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Observations of the Cabibbo-Suppressed decays Λ_(c)^(+)→nπ+π^(0),nπ^(+)π^(-)π^(+) and the Cabibbo-Favored decay Λ_(c)^(+)→nK^(-)π^(+)π^(+)

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摘要 Using electron-positron annihilation data samples corresponding to an integrated luminosity of 4.5 fb-1,collected by the BESⅢdetector in the energy region between 4599.53 MeV and 4698.82 MeV,we report the first observations of the Cabibbo-suppressed decaysΛ_(c)^(+)→nπ^(+)π^(0),Λ_(c)^(+)→nπ^(+)π^(-)π^(+),and the Cabibbo-favored decayΛ_(c)^(+)→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(Λ_(c)^(+)→nπ^(+)π^(0))=(0.64±0.09±0.02)%,B(Λ_(c)^(+)→nπ^(+)π^(-)π^(+))=(0.45±0.07±0.03)%,and B(Λ_(c)^(+)→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 decayΛ_(c)^(+)→nπ^(+)π^(0)is about one order of magnitude higher than that ofΛ_(c)^(+)→nπ^(+).
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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.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,Beijing 100049,China;Beihang University,Beijing 100191,China;Beijing Institute of Petrochemical Technology,Beijing 102617,China;Bochum Ruhr-University,D-44780 Bochum,Germany;Carnegie Mellon University,Pittsburgh,Pennsylvania 15213,USA;Central China Normal University,Wuhan 430079,China;Central South University,Changsha 410083,China;China Center of Advanced Science and Technology,Beijing 100190,China;COMSATS University Islamabad,Lahore Campus,Defence Road,Off Raiwind Road,54000 Lahore,Pakistan;Fudan University,Shanghai 200433,China;G.I.Budker Institute of Nuclear Physics SB RAS(BINP),Novosibirsk 630090,Russia;GSI Helmholtzcentre for Heavy Ion Research GmbH,D-64291 Darmstadt,Germany;Guangxi Normal University,Guilin 541004,China;Guangxi University,Nanning 530004,China;Hangzhou Normal University,Hangzhou 310036,China;Hebei University,Baoding 071002,China;Helmholtz Institute Mainz,Staudinger Weg 18,D-55099 Mainz,Germany;Henan Normal University,Xinxiang 453007,China;Henan University of Science and Technology,Luoyang 471003,China;Henan University of Technology,Zhengzhou 450001,China;Huangshan College,Huangshan 245000,China;Hunan Normal University,Changsha 410081,China;Hunan University,Changsha 410082,China;Indian Institute of Technology Madras,Chennai 600036,India;Indiana University,Bloomington,Indiana 47405,USA;INFN Laboratori Nazionali di Frascati,I-00044,Frascati,Italy;INFN Sezione di Perugia,I-06100,Perugia,Italy;University of Perugia,I-06100,Perugia,Italy;INFN Sezione di Ferrara,I-44122,Ferrara,Italy;University of Ferrara,I-44122,Ferrara,Italy;Institute of Modern Physics,Lanzhou 730000,China;Institute of Physics and Technology,Peace Avenue 54B,Ulaanbaatar 13330,Mongolia;Jilin University,Changchun 130012,China;Johannes Gutenberg University of Mainz,Johann-Joachim-Becher-Weg 45,D-55099 Mainz,Germany;Joint Institute for Nuclear Research,141980 Dubna,Moscow region,Russia;Justus-Liebig-Universitaet Giessen,II.Physikalisches Institut,Heinrich-Buff-Ring 16,D-35392 Giessen,Germany;Lanzhou University,Lanzhou 730000,China;Liaoning Normal University,Dalian 116029,China;Liaoning University,Shenyang 110036,China;Nanjing Normal University,Nanjing 210023,China;Nanjing University,Nanjing 210093,China;Nankai University,Tianjin 300071,China;National Centre for Nuclear Research,Warsaw 02-093,Poland;North China Electric Power University,Beijing 102206,China;Peking University,Beijing 100871,China;Qufu Normal University,Qufu 273165,China;Shandong Normal University,Jinan 250014,China;Shandong University,Jinan 250100,China;Shanghai Jiao Tong University,Shanghai 200240,China;Shanxi Normal University,Linfen 041004,China;Shanxi University,Taiyuan 030006,China;Sichuan University,Chengdu 610064,China;Soochow University,Suzhou 215006,China;South China Normal University,Guangzhou 510006,China;Southeast University,Nanjing 211100,China;State Key Laboratory of Particle Detection and Electronics,Beijing 100049,Hefei 230026,China;Sun Yat-Sen University,Guangzhou 510275,China;Suranaree University of Technology,University Avenue 111,Nakhon Ratchasima 30000,Thailand;Tsinghua University,Beijing 100084,China;Istinye University,34010,Istanbul,Turkey;Near East University,Nicosia,North Cyprus,Mersin 10,Turkey;University of Chinese Academy of Sciences,Beijing 100049,China;University of Groningen,NL-9747 AA Groningen,The Netherlands;University of Hawaii,Honolulu,Hawaii 96822,USA;University of Jinan,Jinan 250022,China;University of Manchester,Oxford Road,Manchester,M139PL,United Kingdom;University of Muenster,Wilhelm-Klemm-Strasse 9,48149 Muenster,Germany;University of Oxford,Keble Road,Oxford OX13RH,United Kingdom;University of Science and Technology Liaoning,Anshan 114051,China;University of Science and Technology of China,Hefei 230026,China;University of South China,Hengyang 421001,China;University of the Punjab,Lahore-54590,Pakistan;University of Turin,I-10125,Turin,Italy;University of Eastern Piedmont,I-15121,Alessandria,Italy;INFN,I-10125,Turin,Italy;Uppsala University,Box 516,SE-75120 Uppsala,Sweden;Wuhan University,Wuhan 430072,China;Xinyang Normal University,Xinyang 464000,China;Yunnan University,Kunming 650500,China;Zhejiang University,Hangzhou 310027,China;Zhengzhou University,Zhengzhou 450001,China;Also at the Moscow Institute of Physics and Technology,Moscow 141700,Russia;Also at the Novosibirsk State University,Novosibirsk,630090,Russia;Also at the NRC"Kurchatov Institute",PNPI,188300,Gatchina,Russia;Also at Goethe University Frankfurt,60323 Frankfurt am Main,Germany;Also at 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,Shanghai 200240,China;Also at Key Laboratory of Nuclear Physics and Ion-beam Application(MOE)and Institute of Modern Physics,Fudan University,Shanghai 200443,China;Also at State Key Laboratory of Nuclear Physics and Technology,Peking University,Beijing 100871,China;Also at School of Physics and Electronics,Hunan University,Changsha 410082,China;Also at Guangdong Provincial Key Laboratory of Nuclear Science,Institute of Quantum Matter,South China Normal University,Guangzhou 510006,China;Also at Frontiers Science Center for Rare Isotopes,Lanzhou University,Lanzhou 730000,China;Also at Lanzhou Center for Theoretical Physics,Lanzhou University,Lanzhou 730000,China;Also at the Department of Mathematical Sciences,IBA,Karachi,Pakistan)
机构地区 Institute of High Energy Physics Beihang University Beijing Institute of Petrochemical Technology Bochum Ruhr-University Carnegie Mellon University Central China Normal University Central South University China Center of Advanced Science and Technology COMSATS University Islamabad Fudan University G.I.Budker Institute of Nuclear Physics SB RAS(BINP) GSI Helmholtzcentre for Heavy Ion Research GmbH Guangxi Normal University Guangxi University Hangzhou Normal University Hebei University Helmholtz Institute Mainz Henan Normal University Henan University of Science and Technology Henan University of Technology Huangshan College Hunan Normal University Hunan University Indian Institute of Technology Madras Indiana University INFN Laboratori Nazionali di Frascati INFN Sezione di Perugia University of Perugia INFN Sezione di Ferrara University of Ferrara Institute of Modern Physics Institute of Physics and Technology Jilin University Johannes Gutenberg University of Mainz Joint Institute for Nuclear Research Justus-Liebig-Universitaet Giessen Lanzhou University Liaoning Normal University Liaoning University Nanjing Normal University Nanjing University Nankai University National Centre for Nuclear Research North China Electric Power University Peking University Qufu Normal University Shandong Normal University Shandong University Shanghai Jiao Tong University Shanxi Normal University Shanxi University Sichuan University Soochow University South China Normal University Southeast University State Key Laboratory of Particle Detection and Electronics Sun Yat-Sen University Suranaree University of Technology Tsinghua University Istinye University Near East University University of Chinese Academy of Sciences University of Groningen University of Hawaii University of Jinan University of Manchester University of Muenster University of Oxford University of Science and Technology Liaoning University of Science and Technology of China University of South China University of the Punjab University of Turin University of Eastern Piedmont INFN Uppsala University Wuhan University Xinyang Normal University Yunnan University Zhejiang University Zhengzhou University Also at the Moscow Institute of Physics and Technology Also at the Novosibirsk State University Also at the NRC"Kurchatov Institute" Also at Goethe University Frankfurt Also at Key Laboratory for Particle Physics Also at Key Laboratory of Nuclear Physics and Ion-beam Application(MOE)and Institute of Modern Physics Also at State Key Laboratory of Nuclear Physics and Technology Also at School of Physics and Electronics Also at Guangdong Provincial Key Laboratory of Nuclear Science Also at Frontiers Science Center for Rare Isotopes Also at Lanzhou Center for Theoretical Physics Also at the Department of Mathematical Sciences
出处 《Chinese Physics C》 SCIE CAS CSCD 2023年第2期1-18,共18页 中国物理C(英文版)
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)。
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