniversityShanghai Jiao Tong UniversityKey Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education, Shanghai Key Laboratory for Particle Physics and Cosmology, Institute of Nuclear and Particle PhysicsChina Center of Advanced Science and TechnologyBeihang UniversityXinyang Normal UniversityUniversity of Science and Technology Liaoning

【摘要】 Using electron-positron annihilation data samples corresponding to an integrated luminosity of 4.5 fb-1,collected by the BESⅢ detector in the energy region between 4599.53 MeV and 4698.82 MeV,we report the first observations of the Cabibbo-suppressed decays Λc+→nπ+π0c+→nπ+π-π+,and the Cabibbo-favored decayΛc+→nK-π+π+ with statistical significances of 7.9σ,7.8σ,and >10σ,respectively.The branching fractions of these decays are measured to be B(Λc+→nπ+π0)=(0.64±0.09±0.02)%,B(Λc+→nπ+π-π+)=(0.45±0.07±0.03)%,and B(Λc+→nK-π+π+)=(1.90±0.08±0.09)%,where the first uncertainties are statistical and the second are systematic.We find that the branching fraction of the decay Λc+→nπ+π0 is about one order of magnitude higher than that of Λc+→nπ+.

【Abstract】 Using electron-positron annihilation data samples corresponding to an integrated luminosity of 4.5 fb-1,collected by the BESⅢ detector in the energy region between 4599.53 MeV and 4698.82 MeV,we report the first observations of the Cabibbo-suppressed decays Λc+→nπ+π0c+→nπ+π-π+,and the Cabibbo-favored decayΛc+→nK-π+π+ with statistical significances of 7.9σ,7.8σ,and >10σ,respectively.The branching fractions of these decays are measured to be B(Λc+→nπ+π0)=(0.64±0.09±0.02)%,B(Λc+→nπ+π-π+)=(0.45±0.07±0.03)%,and B(Λc+→nK-π+π+)=(1.90±0.08±0.09)%,where the first uncertainties are statistical and the second are systematic.We find that the branching fraction of the decay Λc+→nπ+π0 is about one order of magnitude higher than that of Λc+→nπ+.

【基金】 Supported in part by National Key R & D Program of China (2020YFA0406400, 2020YFA0406300);National Natural Science Foundation of China (NSFC) (11635010, 11735014, 11805086, 11835012, 11935015, 11935016, 11935018, 11975011, 11961141012, 12022510, 12025502, 12035009, 12035013, 12192260, 12192261, 12192262, 12192263, 12192264, 12192265);the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program;Joint Large-Scale Scientific Facility Funds of the NSFC and CAS (U1832207);the CAS Center for Excellence in Particle Physics (CCEPP);100 Talents Program of CAS;Fundamental Research Funds for the Central Universities, Lanzhou University, University of Chinese Academy of Sciences;The Institute of Nuclear and Particle Physics (INPAC);Shanghai Key Laboratory for Particle Physics and Cosmology; ERC (758462);German Research Foundation DFG (443159800);Collaborative Research Center CRC 1044, GRK 2149;Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Development of Turkey (DPT2006K-120470);National Science and Technology fund; National Science Research and Innovation Fund (NSRF) via the Program Management Unit for Human Resources & Institutional Development, Research and Innovation (B16F640076; STFC) (United Kingdom);Suranaree University of Technology (SUT);Thailand Science Research and Innovation (TSRI);National Science Research and Innovation Fund (NSRF) (160355);The Royal Society, UK (DH140054, DH160214);The Swedish Research Council;U.S.Department of Energy (DEFG02-05ER41374)
  • 【文献出处】 Chinese Physics C ,中国物理C , 编辑部邮箱 ,2023年02期
  • 【分类号】O572.33
  • 【下载频次】6
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