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Measurement of integrated luminosity and center-of-mass energy of data taken by BESⅢ at s^(1/2)=2.125 GeV

Chinese Physics C 2017年第11期41卷 1-9页

作者：麦迪娜 M.N.Achasov S.Ahmed 艾小聪 O.Albayrak M.Albrecht D.J.Ambrose A.Amoroso 安芬芬安琪白景芝 R.Baldini Ferroli 班勇 D.W.Bennett J.V.Bennett N.Berger M.Bertani D.Bettoni 边渐鸣 F.Blanchi E.Boger I.Boyko R.A.Briere 蔡浩蔡啸 O.Cakir A.Calcaterra 曹国富 S.A.Cetin J.Chai 常劲帆 G.Chelkov 陈刚陈和生陈江川陈玛丽陈实陈申见堪炫陈旭荣陈元柏程和平褚新坤 G.Cibinetto 代洪亮代建平 A.Dbeyssi D.Dedovich 邓子艳 A.Denig I.Denysenko M.Destefanis F.DEMori 丁勇董超董静董燎原董明义豆正磊杜书先段鹏飞范荆州方建房双世方馨方易 R.Farinelli L.Fava O.Fedorov F.Feldbauer G.Felici 封常青 E.Fiorauanti M.Fritsch 傅成栋高清高鑫磊高原宁高榛 I.Garzia K.Goetzen 龚丽龚文煊 W.Gradl M.Greco 顾旻皓顾运厅管颖慧郭爱强郭立波郭如盼郭玥郭玉萍 Z.Haddadi A.Hafner 韩爽郝喜庆 F.A.Harris 何康林 F.H.Heinsius T.Held 衡月昆 T.Holtmann 侯治龙胡琛胡海明胡继峰胡涛胡誉黄光顺黄金书黄性涛黄晓忠黄勇黄智玲 T.Hussain 纪全姬清平季晓斌季筱璐姜鲁文江晓山蒋兴雨焦健斌焦铮金大鹏金山 T.Johansson A.Julin N.Kalantar-Nayestanaki 康晓琳康晓坤 M.Kavatsyuk 柯百谦 P.Kiese R.Kliemt B.Kloss O.B.Kolcu B.Kopf M.Kornicer A.Kupsc W.Kühn J.S.Lange M.Lara P.Larin H.Leithoff C.Leng 李翠李澄李德民李飞李峰云李刚李海波李惠静李家才李瑾李康李科李蕾李培荣李启云李腾李卫东李卫国李晓玲李小男李学潜李郁博李志兵梁昊梁勇飞梁羽铁廖广睿林德旭刘冰刘北江刘春秀刘栋刘福虎刘芳刘峰刘宏邦刘汇慧刘欢欢刘怀民刘杰刘建北刘觉平刘晶译刘凯刘魁勇刘兰雕刘佩莲刘倩刘树彬刘翔刘玉斌刘媛媛刘振安刘智青 H.Loehner 龙云飞娄辛丑吕海江吕军光卢宇卢云鹏罗成林罗民兴 T.Luo 罗小兰吕晓睿马凤才马海龙马连良马明明马秋梅马天马旭宁马骁妍马玉明 F.E.Maas M.Maggiora Q.A.Malik 冒亚军毛泽普 S.Marcello J.G.Messchendorp G.Mezzadri 闵建闵天觉 R.E.Mitchell 莫晓虎莫玉俊 C.Morales Morales N.Yu.Muchnoi H.Muramatsu P.Musiol Y.Nefedov F.Nerling I.B.Nikolaev 宁哲 S.Nisar 牛顺利牛讯伊马鹏欧阳群 S.Pacetti 潘越 P.Patteri M.Pelizaeus 彭海平 K.Peters J.Pettersson 平加伦平荣刚 R.Poling V.Prasad 漆红荣祁鸣钱森乔从丰秦丽清覃拈秦小帅秦中华邱进发 K.H.Rashid C.F.Redmer M.Ripka 荣刚 Ch.Rosner 阮向东 A.Sarantsev M.Savrié C.Schnier K.Schoenning S.Schumann 邵明沈成平沈培迅沈肖雁盛华义施萌宋维民宋欣颖 S.Sosio S.Spataro 孙功星孙俊峰孙胜森孙新华孙勇杰孙永昭孙志嘉孙振田唐昌建唐晓 I.Tapan E.H.Thorndike M.Tieinens I.Uman G.S.Varner 王斌王滨龙王东王大勇王科王亮亮王灵淑王萌王平王佩良王炜王维平王雄飞王越王雅迪王贻芳王亚乾王铮王志刚王志宏王至勇王宗源 T.Weber 魏代会 P.Weidenkaff 文硕频 U.Wiedner M.Wolke 伍灵慧吴连近吴智夏磊夏力钢夏宇肖栋肖浩肖振军谢宇广修青磊许国发徐静静徐雷徐庆君徐庆年徐新平严亮鄢文标闫文成颜永红杨海军杨洪勋杨柳杨永栩叶梅叶铭汉殷俊昊尤郑昀 Institute of High Energy Physics G.I.Budker Institute of Nuclear Physics SB RAS (BINP) the Novosibirsk State University Helmholtz Institute Mainz Carnegie Mellon University Bochum Ruhr-University University of Rochester University of Turin INFN University of Science and Technology of China State Key Laboratory of Particle Detection and Electronics INFN Laboratori Nazionali di Frascati Peking University Indiana University Johannes Gutenberg University of Mainz INFN Sezione di Ferrara University of Minnesota Joint Institute for Nuclear Research the Moscow Institute of Physics and Technology Wuhan University Ankara University Istanbul Bilgi University the Functional Electronics Laboratory Tomsk State University University of Chinese Academy of Sciences Nanjing University Lanzhou University Huangshan College Shanghai Jiao Tong University Liaoning University Nankai University Zhengzhou University Tsinghua University University of Ferrara University of Eastern Piedmont GSI Helmholtzcentre for Heavy Ion Research GmbH Guangxi University Nanjing Normal University KVI-CART University of Groningen Henan Normal University University of Hawaii Shandong University University of the Punjab Uppsala University Istanbul Arel University Justus-Liebig-Universitaet Giessen Ⅱ.Physikalisches Institut Seoul National University Hangzhou Normal University Beijing Institute of Petrochemical Technology Beihang University Sun Yat-Sen University Sichuan University Guangxi Normal University Shanxi University Central China Normal University Henan University of Science and Technology University of Texas at Dallas Zhejiang University University of Hawaii Honolulu University of Minnesota Minneapolis COMSATS Institute of Information Technology INFN and University of Perugia Goethe University Frankfurt the NRC "Kurchatov Institute" PNPI Uludag University Near East University Soochow University Hunan University University of South China China Center of Advanced Science and Technology Bogazici University University of Science and Technology Liaoning

To study the nature of the state Y（2175）,a dedicated data set of e ＋ e-collision data was collected at the center-of-mass energy of 2.125 GeV with the BESⅢ detector at the BEPCⅡ *** analyzing large-angle Bhabha scattering events,the integrated luminosity of this data set is determined to be 108.49±0.02±0.85 pb-1,where the first uncertainty is statistical and the second one is *** addition,the center-of-mass energy of the data set is determined with radiative dimuon events to be 2126.55±0.03±0.85 MeV,where the first uncertainty is statistical and the second one is systematic.

关键词： Bhabha scattering luminosity radiative dimuon events center-of-mass energy

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Determination of the Λ+c spin via the reaction e+e− → Λ+c Λ¯ − c

arXiv

引用

arXiv 2020年

作者： Ablikim, M. Achasov, M.N. Adlarson, P. Ahmed, S. Albrecht, M. Aliberti, R. Amoroso, A. An, M.R. An, Q. Bai, X.H. Bai, Y. Bakina, O. Baldini Ferroli, R. Balossino, I. Ban, Y. Begzsuren, K. Berger, N. Bertani, M. Bettoni, D. Bloms, J. Boyko, I. Briere, R.A. Cai, H. Cai, X. Calcaterra, A. Cao, G.F. Cao, N. Cetin, S.A. Chang, J.F. Chang, W.L. Chelkov, G. Chen, D.Y. Chen, G. Chen, H.S. Chen, M.L. Chen, S.J. Chen, X.R. Chen, Y.B. Chen, Z.J. Cheng, W.S. Cibinetto, G. Cossio, F. Cui, X.F. Dai, H.L. Dai, X.C. Dbeyssi, A. de Boer, R.E. Dedovich, D. Deng, Z.Y. Denig, A. Denysenko, I. Ding, Y. Dong, C. Dong, J. Dong, L.Y. Dong, M.Y. Dong, X. Du, S.X. Fan, Y.L. Fang, J. Fang, S.S. Fang, Y. Farinelli, R. Feldbauer, F. Felici, G. Feng, C.Q. Feng, J.H. Fritsch, M. Fu, C.D. Gao, Y. Gao, Y. Gao, Y. Gao, Y.G. Ge, P.T. Geng, C. Gersabeck, E.M. Gilman, A. Goetzen, K. Gong, L. Gong, W.X. Gradl, W. Gu, L.M. Gu, M.H. Gu, S. Gu, Y.T. Guan, C.Y. Guo, A.Q. Guo, L.B. Guo, R.P. Guo, Y.P. Guskov, A. Han, T.T. Han, W.Y. Hao, X.Q. Harris, F.A. He, K.L. Heinsius, F.H. Heinz, C.H. Held, T. Heng, Y.K. Herold, C. Himmelreich, M. Holtmann, T. Hou, G.Y. Hou, Y.R. Hou, Z.L. Hu, H.M. Hu, J.F. Hu, T. Hu, Y. Huang, G.S. Huang, L.Q. Huang, X.T. Huang, Y.P. Huang, Z. Hussain, T. Hüsken, N. Ikegami Andersson, W. Imoehl, W. Irshad, M. Jaeger, S. Janchiv, S. Ji, Q. Ji, Q.P. Ji, X.B. Ji, X.L. Ji, Y.Y. Jiang, H.B. Jiang, X.S. Jiao, J.B. Jiao, Z. Jin, S. Jin, Y. Jing, M.Q. Johansson, T. Kalantar-Nayestanaki, N. Kang, X.S. Kappert, R. Kavatsyuk, M. Ke, B.C. Keshk, I.K. Khoukaz, A. Kiese, P. Kiuchi, R. Kliemt, R. Koch, L. Kolcu, O.B. Kopf, B. Kuemmel, M. Kuessner, M. Kupsc, A. Kurth, M.G. Kühn, W. Lane, J.J. Lange, J.S. Larin, P. Lavania, A. Lei, Z.H. Leithoff, H. Lellmann, M. Lenz, T. Li, C. Li, C.H. Li, Cheng Li, D.M. Li, F. Li, G. Li, H. Institute of High Energy Physics Beijing100049 China Beihang University Beijing100191 China Beijing Institute of Petrochemical Technology Beijing102617 China Bochum Ruhr-University BochumD-44780 Germany Carnegie Mellon University PittsburghPA15213 United States Central China Normal University Wuhan430079 China China Center of Advanced Science and Technology Beijing100190 China COMSATS University Islamabad Lahore Campus Defence Road Off Raiwind Road Lahore54000 Pakistan Fudan University Shanghai200443 China Novosibirsk630090 Russia GSI Helmholtzcentre for Heavy Ion Research GmbH DarmstadtD-64291 Germany Guangxi Normal University Guilin541004 China Guangxi University Nanning530004 China Hangzhou Normal University Hangzhou310036 China Helmholtz Institute Mainz Staudinger Weg 18 MainzD-55099 Germany Henan Normal University Xinxiang453007 China Henan University of Science and Technology Luoyang471003 China Huangshan College Huangshan245000 China Hunan Normal University Changsha410081 China Hunan University Changsha410082 China Indian Institute of Technology Madras Chennai600036 India Indiana University BloomingtonIN47405 United States INFN Laboratori Nazionali di Frascati INFN Laboratori Nazionali di Frascati FrascatiI-00044 Italy INFN Sezione di Perugia PerugiaI-06100 Italy University of Perugia PerugiaI-06100 Italy INFN Sezione di Ferrara INFN Sezione di Ferrara FerraraI-44122 Italy University of Ferrara FerraraI-44122 Italy Institute of Modern Physics Lanzhou730000 China Institute of Physics and Technology Peace Ave. 54B Ulaanbaatar13330 Mongolia Jilin University Changchun130012 China Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 MainzD-55099 Germany Joint Institute for Nuclear Research Dubna Moscow region141980 Russia Justus-Liebig-Universitaet Giessen II. Physikalisches Institut Heinrich-Buff-Ring 16 GiessenD-35392 Germany Lanzhou University Lanzhou730000 China Liaoning Normal

We report on a comparison of two possible Λ+c spin hypotheses, J = 21 and 32, via the process e+e− → Λ+c Λ¯−c , using the angular distributions of Λ+c decays into pKS0, Λπ+, Σ0π+, and Σ+π0. The data were recorded at √s = 4.6 GeV with the BESIII detector and correspond to an integrated luminosity of 587 pb−1. The Λ+c spin is determined to be J = 12, with this value favored over the 23 hypothesis with a significance corresponding to more than 6 Gaussian standard deviations. Copyright © 2020, The Authors. All rights reserved.

关键词： Germanium alloys

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Observation of the Doubly Cabibbo-Suppressed Decay D+→K+π+π−π0 and Evidence for D+→K+ω

引用

Physical Review Letters 2020年第14期125卷 141802-141802页

作者： M. Ablikim M. N. Achasov P. Adlarson S. Ahmed M. Albrecht A. Amoroso Q. An Anita X. H. Bai Y. Bai O. Bakina R. Baldini Ferroli I. Balossino Y. Ban K. Begzsuren J. V. Bennett N. Berger M. Bertani D. Bettoni F. Bianchi J. Biernat J. Bloms A. Bortone I. Boyko R. A. Briere H. Cai X. Cai A. Calcaterra G. F. Cao N. Cao S. A. Cetin J. F. Chang W. L. Chang G. Chelkov D. Y. Chen G. Chen H. S. Chen M. L. Chen S. J. Chen X. R. Chen Y. B. Chen Z. J. Chen W. S. Cheng G. Cibinetto F. Cossio X. F. Cui H. L. Dai J. P. Dai X. C. Dai A. Dbeyssi R. B. de Boer D. Dedovich Z. Y. Deng A. Denig I. Denysenko M. Destefanis F. De Mori Y. Ding C. Dong J. Dong L. Y. Dong M. Y. Dong S. X. Du J. Fang S. S. Fang Y. Fang R. Farinelli L. Fava F. Feldbauer G. Felici C. Q. Feng M. Fritsch C. D. Fu Y. Fu X. L. Gao Y. Gao Y. G. Gao I. Garzia E. M. Gersabeck A. Gilman K. Goetzen L. Gong W. X. Gong W. Gradl M. Greco L. M. Gu M. H. Gu S. Gu Y. T. Gu C. Y. Guan A. Q. Guo L. B. Guo R. P. Guo Y. P. Guo A. Guskov S. Han T. T. Han T. Z. Han X. Q. Hao F. A. Harris K. L. He F. H. Heinsius T. Held Y. K. Heng M. Himmelreich T. Holtmann Y. R. Hou Z. L. Hou H. M. Hu J. F. Hu T. Hu Y. Hu G. S. Huang L. Q. Huang X. T. Huang Y. P. Huang Z. Huang N. Huesken T. Hussain W. Ikegami Andersson W. Imoehl M. Irshad S. Jaeger S. Janchiv Q. Ji Q. P. Ji X. B. Ji X. L. Ji H. B. Jiang X. S. Jiang X. Y. Jiang J. B. Jiao Z. Jiao S. Jin Y. Jin T. Johansson N. Kalantar-Nayestanaki X. S. Kang R. Kappert M. Kavatsyuk B. C. Ke I. K. Keshk A. Khoukaz P. Kiese R. Kiuchi R. Kliemt L. Koch O. B. Kolcu B. Kopf M. Kuemmel M. Kuessner A. Kupsc M. G. Kurth W. Kühn J. J. Lane J. S. Lange P. Larin L. Lavezzi H. Leithoff M. Lellmann T. Lenz C. Li C. H. Li Cheng Li D. M. Li F. Li G. Li H. B. Li H. J. Li J. L. Li J. Q. Li Ke Li L. K. Li Lei Li P. L. Li P. R. Li S. Y. Li W. D. Li W. G. Li X. H. Li X. L. Li Z. B. Li Z. Y. Li H. Liang Y. F. Liang Y. T. Liang L. Z. Liao J. Libby C. X. Lin B. Liu B. J. Liu C. X. Liu D. Liu D. Y. Liu F. H. Liu Fang Liu Feng Liu H. B. Liu H. M. Liu Huanhuan Liu Huihui Liu Institute of High Energy Physics Beijing 100049 People’s Republic of China G.I. Budker Institute of Nuclear Physics SB RAS (BINP) Novosibirsk 630090 Russia Uppsala University Box 516 SE-75120 Uppsala Sweden Helmholtz Institute Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany Bochum Ruhr-University D-44780 Bochum Germany University of Turin I-10125 Turin Italy INFN I-10125 Turin Italy University of Science and Technology of China Hefei 230026 People’s Republic of China State Key Laboratory of Particle Detection and Electronics Beijing 100049 Hefei 230026 People’s Republic of China Indian Institute of Technology Madras Chennai 600036 India University of Jinan Jinan 250022 People’s Republic of China Southeast University Nanjing 211100 People’s Republic of China Joint Institute for Nuclear Research 141980 Dubna Moscow region Russia INFN Laboratori Nazionali di Frascati I-00044 Frascati Italy INFN Sezione di Ferrara I-44122 Ferrara Italy Peking University Beijing 100871 People’s Republic of China Institute of Physics and Technology Peace Avenue 54B Ulaanbaatar 13330 Mongolia Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany University of Muenster Wilhelm-Klemm-Str. 9 48149 Muenster Germany Wuhan University Wuhan 430072 People’s Republic of China University of Chinese Academy of Sciences Beijing 100049 People’s Republic of China Istanbul Bilgi University 34060 Eyup Istanbul Turkey Central China Normal University Wuhan 430079 People’s Republic of China Nanjing University Nanjing 210093 People’s Republic of China Institute of Modern Physics Lanzhou 730000 People’s Republic of China Hunan University Changsha 410082 People’s Republic of China Nankai University Tianjin 300071 People’s Republic of China Shanghai Jiao Tong University Shanghai 200240 People’s Republic of China Liaoning University Shenyang 110036 People’s Republic of China Zhengzhou Uni

Using 2.93 fb−1 of e+e− collision data collected at a center-of-mass energy of 3.773 GeV with the BESIII detector, the first observation of the doubly Cabibbo-suppressed decay D+→K+π+π−π0 is reported. After removing decays that contain narrow intermediate resonances, including D+→K+η, D+→K+ω, and D+→K+ϕ, the branching fraction of the decay D+→K+π+π−π0 is measured to be (1.13±0.08stat±0.03syst)×10−3. The ratio of branching fractions of D+→K+π+π−π0 over D+→K−π+π+π0 is found to be (1.81±0.15)%, which corresponds to (6.28±0.52)tan4θC, where θC is the Cabibbo mixing angle. This ratio is significantly larger than the corresponding ratios for other doubly Cabibbo-suppressed decays. The asymmetry of the branching fractions of charge-conjugated decays D±→K±π±π∓π0 is also determined, and no evidence for CP violation is found. In addition, the first evidence for the D+→K+ω decay, with a statistical significance of 3.3σ, is presented and the branching fraction is measured to be B(D+→K+ω)=(5.7−2.1+2.5stat±0.2syst)×10−5.

关键词： Branching fraction Hadronic decays Charmed mesons Light mesons CP violation Lepton colliders

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Measurement of Proton Electromagnetic Form Factors in e+e−→pp¯ in the Energy Region 2.00–3.08 GeV

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Physical Review Letters 2020年第4期124卷 042001-042001页

作者： M. Ablikim M. N. Achasov P. Adlarson S. Ahmed M. Albrecht M. Alekseev A. Amoroso F. F. An Q. An Anita Y. Bai O. Bakina R. Baldini Ferroli I. Balossino Y. Ban K. Begzsuren J. V. Bennett N. Berger M. Bertani D. Bettoni F. Bianchi J. Biernat J. Bloms I. Boyko R. A. Briere H. Cai X. Cai A. Calcaterra G. F. Cao N. Cao S. A. Cetin J. Chai J. F. Chang W. L. Chang G. Chelkov D. Y. Chen G. Chen H. S. Chen J. Chen M. L. Chen S. J. Chen X. R. Chen Y. B. Chen W. Cheng G. Cibinetto F. Cossio X. F. Cui H. L. Dai J. P. Dai X. C. Dai A. Dbeyssi D. Dedovich Z. Y. Deng A. Denig I. Denysenko M. Destefanis F. De Mori Y. Ding C. Dong J. Dong L. Y. Dong M. Y. Dong S. X. Du J. Fang S. S. Fang Y. Fang R. Farinelli L. Fava F. Feldbauer G. Felici C. Q. Feng M. Fritsch C. D. Fu Y. Fu Q. Gao Y. Gao Y. G. Gao B. Garillon I. Garzia E. M. Gersabeck A. Gilman K. Goetzen L. Gong W. X. Gong W. Gradl M. Greco L. M. Gu M. H. Gu S. Gu Y. T. Gu C. Y. Guan A. Q. Guo L. B. Guo R. P. Guo Y. P. Guo A. Guskov S. Han T. Z. Han X. Q. Hao F. A. Harris K. L. He F. H. Heinsius T. Held Y. K. Heng M. Himmelreich Y. R. Hou Z. L. Hou H. M. Hu J. F. Hu T. Hu Y. Hu G. S. Huang J. S. Huang L. Q. Huang X. T. Huang N. Huesken T. Hussain W. Ikegami Andersson W. Imoehl M. Irshad Q. Ji Q. P. Ji X. B. Ji X. L. Ji H. L. Jiang X. S. Jiang X. Y. Jiang J. B. Jiao Z. Jiao D. P. Jin S. Jin Y. Jin T. Johansson N. Kalantar-Nayestanaki X. S. Kang R. Kappert M. Kavatsyuk B. C. Ke I. K. Keshk A. Khoukaz P. Kiese R. Kiuchi R. Kliemt L. Koch O. B. Kolcu B. Kopf M. Kuemmel M. Kuessner A. Kupsc M. Kurth M. G. Kurth W. Kühn J. S. Lange P. Larin L. Lavezzi H. Leithoff T. Lenz C. Li C. H. Li Cheng Li D. M. Li F. Li G. Li H. B. Li H. J. Li J. C. Li Ke Li L. K. Li Lei Li P. L. Li P. R. Li W. D. Li W. G. Li X. H. Li X. L. Li X. N. Li Z. B. Li Z. Y. Li H. Liang Y. F. Liang Y. T. Liang L. Z. Liao J. Libby C. X. Lin D. X. Lin B. Liu B. J. Liu C. X. Liu D. Liu D. Y. Liu F. H. Liu Fang Liu Feng Liu H. B. Liu H. M. Liu Huanhuan Liu Huihui Liu J. B. Liu J. Y. Liu K. Liu K. Y. Liu Ke Liu L. Liu L. Y. Institute of High Energy Physics Beijing 100049 People’s Republic of China G.I. Budker Institute of Nuclear Physics SB RAS (BINP) Novosibirsk 630090 Russia Uppsala University Box 516 SE-75120 Uppsala Sweden Helmholtz Institute Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany Bochum Ruhr-University D-44780 Bochum Germany University of Turin I-10125 Turin Italy INFN I-10125 Turin Italy University of Science and Technology of China Hefei 230026 People’s Republic of China State Key Laboratory of Particle Detection and Electronics Beijing 100049 Hefei 230026 People’s Republic of China Indian Institute of Technology Madras Chennai 600036 India Southeast University Nanjing 211100 People’s Republic of China Joint Institute for Nuclear Research 141980 Dubna Moscow region Russia INFN Laboratori Nazionali di Frascati I-00044 Frascati Italy INFN Sezione di Ferrara I-44122 Ferrara Italy Peking University Beijing 100871 People’s Republic of China Institute of Physics and Technology Peace Avenue 54B Ulaanbaatar 13330 Mongolia Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany University of Muenster Wilhelm-Klemm-Strasse 9 48149 Muenster Germany Wuhan University Wuhan 430072 People’s Republic of China University of Chinese Academy of Sciences Beijing 100049 People’s Republic of China Istanbul Bilgi University 34060 Eyup Istanbul Turkey Central China Normal University Wuhan 430079 People’s Republic of China Henan Normal University Xinxiang 453007 People’s Republic of China Nanjing University Nanjing 210093 People’s Republic of China Institute of Modern Physics Lanzhou 730000 People’s Republic of China Nankai University Tianjin 300071 People’s Republic of China Shanghai Jiao Tong University Shanghai 200240 People’s Republic of China Liaoning University Shenyang 110036 People’s Republic of China Zhengzhou University Zhengzhou 450001 People’s Republic of Chin

The process of e+e−→pp¯ is studied at 22 center-of-mass energy points (s) from 2.00 to 3.08 GeV, exploiting 688.5 pb−1 of data collected with the BESIII detector operating at the BEPCII collider. The Born cross section (σpp¯) of e+e−→pp¯ is measured with the energy-scan technique and it is found to be consistent with previously published data, but with much improved accuracy. In addition, the electromagnetic form-factor ratio (|GE/GM|) and the value of the effective (|Geff|), electric (|GE|), and magnetic (|GM|) form factors are measured by studying the helicity angle of the proton at 16 center-of-mass energy points. |GE/GM| and |GM| are determined with high accuracy, providing uncertainties comparable to data in the spacelike region, and |GE| is measured for the first time. We reach unprecedented accuracy, and precision results in the timelike region provide information to improve our understanding of the proton inner structure and to test theoretical models which depend on nonperturbative quantum chromodynamics.

关键词： Form factors Particle interactions Quantum chromodynamics Quark model

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Determination of Strong-Phase Parameters in D→KS,L0π+π−

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Physical Review Letters 2020年第24期124卷 241802-241802页

作者： M. Ablikim M. N. Achasov P. Adlarson S. Ahmed M. Albrecht M. Alekseev D. Ambrose A. Amoroso F. F. An Q. An Anita Y. Bai O. Bakina R. Baldini Ferroli I. Balossino Y. Ban K. Begzsuren J. V. Bennett N. Berger M. Bertani D. Bettoni F. Bianchi J. Biernat J. Bloms I. Boyko R. A. Briere H. Cai X. Cai A. Calcaterra G. F. Cao N. Cao S. A. Cetin J. Chai J. F. Chang W. L. Chang G. Chelkov D. Y. Chen G. Chen H. S. Chen J. Chen J. C. Chen M. L. Chen S. J. Chen Y. B. Chen W. Cheng G. Cibinetto F. Cossio X. F. Cui H. L. Dai J. P. Dai X. C. Dai A. Dbeyssi D. Dedovich Z. Y. Deng A. Denig I. Denysenko M. Destefanis F. De Mori Y. Ding C. Dong J. Dong L. Y. Dong M. Y. Dong Z. L. Dou S. X. Du J. Z. Fan J. Fang S. S. Fang Y. Fang R. Farinelli L. Fava F. Feldbauer G. Felici C. Q. Feng M. Fritsch C. D. Fu Y. Fu Q. Gao X. L. Gao Y. Gao Y. G. Gao Z. Gao B. Garillon I. Garzia E. M. Gersabeck A. Gilman K. Goetzen L. Gong W. X. Gong W. Gradl M. Greco L. M. Gu M. H. Gu S. Gu Y. T. Gu A. Q. Guo L. B. Guo R. P. Guo Y. P. Guo A. Guskov S. Han X. Q. Hao F. A. Harris K. L. He F. H. Heinsius T. Held Y. K. Heng M. Himmelreich Y. R. Hou Z. L. Hou H. M. Hu J. F. Hu T. Hu Y. Hu G. S. Huang J. S. Huang X. T. Huang X. Z. Huang N. Huesken T. Hussain W. Ikegami Andersson W. Imoehl M. Irshad Q. Ji Q. P. Ji X. B. Ji X. L. Ji H. L. Jiang X. S. Jiang X. Y. Jiang J. B. Jiao Z. Jiao D. P. Jin S. Jin Y. Jin T. Johansson N. Kalantar-Nayestanaki X. S. Kang R. Kappert M. Kavatsyuk B. C. Ke I. K. Keshk A. Khoukaz P. Kiese R. Kiuchi R. Kliemt L. Koch O. B. Kolcu B. Kopf M. Kuemmel M. Kuessner A. Kupsc M. Kurth M. G. Kurth W. Kühn J. S. Lange P. Larin L. Lavezzi H. Leithoff T. Lenz C. Li Cheng Li D. M. Li F. Li F. Y. Li G. Li H. B. Li H. J. Li J. C. Li J. W. Li Ke Li L. K. Li Lei Li P. L. Li P. R. Li Q. Y. Li W. D. Li W. G. Li X. H. Li X. L. Li X. N. Li Z. B. Li Z. Y. Li H. Liang Y. F. Liang Y. T. Liang G. R. Liao L. Z. Liao J. Libby C. X. Lin D. X. Lin Y. J. Lin B. Liu B. J. Liu C. X. Liu D. Liu D. Y. Liu F. H. Liu Fang Liu Feng Liu H. B. Liu H. M. Liu Huanhuan Liu Hu Institute of High Energy Physics Beijing 100049 People’s Republic of China G.I. Budker Institute of Nuclear Physics SB RAS (BINP) Novosibirsk 630090 Russia Uppsala University Box 516 SE-75120 Uppsala Sweden Helmholtz Institute Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany Bochum Ruhr-University D-44780 Bochum Germany University of Turin I-10125 Turin Italy INFN I-10125 Turin Italy University of Minnesota Minneapolis Minnesota 55455 USA University of Science and Technology of China Hefei 230026 People’s Republic of China State Key Laboratory of Particle Detection and Electronics Beijing 100049 Hefei 230026 People’s Republic of China Indian Institute of Technology Madras Chennai 600036 India Southeast University Nanjing 211100 People’s Republic of China Joint Institute for Nuclear Research 141980 Dubna Moscow region Russia INFN Laboratori Nazionali di Frascati I-00044 Frascati Italy INFN Sezione di Ferrara I-44122 Ferrara Italy Peking University Beijing 100871 People’s Republic of China Institute of Physics and Technology Peace Ave. 54B Ulaanbaatar 13330 Mongolia Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany University of Muenster Wilhelm-Klemm-Str. 9 48149 Muenster Germany Wuhan University Wuhan 430072 People’s Republic of China University of Chinese Academy of Sciences Beijing 100049 People’s Republic of China Istanbul Bilgi University 34060 Eyup Istanbul Turkey Central China Normal University Wuhan 430079 People’s Republic of China Henan Normal University Xinxiang 453007 People’s Republic of China Nanjing University Nanjing 210093 People’s Republic of China Nankai University Tianjin 300071 People’s Republic of China Shanghai Jiao Tong University Shanghai 200240 People’s Republic of China Liaoning University Shenyang 110036 People’s Republic of China Zhengzhou University Zhengzhou 450001 People’s Republic of China Tsinghua Uni

We report the most precise measurements to date of the strong-phase parameters between D0 and D¯0 decays to KS,L0π+π− using a sample of 2.93 fb−1 of e+e− annihilation data collected at a center-of-mass energy of 3.773 GeV with the BESIII detector at the BEPCII collider. Our results provide the key inputs for a binned model-independent determination of the Cabibbo-Kobayashi-Maskawa angle γ/ϕ3 with B decays. Using our results, the decay model sensitivity to the γ/ϕ3 measurement is expected to be between 0.7° and 1.2°, approximately a factor of three smaller than that achievable with previous measurements, based on the studies of the simulated data. The improved precision of this work ensures that measurements of γ/ϕ3 will not be limited by knowledge of strong phases for the next decade. Furthermore, our results provide critical input for other flavor-physics investigations, including charm mixing, other measurements of CP violation, and the measurement of strong-phase parameters for other D-decay modes.

关键词： Hadronic decays Charm quark Charmed mesons

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Measurement of the Cross Section for e+e−→Ξ−Ξ¯+ and Observation of an Excited Ξ Baryon

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Physical Review Letters 2020年第3期124卷 032002-032002页

作者： M. Ablikim M. N. Achasov P. Adlarson S. Ahmed M. Albrecht M. Alekseev A. Amoroso F. F. An Q. An Y. Bai O. Bakina R. Baldini Ferroli I. Balossino Y. Ban K. Begzsuren J. V. Bennett N. Berger M. Bertani D. Bettoni F. Bianchi J. Biernat J. Bloms I. Boyko R. A. Briere H. Cai X. Cai A. Calcaterra G. F. Cao N. Cao S. A. Cetin J. Chai J. F. Chang W. L. Chang G. Chelkov D. Y. Chen G. Chen H. S. Chen J. C. Chen M. L. Chen S. J. Chen Y. B. Chen W. Cheng G. Cibinetto F. Cossio X. F. Cui H. L. Dai J. P. Dai X. C. Dai A. Dbeyssi D. Dedovich Z. Y. Deng A. Denig I. Denysenko M. Destefanis F. De Mori Y. Ding C. Dong J. Dong L. Y. Dong M. Y. Dong Z. L. Dou S. X. Du J. Z. Fan J. Fang S. S. Fang Y. Fang R. Farinelli L. Fava F. Feldbauer G. Felici C. Q. Feng M. Fritsch C. D. Fu Y. Fu Q. Gao X. L. Gao Y. Gao Y. G. Gao Z. Gao B. Garillon I. Garzia E. M. Gersabeck A. Gilman K. Goetzen L. Gong W. X. Gong W. Gradl M. Greco L. M. Gu M. H. Gu S. Gu Y. T. Gu A. Q. Guo L. B. Guo R. P. Guo Y. P. Guo A. Guskov S. Han X. Q. Hao F. A. Harris K. L. He F. H. Heinsius T. Held Y. K. Heng M. Himmelreich Y. R. Hou Z. L. Hou H. M. Hu J. F. Hu T. Hu Y. Hu G. S. Huang J. S. Huang X. T. Huang X. Z. Huang N. Huesken T. Hussain W. Ikegami Andersson W. Imoehl M. Irshad Q. Ji Q. P. Ji X. B. Ji X. L. Ji H. L. Jiang X. S. Jiang X. Y. Jiang J. B. Jiao Z. Jiao D. P. Jin S. Jin Y. Jin T. Johansson N. Kalantar-Nayestanaki X. S. Kang R. Kappert M. Kavatsyuk B. C. Ke I. K. Keshk A. Khoukaz P. Kiese R. Kiuchi R. Kliemt L. Koch O. B. Kolcu B. Kopf M. Kuemmel M. Kuessner A. Kupsc M. Kurth M. G. Kurth W. Kühn J. S. Lange P. Larin L. Lavezzi H. Leithoff T. Lenz C. Li Cheng Li D. M. Li F. Li F. Y. Li G. Li H. B. Li H. J. Li J. C. Li J. W. Li Ke Li L. K. Li Lei Li P. L. Li P. R. Li Q. Y. Li W. D. Li W. G. Li X. H. Li X. L. Li X. N. Li Z. B. Li Z. Y. Li H. Liang Y. F. Liang Y. T. Liang G. R. Liao L. Z. Liao J. Libby C. X. Lin D. X. Lin Y. J. Lin B. Liu B. J. Liu C. X. Liu D. Liu D. Y. Liu F. H. Liu Fang Liu Feng Liu H. B. Liu H. M. Liu Huanhuan Liu Huihui Liu J. B. Liu J. Y. Institute of High Energy Physics Beijing 100049 People’s Republic of China G.I. Budker Institute of Nuclear Physics SB RAS (BINP) Novosibirsk 630090 Russia Uppsala University Box 516 SE-75120 Uppsala Sweden Helmholtz Institute Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany Bochum Ruhr-University D-44780 Bochum Germany University of Turin I-10125 Turin Italy INFN I-10125 Turin Italy University of Science and Technology of China Hefei 230026 People’s Republic of China State Key Laboratory of Particle Detection and Electronics Beijing 100049 Hefei 230026 People’s Republic of China Southeast University Nanjing 211100 People’s Republic of China Joint Institute for Nuclear Research 141980 Dubna Moscow region Russia INFN Laboratori Nazionali di Frascati I-00044 Frascati Italy INFN Sezione di Ferrara I-44122 Ferrara Italy Peking University Beijing 100871 People’s Republic of China Institute of Physics and Technology Peace Ave. 54B Ulaanbaatar 13330 Mongolia Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany University of Muenster Wilhelm-Klemm-Str. 9 48149 Muenster Germany Wuhan University Wuhan 430072 People’s Republic of China University of Chinese Academy of Sciences Beijing 100049 People’s Republic of China Istanbul Bilgi University 34060 Eyup Istanbul Turkey Central China Normal University Wuhan 430079 People’s Republic of China Nanjing University Nanjing 210093 People’s Republic of China Nankai University Tianjin 300071 People’s Republic of China Shanghai Jiao Tong University Shanghai 200240 People’s Republic of China Liaoning University Shenyang 110036 People’s Republic of China Zhengzhou University Zhengzhou 450001 People’s Republic of China Tsinghua University Beijing 100084 People’s Republic of China University of Ferrara I-44122 Ferrara Italy University of Eastern Piedmont I-15121 Alessandria Italy University of Manchester Oxfo

Using a total of 11.0 fb−1 of e+e− collision data with center-of-mass energies between 4.009 and 4.6 GeV and collected with the BESIII detector at BEPCII, we measure fifteen exclusive cross sections and effective form factors for the process e+e−→Ξ−Ξ¯+ by means of a single baryon-tag method. After performing a fit to the dressed cross section of e+e−→Ξ−Ξ¯+, no significant ψ(4230) or ψ(4260) resonance is observed in the Ξ−Ξ¯+ final states, and upper limits at the 90% confidence level on ΓeeB for the processes ψ(4230)/ψ(4260)→Ξ−Ξ¯+ are determined. In addition, an excited Ξ baryon at 1820 MeV/c2 is observed with a statistical significance of 6.2–6.5σ by including the systematic uncertainty, and the mass and width are measured to be M=(1825.5±4.7±4.7) MeV/c2 and Γ=(17.0±15.0±7.9) MeV, which confirms the existence of the JP=32− state Ξ(1820).

关键词： Particle decays Baryons Hadrons

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First Observation of D+→ημ+νμ and Measurement of Its Decay Dynamics

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Physical Review Letters 2020年第23期124卷 231801-231801页

作者： M. Ablikim M. N. Achasov P. Adlarson S. Ahmed M. Albrecht A. Amoroso Q. An Anita X. H. Bai Y. Bai O. Bakina R. Baldini Ferroli I. Balossino Y. Ban K. Begzsuren J. V. Bennett N. Berger M. Bertani D. Bettoni F. Bianchi J. Biernat J. Bloms A. Bortone I. Boyko R. A. Briere H. Cai X. Cai A. Calcaterra G. F. Cao N. Cao S. A. Cetin J. F. Chang W. L. Chang G. Chelkov D. Y. Chen G. Chen H. S. Chen M. L. Chen S. J. Chen X. R. Chen Y. B. Chen W. S. Cheng G. Cibinetto F. Cossio X. F. Cui H. L. Dai J. P. Dai X. C. Dai A. Dbeyssi R. B. de Boer D. Dedovich Z. Y. Deng A. Denig I. Denysenko M. Destefanis F. De Mori Y. Ding C. Dong J. Dong L. Y. Dong M. Y. Dong S. X. Du J. Fang S. S. Fang Y. Fang R. Farinelli L. Fava F. Feldbauer G. Felici C. Q. Feng M. Fritsch C. D. Fu Y. Fu X. L. Gao Y. Gao Y. G. Gao I. Garzia E. M. Gersabeck A. Gilman K. Goetzen L. Gong W. X. Gong W. Gradl M. Greco L. M. Gu M. H. Gu S. Gu Y. T. Gu C. Y. Guan A. Q. Guo L. B. Guo R. P. Guo Y. P. Guo A. Guskov S. Han T. T. Han T. Z. Han X. Q. Hao F. A. Harris K. L. He F. H. Heinsius T. Held Y. K. Heng M. Himmelreich T. Holtmann Y. R. Hou Z. L. Hou H. M. Hu J. F. Hu T. Hu Y. Hu G. S. Huang L. Q. Huang X. T. Huang Y. P. Huang Z. Huang N. Huesken T. Hussain W. Ikegami Andersson W. Imoehl M. Irshad S. Jaeger S. Janchiv Q. Ji Q. P. Ji X. B. Ji X. L. Ji H. B. Jiang X. S. Jiang X. Y. Jiang J. B. Jiao Z. Jiao S. Jin Y. Jin T. Johansson N. Kalantar-Nayestanaki X. S. Kang R. Kappert M. Kavatsyuk B. C. Ke I. K. Keshk A. Khoukaz P. Kiese R. Kiuchi R. Kliemt L. Koch O. B. Kolcu B. Kopf M. Kuemmel M. Kuessner A. Kupsc M. G. Kurth W. Kühn J. J. Lane J. S. Lange P. Larin L. Lavezzi H. Leithoff M. Lellmann T. Lenz C. Li C. H. Li Cheng Li D. M. Li F. Li G. Li H. B. Li H. J. Li J. L. Li J. Q. Li Ke Li L. K. Li Lei Li P. L. Li P. R. Li S. Y. Li W. D. Li W. G. Li X. H. Li X. L. Li Z. B. Li Z. Y. Li H. Liang Y. F. Liang Y. T. Liang L. Z. Liao J. Libby C. X. Lin B. Liu B. J. Liu C. X. Liu D. Liu D. Y. Liu F. H. Liu Fang Liu Feng Liu H. B. Liu H. M. Liu Huanhuan Liu Huihui Liu J. B. Liu Institute of High Energy Physics Beijing 100049 People’s Republic of China G.I. Budker Institute of Nuclear Physics SB RAS (BINP) Novosibirsk 630090 Russia Uppsala University Box 516 SE-75120 Uppsala Sweden Helmholtz Institute Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany Bochum Ruhr-University D-44780 Bochum Germany University of Turin I-10125 Turin Italy INFN I-10125 Turin Italy University of Science and Technology of China Hefei 230026 People’s Republic of China State Key Laboratory of Particle Detection and Electronics Beijing 100049 Hefei 230026 People’s Republic of China Indian Institute of Technology Madras Chennai 600036 India University of Jinan Jinan 250022 People’s Republic of China Southeast University Nanjing 211100 People’s Republic of China Joint Institute for Nuclear Research 141980 Dubna Moscow region Russia INFN Laboratori Nazionali di Frascati I-00044 Frascati Italy INFN Sezione di Ferrara I-44122 Ferrara Italy Peking University Beijing 100871 People’s Republic of China Institute of Physics and Technology Peace Ave. 54B Ulaanbaatar 13330 Mongolia Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany University of Muenster Wilhelm-Klemm-Str. 9 48149 Muenster Germany Wuhan University Wuhan 430072 People’s Republic of China University of Chinese Academy of Sciences Beijing 100049 People’s Republic of China Istanbul Bilgi University 34060 Eyup Istanbul Turkey Central China Normal University Wuhan 430079 People’s Republic of China Nanjing University Nanjing 210093 People’s Republic of China Institute of Modern Physics Lanzhou 730000 People’s Republic of China Nankai University Tianjin 300071 People’s Republic of China Shanghai Jiao Tong University Shanghai 200240 People’s Republic of China Liaoning University Shenyang 110036 People’s Republic of China Zhengzhou University Zhengzhou 450001 People’s Republic of China Univer

By analyzing a data sample corresponding to an integrated luminosity of 2.93 fb−1 collected at a center-of-mass energy of 3.773 GeV with the BESIII detector, we measure for the first time the absolute branching fraction of the D+→ημ+νμ decay to be BD+→ημ+νμ=(10.4±1.0stat±0.5syst)×10−4. Using the world averaged value of BD+→ηe+νe, the ratio of the two branching fractions is determined to be BD+→ημ+νμ/BD+→ηe+νe=0.91±0.13(stat+syst), which agrees with the theoretical expectation of lepton flavor universality within uncertainty. By studying the differential decay rates in five four-momentum transfer intervals, we obtain the product of the hadronic form factor f+η(0) and the c→d Cabibbo-Kobayashi-Maskawa matrix element |Vcd| to be f+η(0)|Vcd|=0.087±0.008stat±0.002syst. Taking the input of |Vcd| from the global fit in the standard model, we determine f+η(0)=0.39±0.04stat±0.01syst. On the other hand, using the value of f+η(0) calculated in theory, we find |Vcd|=0.242±0.022stat±0.006syst±0.033theory.

关键词： Branching fraction Leptonic, semileptonic & radiative decays Particle interactions Charmed mesons Quark mixing Flavor symmetries Form factors Lepton colliders

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Measurements of Absolute Branching Fractions of Fourteen Exclusive Hadronic D Decays to η

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Physical Review Letters 2020年第24期124卷 241803-241803页

作者： M. Ablikim M. N. Achasov P. Adlarson S. Ahmed M. Albrecht A. Amoroso Q. An Anita X. H. Bai Y. Bai O. Bakina R. Baldini Ferroli I. Balossino Y. Ban K. Begzsuren J. V. Bennett N. Berger M. Bertani D. Bettoni F. Bianchi J. Biernat J. Bloms A. Bortone I. Boyko R. A. Briere H. Cai X. Cai A. Calcaterra G. F. Cao N. Cao S. A. Cetin J. F. Chang W. L. Chang G. Chelkov D. Y. Chen G. Chen H. S. Chen M. L. Chen S. J. Chen X. R. Chen Y. B. Chen W. S. Cheng G. Cibinetto F. Cossio X. F. Cui H. L. Dai J. P. Dai X. C. Dai A. Dbeyssi R. B. de Boer D. Dedovich Z. Y. Deng A. Denig I. Denysenko M. Destefanis F. De Mori Y. Ding C. Dong J. Dong L. Y. Dong M. Y. Dong S. X. Du J. Fang S. S. Fang Y. Fang R. Farinelli L. Fava F. Feldbauer G. Felici C. Q. Feng M. Fritsch C. D. Fu Y. Fu X. L. Gao Y. Gao Y. G. Gao I. Garzia E. M. Gersabeck A. Gilman K. Goetzen L. Gong W. X. Gong W. Gradl M. Greco L. M. Gu M. H. Gu S. Gu Y. T. Gu C. Y. Guan A. Q. Guo L. B. Guo R. P. Guo Y. P. Guo A. Guskov S. Han T. T. Han T. Z. Han X. Q. Hao F. A. Harris K. L. He F. H. Heinsius T. Held Y. K. Heng M. Himmelreich T. Holtmann Y. R. Hou Z. L. Hou H. M. Hu J. F. Hu T. Hu Y. Hu G. S. Huang L. Q. Huang X. T. Huang Y. P. Huang Z. Huang N. Huesken T. Hussain W. Ikegami Andersson W. Imoehl M. Irshad S. Jaeger S. Janchiv Q. Ji Q. P. Ji X. B. Ji X. L. Ji H. B. Jiang X. S. Jiang X. Y. Jiang J. B. Jiao Z. Jiao S. Jin Y. Jin T. Johansson N. Kalantar-Nayestanaki X. S. Kang R. Kappert M. Kavatsyuk B. C. Ke I. K. Keshk A. Khoukaz P. Kiese R. Kiuchi R. Kliemt L. Koch O. B. Kolcu B. Kopf M. Kuemmel M. Kuessner A. Kupsc M. G. Kurth W. Kühn J. J. Lane J. S. Lange P. Larin L. Lavezzi H. Leithoff M. Lellmann T. Lenz C. Li C. H. Li Cheng Li D. M. Li F. Li G. Li H. B. Li H. J. Li J. L. Li J. Q. Li Ke Li L. K. Li Lei Li P. L. Li P. R. Li S. Y. Li W. D. Li W. G. Li X. H. Li X. L. Li Z. B. Li Z. Y. Li H. Liang Y. F. Liang Y. T. Liang L. Z. Liao J. Libby C. X. Lin B. Liu B. J. Liu C. X. Liu D. Liu D. Y. Liu F. H. Liu Fang Liu Feng Liu H. B. Liu H. M. Liu Huanhuan Liu Huihui Liu J. B. Liu Institute of High Energy Physics Beijing 100049 People’s Republic of China G.I. Budker Institute of Nuclear Physics SB RAS (BINP) Novosibirsk 630090 Russia Uppsala University Box 516 SE-75120 Uppsala Sweden Helmholtz Institute Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany Bochum Ruhr-University D-44780 Bochum Germany University of Turin I-10125 Turin Italy INFN I-10125 Turin Italy University of Science and Technology of China Hefei 230026 People’s Republic of China State Key Laboratory of Particle Detection and Electronics Beijing 100049 Hefei 230026 People’s Republic of China Indian Institute of Technology Madras Chennai 600036 India University of Jinan Jinan 250022 People’s Republic of China Southeast University Nanjing 211100 People’s Republic of China Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia INFN Laboratori Nazionali di Frascati I-00044 Frascati Italy INFN Sezione di Ferrara I-44122 Ferrara Italy Peking University Beijing 100871 People’s Republic of China Institute of Physics and Technology Peace Avenue 54B Ulaanbaatar 13330 Mongolia Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany University of Muenster Wilhelm-Klemm-Strasse 9 48149 Muenster Germany Wuhan University Wuhan 430072 People’s Republic of China University of Chinese Academy of Sciences Beijing 100049 People’s Republic of China Istanbul Bilgi University 34060 Eyup Istanbul Turkey Central China Normal University Wuhan 430079 People’s Republic of China Nanjing University Nanjing 210093 People’s Republic of China Institute of Modern Physics Lanzhou 730000 People’s Republic of China Nankai University Tianjin 300071 People’s Republic of China Shanghai Jiao Tong University Shanghai 200240 People’s Republic of China Liaoning University Shenyang 110036 People’s Republic of China Zhengzhou University Zhengzhou 450001 People’s Republic of China U

Using 2.93 fb−1 of e+e− collision data taken at a center-of-mass energy of 3.773 GeV with the BESIII detector, we report the first measurements of the absolute branching fractions of 14 hadronic D0(+) decays to exclusive final states with an η, e.g., D0→K−π+η, KS0π0η, K+K−η, KS0KS0η, K−π+π0η, KS0π+π−η, KS0π0π0η, and π+π−π0η; D+→KS0π+η, KS0K+η, K−π+π+η, KS0π+π0η, π+π+π−η, and π+π0π0η. Among these decays, the D0→K−π+η and D+→KS0π+η decays have the largest branching fractions, which are B(D0→K−π+η)=(1.853±0.025stat±0.031syst)% and B(D+→KS0π+η)=(1.309±0.037stat±0.031syst)%, respectively. The charge-parity asymmetries for the six decays with highest event yields are determined, and no statistically significant charge-parity violation is found.

关键词： Branching fraction Hadronic decays Charmed mesons Light mesons

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Observation of a Resonant Structure in e+e−→K+K−π0π0

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Physical Review Letters 2020年第11期124卷 112001-112001页

作者： M. Ablikim M. N. Achasov P. Adlarson S. Ahmed M. Albrecht A. Amoroso Q. An Anita Y. Bai O. Bakina R. Baldini Ferroli I. Balossino Y. Ban K. Begzsuren J. V. Bennett N. Berger M. Bertani D. Bettoni F. Bianchi J. Biernat J. Bloms I. Boyko R. A. Briere H. Cai X. Cai A. Calcaterra G. F. Cao N. Cao S. A. Cetin J. F. Chang W. L. Chang G. Chelkov D. Y. Chen G. Chen H. S. Chen M. L. Chen S. J. Chen X. R. Chen Y. B. Chen W. Cheng G. Cibinetto F. Cossio X. F. Cui H. L. Dai J. P. Dai X. C. Dai A. Dbeyssi D. Dedovich Z. Y. Deng A. Denig I. Denysenko M. Destefanis F. De Mori Y. Ding C. Dong J. Dong L. Y. Dong M. Y. Dong S. X. Du J. Fang S. S. Fang Y. Fang R. Farinelli L. Fava F. Feldbauer G. Felici C. Q. Feng M. Fritsch C. D. Fu Y. Fu X. L. Gao Y. Gao Y. G. Gao I. Garzia E. M. Gersabeck A. Gilman K. Goetzen L. Gong W. X. Gong W. Gradl M. Greco L. M. Gu M. H. Gu S. Gu Y. T. Gu C. Y. Guan A. Q. Guo L. B. Guo R. P. Guo Y. P. Guo A. Guskov S. Han T. T. Han T. Z. Han X. Q. Hao F. A. Harris K. L. He F. H. Heinsius T. Held Y. K. Heng M. Himmelreich T. Holtmann Y. R. Hou Z. L. Hou H. M. Hu J. F. Hu T. Hu Y. Hu G. S. Huang L. Q. Huang X. T. Huang N. Huesken T. Hussain W. Ikegami Andersson W. Imoehl M. Irshad S. Jaeger S. Janchiv Q. Ji Q. P. Ji X. B. Ji X. L. Ji H. B. Jiang X. S. Jiang X. Y. Jiang J. B. Jiao Z. Jiao D. P. Jin S. Jin Y. Jin T. Johansson N. Kalantar-Nayestanaki X. S. Kang R. Kappert M. Kavatsyuk B. C. Ke I. K. Keshk A. Khoukaz P. Kiese R. Kiuchi R. Kliemt L. Koch O. B. Kolcu B. Kopf M. Kuemmel M. Kuessner A. Kupsc M. G. Kurth W. Kühn J. J. Lane J. S. Lange P. Larin L. Lavezzi H. Leithoff M. Lellmann T. Lenz C. Li C. H. Li Cheng Li D. M. Li F. Li G. Li H. B. Li H. J. Li J. C. Li J. L. Li Ke Li L. K. Li Lei Li P. L. Li P. R. Li S. Y. Li W. D. Li W. G. Li X. H. Li X. L. Li X. N. Li Z. B. Li Z. Y. Li H. Liang Y. F. Liang Y. T. Liang L. Z. Liao J. Libby C. X. Lin D. X. Lin B. Liu B. J. Liu C. X. Liu D. Liu D. Y. Liu F. H. Liu Fang Liu Feng Liu H. B. Liu H. M. Liu Huanhuan Liu Huihui Liu J. B. Liu J. Y. Liu K. Liu K. Y. Liu Ke Institute of High Energy Physics Beijing 100049 People’s Republic of China G.I. Budker Institute of Nuclear Physics SB RAS (BINP) Novosibirsk 630090 Russia Uppsala University Box 516 SE-75120 Uppsala Sweden Helmholtz Institute Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany Bochum Ruhr-University D-44780 Bochum Germany University of Turin I-10125 Turin Italy INFN I-10125 Turin Italy University of Science and Technology of China Hefei 230026 People’s Republic of China State Key Laboratory of Particle Detection and Electronics Beijing 100049 Hefei 230026 People’s Republic of China Indian Institute of Technology Madras Chennai 600036 India Southeast University Nanjing 211100 People’s Republic of China Joint Institute for Nuclear Research Dubna 141980 Moscow region Russia INFN Laboratori Nazionali di Frascati I-00044 Frascati Italy INFN Sezione di Ferrara I-44122 Ferrara Italy Peking University Beijing 100871 People’s Republic of China Institute of Physics and Technology Peace Avenue 54B Ulaanbaatar 13330 Mongolia Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany University of Muenster Wilhelm-Klemm-Straße 9 48149 Muenster Germany Wuhan University Wuhan 430072 People’s Republic of China University of Chinese Academy of Sciences Beijing 100049 People’s Republic of China Istanbul Bilgi University 34060 Eyup Istanbul Turkey Central China Normal University Wuhan 430079 People’s Republic of China Nanjing University Nanjing 210093 People’s Republic of China Institute of Modern Physics Lanzhou 730000 People’s Republic of China Nankai University Tianjin 300071 People’s Republic of China Shanghai Jiao Tong University Shanghai 200240 People’s Republic of China Liaoning University Shenyang 110036 People’s Republic of China Zhengzhou University Zhengzhou 450001 People’s Republic of China University of Ferrara I-44122 Ferrara Italy University of Eastern

A partial-wave analysis is performed for the process e+e−→K+K−π0π0 at the center-of-mass energies ranging from 2.000 to 2.644 GeV. The data samples of e+e− collisions, collected by the BESIII detector at the BEPCII collider with a total integrated luminosity of 300 pb−1, are analyzed. The total Born cross sections for the process e+e−→K+K−π0π0, as well as the Born cross sections for the subprocesses e+e−→ϕπ0π0, K+(1460)K−, K1+(1400)K−, K1+(1270)K−, and K*+(892)K*−(892), are measured versus the center-of-mass energy. The corresponding results for e+e−→K+K−π0π0 and ϕπ0π0 are consistent with those of BABAR with better precision. By analyzing the cross sections for the four subprocesses, K+(1460)K−, K1+(1400)K−, K1+(1270)K−, and K*+(892)K*−(892), a structure with mass M=(2126.5±16.8±12.4) MeV/c2 and width Γ=(106.9±32.1±28.1) MeV is observed with an overall statistical significance of 6.3σ, although with very limited significance in the subprocesses e+e−→K1+(1270)K− and K*+(892)K*−(892). The resonant parameters of the observed structure suggest it can be identified with the ϕ(2170), thus the results provide valuable input to the internal nature of the ϕ(2170).

关键词： Particle phenomena Particle production

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Study of Open-Charm Decays and Radiative Transitions of the X(3872)

引用

Physical Review Letters 2020年第24期124卷 242001-242001页

作者： M. Ablikim M. N. Achasov P. Adlarson S. Ahmed M. Albrecht A. Amoroso Q. An Anita Y. Bai O. Bakina R. Baldini Ferroli I. Balossino Y. Ban K. Begzsuren J. V. Bennett N. Berger M. Bertani D. Bettoni F. Bianchi J. Biernat J. Bloms A. Bortone I. Boyko R. A. Briere H. Cai X. Cai A. Calcaterra G. F. Cao N. Cao S. A. Cetin J. F. Chang W. L. Chang G. Chelkov D. Y. Chen G. Chen H. S. Chen M. L. Chen S. J. Chen X. R. Chen Y. B. Chen W. Cheng G. Cibinetto F. Cossio X. F. Cui H. L. Dai J. P. Dai X. C. Dai A. Dbeyssi R. B. de Boer D. Dedovich Z. Y. Deng A. Denig I. Denysenko M. Destefanis F. De Mori Y. Ding C. Dong J. Dong L. Y. Dong M. Y. Dong S. X. Du J. Fang S. S. Fang Y. Fang R. Farinelli L. Fava F. Feldbauer G. Felici C. Q. Feng M. Fritsch C. D. Fu Y. Fu X. L. Gao Y. Gao Y. G. Gao I. Garzia E. M. Gersabeck A. Gilman K. Goetzen L. Gong W. X. Gong W. Gradl M. Greco L. M. Gu M. H. Gu S. Gu Y. T. Gu C. Y. Guan A. Q. Guo L. B. Guo R. P. Guo Y. P. Guo A. Guskov S. Han T. T. Han T. Z. Han X. Q. Hao F. A. Harris K. L. He F. H. Heinsius T. Held Y. K. Heng M. Himmelreich T. Holtmann Y. R. Hou Z. L. Hou H. M. Hu J. F. Hu T. Hu Y. Hu G. S. Huang L. Q. Huang X. T. Huang N. Huesken T. Hussain W. Ikegami Andersson W. Imoehl M. Irshad S. Jaeger S. Janchiv Q. Ji Q. P. Ji X. B. Ji X. L. Ji H. B. Jiang X. S. Jiang X. Y. Jiang J. B. Jiao Z. Jiao S. Jin Y. Jin T. Johansson N. Kalantar-Nayestanaki X. S. Kang R. Kappert M. Kavatsyuk B. C. Ke I. K. Keshk A. Khoukaz P. Kiese R. Kiuchi R. Kliemt L. Koch O. B. Kolcu B. Kopf M. Kuemmel M. Kuessner A. Kupsc M. G. Kurth W. Kühn J. J. Lane J. S. Lange P. Larin L. Lavezzi H. Leithoff M. Lellmann T. Lenz C. Li C. H. Li Cheng Li D. M. Li F. Li G. Li H. B. Li H. J. Li J. L. Li J. Q. Li Ke Li L. K. Li Lei Li P. L. Li P. R. Li W. D. Li W. G. Li X. H. Li X. L. Li Z. B. Li Z. Y. Li H. Liang Y. F. Liang Y. T. Liang L. Z. Liao J. Libby C. X. Lin B. Liu B. J. Liu C. X. Liu D. Liu D. Y. Liu F. H. Liu Fang Liu Feng Liu H. B. Liu H. M. Liu Huanhuan Liu Huihui Liu J. B. Liu J. Y. Liu K. Liu K. Y. Liu Ke Liu L. Liu L. Institute of High Energy Physics Beijing 100049 People’s Republic of China G.I. Budker Institute of Nuclear Physics SB RAS (BINP) Novosibirsk 630090 Russia Uppsala University Box 516 SE-75120 Uppsala Sweden Helmholtz Institute Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany Bochum Ruhr-University D-44780 Bochum Germany University of Turin I-10125 Turin Italy INFN I-10125 Turin Italy University of Science and Technology of China Hefei 230026 People’s Republic of China State Key Laboratory of Particle Detection and Electronics Beijing 100049 Hefei 230026 People’s Republic of China Indian Institute of Technology Madras Chennai 600036 India Southeast University Nanjing 211100 People’s Republic of China Joint Institute for Nuclear Research 141980 Dubna Moscow region Russia INFN Laboratori Nazionali di Frascati I-00044 Frascati Italy INFN Sezione di Ferrara I-44122 Ferrara Italy Peking University Beijing 100871 People’s Republic of China Institute of Physics and Technology Peace Avenue 54B Ulaanbaatar 13330 Mongolia Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany University of Muenster Wilhelm-Klemm-Strasse 9 48149 Muenster Germany Wuhan University Wuhan 430072 People’s Republic of China University of Chinese Academy of Sciences Beijing 100049 People’s Republic of China Istanbul Bilgi University 34060 Eyup Istanbul Turkey Central China Normal University Wuhan 430079 People’s Republic of China Nanjing University Nanjing 210093 People’s Republic of China Institute of Modern Physics Lanzhou 730000 People’s Republic of China Nankai University Tianjin 300071 People’s Republic of China Shanghai Jiao Tong University Shanghai 200240 People’s Republic of China Liaoning University Shenyang 110036 People’s Republic of China Zhengzhou University Zhengzhou 450001 People’s Republic of China University of Ferrara I-44122 Ferrara Italy University of Ea

The processes X(3872)→D*0D¯0+c.c.,γJ/ψ,γψ(2S), and γD+D− are searched for in a 9.0 fb−1 data sample collected at center-of-mass energies between 4.178 and 4.278 GeV with the BESIII detector. We observe X(3872)→D*0D0¯+c.c. and find evidence for X(3872)→γJ/ψ with statistical significances of 7.4σ and 3.5σ, respectively. No evident signals for X(3872)→γψ(2S) and γD+D− are found, and the upper limit on the relative branching ratio Rγψ≡{B[X(3872)→γψ(2S)]}/{B[X(3872)→γJ/ψ]}<0.59 is set at 90% confidence level. Measurements of branching ratios relative to decay X(3872)→π+π−J/ψ are also reported for decays X(3872)→D*0D0¯+c.c.,γψ(2S),γJ/ψ, and γD+D−, as well as the non-D*0D0¯ three-body decays π0D0D0¯ and γD0D0¯.

关键词： Quantum chromodynamics Exotic mesons Quarkonia

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