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Measurements of weak decay asymmetries of Λc+→pKs0, Λπ+, Σ+π0, and Σ0π+

Physical Review D 2019年第7期100卷 072004-072004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 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 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 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 Z. L. 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 T. Khan 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 X. Q. 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. 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 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 INFN Sezione di Ferrara I-44122 Ferrara Italy 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 Oxford R

Using e+e−→Λc+Λ¯c− production from a 567 pb−1 data sample collected by BESIII at 4.6 GeV, a full angular analysis is carried out simultaneously on the four decay modes of Λc+→pKS0, Λπ+, Σ+π0, and Σ0π+. For the first time, the Λc+ transverse polarization is studied in unpolarized e+e− collisions, where a nonzero effect is observed with a statistical significance of 2.1σ. The decay asymmetry parameters of the Λc+ weak hadronic decays into pKS0, Λπ+, Σ+π0 and Σ0π+ are measured to be 0.18±0.43(stat)±0.14(syst), −0.80±0.11(stat)±0.02(syst), −0.57±0.10(stat)±0.07(syst), and −0.73±0.17(stat)±0.07(syst), respectively. In comparison with previous results, the measurements for the Λπ+ and Σ+π0 modes are consistent but with improved precision, while the parameters for the pKS0 and Σ0π+ modes are measured for the first time.

关键词： Form factors Hadronic decays Lepton-lepton interactions Polarization in interactions & scattering

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Measurement of the absolute branching fractions of Λc+→Ληπ+ and Σ(1385)+η

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Physical Review D 2019年第3期99卷 032010-032010页

作者： M. Ablikim M. N. Achasov S. Ahmed M. Albrecht M. Alekseev A. Amoroso F. F. An Q. An Y. Bai O. Bakina R. Baldini Ferroli Y. Ban K. Begzsuren D. W. Bennett J. V. Bennett N. Berger M. Bertani D. Bettoni F. Bianchi E. Boger I. Boyko R. A. Briere H. Cai X. Cai A. Calcaterra G. F. Cao S. A. Cetin J. Chai J. F. Chang W. L. Chang G. Chelkov G. Chen H. S. Chen J. C. Chen M. L. Chen S. J. Chen Y. B. Chen W. Cheng G. Cibinetto F. Cossio H. L. Dai J. P. 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 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 Z. Haddadi S. Han X. Q. Hao F. A. Harris K. L. He F. H. Heinsius T. Held Y. K. Heng 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 M. Kavatsyuk B. C. Ke I. K. Keshk T. Khan A. Khoukaz P. Kiese R. Kiuchi R. Kliemt L. Koch O. B. Kolcu B. Kopf M. Kuemmel M. Kuessner A. Kupsc M. Kurth W. Kühn J. S. Lange P. Larin L. Lavezzi H. Leithoff 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. L. Li X. N. Li X. Q. Li Z. B. Li H. Liang Y. F. Liang Y. T. Liang G. R. Liao 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. L. Liu H. M. Liu Huanhuan Liu Huihui Liu J. B. Liu J. Y. Liu K. Y. Liu Ke Liu Q. Liu S. B. Liu X. Liu Y. B. Liu Z. A. Liu Zhiqing Liu Y. F. Long X. C. Lou H. J. Lu J. D. Lu J. G. 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 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 Dubna 141980 Moscow region Russia INFN Laboratori Nazionali di Frascati I-00044 Frascati Italy Peking University Beijing 100871 People’s Republic of China Institute of Physics and Technology Peace Ave. 54B Ulaanbaatar 13330 Mongolia Indiana University Bloomington Indiana 47405 USA Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany INFN Sezione di Ferrara I-44122 Ferrara Italy 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 Nanjing University Nanjing 210093 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 Nankai University Tianjin 300071 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 Central China Normal University Wuhan 430079 People’s Republic of China University of Minnesota Minneapolis Minnesota 55455 USA GSI Helmholtzcentre for Heavy Ion Research GmbH

We study the decays Λc+→Ληπ+ and Σ(1385)+η based on Λc+Λ¯c− pairs produced in e+e− collisions at a center-of-mass energy of s=4.6 GeV, corresponding to an integrated luminosity of 567 pb−1. The data sample was accumulated with the BESIII detector at the BEPCII collider. The branching fractions are measured to be B(Λc+→Ληπ+)=(1.84±0.21(stat)±0.15(syst))% and B(Λc+→Σ(1385)+η)=(0.91±0.18(stat)±0.09(syst))%, constituting the most precise measurements to date.

关键词： Charmed baryons Lepton colliders Particle decays

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Search for a strangeonium-like structure Zs decaying into ϕπ and a measurement of the cross section e+e−→ϕππ

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Physical Review D 2019年第1期99卷 011101(R)-011101(R)页

作者： M. Ablikim M. N. Achasov S. Ahmed M. Albrecht A. Amoroso F. F. An Q. An J. Z. Bai Y. Bai O. Bakina R. Baldini Ferroli Y. Ban D. W. Bennett J. V. Bennett N. Berger M. Bertani D. Bettoni J. M. Bian F. Bianchi E. Boger I. Boyko R. A. Briere H. Cai X. Cai O. Cakir A. Calcaterra G. F. Cao S. A. Cetin J. Chai J. F. Chang G. Chelkov G. Chen H. S. Chen J. C. Chen M. L. Chen P. L. Chen S. J. Chen X. R. Chen Y. B. Chen X. K. Chu G. Cibinetto H. L. Dai J. P. 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 P. F. Duan J. Fang S. S. Fang Y. Fang R. Farinelli L. Fava S. Fegan F. Feldbauer G. Felici C. Q. Feng E. Fioravanti M. Fritsch C. D. Fu Q. Gao X. L. Gao Y. Gao Y. G. Gao Z. Gao I. Garzia K. Goetzen L. Gong W. X. Gong W. Gradl M. Greco M. H. Gu Y. T. Gu A. Q. Guo R. P. Guo Y. P. Guo Z. Haddadi S. Han X. Q. Hao F. A. Harris K. L. He X. Q. He F. H. Heinsius T. Held Y. K. Heng T. Holtmann Z. L. Hou H. M. Hu T. Hu Y. Hu G. S. Huang J. S. Huang X. T. Huang X. Z. Huang Z. L. Huang T. Hussain W. Ikegami Andersson Q. Ji Q. P. Ji X. B. Ji X. L. Ji X. S. Jiang X. Y. Jiang J. B. Jiao Z. Jiao D. P. Jin S. Jin Y. Jin T. Johansson A. Julin N. Kalantar-Nayestanaki X. L. Kang X. S. Kang M. Kavatsyuk B. C. Ke T. Khan A. Khoukaz P. Kiese R. Kliemt L. Koch O. B. Kolcu B. Kopf M. Kornicer M. Kuemmel M. Kuessner M. Kuhlmann A. Kupsc W. Kühn J. S. Lange M. Lara P. Larin L. Lavezzi H. Leithoff C. Leng C. Li Cheng Li D. M. Li F. Li F. Y. Li G. Li H. B. Li H. J. Li J. C. Li Jin Li K. J. Li Kang Li Ke Li Lei Li P. L. Li P. R. Li Q. Y. Li W. D. Li W. G. Li X. L. Li X. N. Li X. Q. Li Z. B. Li H. Liang Y. F. Liang Y. T. Liang G. R. Liao D. X. Lin B. Liu B. J. Liu C. X. Liu D. Liu F. H. Liu Fang Liu Feng Liu H. B. Liu H. M. Liu Huanhuan Liu Huihui Liu J. B. Liu J. P. Liu J. Y. Liu K. Liu K. Y. Liu Ke Liu L. D. Liu P. L. Liu Q. Liu S. B. Liu X. Liu Y. B. Liu Z. A. Liu Zhiqing Liu Y. F. Long X. C. Lou H. J. Lu J. G. Lu Y. Lu Y. P. Lu C. L. Luo M. X. Luo X 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 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 Peking University Beijing 100871 People’s Republic of China Indiana University Bloomington Indiana 47405 USA Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany INFN Sezione di Ferrara I-44122 Ferrara Italy University of Minnesota Minneapolis Minnesota 55455 USA Wuhan University Wuhan 430072 People’s Republic of China Ankara University 06100 Tandogan Ankara Turkey University of Chinese Academy of Sciences Beijing 100049 People’s Republic of China Istanbul Bilgi University 34060 Eyup Istanbul Turkey University of South China Hengyang 421001 People’s Republic of China Nanjing University Nanjing 210093 People’s Republic of China Lanzhou University Lanzhou 730000 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 Nankai University Tianjin 300071 People’s Republic of China Zhengzhou University Zhengzhou 450001 People’s Republic of China University of Ferrara I-44122 Ferrara Italy University of Eastern Piedmont I-15121 Alessandria Italy Tsinghua University Beijing 100084 People’s Republic of China Central China Nor

Using a data sample of e+e− collision data corresponding to an integrated luminosity of 108 pb−1 collected with the BESIII detector at a center-of-mass energy of 2.125 GeV, we study the process e+e−→ϕππ and search for a strangeoniumlike structure Zs decaying into ϕπ. No signal is observed in the ϕπ mass spectrum. Upper limits on the cross sections for Zs production at the 90% confidence level are determined. In addition, the cross sections of e+e−→ϕπ+π− and e+e−→ϕπ0π0 at 2.125 GeV are measured to be (436.2±6.4±30.1) pb and (237.0±8.6±15.4) pb, respectively, where the first uncertainties are statistical and the second systematic.

关键词： Hadronic decays Exotic mesons Hybrid mesons Mesons Lepton colliders

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Observation of the Semileptonic D+ Decay into the K¯1(1270)0 Axial-Vector Meson

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Physical Review Letters 2019年第23期123卷 231801-231801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 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 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 South China Hengyan

By analyzing a 2.93 fb−1 data sample of e+e− collisions, recorded at a center-of-mass energy of 3.773 GeV with the BESIII detector operated at the BEPCII collider, we report the first observation of the semileptonic D+ transition into the axial-vector meson D+→K¯1(1270)0e+νe with a statistical significance greater than 10σ. Its decay branching fraction is determined to be B[D+→K¯1(1270)0e+νe]=(2.30±0.26−0.21+0.18±0.25)×10−3, where the first and second uncertainties are statistical and systematic, respectively, and the third originates from the input branching fraction of K¯1(1270)0→K−π+π0.

关键词： Branching fraction Leptonic, semileptonic & radiative decays Charmed mesons Lepton colliders

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Measurements of e+e−→KS0K±π∓π0 and KS0K±π∓η at center-of-mass energies from 3.90 to 4.60 GeV

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Physical Review D 2019年第1期99卷 012003-012003页

作者： M. Ablikim M. N. Achasov S. Ahmed M. Albrecht M. Alekseev A. Amoroso F. F. An Q. An Y. Bai O. Bakina R. Baldini Ferroli Y. Ban K. Begzsuren D. W. Bennett J. V. Bennett N. Berger M. Bertani D. Bettoni F. Bianchi I. Boyko R. A. Briere H. Cai X. Cai A. Calcaterra G. F. Cao S. A. Cetin J. Chai J. F. Chang W. L. Chang G. Chelkov G. Chen H. S. Chen J. C. Chen M. L. Chen P. L. Chen S. J. Chen Y. B. Chen W. Cheng G. Cibinetto F. Cossio H. L. Dai J. P. 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 P. F. Duan J. Z. Fan J. Fang S. S. Fang Y. Fang R. Farinelli L. Fava S. Fegan 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 A. Gilman K. Goetzen L. Gong W. X. Gong W. Gradl M. Greco L. M. Gu M. H. Gu Y. T. Gu A. Q. Guo L. B. Guo R. P. Guo Y. P. Guo A. Guskov Z. Haddadi S. Han X. Q. Hao F. A. Harris K. L. He F. H. Heinsius T. Held Y. K. Heng 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 Z. L. Huang T. Hussain N. Hsken W. Ikegami Andersson M. Irshad Q. Ji Q. P. Ji X. B. Ji X. L. Ji X. S. Jiang X. Y. Jiang J. B. Jiao Z. Jiao D. P. Jin S. Jin Y. Jin T. Johansson A. Julin N. Kalantar-Nayestanaki X. S. Kang M. Kavatsyuk B. C. Ke I. K. Keshk T. Khan A. Khoukaz P. Kiese R. Kiuchi R. Kliemt L. Koch O. B. Kolcu B. Kopf M. Kornicer M. Kuemmel M. Kuessner A. Kupsc M. Kurth W. Kühn J. S. Lange P. Larin L. Lavezzi S. Leiber H. Leithoff 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 Lei Li P. L. Li P. R. Li Q. Y. Li T. Li W. D. Li W. G. Li X. L. Li X. N. Li X. Q. Li Z. B. Li H. Liang Y. F. Liang Y. T. Liang G. R. Liao 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. L. Liu H. M. Liu Huanhuan Liu Huihui Liu J. B. Liu J. Y. Liu K. Y. Liu Ke Liu Q. Liu S. B. Liu X. Liu Y. B. Liu Z. A. Liu Zhiqing Liu Y. F. Long X. 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 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 Peking University Beijing 100871 People’s Republic of China Institute of Physics and Technology Peace Ave. 54B Ulaanbaatar 13330 Mongolia Indiana University Bloomington Indiana 47405 USA Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany INFN Sezione di Ferrara I-44122 Ferrara Italy 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 University of South China Hengyang 421001 People’s Republic of China Nanjing University Nanjing 210093 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 Nankai University Tianjin 300071 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 Central China Normal University Wuhan 430079 People’s Republic of China University of Minnesota Minnea

Using 5.2 fb−1 e+e− annihilation data samples collected with the BESIII detector, we measure the cross sections of e+e−→KS0K±π∓π0 and KS0K±π∓η at center-of-mass energies from 3.90 to 4.60 GeV. In addition, we search for the charmoniumlike resonance Y(4260) decays into KS0K±π∓π0 and KS0K±π∓η, and Zc0,±(3900) decays into KS0K±π∓,0 and KS0K±η. Corresponding upper limits are provided since no clear signal is observed.

关键词： Hadronic decays Particle production

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Search for baryon and lepton number violation in J/ψ→Λc+e−+c.c.

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Physical Review D 2019年第7期99卷 072006-072006页

作者： M. Ablikim M. N. Achasov S. Ahmed M. Albrecht A. Amoroso F. F. An Q. An J. Z. Bai Y. Bai O. Bakina R. Baldini Ferroli Y. Ban D. W. Bennett J. V. Bennett N. Berger M. Bertani D. Bettoni J. M. Bian F. Bianchi E. Boger I. Boyko R. A. Briere H. Cai X. Cai O. Cakir A. Calcaterra G. F. Cao S. A. Cetin J. Chai J. F. Chang G. Chelkov G. Chen H. S. Chen J. C. Chen M. L. Chen P. L. Chen S. J. Chen X. R. Chen Y. B. Chen X. K. Chu G. Cibinetto H. L. Dai J. P. 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 P. F. Duan J. Fang S. S. Fang X. Fang Y. Fang R. Farinelli L. Fava S. Fegan F. Feldbauer G. Felici C. Q. Feng E. Fioravanti M. Fritsch C. D. Fu Q. Gao X. L. Gao Y. Gao Y. G. Gao Z. Gao I. Garzia K. Goetzen L. Gong W. X. Gong W. Gradl M. Greco M. H. Gu S. Gu Y. T. Gu A. Q. Guo L. B. Guo R. P. Guo Y. P. Guo Z. Haddadi S. Han X. Q. Hao F. A. Harris K. L. He X. Q. He F. H. Heinsius T. Held Y. K. Heng T. Holtmann Z. L. Hou C. Hu H. M. Hu T. Hu Y. Hu G. S. Huang J. S. Huang X. T. Huang X. Z. Huang Z. L. Huang T. Hussain W. Ikegami Andersson Q. Ji Q. P. Ji X. B. Ji X. L. Ji X. S. Jiang X. Y. Jiang J. B. Jiao Z. Jiao D. P. Jin S. Jin Y. Jin T. Johansson A. Julin N. Kalantar-Nayestanaki X. L. Kang X. S. Kang M. Kavatsyuk B. C. Ke T. Khan A. Khoukaz P. Kiese R. Kliemt L. Koch O. B. Kolcu B. Kopf M. Kornicer M. Kuemmel M. Kuessner M. Kuhlmann A. Kupsc W. Kühn J. S. Lange M. Lara P. Larin L. Lavezzi S. Leiber H. Leithoff C. Leng C. Li Cheng Li D. M. Li F. Li F. Y. Li G. Li H. B. Li H. J. Li J. C. Li J. Q. Li K. J. Li Kang Li Ke Li Lei Li P. L. Li P. R. Li Q. Y. Li T. Li W. D. Li W. G. Li X. L. Li X. N. Li X. Q. Li Z. B. Li H. Liang Y. F. Liang Y. T. Liang G. R. Liao D. X. Lin B. Liu B. J. Liu C. X. Liu D. Liu F. H. Liu Fang Liu Feng Liu H. B. Liu H. M. Liu Huanhuan Liu Huihui Liu J. B. Liu J. P. Liu J. Y. Liu K. Liu K. Y. Liu Ke Liu L. D. Liu P. L. Liu Q. Liu S. B. Liu X. Liu Y. B. Liu Z. A. Liu Zhiqing Liu Y. F. Long X. C. Lou H. J. 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 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 State Key Laboratory of Particle Detection and Electronics Beijing 100049 Hefei 230026 People’s Republic of China University of Science and Technology of China 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 Peking University Beijing 100871 People’s Republic of China Indiana University Bloomington Indiana 47405 USA Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany INFN Sezione di Ferrara I-44122 Ferrara Italy University of Minnesota Minneapolis Minnesota 55455 USA Wuhan University Wuhan 430072 People’s Republic of China Ankara University 06100 Tandogan Ankara Turkey University of Chinese Academy of Sciences Beijing 100049 People’s Republic of China Istanbul Bilgi University 34060 Eyup Istanbul Turkey University of South China Hengyang 421001 People’s Republic of China Nanjing University Nanjing 210093 People’s Republic of China Lanzhou University Lanzhou 730000 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 Nankai University Tianjin 300071 People’s Republic of China Zhengzhou University Zhengzhou 450001 People’s Republic of China University of Ferrara I-44122 Ferrara Italy University of Eastern Piedmont I-15121 Alessandria Italy Tsinghua University Beijing 100084 People’s Republic of China Central China

Using 1.31×109 J/ψ events collected by the BESIII detector at the Beijing Electron Positron Collider, we search for the process J/ψ→Λc+e−+c.c. for the first time. In this process, both baryon and lepton number conservation is violated. No signal is found and the upper limit on the branching fraction B(J/ψ→Λc+e−+c.c.) is set to be 6.9×10−8 at the 90% confidence level.

关键词： Leptonic, semileptonic & radiative decays Quarkonia Baryon & lepton number symmetries Lepton colliders

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Study of e+e−→γωJ/ψ and Observation of X(3872)→ωJ/ψ

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Physical Review Letters 2019年第23期122卷 232002-232002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 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 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 T. Khan 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 X. Q. Li Z. B. 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. Liu K. Y. Liu Ke 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 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 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 INFN Sezione di Ferrara I-44122 Ferrara Italy 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 South China Hengyang

We study the e+e−→γωJ/ψ process using 11.6 fb−1 e+e− annihilation data taken at center-of-mass energies from s=4.008 GeV to 4.600 GeV with the BESIII detector at the BEPCII storage ring. The X(3872) resonance is observed for the first time in the ωJ/ψ system with a significance of more than 5σ. The relative decay ratio of X(3872)→ωJ/ψ and π+π−J/ψ is measured to be R=1.6−0.3+0.4±0.2, where the first uncertainty is statistical and the second systematic (the same hereafter). The s-dependent cross section of e+e−→γX(3872) is also measured and investigated, and it can be described by a single Breit-Wigner resonance, referred to as the Y(4200), with a mass of 4200.6−13.3+7.9±3.0 MeV/c2 and a width of 115−26+38±12 MeV. In addition, to describe the ωJ/ψ mass distribution above 3.9 GeV/c2, we need at least one additional Breit-Wigner resonance, labeled as X(3915), in the fit. The mass and width of the X(3915) are determined. The resonant parameters of the X(3915) agree with those of the Y(3940) in B→KωJ/ψ and of the X(3915) in γγ→ωJ/ψ observed by the Belle and BABAR experiments within errors.

关键词： Branching fraction Hadronic decays Exotic mesons Heavy mesons Quarkonia

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Complete Measurement of the Λ Electromagnetic Form Factors

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Physical Review Letters 2019年第12期123卷 122003-122003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 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 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 T. Khan 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 X. Q. 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. Liu K. Y. 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 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 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 INFN Sezione di Ferrara I-44122 Ferrara Italy 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 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

The exclusive process e+e−→ΛΛ¯, with Λ→pπ− and Λ¯→p¯π+, has been studied at s=2.396 GeV for measurement of the timelike Λ electric and magnetic form factors, GE and GM. A data sample, corresponding to an integrated luminosity of 66.9 pb−1, was collected with the BESIII detector for this purpose. A multidimensional analysis with a complete decomposition of the spin structure of the reaction enables a determination of the modulus of the ratio R=|GE/GM| and, for the first time for any baryon, the relative phase ΔΦ=ΦE−ΦM. The resulting values are R=0.96±0.14(stat)±0.02(syst) and ΔΦ=37°±12°(stat)±6°(syst), respectively. These are obtained using the recently established and most precise value of the asymmetry parameter αΛ=0.750±0.010 measured by BESIII. In addition, the cross section is measured with unprecedented precision to be σ=118.7±5.3(stat)±5.1(syst) pb, which corresponds to an effective form factor of |G|=0.123±0.003(stat)±0.003(syst). The contribution from two-photon exchange is found to be negligible. Our result enables the first complete determination of baryon timelike electromagnetic form factors.

关键词： Form factors Particle interactions Polarization phenomena Quark model

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Observation of the Leptonic Decay D+→τ+ντ

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Physical Review Letters 2019年第21期123卷 211802-211802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 South China Hengyang

We report the first observation of D+→τ+ντ with a significance of 5.1σ. We measure B(D+→τ+ντ)=(1.20±0.24stat±0.12syst)×10−3. Taking the world average B(D+→μ+νμ)=(3.74±0.17)×10−4, we obtain Rτ/μ=Γ(D+→τ+ντ)/Γ(D+→μ+νμ)=3.21±0.64stat±0.43syst., which is consistent with the standard model expectation of lepton flavor universality. Using external inputs, our results give values for the D+ decay constant fD+ and the Cabibbo-Kobayashi-Maskawa matrix element |Vcd| that are consistent with, but less precise than, other determinations.

关键词： Form factors Particle interactions

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Search for the decay η′→γγη

引用

Physical Review D 2019年第5期100卷 052015-052015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 Oxford Roa

Using a data sample of 1.31×109 J/ψ events collected with the BESIII detector, a search for η′→γγη via J/ψ→γη′ is performed for the first time. No significant η′ signal is observed in the γγη invariant mass spectrum, and the branching fraction of η′→γγη is determined to be less than 1.33×10−4 at the 90% confidence level.

关键词： Branching fraction Hadronic decays Rare decays

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