Using a sample of 1.31×109 J/ψ events collected by the BESIII detector at BEPCII during 2009 and 2012, we study the J/ψ→ωη′π+π- hadronic process. For the first time, we measure the branching ratio B(J/ψ→ωη′π+π-)=(1.12±0.02±0.13)×10-3. We search for the X(1835) state in the η′π+π- invariant mass spectra. No evidence is found and we estimate the upper limit on the branching fraction at 90% confidence level to be B(J/ψ→ωX(1835),X(1835)→η′π+π-)<6.2×10-5.

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;G. Chen;L. Y. Dong;S. S. Fang;L. B. Guo;X. T. Huang;X. B. Ji;Cheng Li;D. M. Li;G. Li;H. B. Li;W. D. Li;X. L. Li;Q. Liu;J. L. Ping;C. F. Qiao;G. Rong;X. Y. Shen;Y. J. Sun;C. J. Tang;X. Tang;Y. F. Wang;Z. J. Xiao;M. H. Ye;C. Z. Yuan;H. H. Zhang;Yang Zhang;Yao Zhang;G. Zhao;Z. G. Zhao;B. S. Zou

Physical Review D

2019-4-1

Based on 448.1×106 ψ(3686) events collected with the BESIII detector, the decays ψ(3686)→γχcJ,χcJ→γγ(J=0,1,2) are studied. The decay branching fractions of χc0,2→γγ are measured to be B(χc0→γγ)=(1.93±0.08±0.05±0.05)×10-4 and B(χc2→γγ)=(3.10±0.09±0.07±0.11)×10-4, which correspond to two-photon decay widths of Γγγ(χc0)=2.03±0.08±0.06±0.13 keV and Γγγ(χc2)=0.60±0.02±0.01±0.04 keV with a ratio of R=Γγγ(χc2)/Γγγ(χc0)=0.295±0.014±0.007±0.027, where the uncertainties are statistical, systematic and associated with the uncertainties of B(ψ(3686)→γχc0,2) and the total widths Γ(χc0,2), respectively. For the forbidden decay of χc1→γγ, no signal is observed, and an upper limit on the two-photon width is obtained to be Γγγ(χc1)<5.3 eV at the 90% confidence level. The ratio of the two-photon widths between helicity-zero and helicity-Two components in the decay χc2→γγ is also measured to be f0/2=Γγγλ=0(χc2)/Γγγλ=2(χc2)=(0.0±0.6±1.2)×10-2, where the uncertainties are statistical and systematic, respectively.

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;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;O. Dorjkhaidav;Z. L. Dou;S. X. Du;P. F. Duan;J. Z. Fan;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. 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. Li;K. Li;K. J. 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. H. Liu;H. H. Liu;H. M. 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;Y. Y. 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. L. Luo;X. R. Lyu;F. C. Ma;H. L. Ma;L. L. Ma;M. M. Ma;Q. M. Ma;T. Ma;X. N. Ma;X. Y. Ma;Y. M. Ma;F. E. Maas;M. Maggiora;Q. A. Malik;Y. J. Mao;Z. P. Mao;S. Marcello;Z. X. Meng;J. G. Messchendorp;G. Mezzadri;J. Min;T. J. Min;R. E. Mitchell;X. H. Mo;Y. J. Mo;C. Morales Morales;G. Morello;N. Yu Muchnoi;H. Muramatsu;P. Musiol;A. Mustafa;Y. Nefedov;F. Nerling;I. B. Nikolaev;Z. Ning;S. Nisar;S. L. Niu;X. Y. Niu;S. L. Olsen;Q. Ouyang;S. Pacetti;Y. Pan;P. Patteri;M. Pelizaeus;J. Pellegrino;H. P. Peng;K. Peters;J. Pettersson;J. L. Ping;R. G. Ping;R. Poling;V. Prasad;H. R. Qi;M. Qi;S. Qian;C. F. Qiao;J. J. Qin;N. Qin;X. S. Qin;Z. H. Qin;J. F. Qiu;K. H. Rashid;C. F. Redmer;M. Richter;M. Ripka;M. Rolo;G. Rong;Ch Rosner;X. D. Ruan;A. Sarantsev;M. Savrié;C. Schnier;K. Schoenning;W. Shan;M. Shao;C. P. Shen;P. X. Shen;X. Y. Shen;H. Y. Sheng;J. J. Song;X. Y. Song;S. Sosio;C. Sowa;S. Spataro;G. X. Sun;J. F. Sun;L. Sun;S. S. Sun;X. H. Sun;Y. J. Sun;Y. K. Sun;Y. Z. Sun;Z. J. Sun;Z. T. Sun;C. J. Tang;G. Y. Tang;X. Tang;I. Tapan;M. Tiemens;B. T. Tsednee;I. Uman;G. S. Varner;B. Wang;B. L. Wang;D. Wang;D. Y. Wang;Dan Wang;K. Wang;L. L. Wang;L. S. Wang;M. Wang;P. Wang;P. L. Wang;W. P. Wang;X. F. Wang;Y. D. Wang;Y. F. Wang;Y. Q. Wang;Z. Wang;Z. G. Wang;Z. H. Wang;Z. Y. Wang;Z. Y. Wang;T. Weber;D. H. Wei;P. Weidenkaff;S. P. Wen;U. Wiedner;M. Wolke;L. H. Wu;L. J. Wu;Z. Wu;L. Xia;Y. Xia;D. Xiao;H. Xiao;Y. J. Xiao;Z. J. Xiao;Y. G. Xie;Y. H. Xie;X. A. Xiong;Q. L. Xiu;G. F. Xu;J. J. Xu;L. Xu;Q. J. Xu;Q. N. Xu;X. P. Xu;L. Yan;W. B. Yan;W. C. Yan;Y. H. Yan;H. J. Yang;H. X. Yang;L. Yang;Y. H. Yang;Y. X. Yang;M. Ye;M. H. Ye;J. H. Yin;Z. Y. You;B. X. Yu;C. X. Yu;J. S. Yu;C. Z. Yuan;Y. Yuan;A. Yuncu;A. A. Zafar;Y. Zeng;Z. Zeng;B. X. Zhang;B. Y. Zhang;C. C. Zhang;D. H. Zhang;H. H. Zhang;H. Y. Zhang;J. Zhang;J. L. Zhang;J. Q. Zhang;J. W. Zhang;J. Y. Zhang;J. Z. Zhang;K. Zhang;L. Zhang;S. Q. Zhang;X. Y. Zhang;Y. Zhang;Y. Zhang;Y. H. Zhang;Y. T. Zhang;Yu Zhang;Z. H. Zhang;Z. P. Zhang;Z. Y. Zhang;G. Zhao;J. W. Zhao;J. Y. Zhao;J. Z. Zhao;Lei Zhao;Ling Zhao;M. G. Zhao;Q. Zhao;S. J. Zhao;T. C. Zhao;Y. B. Zhao;Z. G. Zhao;A. Zhemchugov;B. Zheng;J. P. Zheng;W. J. Zheng;Y. H. Zheng;B. Zhong;L. Zhou;X. Zhou;X. K. Zhou;X. R. Zhou;X. Y. Zhou;Y. X. Zhou;J. Zhu;K. Zhu;K. J. Zhu;S. Zhu;S. H. Zhu;X. L. Zhu;Y. C. Zhu;Y. S. Zhu;Z. A. Zhu;J. Zhuang;L. Zotti;B. S. Zou;J. H. Zou

Physical Review D

2017-11-28

We search for the M1 radiative transition ψ(3686) →γη_c(2S) by reconstructing the exclusive η_c(2S)→KS0K^±π⁺π ⁺π^- decay using 1.06×108 ψ(3686) events collected with the BESIII detector. The signal is observed with a statistical significance of greater than 4 standard deviations. The measured mass of the η_c(2S) is 3646.9±1.6(stat)±3.6(syst) MeV/c2, and the width is 9.9±4.8(stat)±2.9(syst) MeV/c2. The product branching fraction is measured to be B(ψ(3686)→γη_c(2S)) ×B(η_c(2S)→KS0K^±π⁺π ⁺π^-)=(7.03±2.10(stat)±0.70(syst)) ×10^-6. This measurement complements a previous BESIII measurement of ψ(3686)→γη_c(2S) with η_c(2S)→KS0K^±π⁺ and K ⁺K^-π0.

M. Ablikim;M. N. Achasov;O. Albayrak;D. J. Ambrose;F. F. An;Q. An;J. Z. Bai;R. Baldini Ferroli;Y. Ban;J. Becker;J. V. Bennett;M. Bertani;J. M. Bian;E. Boger;O. Bondarenko;I. Boyko;R. A. Briere;H. Cai;H. S. Chen;L. Y. Dong;S. S. Fang;L. B. Guo;Y. Huang;X. B. Ji;Cheng Li;D. M. Li;H. B. Li;W. D. Li;X. L. Li;J. P. Liu;F. C. Ma;J. L. Ping;C. F. Qiao;G. Rong;X. Y. Shen;Y. J. Sun;C. J. Tang;X. Tang;M. Wang;P. Wang;Y. F. Wang;Z. Wang;Z. J. Xiao;M. H. Ye;C. Z. Yuan;H. H. Zhang;J. Y. Zhang;G. Zhao;Z. G. Zhao;B. S. Zou

Physical Review D - Particles, Fields, Gravitation and Cosmology

2013-3-4

By using a 2.92 fb^-1 data sample taken at √s = 3.773 GeV with the BESIII detector operating at the BEPCII collider, we search for the radiative transitions ψ(3770) → γη_c and γη_c(2S) through the hadronic decays η_c(η_c (2S)) → K⁰ _SK^±π⁺. No significant excess of signal events above background is observed. We set upper limits at a 90% confidence level for the product branching fractions to be B(ψ(3770) →γη_c) ±B(η_c → K⁰ _SK^±π⁺) < 1.6× 10^-5 and B(ψ(3770) →γη_c(2S)) ×B(η_c(2S) → K⁰ _SK⁺π⁺) <5.6× 10^-6. Combining our result with world-average values of B(η_c(η_c(2S)) → K⁰ _SK^±π⁺), we find the branching fractions B(ψ(3770) → γη_c) > 6.8 × 10^-4 and B(ψ(3770) → γη_c(2S)) < 2.0 × 10^-3 at a 90% confidence level.

M. Ablikim;M. N. Achasov;X. C. Ai;O. Albayrak;M. Albrecht;D. J. Ambrose;F. F. An;Q. An;J. Z. Bai;R. Baldini Ferroli;Y. Ban;J. V. Bennett;M. Bertani;J. M. Bian;E. Boger;H. Cai;G. Chen;H. S. Chen;X. R. Chen;L. Y. Dong;S. S. Fang;L. B. Guo;X. B. Ji;Cheng Li;D. M. Li;G. Li;H. B. Li;W. D. Li;X. L. Li;J. P. Liu;Q. Liu;F. C. Ma;J. L. Ping;C. F. Qiao;G. Rong;X. Y. Shen;Y. J. Sun;C. J. Tang;X. Tang;M. Wang;Y. F. Wang;Z. Wang;Z. G. Wang;Z. J. Xiao;M. H. Ye;C. Z. Yuan;H. H. Zhang;G. Zhao;Z. G. Zhao;B. S. Zou

Physical Review D - Particles, Fields, Gravitation and Cosmology

2014-6-18

Studies of e⁺e^- → D_s⁺D(∗)⁰ K^- and the -wave charmed-strange mesons are performed based on an e⁺e^- collision data sample corresponding to an integrated luminosity of 567 pb^-1 collected with the BESIII detector at √s = 4.600 GeV. The processes of e⁺e^- → D_s⁺D(∗)⁰ K^- and D_s⁺D(∗)⁰ K^- are observed for the first time and are found to be dominated by the modes D_s⁺ D_s1 (2536)^- and D_s⁺ D_s2∗ (2573)^-, respectively. The Born cross sections are measured to be σ^B (e⁺e^- → D_s⁺D(∗)⁰ K^-) = (10.1 ± 2.3 ± 0.8) pb and σ^B (e⁺e^- → D_s⁺D(∗)⁰ K^-) = (19.4 ± 2.3 ± 1.6) pb, and the products of Born cross section and the decay branching fraction are measured to be σ^B (e⁺e^- → D_s⁺D_s1(2536)^- + c.c.). ℬ(D_s1(2536)^- → D⁰∗ K^-) = (7.5 ± 1.8 ± 0.7) pb and σ^B(e⁺e^- → D_s⁺D_s2∗(2573)^- + c.c.). ℬ(D∗_s2 (2573)^- → D⁰K^-) = (19.7 ± 2.9 ± 2.0) pb. For the D_s1(2536)^-1 and D∗_s2 (2573)^- mesons, the masses and widths are measured to be M(D_s1(2536)^-1) = (2537.7 ± 0.5 ± 3.1) MeV/c², λ(D∗_s2(2573)^-1) = (17.2 ± 3.6 ± 1.1) MeV. The spin-parity of the D∗_s2 (2573)^- meson is determined to be J_p = 2⁺. In addition, the processes e⁺e^- → D_s⁺D(∗)⁰ K^- are searched for using the data samples taken at four (two) center-of-mass energies between 4.416 (4.527) and 4.575 GeV, and upper limits at the 90% confidence level on the cross sections are determined.

M. Ablikim;M. N. Achasov;S. Ahmed;M. Albrecht;M. Alekseev;A. Amoroso;F. F. An;琪 安;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;国明 冼;H. S. Chen;J. C. Chen;M. L. Chen;S. J. Chen;Y. B. Chen;W. S. 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;燎原 董;M. Y. Dong;Z. L. Dou;S. X. Du;J. Z. Fan;J. Fang;双世 房;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. N. 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;立波 郭;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;性涛 黄;X. Z. Huang;Z. L. Huang;N. Huesken;T. Hussain;W. Ikegami Andersson;W. Imoehl;M. Irshad;Q. Ji;Q. P. Ji;晓斌 季;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;澄 李;德民 李;F. Li;F. Y. Li;钢 李;海波 李;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;卫东 李;W. G. Li;晓磊 李;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;Kai Liu;Ke Liu;前 刘;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. Lu;Y. Lu;Y. P. Lu;C. L. Luo;M. X. Luo;P. W. Luo;T. Luo;X. L. Luo;S. Lusso;X. R. Lyu;F. C. Ma;H. L. Ma;L. L. Ma;M. M. Ma;Q. M. Ma;X. N. Ma;X. X. Ma;X. Y. Ma;Y. M. Ma;F. E. Maas;M. Maggiora;S. Maldaner;Q. A. Malik;A. Mangoni;Y. J. Mao;Z. P. Mao;S. Marcello;Z. X. Meng;J. G. Messchendorp;G. Mezzadri;J. Min;T. J. Min;R. E. Mitchell;X. H. Mo;Y. J. Mo;C. Morales Morales;N. Yu Muchnoi;H. Muramatsu;A. Mustafa;S. Nakhoul;Y. Nefedov;F. Nerling;I. B. Nikolaev;Z. Ning;S. Nisar;S. L. Niu;S. L. Olsen;Q. Ouyang;S. Pacetti;Y. Pan;M. Papenbrock;P. Patteri;M. Pelizaeus;H. P. Peng;K. Peters;J. Pettersson;加伦 平;R. G. Ping;A. Pitka;R. Poling;V. Prasad;M. Qi;T. Y. Qi;S. Qian;从丰 乔;N. Qin;X. S. Qin;Z. H. Qin;J. F. Qiu;S. Q. Qu;K. H. Rashid;C. F. Redmer;M. Richter;M. Ripka;A. Rivetti;M. Rolo;刚 荣;Ch Rosner;M. Rump;A. Sarantsev;M. Savrié;K. Schoenning;W. Shan;X. Y. Shan;M. Shao;C. P. Shen;P. X. Shen;肖雁 沈;H. Y. Sheng;X. Shi;J. J. Song;X. Y. Song;S. Sosio;C. Sowa;S. Spataro;F. F. Sui;G. X. Sun;J. F. Sun;L. Sun;S. S. Sun;X. H. Sun;洁琬 孙;Y. K. Sun;Y. Z. Sun;Z. J. Sun;Z. T. Sun;Y. T. Tan;昌建 唐;G. Y. Tang;孝威 唐;M. Tiemens;B. Tsednee;I. Uman;B. Wang;B. L. Wang;C. W. Wang;D. Y. Wang;H. H. Wang;K. Wang;L. L. Wang;L. S. Wang;M. Wang;Meng Wang;平 王;P. L. Wang;R. M. Wang;W. P. Wang;X. F. Wang;Y. Wang;贻芳 王;Z. Wang;Z. G. Wang;Z. Y. Wang;Zongyuan Wang;T. Weber;D. H. Wei;P. Weidenkaff;S. P. Wen;U. Wiedner;M. Wolke;L. H. Wu;L. J. Wu;Z. Wu;L. Xia;Y. Xia;Y. J. Xiao;振军 肖;Y. G. Xie;Y. H. Xie;X. A. Xiong;Q. L. Xiu;G. F. Xu;L. Xu;Q. J. Xu;W. Xu;X. P. Xu;F. Yan;L. Yan;W. B. Yan;W. C. Yan;Y. H. Yan;H. J. Yang;H. X. Yang;L. Yang;R. X. Yang;S. L. Yang;Y. H. Yang;Y. X. Yang;Yifan Yang;Z. Q. Yang;M. Ye;铭汉 叶;J. H. Yin;Z. Y. You;B. X. Yu;C. X. Yu;J. S. Yu;长征 苑;Y. Yuan;A. Yuncu;A. A. Zafar;Y. Zeng;B. X. Zhang;B. Y. Zhang;C. C. Zhang;D. H. Zhang;宏浩 张;H. Y. Zhang;J. Zhang;J. L. Zhang;J. Q. Zhang;J. W. Zhang;J. Y. Zhang;J. Z. Zhang;K. Zhang;L. Zhang;S. F. Zhang;T. J. Zhang;X. Y. Zhang;Y. Zhang;Y. H. Zhang;Y. T. Zhang;阳 张;尧 张;Yu Zhang;Z. H. Zhang;Z. P. Zhang;Z. Y. Zhang;广 赵;J. W. Zhao;J. Y. Zhao;J. Z. Zhao;Lei Zhao;Ling Zhao;M. G. Zhao;Q. Zhao;S. J. Zhao;T. C. Zhao;Y. B. Zhao;政国 赵;A. Zhemchugov;B. Zheng;J. P. Zheng;Y. H. Zheng;B. Zhong;L. Zhou;Q. Zhou;X. Zhou;X. K. Zhou;X. R. Zhou;Xiaoyu Zhou;Xu Zhou;A. N. Zhu;J. Zhu;J. Zhu;K. Zhu;K. J. Zhu;S. H. Zhu;X. L. Zhu;Y. C. Zhu;Y. S. Zhu;Z. A. Zhu;J. Zhuang;冰松 邹;J. H. Zou

Chinese Physics C

2019

With a sample of (225.2±2.8)×106 J/ψ events registered in the BESIII detector, J/ψ→γπ⁺π ^-η^′ is studied using two η^′ decay modes: η^′→π⁺π^-η and η^′→γρ0. The X(1835), which was previously observed by BESII, is confirmed with a statistical significance that is larger than 20σ. In addition, in the π⁺π ^-η^′ invariant-mass spectrum, the X(2120) and the X(2370), are observed with statistical significances larger than 7.2σ and 6.4σ, respectively. For the X(1835), the angular distribution of the radiative photon is consistent with expectations for a pseudoscalar.

M. Ablikim;M. N. Achasov;L. An;琪 安;Z. H. An;J. Z. Bai;R. Baldini;Y. Ban;J. Becker;N. Berger;M. Bertani;J. M. Bian;I. Boyko;R. A. Briere;V. Bytev;X. Cai;G. F. Cao;X. X. Cao;J. F. Chang;G. Chelkov;国明 冼;和生 陈;J. C. Chen;M. L. Chen;S. J. Chen;Y. Chen;蕴博 陈;H. P. Cheng;Y. P. Chu;D. Cronin-Hennessy;H. L. Dai;J. P. Dai;D. Dedovich;Z. Y. Deng;I. Denysenko;M. Destefanis;Y. Ding;燎原 董;M. Y. Dong;S. X. Du;M. Y. Duan;R. R. Fan;J. Fang;双世 房;F. Feldbauer;C. Q. Feng;C. D. Fu;J. L. Fu;Y. Gao;C. Geng;K. Goetzen;W. X. Gong;M. Greco;S. Grishin;M. H. Gu;Y. T. Gu;Y. H. Guan;A. Q. Guo;立波 郭;Y. P. Guo;X. Q. Hao;F. A. Harris;K. L. He;M. He;Z. Y. He;Y. K. Heng;Z. L. Hou;H. M. Hu;J. F. Hu;T. Hu;B. Huang;G. M. Huang;J. S. Huang;X. T. Huang;Y. P. Huang;T. Hussain;C. S. Ji;Q. Ji;晓斌 季;X. L. Ji;L. K. Jia;L. L. Jiang;X. S. Jiang;J. B. Jiao;Z. Jiao;D. P. Jin;S. Jin;F. F. Jing;M. Kavatsyuk;S. Komamiya;W. Kuehn;J. S. Lange;J. K.C. Leung;澄 李;Cui Li;德民 李;F. Li;钢 李;海波 李;J. C. Li;Lei Li;N. B. Li;Q. J. Li;卫东 李;W. G. Li;晓磊 李;X. N. Li;X. Q. Li;X. R. Li;Z. B. Li;H. Liang;Y. F. Liang;Y. T. Liang;G. R. Liao;X. T. Liao;B. J. Liu;B. J. Liu;C. L. Liu;C. X. Liu;C. Y. Liu;F. H. Liu;Fang Liu;Feng Liu;G. C. Liu;H. Liu;H. B. Liu;H. M. Liu;H. W. Liu;觉平 刘;K. Liu;K. Y. Liu;前 刘;S. B. Liu;X. Liu;X. H. Liu;Y. B. Liu;Y. W. Liu;Yong Liu;Z. A. Liu;Z. Q. Liu;H. Loehner;G. R. Lu;H. J. Lu;J. G. Lu;Q. W. Lu;X. R. Lu;Y. P. Lu;C. L. Luo;M. X. Luo;T. Luo;X. L. Luo;C. L. Ma;凤才 马;H. L. Ma;Q. M. Ma;T. Ma;X. Ma;X. Y. Ma;M. Maggiora;Q. A. Malik;H. Mao;Y. J. Mao;Z. P. Mao;J. G. Messchendorp;J. Min;R. E. Mitchell;X. H. Mo;C. Motzko;N. Yu Muchnoi;Y. Nefedov;Z. Ning;S. L. Olsen;Q. Ouyang;S. Pacetti;M. Pelizaeus;K. Peters;加伦 平;R. G. Ping;R. Poling;C. S.J. Pun;M. Qi;S. Qian;从丰 乔;X. S. Qin;J. F. Qiu;K. H. Rashid;刚 荣;X. D. Ruan;A. Sarantsev;J. Schulze;M. Shao;C. P. Shen;肖雁 沈;H. Y. Sheng;M. R. Shepherd;X. Y. Song;S. Sonoda;S. Spataro;B. Spruck;D. H. Sun;G. X. Sun;J. F. Sun;S. S. Sun;X. D. Sun;洁琬 孙;Y. Z. Sun;Z. J. Sun;Z. T. Sun;昌建 唐;孝威 唐;X. F. Tang;H. L. Tian;D. Toth;G. S. Varner;X. Wan;B. Q. Wang;K. Wang;L. L. Wang;L. S. Wang;萌 王;P. Wang;P. L. Wang;Q. Wang;S. G. Wang;X. L. Wang;Y. D. Wang;贻芳 王;Y. Q. Wang;Z. Wang;志刚 王;Z. Y. Wang;D. H. Wei;S. P. Wen;U. Wiedner;L. H. Wu;N. Wu;W. Wu;Z. Wu;振军 肖;Y. G. Xie;G. F. Xu;G. M. Xu;H. Xu;Y. Xu;Z. R. Xu;Z. Z. Xu;Z. Xue;L. Yan;W. B. Yan;Y. H. Yan;H. X. Yang;敏 杨;T. Yang;Y. Yang;Y. X. Yang;M. Ye;铭汉 叶;B. X. Yu;C. X. Yu;L. Yu;长征 苑;W. L. Yuan;Y. Yuan;A. A. Zafar;A. Zallo;Y. Zeng;B. X. Zhang;B. Y. Zhang;C. C. Zhang;D. H. Zhang;宏浩 张;H. Y. Zhang;J. Zhang;J. W. Zhang;J. Y. Zhang;J. Z. Zhang;L. Zhang;S. H. Zhang;T. R. Zhang;X. J. Zhang;X. Y. Zhang;Y. Zhang;Y. H. Zhang;Z. P. Zhang;Z. Y. Zhang;广 赵;H. S. Zhao;Jiawei Zhao;Jingwei Zhao;Lei Zhao;Ling Zhao;M. G. Zhao;Q. Zhao;S. J. Zhao;T. C. Zhao;X. H. Zhao;Y. B. Zhao;政国 赵;Z. L. Zhao;A. Zhemchugov;B. Zheng;J. P. Zheng;Y. H. Zheng;Z. P. Zheng;B. Zhong;J. Zhong;L. Zhong;L. Zhou;X. K. Zhou;X. R. Zhou;C. Zhu;K. Zhu;K. J. Zhu;S. H. Zhu;X. L. Zhu;X. W. Zhu;Y. S. Zhu;Z. A. Zhu;J. Zhuang;冰松 邹;J. H. Zou;J. X. Zuo;P. Zweber

Physical Review Letters

2011-2-16

Using a sample of 106 million ψ(3686) decays, ψ(3686)→γχcJ(J=0,1,2) and ψ(3686)→γχcJ,χcJ→γJ/ψ(J=1,2) events are utilized to study inclusive χcJ→anything, χcJ→hadrons, and J/ψ→anything distributions, including distributions of the number of charged tracks, electromagnetic calorimeter showers, and π0s, and to compare them with distributions obtained from the BESIII Monte Carlo simulation. Information from each Monte Carlo simulated decay event is used to construct matrices connecting the detected distributions to the input predetection "produced"distributions. Assuming these matrices also apply to data, they are used to predict the analogous produced distributions of the decay events. Using these, the charged particle multiplicities are compared with results from MARK I. Further, comparison of the distributions of the number of photons in data with those in Monte Carlo simulation indicates that G-parity conservation should be taken into consideration in the simulation.

M. Ablikim;M. N. Achasov;P. Adlarson;S. Ahmed;M. Albrecht;A. Amoroso;Q. An; Anita;Y. Bai;O. Bakina;R. Baldini Ferroli;I. Balossino;Y. Ban;K. Begzsuren;J. V. Bennett;N. Berger;M. Bertani;D. Bettoni;F. Bianchi;J. Biernat;J. Bloms;A. Bortone;I. Boyko;G. Chen;X. R. Chen;J. P. Dai;L. Y. Dong;S. S. Fang;L. B. Guo;X. T. Huang;X. B. Ji;Cheng Li;D. M. Li;G. Li;H. B. Li;W. D. Li;X. L. Li;Q. Liu;J. L. Ping;G. Rong;X. Y. Shen;Y. J. Sun;C. J. Tang;Z. J. Xiao;H. J. Yang;M. H. Ye;C. Z. Yuan;Yao Zhang;G. Zhao;Z. G. Zhao

Physical Review D

2020-9

By analyzing 482 pb-1 of e+e- collision data collected at the center-of-mass energy s=4.009 GeV with the BESIII detector, we measure the branching fractions for the semi-leptonic decays Ds+→φe+νe, φμ+νμ, ημ+νμ and η′μ+νμ to be B(Ds+→φe+νe)=(2.26±0.45±0.09)%, B(Ds+→φμ+νμ)=(1.94±0.53±0.09)%, B(Ds+→ημ+νμ)=(2.42±0.46±0.11)% and B(Ds+→η′μ+νμ)=(1.06±0.54±0.07)%, where the first and second uncertainties are statistical and systematic, respectively. The branching fractions for the three semi-muonic decays Ds+→φμ+νμ,ημ+νμ and η′μ+νμ are determined for the first time and that of Ds+→φe+νe is consistent with the world average value within uncertainties.

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;H. Cai;G. Chen;H. S. Chen;X. R. Chen;J. P. Dai;L. Y. Dong;S. S. Fang;L. B. Guo;X. T. Huang;X. B. Ji;Cheng Li;D. M. Li;G. Li;H. B. Li;W. D. Li;X. L. Li;J. P. Liu;Q. Liu;J. L. Ping;C. F. Qiao;G. Rong;X. Y. Shen;Y. J. Sun;C. J. Tang;X. Tang;P. Wang;Y. F. Wang;Z. Y. Wang;Z. J. Xiao;H. J. Yang;M. H. Ye;C. Z. Yuan;H. H. Zhang;Y. Zhang;Y. Zhang;G. Zhao;Z. G. Zhao;B. S. Zou

Physical Review D

2018-1-1

We extract the e⁺e^-→π⁺π^- cross section in the energy range between 600 and 900 MeV, exploiting the method of initial state radiation. A data set with an integrated luminosity of 2.93 fb^-1 taken at a center-of-mass energy of 3.773 GeV with the BESIII detector at the BEPCII collider is used. The cross section is measured with a systematic uncertainty of 0.9%. We extract the pion form factor |F_π|² as well as the contribution of the measured cross section to the leading-order hadronic vacuum polarization contribution to (g-2)_μ. We find this value to be aμππ,LO(600-900MeV)=(368.2±2.5stat±3.3sys)10-10, which is between the corresponding values using the BaBar or KLOE data.

M. Ablikim;M. N. Achasov;X. C. Ai;O. Albayrak;M. Albrecht;D. J. Ambrose;A. Amoroso;F. F. An;Q. An;J. Z. Bai;R. Baldini Ferroli;Y. Ban;D. W. Bennett;H. Cai;G. Chen;H. S. Chen;X. R. Chen;J. P. Dai;L. Y. Dong;S. S. Fang;L. B. Guo;X. T. Huang;X. B. Ji;Cheng Li;D. M. Li;G. Li;H. B. Li;W. D. Li;X. L. Li;J. P. Liu;Q. Liu;J. L. Ping;C. F. Qiao;G. Rong;X. Y. Shen;Y. J. Sun;C. J. Tang;X. Tang;P. Wang;Y. F. Wang;Z. Wang;Z. J. Xiao;H. J. Yang;M. H. Ye;C. Z. Yuan;H. H. Zhang;J. Y. Zhang;G. Zhao;Z. G. Zhao;B. S. Zou

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

2016-2-10

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

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;J. P. Dai;L. Y. Dong;S. S. Fang;L. B. Guo;X. T. Huang;X. B. Ji;Cheng Li;D. M. Li;H. B. Li;W. D. Li;X. L. Li;Q. Liu;J. L. Ping;G. Rong;X. Y. Shen;L. Sun;Y. J. Sun;C. J. Tang;X. Tang;Z. J. Xiao;H. J. Yang;M. H. Ye;C. Z. Yuan;H. H. Zhang;Yang Zhang;Yao Zhang;G. Zhao;Z. G. Zhao

Physical Review Letters

2020-1-24