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Physical Review D 2023年第9期107卷 L091101-L091101页

作者： M. Ablikim M. N. Achasov P. Adlarson S. Ahmed M. Albrecht R. Aliberti A. Amoroso M. R. An Q. An X. H. Bai Y. Bai O. Bakina R. Baldini Ferroli I. Balossino Y. Ban V. Batozskaya D. Becker K. Begzsuren N. Berger M. Bertani D. Bettoni F. Bianchi J. Bloms A. Bortone I. Boyko R. A. Briere A. Brueggemann H. Cai X. Cai A. Calcaterra G. F. Cao N. Cao S. A. Cetin J. F. Chang W. L. Chang G. Chelkov C. Chen G. Chen H. S. Chen M. L. Chen S. J. Chen T. Chen X. R. Chen X. T. Chen Y. B. Chen Z. J. Chen W. S. Cheng G. Cibinetto F. Cossio J. J. Cui H. L. Dai J. P. Dai A. Dbeyssi R. E. de Boer D. Dedovich Z. Y. Deng A. Denig I. Denysenko M. Destefanis F. De Mori Y. Ding J. Dong L. Y. Dong M. Y. Dong X. Dong S. X. Du P. Egorov Y. L. Fan J. Fang S. S. Fang Y. Fang R. Farinelli L. Fava F. Feldbauer G. Felici C. Q. Feng J. H. Feng K. Fischer M. Fritsch C. D. Fu H. Gao Y. N. Gao Yang Gao I. Garzia P. T. Ge Z. W. Ge C. Geng E. M. Gersabeck A. Gilman K. Goetzen L. Gong W. X. Gong W. Gradl M. Greco L. M. Gu M. H. Gu Y. T. Gu C. Y. Guan A. Q. Guo L. B. Guo R. P. Guo Y. P. Guo A. Guskov T. T. Han W. Y. Han X. Q. Hao F. A. Harris K. K. He K. L. He F. H. Heinsius C. H. Heinz Y. K. Heng C. Herold M. Himmelreich T. Holtmann G. Y. Hou Y. R. Hou Z. L. Hou H. M. Hu J. F. Hu T. Hu Y. Hu G. S. Huang K. X. Huang L. Q. Huang X. T. Huang Y. P. Huang Z. Huang T. Hussain N. Hüsken W. Imoehl M. Irshad J. Jackson S. Jaeger S. Janchiv Q. Ji Q. P. Ji X. B. Ji X. L. Ji Y. Y. Ji H. B. Jiang S. S. Jiang X. S. Jiang Y. Jiang J. B. Jiao Z. Jiao S. Jin Y. Jin M. Q. Jing T. Johansson N. Kalantar-Nayestanaki X. S. Kang R. Kappert M. Kavatsyuk B. C. Ke I. K. Keshk A. Khoukaz P. Kiese R. Kiuchi R. Kliemt L. Koch O. B. Kolcu B. Kopf M. Kuemmel M. Kuessner A. Kupsc W. Kühn J. J. Lane J. S. Lange P. Larin A. Lavania L. Lavezzi Z. H. Lei H. Leithoff M. Lellmann T. Lenz C. Li C. H. Li Cheng Li D. M. Li F. Li G. Li H. Li H. B. Li H. J. Li H. N. Li J. Q. Li J. S. Li J. W. Li Ke Li L. J. Li L. K. Li Lei Li M. H. Li P. R. Li S. X. Li S. Y. Li T. Li W. D. Li W. G. Li X. H. Li X. 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 Staudinger Weg 18 D-55099 Mainz Germany Bochum Ruhr-University D-44780 Bochum Germany Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany University of Turin and INFN University of Turin I-10125 Turin Italy INFN I-10125 Turin Italy Liaoning Normal University Dalian 116029 People’s Republic of China 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 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 National Centre for Nuclear Research Warsaw 02-093 Poland Institute of Physics and Technology Peace Avenue 54B Ulaanbaatar 13330 Mongolia University of Muenster Wilhelm-Klemm-Strasse 9 48149 Muenster Germany Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA Wuhan University Wuhan 430072 People’s Republic of China University of Chinese Academy of Sciences Beijing 100049 People’s Republic of China Turkish Accelerator Center Particle Factory Group Istinye University 34010 Istanbul Turkey Nankai University Tianjin 300071 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 Shandong University Jinan 250100 People’s Republic of China Yunnan University Kunming 6505

Using a data sample collected with the BESIII detector operating at the BEPCII storage ring, the Born cross section of the process e+e−→ηJ/ψ at a center-of-mass energy s=3.773 GeV is measured to be (8.88±0.87±0.42) pb. We fit the cross section line shape before correcting for the initial state radiation from s=3.773 to 4.600 GeV to obtain the branching fraction B(ψ(3770)→ηJ/ψ). We obtain B(ψ(3770)→ηJ/ψ)=(11.3±5.9±1.1)×10−4 when the ψ(3770) decay amplitude is added coherently to the other contributions, and (8.7±1.0±0.8)×10−4 when it is added incoherently. Here the quoted uncertainties are statistical and systematic, respectively. In both cases, the statistical significance of ψ(3770) resonance is above 7σ. This is the first time the decay ψ(3770)→ηJ/ψ is observed with a statistical significance greater than 5σ.

关键词： Particle interactions Particle production Quarkonia Lepton colliders

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Study of light scalar mesons through Ds+→π0π0e+νe and KS0KS0e+νe decays

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Physical Review D 2022年第3期105卷 L031101-L031101页

作者： M. Ablikim M. N. Achasov P. Adlarson S. Ahmed M. Albrecht R. Aliberti A. Amoroso M. R. An Q. An X. H. Bai Y. Bai O. Bakina R. Baldini Ferroli I. Balossino Y. Ban K. Begzsuren N. Berger M. Bertani D. Bettoni F. Bianchi 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 X. C. Dai A. Dbeyssi R. E. 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 X. Dong S. X. Du Y. L. Fan J. Fang S. S. Fang Y. Fang R. Farinelli L. Fava F. Feldbauer G. Felici C. Q. Feng J. H. Feng M. Fritsch C. D. Fu Y. Gao Y. G. Gao I. Garzia P. T. Ge C. Geng E. M. Gersabeck A. Gilman K. Goetzen L. Gong W. X. Gong W. Gradl M. Greco L. M. Gu M. H. Gu C. Y. Guan A. Q. Guo L. B. Guo R. P. Guo Y. P. Guo A. Guskov T. T. Han W. Y. Han X. Q. Hao F. A. Harris K. L. He F. H. Heinsius C. H. Heinz Y. K. Heng C. Herold M. Himmelreich T. Holtmann G. Y. Hou 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 T. Hussain N. Hüsken W. Ikegami Andersson W. Imoehl M. Irshad S. Jaeger S. Janchiv Q. Ji Q. P. Ji X. B. Ji X. L. Ji Y. Y. Ji H. B. Jiang X. S. Jiang J. B. Jiao Z. Jiao S. Jin Y. Jin M. Q. Jing T. Johansson N. Kalantar-Nayestanaki X. S. Kang R. Kappert M. Kavatsyuk B. C. Ke I. K. Keshk A. Khoukaz 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 A. Lavania L. Lavezzi Z. H. Lei H. Leithoff M. Lellmann T. Lenz C. Li C. H. Li Cheng Li D. M. Li F. Li G. Li H. Li H. B. Li H. J. Li H. N. Li J. L. Li J. Q. Li J. S. Li Ke Li L. K. Li Lei Li P. R. Li S. Y. Li W. D. Li W. G. Li X. H. Li X. L. Li Xiaoyu 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 T. Lin B. J. Liu C. X. Liu D. Liu F. H 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 Staudinger Weg 18 D-55099 Mainz Germany Bochum Ruhr-University D-44780 Bochum Germany Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany University of Turin I-10125 Turin Italy INFN I-10125 Turin Italy Liaoning Normal University Dalian 116029 People’s Republic of China 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 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 University of Muenster Wilhelm-Klemm-Street 9 48149 Muenster Germany Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA Wuhan University Wuhan 430072 People’s Republic of China University of Chinese Academy of Sciences Beijing 100049 People’s Republic of China Turkish Accelerator Center Particle Factory Group Istanbul Bilgi University HEP Res. Cent. 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 Liaoning University Shenyang 110036 People’s Republic of China Zhengzhou University

Using 6.32 fb−1 of e+e− collision data recorded by the BESIII detector at center-of-mass energies between 4.178 to 4.226 GeV, we present the first measurement of the decay Ds+→f0(980)e+νe,f0(980)→π0π0. The product branching fraction of Ds+→f0(980)e+νe,f0(980)→π0π0 is measured to be (7.9±1.4stat±0.4syst)×10−4, with a statistical significance of 7.8σ. Furthermore, the upper limits on the product branching fractions of Ds+→f0(500)e+νe with f0(500)→π0π0 and the branching fraction of Ds+→KS0KS0e+νe are set to be 7.3×10−4 and 3.8×10−4 at 90% confidence level, respectively. Our results provide valuable inputs to the understanding of the structures of light scalar mesons.

关键词： Branching fraction Leptonic, semileptonic & radiative decays Particle mixing & oscillations Charmed mesons Quark model Lepton colliders

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Measurement of the cross section for e+e−→ΛΛ¯ and evidence of the decay ψ(3770)→ΛΛ¯

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Physical Review D 2021年第9期104卷 L091104-L091104页

作者： M. Ablikim M. N. Achasov P. Adlarson S. Ahmed M. Albrecht R. Aliberti A. Amoroso M. R. An Q. An X. H. Bai Y. Bai O. Bakina R. Baldini Ferroli I. Balossino Y. Ban K. Begzsuren N. Berger M. Bertani D. Bettoni F. Bianchi 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. E. 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 X. Dong S. X. Du Y. L. Fan J. Fang S. S. Fang Y. Fang R. Farinelli L. Fava F. Feldbauer G. Felici C. Q. Feng J. H. Feng M. Fritsch C. D. Fu Y. Gao Y. G. Gao I. Garzia P. T. Ge C. Geng E. M. Gersabeck A. Gilman K. Goetzen L. Gong W. X. Gong W. Gradl M. Greco L. M. Gu M. H. Gu Y. T. Gu C. Y. Guan A. Q. Guo L. B. Guo R. P. Guo Y. P. Guo A. Guskov T. T. Han W. Y. Han X. Q. Hao F. A. Harris K. L. He F. H. Heinsius C. H. Heinz Y. K. Heng C. Herold M. Himmelreich T. Holtmann G. Y. Hou 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 T. Hussain N. Hüsken W. Ikegami Andersson W. Imoehl M. Irshad S. Jaeger S. Janchiv Q. Ji Q. P. Ji X. B. Ji X. L. Ji Y. Y. Ji H. B. Jiang X. S. Jiang J. B. Jiao Z. Jiao S. Jin Y. Jin M. Q. Jing T. Johansson N. Kalantar-Nayestanaki X. S. Kang R. Kappert M. Kavatsyuk B. C. Ke I. K. Keshk A. Khoukaz 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 A. Lavania L. Lavezzi Z. H. Lei H. Leithoff M. Lellmann T. Lenz C. Li C. H. Li Cheng Li D. M. Li F. Li G. Li H. Li H. B. Li H. J. Li J. L. Li J. Q. Li J. S. Li Ke Li L. K. Li Lei Li P. R. Li S. Y. Li W. D. Li W. G. Li X. H. Li X. L. Li Xiaoyu Li Z. Y. Li H. Liang Y. F. Liang Y. T. Liang G. R. Liao L. Z. Liao J. Libby C. X. Lin B. J. Liu C. X. Liu D. Liu F. H. Liu F 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 Staudinger Weg 18 D-55099 Mainz Germany Bochum Ruhr-University D-44780 Bochum Germany Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany University of Turin I-10125 Turin Italy INFN I-10125 Turin Italy Liaoning Normal University Dalian 116029 People’s Republic of China 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 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 University of Muenster Wilhelm-Klemm-Straße 9 48149 Muenster Germany Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA Wuhan University Wuhan 430072 People’s Republic of China University of Chinese Academy of Sciences Beijing 100049 People’s Republic of China Turkish Accelerator Center Particle Factory Group Istinye University 34010 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 11003

The Born cross section of the process e+e−→ΛΛ¯ is measured at 33 center-of-mass energies between 3.51 and 4.60 GeV using data corresponding to the total integrated luminosity of 20.0 fb−1 collected with the BESIII detector at the BEPCII collider. Describing the energy dependence of the cross section requires a contribution from the ψ(3770)→ΛΛ¯ decay, which is fitted with a significance of 4.6−4.9σ including the systematic uncertainty. The lower bound on its branching fraction is 2.4×10−6 at the 90% confidence level (C.L.), at least an order of magnitude larger than expected from predictions using a scaling based on observed electronic widths. This result indicates the importance of effects from vector charmonium(like) states when interpreting data in terms of e.g., electromagnetic structure observables. The data do not allow for definite conclusions on the interplay with other vector charmonium(like) states, and we set 90% C.L. upper limits for the products of their electronic widths and the branching fractions.

关键词： Particle interactions Baryons

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Study of the decay Ds+→π+π+π−η and observation of the W-annihilation decay Ds+→a0(980)+ρ0

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Physical Review D 2021年第7期104卷 L071101-L071101页

作者： M. Ablikim M. N. Achasov P. Adlarson S. Ahmed M. Albrecht R. Aliberti A. Amoroso M. R. An Q. An X. H. Bai Y. Bai O. Bakina R. Baldini Ferroli I. Balossino Y. Ban K. Begzsuren N. Berger M. Bertani D. Bettoni F. Bianchi 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 X. C. Dai A. Dbeyssi R. E. 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 X. Dong S. X. Du Y. L. Fan J. Fang S. S. Fang Y. Fang R. Farinelli L. Fava F. Feldbauer G. Felici C. Q. Feng J. H. Feng M. Fritsch C. D. Fu Y. Gao Y. G. Gao I. Garzia P. T. Ge C. Geng E. M. Gersabeck A. Gilman K. Goetzen L. Gong W. X. Gong W. Gradl M. Greco L. M. Gu M. H. Gu S. Gu Y. T. Gu C. Y. Guan A. Q. Guo L. B. Guo R. P. Guo Y. P. Guo A. Guskov T. T. Han W. Y. Han X. Q. Hao F. A. Harris N. Hüsken K. L. He F. H. Heinsius C. H. Heinz T. Held Y. K. Heng C. Herold 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 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 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 A. Lavania L. Lavezzi Z. H. Lei H. Leithoff M. Lellmann T. Lenz C. Li C. H. Li Cheng Li D. M. Li F. Li G. Li H. Li H. B. Li H. J. Li J. L. Li J. Q. Li J. S. Li Ke Li L. K. Li Lei Li P. R. Li S. Y. Li W. D. Li W. G. Li X. H. Li X. L. Li Z. Y. Li H. Liang Y. F. Liang Y. T. Liang L. Z. Liao J. Libby C. X. Lin B. J. Liu C. X. Liu D. Liu F. H. Liu Fang Liu Feng Liu H. B. Liu H. M. Liu Huanhuan 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 Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany University of Turin and INFN University of Turin I-10125 Turin Italy INFN I-10125 Turin Italy Liaoning Normal University Dalian 116029 People’s Republic of China 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 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 University of Muenster Wilhelm-Klemm-Street 9 48149 Muenster Germany Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA Wuhan University Wuhan 430072 People’s Republic of China University of Chinese Academy of Sciences Beijing 100049 People’s Republic of China Turkish Accelerator Center Particle Factory Group 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 Liaoning University Shenyang 110036 People’s Republic of Ch

The decay Ds+→π+π+π−η is observed for the first time, using e+e− collision data corresponding to an integrated luminosity of 6.32 fb−1, collected by the BESIII detector at center-of-mass energies between 4.178 and 4.226 GeV. The absolute branching fraction for this decay is measured to be B(Ds+→π+π+π−η)=(3.12±0.13stat±0.09syst)%. The first amplitude analysis of this decay reveals the substructures in Ds+→π+π+π−η and determines the relative fractions and the phases among these substructures. The dominant intermediate process is Ds+→a1(1260)+η,a1(1260)+→ρ(770)0π+ with a branching fraction of (1.73±0.14stat±0.08syst)%. We also observe the W-annihilation process Ds+→a0(980)+ρ(770)0, a0(980)+→π+η with a branching fraction of (0.21±0.08stat±0.05syst)%, which is larger than the branching fractions of other measured pure W-annihilation decays by 1 order of magnitude.

关键词： Particle data analysis Particle decays Particle interactions Precision measurements

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Search for the decay D0→π0νν¯

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Physical Review D 2022年第7期105卷 L071102-L071102页

作者： M. Ablikim M. N. Achasov P. Adlarson S. Ahmed M. Albrecht R. Aliberti A. Amoroso M. R. An Q. An X. H. Bai Y. Bai O. Bakina R. Baldini Ferroli I. Balossino Y. Ban K. Begzsuren N. Berger M. Bertani D. Bettoni F. Bianchi J. Bloms A. Bortone I. Boyko R. A. Briere A. Brueggemann H. Cai X. Cai A. Calcaterra G. F. Cao N. Cao S. A. Cetin J. F. Chang W. L. Chang G. Chelkov 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 H. L. Dai X. C. Dai A. Dbeyssi R. E. de Boer D. Dedovich Z. Y. Deng A. Denig I. Denysenko M. Destefanis F. De Mori Y. Ding J. Dong L. Y. Dong M. Y. Dong X. Dong S. X. Du Y. L. Fan J. Fang S. S. Fang Y. Fang R. Farinelli L. Fava F. Feldbauer G. Felici C. Q. Feng J. H. Feng M. Fritsch C. D. Fu Y. N. Gao Ya Gao Yang Gao I. Garzia P. T. Ge C. Geng E. M. Gersabeck A. Gilman K. Goetzen L. Gong W. X. Gong W. Gradl M. Greco L. M. Gu M. H. Gu C. Y. Guan L. B. Guo R. P. Guo Y. P. Guo A. Guskov T. T. Han W. Y. Han X. Q. Hao F. A. Harris K. L. He F. H. Heinsius C. H. Heinz Y. K. Heng C. Herold M. Himmelreich T. Holtmann G. Y. Hou 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 T. Hussain N. Hüsken W. Imoehl M. Irshad J. Jackson S. Jaeger S. Janchiv Q. Ji Q. P. Ji X. B. Ji X. L. Ji Y. Y. Ji H. B. Jiang X. S. Jiang Y. Jiang J. B. Jiao Z. Jiao S. Jin Y. Jin M. Q. Jing T. Johansson N. Kalantar-Nayestanaki X. S. Kang R. Kappert M. Kavatsyuk B. C. Ke I. K. Keshk A. Khoukaz 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 A. Lavania L. Lavezzi Z. H. Lei H. Leithoff M. Lellmann T. Lenz C. Li C. H. Li Cheng Li D. M. Li F. Li G. Li H. Li H. B. Li H. J. Li J. Q. Li J. S. Li J. W. Li Ke Li L. K. Li Lei Li P. R. Li S. Y. Li W. D. Li W. G. Li X. H. Li X. L. Li Xiaoyu Li Z. Y. Li H. Liang Y. F. Liang Y. T. Liang G. R. Liao L. Z. Liao J. Libby A. Limphirat C. X. Lin T. Lin B. J. Liu C. X. Liu D. Liu F. H. Liu Fang Liu Feng Li 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 Staudinger Weg 18 D-55099 Mainz Germany Bochum Ruhr-University D-44780 Bochum Germany Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany University of Turin and INFN University of Turin I-10125 Turin Italy University of Turin and INFN INFN I-10125 Turin Italy Liaoning Normal University Dalian 116029 People’s Republic of China 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 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 Russia INFN Laboratori Nazionali di Frascati INFN Laboratori Nazionali di Frascati I-00044 Frascati Italy INFN Sezione di Ferrara 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 University of Muenster Wilhelm-Klemm-Str. 9 48149 Muenster Germany Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA Wuhan University Wuhan 430072 People’s Republic of China University of Chinese Academy of Sciences Beijing 100049 People’s Republic of China Turkish Accelerator Center Particle Factory Group Istinye University 34010 Istanbul Turkey 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 Liaoning University Shenyang 110036 People’s Republic of China Zhengzhou University Zhengzhou 450001 People’s Republic of China Univ

We present the first experimental search for the rare charm decay D0→π0νν¯. It is based on an e+e− collision sample consisting of 10.6×106 pairs of D0D¯0 mesons collected by the BESIII detector at s=3.773 GeV, corresponding to an integrated luminosity of 2.93 fb−1. A data-driven method is used to ensure the reliability of the background modeling. No significant D0→π0νν¯ signal is observed in data and an upper limit of the branching fraction is set to be 2.1×10−4 at the 90% confidence level. This is the first experimental constraint on charmed-hadron decays into dineutrino final states.

关键词： Electroweak interaction Flavor changing neutral currents Rare decays Charmed mesons Neutrinos Lepton colliders

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Measurement of e+e− → π+π−ψ(3686) from 4.008 to 4.600 GeV and observation of a charged structure in the π±ψ(3686) mass spectrum

arXiv

引用

arXiv 2017年

作者： Ablikim, M. Achasov, M.N. Ahmed, S. Ai, X.C. Albayrak, O. Albrecht, M. Ambrose, D.J. Amoroso, A. An, F.F. An, Q. Bai, J.Z. Bakina, O. Baldini Ferroli, R. Ban, Y. Bennett, D.W. Bennett, J.V. Berger, N. Bertani, M. Bettoni, D. Bian, J.M. Bianchi, F. Boger, E. Boyko, I. Briere, R.A. Cai, H. Cai, X. Cakir, O. Calcaterra, A. Cao, G.F. Cetin, S.A. Chai, J. Chang, J.F. Chelkov, G. Chen, G. Chen, H.S. Chen, J.C. Chen, M.L. Chen, S. Chen, S.J. Chen, X. Chen, X.R. Chen, Y.B. Chu, X.K. Cibinetto, G. Dai, H.L. Dai, J.P. Dbeyssi, A. Dedovich, D. Deng, Z.Y. Denig, A. Denysenko, I. Destefanis, M. de Mori, F. Ding, Y. Dong, C. Dong, J. Dong, L.Y. Dong, M.Y. Dou, Z.L. Du, S.X. Duan, P.F. Fan, J.Z. Fang, J. Fang, S.S. Fang, X. Fang, Y. Farinelli, R. Fava, L. Feldbauer, F. Felici, G. Feng, C.Q. Fioravanti, E. Fritsch, M. Fu, C.D. Gao, Q. Gao, X.L. Gao, Y. Gao, Z. Garzia, I. Goetzen, K. Gong, L. Gong, W.X. Gradl, W. Greco, M. Gu, M.H. Gu, Y.T. Guan, Y.H. Guo, A.Q. Guo, L.B. Guo, R.P. Guo, Y. Guo, Y.P. Haddadi, Z. Hafner, A. Han, S. Hao, X.Q. Harris, F.A. He, K.L. Heinsius, F.H. Held, T. Heng, Y.K. Holtmann, T. Hou, Z.L. Hu, C. Hu, H.M. Hu, T. Hu, Y. Huang, G.S. Huang, J.S. Huang, X.T. Huang, X.Z. Huang, Z.L. Hussain, T. Ikegami Andersson, W. Ji, Q. Ji, Q.P. Ji, X.B. Ji, X.L. Jiang, L.W. Jiang, X.S. Jiang, X.Y. Jiao, J.B. Jiao, Z. Jin, D.P. Jin, S. Johansson, T. Julin, A. Kalantar-Nayestanaki, N. Kang, X.L. Kang, X.S. Kavatsyuk, M. Ke, B.C. Kiese, P. Kliemt, R. Kloss, B. Kolcu, O.B. Kopf, B. Kornicer, M. Kupsc, A. Kühn, W. Lange, J.S. Lara, M. Larin, P. Leithoff, H. Leng, C. Li, 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. Li, K. Li, Lei Li, P.R. Li, Q.Y. Li, T. Li, W.D. Li, W.G. Li, X.L. Li, X.N. Li, X.Q. Li, Y.B. 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 Institute of Information Technology Lahore Defence Road Off Raiwind Road Lahore54000 Pakistan 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 Johann-Joachim-Becher-Weg 45 MainzD-55099 Germany Henan Normal University Xinxiang453007 China Henan University of Science and Technology Luoyang471003 China Huangshan College Huangshan245000 China Hunan University Changsha410082 China Indiana University BloomingtonIN47405 United States INFN Laboratori Nazionali di Frascati FrascatiI-00044 Italy INFN and University of Perugia PerugiaI-06100 Italy INFN Sezione di Ferrara FerraraI-44122 Italy University of Ferrara FerraraI-44122 Italy 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 KVI-CART University of Groningen GroningenNL-9747 AA Netherlands Lanzhou University Lanzhou730000 China Liaoning University Shenyang110036 China Nanjing Normal University Nanjing210023 China Nanjing University Nanjing210093 China Nankai University Tianjin300071 China Peking University Beijing100871 China Seoul National University Seoul151-747 Korea Republic of Shandong University Jinan250100 China Shanghai Jiao Tong University Shang

We study the process e+e− → π+π−ψ(3686) using 5.1 fb−1 of data collected at 16 center-of-mass energy (√s) points from 4.008 to 4.600 GeV by the BESIII detector operating at the BEPCII collider. The measured Born cross sections for e+e− → π+π−ψ(3686) are consistent with previous results, but with much improved precision. A fit to the cross section shows contributions from two structures: the first has M = 4209.5 ± 7.4 ± 1.4 MeV/c2 and Γ = 80.1 ± 24.6 ± 2.9 MeV, and the second has M = 4383.8±4.2±0.8 MeV/c2 and Γ = 84.2±12.5±2.1 MeV, where the first errors are statistical and the second systematic. The lower-mass resonance is observed in the process e+e− → π+π−ψ(3686) for the first time with a statistical significance of 5.8σ. A charged charmonium-like structure is observed in the π±ψ(3686) invariant mass spectrum for data at √s = 4.416 GeV. A fit with an S-wave Breit-Wigner function yields a mass M = 4032.1±2.4 MeV/c2, where the errors are statistical only. However, there are still unresolved discrepancies between the fit model and data. The width of the intermediate state varies in a wide range for different kinematic regions within the data set. Therefore no simple interpretation of the data has been found, and a future data sample with larger statistics and more theoretical input will be required to better understand this issue. Copyright © 2017, The Authors. All rights reserved.

关键词： Germanium alloys

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Evidence of the singly Cabibbo suppressed decay Λc+→pπ0

引用

Physical Review D 2024年第9期109卷 L091101-L091101页

作者： M. Ablikim M. N. Achasov P. Adlarson X. C. Ai R. Aliberti A. Amoroso M. R. An Q. An Y. Bai O. Bakina I. Balossino Y. Ban V. Batozskaya K. Begzsuren N. Berger M. Berlowski M. Bertani D. Bettoni F. Bianchi E. Bianco A. Bortone I. Boyko R. A. Briere A. Brueggemann H. Cai X. Cai A. Calcaterra G. F. Cao N. Cao S. A. Cetin J. F. Chang T. T. Chang W. L. Chang G. R. Che G. Chelkov C. Chen Chao Chen G. Chen H. S. Chen M. L. Chen S. J. Chen S. M. Chen T. Chen X. R. Chen X. T. Chen Y. B. Chen Y. Q. Chen Z. J. Chen W. S. Cheng S. K. Choi X. Chu G. Cibinetto S. C. Coen F. Cossio J. J. Cui H. L. Dai J. P. Dai A. Dbeyssi R. E. de Boer D. Dedovich Z. Y. Deng A. Denig I. Denysenko M. Destefanis F. De Mori B. Ding X. X. Ding Y. Ding J. Dong L. Y. Dong M. Y. Dong X. Dong M. C. Du S. X. Du Z. H. Duan P. Egorov Y. H. Y. Fan Y. L. Fan J. Fang S. S. Fang W. X. Fang Y. Fang R. Farinelli L. Fava F. Feldbauer G. Felici C. Q. Feng J. H. Feng K. Fischer M. Fritsch C. Fritzsch C. D. Fu J. L. Fu Y. W. Fu H. Gao Y. N. Gao Yang Gao S. Garbolino I. Garzia P. T. Ge Z. W. Ge C. Geng E. M. Gersabeck A. Gilman K. Goetzen L. Gong W. X. Gong W. Gradl S. Gramigna M. Greco M. H. Gu C. Y. Guan Z. L. Guan A. Q. Guo L. B. Guo M. J. Guo R. P. Guo Y. P. Guo A. Guskov T. T. Han W. Y. Han X. Q. Hao F. A. Harris K. K. He K. L. He F. H. H. Heinsius C. H. Heinz Y. K. Heng C. Herold T. Holtmann P. C. Hong G. Y. Hou X. T. Hou Y. R. Hou Z. L. Hou H. M. Hu J. F. Hu T. Hu Y. Hu G. S. Huang K. X. Huang L. Q. Huang X. T. Huang Y. P. Huang T. Hussain N. Hüsken W. Imoehl J. Jackson S. Jaeger S. Janchiv J. H. Jeong Q. Ji Q. P. Ji X. B. Ji X. L. Ji Y. Y. Ji X. Q. Jia Z. K. Jia H. J. Jiang P. C. Jiang S. S. Jiang T. J. Jiang X. S. Jiang Y. Jiang J. B. Jiao Z. Jiao S. Jin Y. Jin M. Q. Jing T. Johansson X. K. S. Kabana N. Kalantar-Nayestanaki X. L. Kang X. S. Kang M. Kavatsyuk B. C. Ke A. Khoukaz R. Kiuchi R. Kliemt O. B. Kolcu B. Kopf M. Kuessner A. Kupsc W. Kühn J. J. Lane P. Larin A. Lavania L. Lavezzi T. T. Lei Z. H. Lei H. Leithoff M. Lellmann T. Lenz C. Li C. H. Li Cheng Institute of High Energy Physics Beijing 100049 People’s Republic of China Budker Institute of Nuclear Physics SB RAS (BINP) Novosibirsk 630090 Russia Uppsala University Box 516 SE-75120 Uppsala Sweden Zhengzhou University Zhengzhou 450001 People’s Republic of China Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany University of Turin and INFN University of Turin I-10125 Turin Italy INFN I-10125 Turin Italy Liaoning Normal University Dalian 116029 People’s Republic of China 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 Sezione di Ferrara I-44122 Ferrara Italy Peking University Beijing 100871 People’s Republic of China National Centre for Nuclear Research Warsaw 02-093 Poland Institute of Physics and Technology Peace Avenue 54B Ulaanbaatar 13330 Mongolia INFN Laboratori Nazionali di Frascati I-00044 Frascati Italy Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA 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 Turkish Accelerator Center Particle Factory Group Istinye University 34010 Istanbul Turkey Xinyang Normal University Xinyang 464000 People’s Republic of China Nankai University Tianjin 300071 People’s Republic of China Soochow University Suzhou 215006 People’s Republic of China Nanjing University Nanjing 210093 People’s Republic of China Tsinghua University Beijing 100084 People’s Republic of China Institute of Modern Physics Lanzhou 730000 People’s Republic of China Jilin University Changchun 130012 People’s Republic of China Hunan Univers

Evidence for the singly Cabibbo suppressed decay Λc+→pπ0 is reported for the first time with a statistical significance of 3.7σ based on 6.0 fb−1 of e+e− collision data collected at center-of-mass energies between 4.600 and 4.843 GeV with the BESIII detector at the BEPCII collider. The absolute branching fraction of Λc+→pπ0 is measured to be (1.56−0.58+0.72±0.20)×10−4. Combining with the branching fraction of Λc+→nπ+, (6.6±1.3)×10−4, the ratio of the branching fractions of Λc+→nπ+ and Λc+→pπ0 is calculated to be 3.2−1.2+2.2. As an important input for the theoretical models describing the decay mechanisms of charmed baryons, our result indicates that the nonfactorizable contributions play an essential role and their interference with the factorizable contributions should not be significant. In addition, the absolute branching fraction of Λc+→pη is measured to be (1.63±0.31stat±0.11syst)×10−3.

关键词： Branching fraction Hadronic decays Charmed baryons Hadrons

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Search for the light hadron decay χc1(3872)→π+π−η

引用

Physical Review D 2024年第1期109卷 L011102-L011102页

作者： M. Ablikim M. N. Achasov P. Adlarson X. C. Ai R. Aliberti A. Amoroso M. R. An Q. An Y. Bai O. Bakina I. Balossino Y. Ban V. Batozskaya K. Begzsuren N. Berger M. Berlowski M. Bertani D. Bettoni F. Bianchi E. Bianco A. Bortone I. Boyko R. A. Briere A. Brueggemann H. Cai X. Cai A. Calcaterra G. F. Cao N. Cao S. A. Cetin J. F. Chang T. T. Chang W. L. Chang G. R. Che G. Chelkov C. Chen Chao Chen G. Chen H. S. Chen M. L. Chen S. J. Chen S. M. Chen T. Chen X. R. Chen X. T. Chen Y. B. Chen Y. Q. Chen Z. J. Chen W. S. Cheng S. K. Choi X. Chu G. Cibinetto S. C. Coen F. Cossio J. J. Cui H. L. Dai J. P. Dai A. Dbeyssi R. E. de Boer D. Dedovich Z. Y. Deng A. Denig I. Denysenko M. Destefanis F. De Mori B. Ding X. X. Ding Y. Ding J. Dong L. Y. Dong M. Y. Dong X. Dong M. C. Du S. X. Du Z. H. Duan P. Egorov Y. L. Fan J. Fang S. S. Fang W. X. Fang Y. Fang R. Farinelli L. Fava F. Feldbauer G. Felici C. Q. Feng J. H. Feng K. Fischer M. Fritsch C. Fritzsch C. D. Fu J. L. Fu Y. W. Fu H. Gao Y. N. Gao Yang Gao S. Garbolino I. Garzia P. T. Ge Z. W. Ge C. Geng E. M. Gersabeck A. Gilman K. Goetzen L. Gong W. X. Gong W. Gradl S. Gramigna M. Greco M. H. Gu Y. T. Gu C. Y. Guan Z. L. Guan A. Q. Guo L. B. Guo M. J. Guo R. P. Guo Y. P. Guo A. Guskov T. T. Han W. Y. Han X. Q. Hao F. A. Harris K. K. He K. L. He F. H. H. Heinsius C. H. Heinz Y. K. Heng C. Herold T. Holtmann P. C. Hong G. Y. Hou X. T. Hou Y. R. Hou Z. L. Hou H. M. Hu J. F. Hu T. Hu Y. Hu G. S. Huang K. X. Huang L. Q. Huang X. T. Huang Y. P. Huang T. Hussain N. Hüsken W. Imoehl J. Jackson S. Jaeger S. Janchiv J. H. Jeong Q. Ji Q. P. Ji X. B. Ji X. L. Ji Y. Y. Ji X. Q. Jia Z. K. Jia H. J. Jiang P. C. Jiang S. S. Jiang T. J. Jiang X. S. Jiang Y. Jiang J. B. Jiao Z. Jiao S. Jin Y. Jin M. Q. Jing T. Johansson X. K. S. Kabana N. Kalantar-Nayestanaki X. L. Kang X. S. Kang R. Kappert M. Kavatsyuk B. C. Ke A. Khoukaz R. Kiuchi R. Kliemt O. B. Kolcu B. Kopf M. Kuessner A. Kupsc W. Kühn J. J. Lane P. Larin A. Lavania L. Lavezzi T. T. Lei Z. H. Lei H. Leithoff M. Lellmann T. Lenz C. Li C. H. L Institute of High Energy Physics Beijing 100049 People’s Republic of China Budker Institute of Nuclear Physics SB RAS (BINP) Novosibirsk 630090 Russia Uppsala University Box 516 SE-75120 Uppsala Sweden Zhengzhou University Zhengzhou 450001 People’s Republic of China Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany University of Turin and INFN University of Turin I-10125 Turin Italy INFN I-10125 Turin Italy Liaoning Normal University Dalian 116029 People’s Republic of China 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 Sezione di Ferrara INFN Sezione di Ferrara I-44122 Ferrara Italy Peking University Beijing 100871 People’s Republic of China National Centre for Nuclear Research Warsaw 02-093 Poland Institute of Physics and Technology Peace Avenue 54B Ulaanbaatar 13330 Mongolia INFN Laboratori Nazionali di Frascati INFN Laboratori Nazionali di Frascati I-00044 Frascati Italy Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA 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 Turkish Accelerator Center Particle Factory Group Istinye University 34010 Istanbul Turkey Xinyang Normal University Xinyang 464000 People’s Republic of China Nankai University Tianjin 300071 People’s Republic of China Soochow University Suzhou 215006 People’s Republic of China Nanjing University Nanjing 210093 People’s Republic of China Tsinghua University Beijing 100084 People’s Republic of China Institute of Modern Physics Lanzhou 730000 People’s Republic of China Jilin Univer

With a data sample corresponding to an integrated luminosity of 11.5 fb−1 collected with the BESIII detector operating at the BEPCII storage ring, for the first time the light hadron decay χc1(3872)→π+π−η is searched for. While no significant signal is observed, the upper limits at the 90% confidence level for σ[e+e−→γχc1(3872)]B[χc1(3872)→π+π−η] at center of mass energies from 4.13 GeV to 4.34 GeV are determined. By normalizing to the χc1(3872)→π+π−J/ψ decay channel, a 90% confidence level upper limit for the branching fraction ratio R=B[χc1(3872)→π+π−η]/B[χc1(3872)→π+π−J/ψ]<0.12 is given. These measurements provide important inputs for understanding the internal structure of the χc1(3872) resonance.

关键词： Branching fraction Hadronic decays Exotic mesons

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Measurement of the integrated Luminosities of cross-section scan data samples around theψ(3770)mass region

引用

Chinese Physics C 2018年第6期42卷 1-8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 O. Cakir 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 X. R. Chen Y. B. Chen X. K. Chu G. Cibinetto F. Cossio H. a. Dai, J. F. 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. nuan 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 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. F. Guo A. Guskov Z. Haddadi S. Han X. Q. Hao F. A. Harris Z. L. He X. O. He F. H. Heinsius T. Held Y. K. Heng T. Holtmann Z. L. Hou H. M. Hu J. F. gu T. Hu Y. Hu G. S. Huang J. S. Huang X. T. Huang X. Z. Huang Z. L. guang T. Hussain 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 T. Khan A. Khoukaz P. Kiese R. Kliemt L. Koch O. B. Kolcu B. Kopf M. Kornicer M. Kuemmel M. Kuessner A. Kupsc M. Kurth W. Kiihn J. S. Lange M. Lara P. Larin L. Lavezzi S. Leiber H. Leithofi 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 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 L. Z. Liao J. Libby C. X. Lin D. X. Lin S. 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. Liu K. Y. Liu Ke Liu L. D. Liu Q. Liu S B. Y. Zhang144 C. C. Zhang1D. H. Zhang1 H. H. Zhang45H. Y. Zhang144 J. Zhang151 J. L. Zhang65 J. Q. Zhang4 J. W. Zhang1 J. Y. Zhang1 J. Z. Zhang151 K. Zhang151 L. Zhang46 S. F. Zhang35 T. J. Zhang3975 X. Y. Zhang38 Y. Zhang4457 Y. H. Zhang144 Y. T. Zhang4557 Yang Zhang1 Yao Zhang1 Yu Zhang51 Z. H. Zhang6 Z. P. Zhan57Z. Y. Zhang64 G. Zhao1J. W. Zhao144 J. Y. Zhao151 J. Z. Zhao144 Lei Zhao4457 Ling Zhao1 M. G. Zhao35 Q. Zhao1 S. J. Zhao67 T. C. Zhao1 Y. B. Zhao144 Z. G. Zhao4457 A. Zhemehugov2869 B. Zheng58J. P. Zheng144 W. J. Zheng38 Y. H. Zheng51B. Zhong33 L. Zhou144 Q. Zhou151 X. Zhou64 X. K. Zhou4457 X. R. Zhou4457 X. Y. Zhou1 A. N. Zhu151 J. Zhu35 J. Zhu45 K. Zhu1 K. J. Zhu1 S. Zhu1 S. H. Zhu56 X. L. Zhu46 Y. C. Zhu4457 Y. S. Zhu151 Z. A. Zhu151 J. Zhuang144B. S. Zou1 J. H. Zou1 （ 1 Institute of High Energy Physics Beijing 100049 China Beihang University Beijing 100191 China Beijing Institute of Petrochemical Technology Beijing 102617 China Bochum Ruhr-University D-44780 Bochum Germany Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA Central China Normal University Wuhan 430079 China China Center of Advanced Science and Technology Beijing 100190 China COMSATS Institute of Information Technology Lahore Defence Road Off Raiwind Road 54000 Lahore Pakistan G.I. Budker Institute of Nuclear Physics SB RAS （BINP） Novosibirsk 630090 Russia GSI Helmholtzcentre for Heavy Ion Research GmbH D-64291 Darmstadt Germany Guangxi Normal University Guilin 541004 China Guangxi University Nanning 530004 China Hangzhou Normal University Hangzhou 310036 China Helmholtz Institute Mainz JohannwJoachim-Becher-Weg 45 D-55099 Mainz Germany Henan Normal University Xinxiang 453007 China Henan University of Science and Technology Luoyang 471003 China Huangshan College Huangshan 245000 China Hunan Normal University Changsha 410081 China Hunan University Changsha 410082 China Indian Institute of Tec

To investigate the nature of the Ψ（3770） resonance and to measure the cross section for e^＋e^-→DD, a cross-section scan data sample, distributed among 41 center-of-mass energy points from 3.73 to 3.89 GeV, was taken with the BESIII detector operated at the BEPCII collider in the year 2010. By analyzing the large angle Bhabha scattering events, we measure the integrated luminosity of the data sample at each center-of-mass energy point. The total integrated luminosity of the data sample is 76.16±0.04±0.61 pb^-1, where the first uncertainty is statistical and the second systematic.

关键词： Bhabha scattering events integrated luminosity BESⅢ

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Observation of the singly Cabibbo-suppressed decay Λc+→Σ−K+π+

引用

Physical Review D 2024年第7期109卷 L071103-L071103页

The singly Cabibbo-suppressed decay Λc+→Σ−K+π+ is observed for the first time with a statistical significance of 5.4σ by using 4.5 fb−1 of e+e− collision data collected at center-of-mass energies between 4.600 and 4.699 GeV with the BESIII detector at BEPCII. The absolute branching fraction of Λc+→Σ−K+π+ is measured to be (3.8±1.2stat±0.2syst)×10−4 in a model-independent approach. This is the first observation of a Cabibbo-suppressed Λc+ decay involving Σ− in the final state. The ratio of branching fractions between Λc+→Σ−K+π+ and the Cabibbo-favored decay Λc+→Σ−π+π+ is observed to be (0.4±0.1)sc2, where sc≡sinθc=0.2248 with θc the Cabibbo mixing angle.

关键词： Hadronic decays Charmed baryons

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