Using 2917^{pb -1} of data accumulated at 3.773GeV, 44.5^{pb -1} of data accumulated at 3.65GeV and data accumulated during a ψ(3770) line-shape scan with the BESIII detector, the reaction e+e-→pp- is studied considering a possible interference between resonant and continuum amplitudes. The cross section of e+e-→ψ(3770)→pp-, σ(e+e-→ψ(3770)→pp-), is found to have two solutions, determined to be (0.059-0.020+0.070±0.012)pb with the phase angle φ=(255.8-26.6+39.0±4.8)° (<0.166pb at the 90% confidence level), or σ(e+e-→ψ(3770)→pp-)=(2.57-0.13+0.12±0.12)pb with φ=(266.9-6.3+6.1±0.9)° both of which agree with a destructive interference. Using the obtained cross section of ψ(3770)→pp-, the cross section of pp-→ψ(3770), which is useful information for the future PANDA experiment, is estimated to be either (9.8-3.9+11.8)nb (<27.5nb at 90% C.L.) or (425.6-43.7+42.9)nb.

M. Ablikim;M. N. Achasov;X. C. Ai;O. Albayrak;M. Albrecht;D. J. Ambrose;F. F. An;琪 安;J. Z. Bai;R. Baldini Ferroli;Y. Ban;J. V. Bennett;M. Bertani;J. M. Bian;E. Boger;O. Bondarenko;I. Boyko;S. Braun;R. A. Briere;浩 蔡;X. Cai;O. Cakir;A. Calcaterra;G. F. Cao;S. A. Cetin;和生 陈;旭荣 陈;燎原 董;双世 房;立波 郭;海波 李;卫东 李;晓磊 李;觉平 刘;翔 刘;凤才 马;加伦 平;建国 陈;肖雁 沈;洁琬 孙;昌建 唐;萌 王;贻芳 王;振军 肖;铭汉 叶;长征 苑;宏浩 张;政国 赵;阳恒 郑;冰松 邹

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

2014-7-30

The cross sections of the process e+e-→ηJ/ψ at center-of-mass energies (s) between 3.81 and 4.60 GeV are measured with high precision by using data samples collected with the BESIII detector operating at the BEPCII storage ring. Three structures are observed by analyzing the line shape of the measured cross sections, and a maximum-likelihood fit including three resonances is performed by assuming the lowest lying structure is the ψ(4040). For the other resonances, we obtain masses of (4218.6±3.8±2.5) and (4382.0±13.3±1.7) MeV/c2 with corresponding widths of (82.0±5.7±0.4) and (135.8±60.8±22.5) MeV, respectively, where the first uncertainties are statistical and the second ones systematic. The measured resonant parameters are consistent with those of the Y(4220) and Y(4390) from previous measurements of different final states. For the first time, we observe the decays of the Y(4220) and Y(4390) into ηJ/ψ final states.

M. Ablikim;M. N. Achasov;P. Adlarson;S. Ahmed;M. Albrecht;A. Amoroso;琪 安; Anita;Y. Bai;O. Bakina;R. Baldini Ferroli;I. Balossino;Y. Ban;K. Begzsuren;J. V. Bennett;N. Berger;M. Bertani;D. Bettoni;F. Bianchi;J. Biernat;J. Bloms;A. Bortone;I. Boyko;R. A. Briere;H. Cai;X. Cai;A. Calcaterra;G. F. Cao;N. Cao;S. A. Cetin;J. F. Chang;W. L. Chang;G. Chelkov;D. Y. Chen;G. Chen;H. S. Chen;M. L. Chen;S. J. Chen;旭荣 陈;Y. B. Chen;W. S. Cheng;G. Cibinetto;F. Cossio;X. F. Cui;H. L. Dai;J. P. Dai;X. C. Dai;A. Dbeyssi;R. B. De Boer;D. Dedovich;Z. Y. Deng;A. Denig;I. Denysenko;M. Destefanis;F. De Mori;Y. Ding;C. Dong;J. Dong;燎原 董;M. Y. Dong;S. X. Du;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;X. L. Gao;Y. Gao;Y. Gao;Y. G. Gao;I. Garzia;E. M. Gersabeck;A. Gilman;K. Goetzen;L. Gong;W. X. Gong;W. Gradl;M. Greco;L. M. Gu;M. H. Gu;S. Gu;Y. T. Gu;C. Y. Guan;A. Q. Guo;立波 郭;R. P. Guo;Y. P. Guo;Y. P. Guo;A. Guskov;S. Han;T. T. Han;T. Z. Han;X. Q. Hao;F. A. Harris;K. L. He;F. H. Heinsius;T. Held;Y. K. Heng;M. Himmelreich;T. Holtmann;Y. R. Hou;Z. L. Hou;H. M. Hu;J. F. Hu;T. Hu;Y. Hu;G. S. Huang;L. Q. Huang;性涛 黄;Z. Huang;N. Huesken;T. Hussain;W. Ikegami Andersson;W. Imoehl;M. Irshad;S. Jaeger;S. Janchiv;Q. Ji;Q. P. Ji;X. B. Ji;X. L. Ji;H. B. Jiang;X. S. Jiang;X. Y. Jiang;J. B. Jiao;Z. Jiao;S. Jin;Y. Jin;T. Johansson;N. Kalantar-Nayestanaki;X. S. Kang;R. Kappert;M. Kavatsyuk;B. C. Ke;I. K. Keshk;A. Khoukaz;P. Kiese;R. Kiuchi;R. Kliemt;L. Koch;O. B. Kolcu;B. Kopf;M. Kuemmel;M. Kuessner;A. Kupsc;M. G. Kurth;W. Kühn;J. J. Lane;J. S. Lange;P. Larin;L. Lavezzi;H. Leithoff;M. Lellmann;T. Lenz;C. Li;C. H. Li;Cheng Li;D. M. Li;F. Li;钢 李;海波 李;H. J. Li;J. L. Li;J. Q. Li;Ke Li;L. K. Li;Lei Li;P. L. Li;P. R. Li;S. Y. Li;卫东 李;W. G. Li;X. H. Li;晓磊 李;Z. B. Li;Z. Y. Li;H. Liang;H. Liang;Y. F. Liang;Y. T. Liang;L. Z. Liao;J. Libby;C. X. Lin;B. Liu;B. J. Liu;C. X. Liu;D. Liu;D. Y. Liu;F. H. Liu;Fang Liu;Feng Liu;H. B. Liu;H. M. Liu;Huanhuan Liu;Huihui Liu;J. B. Liu;J. Y. Liu;K. Liu;K. Y. Liu;Ke Liu;L. Liu;前 刘;S. B. Liu;Shuai Liu;T. Liu;翔 刘;Y. B. Liu;Z. A. Liu;Z. Q. Liu;Y. F. Long;X. C. Lou;F. X. Lu;H. J. Lu;J. D. Lu;J. G. Lu;X. L. 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;凤才 马;H. L. Ma;L. L. Ma;M. M. Ma;Q. M. Ma;R. Q. Ma;R. T. Ma;X. N. Ma;X. X. Ma;X. Y. Ma;Y. M. Ma;F. E. Maas;M. Maggiora;S. Maldaner;S. Malde;Q. A. Malik;A. Mangoni;Y. J. Mao;Z. P. Mao;S. Marcello;Z. X. Meng;J. G. Messchendorp;G. Mezzadri;T. J. Min;R. E. Mitchell;X. H. Mo;Y. J. Mo;N. Yu Muchnoi;H. Muramatsu;S. Nakhoul;Y. Nefedov;F. Nerling;I. B. Nikolaev;Z. Ning;S. Nisar;S. L. Olsen;Q. Ouyang;S. Pacetti;X. Pan;Y. Pan;A. Pathak;P. Patteri;M. Pelizaeus;H. P. Peng;K. Peters;J. Pettersson;加伦 平;R. G. Ping;A. Pitka;R. Poling;V. Prasad;H. Qi;H. R. Qi;M. Qi;T. Y. Qi;S. Qian;W. B. Qian;Z. Qian;C. F. Qiao;L. Q. Qin;X. P. Qin;X. S. Qin;Z. H. Qin;J. F. Qiu;S. Q. Qu;K. H. Rashid;K. Ravindran;C. F. Redmer;A. Rivetti;V. Rodin;M. Rolo;建国 陈;Ch Rosner;M. Rump;A. Sarantsev;Y. Schelhaas;C. Schnier;K. Schoenning;D. C. Shan;W. Shan;X. Y. Shan;M. Shao;C. P. Shen;P. X. Shen;肖雁 沈;H. C. Shi;R. S. Shi;X. Shi;X. D. Shi;J. J. Song;Q. Q. Song;W. M. Song;Y. X. Song;S. Sosio;S. Spataro;F. F. Sui;G. X. Sun;J. F. Sun;L. Sun;S. S. Sun;T. Sun;W. Y. Sun;洁琬 孙;Y. K. Sun;Y. Z. Sun;Z. T. Sun;Y. H. Tan;Y. X. Tan;昌建 唐;G. Y. Tang;J. Tang;V. Thoren;B. Tsednee;I. Uman;B. Wang;B. L. Wang;C. W. Wang;D. Y. Wang;H. P. Wang;K. Wang;L. L. Wang;M. Wang;M. Z. Wang;Meng Wang;W. H. Wang;W. P. Wang;X. Wang;X. F. Wang;X. L. Wang;Y. Wang;Y. Wang;Y. D. Wang;贻芳 王;Y. Q. Wang;Z. Wang;Z. Y. Wang;Ziyi Wang;Zongyuan Wang;T. Weber;D. H. Wei;P. Weidenkaff;F. Weidner;S. P. Wen;D. J. White;U. Wiedner;G. Wilkinson;M. Wolke;L. Wollenberg;J. F. Wu;L. H. Wu;L. J. Wu;X. Wu;Z. Wu;L. Xia;H. Xiao;S. Y. Xiao;Y. J. Xiao;振军 肖;X. H. Xie;Y. G. Xie;Y. H. Xie;T. Y. Xing;X. A. Xiong;G. F. Xu;J. J. Xu;Q. J. Xu;W. Xu;X. P. Xu;L. Yan;L. Yan;W. B. Yan;W. C. Yan;Xu Yan;H. J. Yang;H. X. Yang;L. Yang;R. X. Yang;S. L. Yang;Y. H. Yang;Y. X. Yang;Yifan Yang;Zhi Yang;铭汉 叶;M. H. Ye;J. H. Yin;Z. Y. You;B. X. Yu;C. X. Yu;G. Yu;J. S. Yu;T. Yu;长征 苑;W. Yuan;X. Q. Yuan;Y. Yuan;Z. Y. Yuan;C. X. Yue;A. Yuncu;A. A. Zafar;Y. Zeng;B. X. Zhang;Guangyi Zhang;宏浩 张;H. Y. Zhang;J. L. Zhang;J. Q. Zhang;J. W. Zhang;J. Y. Zhang;J. Z. Zhang;Jianyu Zhang;Jiawei Zhang;L. Zhang;Lei Zhang;S. Zhang;S. F. Zhang;T. J. Zhang;X. Y. Zhang;Y. Zhang;Y. H. Zhang;Y. T. Zhang;Yan Zhang;尧 张;Yi Zhang;Z. H. Zhang;Z. Y. Zhang;G. Zhao;J. Zhao;J. Y. Zhao;J. Z. Zhao;Lei Zhao;Ling Zhao;M. G. Zhao;Q. Zhao;S. J. Zhao;Y. B. Zhao;Y. X.Zhao Zhao;政国 赵;A. Zhemchugov;B. Zheng;J. P. Zheng;Y. Zheng;阳恒 郑;B. Zhong;C. Zhong;L. P. Zhou;Q. Zhou;X. Zhou;X. K. Zhou;X. R. Zhou;A. N. Zhu;J. Zhu;K. Zhu;K. J. Zhu;S. H. Zhu;W. J. Zhu;X. L. Zhu;Y. C. Zhu;Z. A. Zhu;冰松 邹;J. H. Zou

Physical Review D

2020-8-15

The decay modes J/ψ→γπ0, γη and γη′ are analyzed using a data sample of 58×106 J/ψ decays collected with the BESII detector at the BEPC. The branching fractions are determined to be: Br(J/ψ→γπ0)=(3.13-0.47+0.65)×10-5, Br(J/ψ→γη)=(11.23±0.89)×10-4, and Br(J/ψ→γη′)=(5.55±0.44)×10-3, where the errors are combined statistical and systematic errors. The ratio of partial widths Γ(J/ψ→γη′)/Γ(J/ ψ→γη) is measured to be 4.94±0.40, and the singlet-octet pseudoscalar mixing angle of η-η′ system is determined.

M. Ablikim;J. Z. Bai;Y. Ban;J. G. Bian;X. Cai;H. F. Chen;H. S. Chen;H. X. Chen;J. C. Chen;Jin Chen;Y. B. Chen;S. P. Chi;Y. P. Chu;X. Z. Cui;Y. S. Dai;L. Y. Diao;Z. Y. Deng;Q. F. Dong;S. X. Du;J. Fang;双世 房;C. D. Fu;C. S. Gao;Y. N. Gao;S. D. Gu;Y. T. Gu;Y. N. Guo;Y. Q. Guo;Z. J. Guo;F. A. Harris;K. L. He;M. He;Y. K. Heng;H. M. Hu;T. Hu;G. S. Huang;X. T. Huang;X. B. Ji;X. S. Jiang;X. Y. Jiang;J. B. Jiao;D. P. Jin;S. Jin;Yi Jin;Y. F. Lai;G. Li;海波 李;H. H. Li;J. Li;R. Y. Li;S. M. Li;卫东 李;W. G. Li;晓磊 李;X. N. Li;X. Q. Li;Y. L. Li;Y. F. Liang;H. B. Liao;B. J. Liu;C. X. Liu;F. Liu;Fang Liu;H. H. Liu;H. M. Liu;J. Liu;J. B. Liu;觉平 刘;Q. Liu;R. G. Liu;Z. A. Liu;Y. C. Lou;F. Lu;G. R. Lu;J. G. Lu;C. L. Luo;凤才 马;H. L. Ma;L. L. Ma;Q. M. Ma;X. B. Ma;Z. P. Mao;X. H. Mo;J. Nie;S. L. Olsen;H. P. Peng;R. G. Ping;N. D. Qi;H. Qin;J. F. Qiu;Z. Y. Ren;建国 陈;L. Y. Shan;L. Shang;C. P. Shen;D. L. Shen;肖雁 沈;H. Y. Sheng;H. S. Sun;J. F. Sun;S. S. Sun;Y. Z. Sun;Z. J. Sun;Z. Q. Tan;X. Tang;G. L. Tong;G. S. Varner;D. Y. Wang;L. Wang;L. L. Wang;L. S. Wang;萌 王;平 王;P. L. Wang;W. F. Wang;贻芳 王;Z. Wang;Z. Y. Wang;Zhe Wang;Zheng Wang;C. L. Wei;D. H. Wei;N. Wu;X. M. Xia;X. X. Xie;G. F. Xu;X. P. Xu;Y. Xu;M. L. Yan;H. X. Yang;Y. X. Yang;铭汉 叶;Y. X. Ye;Z. Y. Yi;G. W. Yu;长征 苑;J. M. Yuan;Y. Yuan;S. L. Zang;Y. Zeng;Yu Zeng;B. X. Zhang;B. Y. Zhang;C. C. Zhang;D. H. Zhang;洪起 张;H. Y. Zhang;J. W. Zhang;J. Y. Zhang;S. H. Zhang;X. M. Zhang;X. Y. Zhang;Yiyun Zhang;Z. P. Zhang;D. X. Zhao;J. W. Zhao;M. G. Zhao;P. P. Zhao;W. R. Zhao;政国 赵;汉青 郑;J. P. Zheng;Z. P. Zheng;L. Zhou;N. F. Zhou;K. J. Zhu;Q. M. Zhu;Y. C. Zhu;Y. S. Zhu;Yingchun Zhu;Z. A. Zhu;B. A. Zhuang;X. A. Zhuang;冰松 邹

Physical Review D - Particles, Fields, Gravitation and Cosmology

2006

For high-energy long baseline neutrino oscillation experiments, we propose a figure of merit criterion to compare the statistical quality of experiments at various baseline lengths under the condition of identical detectors and a given neutrino beam. We take into account all possible experimental errors under general consideration. In this way, the figure of merit is closely related to the usual statistical criterion of number of sigmas. We use a realistic neutrino beam for an entry-level neutrino factory and a possible superbeam from a meson source and a 100 kt detector for the calculation. We consider in detail four baseline lengths—300 km, 700 km, 2100 km, and 3000 km in the neutrino energy range of 0.5–20 GeV for a 20 GeV entry-level neutrino factory and a 50 GeV superbeam. We find that the very long baselines of 2100 km and 3000 km are preferred for the neutrino factory according to the figure of merit criterion. Our results also show that, for a neutrino factory, lower primary muon energies such as 20 GeV are preferred rather than higher ones such as 30 or 50 GeV. For the superbeam, the combination of a long baseline such as 300 km and a very long baseline such as 2100 km will form a complete measurement of the oscillation parameters in addition to the (Formula presented) phase. To measure the (Formula presented) phase in a superbeam, a larger detector (a factor 3 beyond what is considered in this paper) and/or a higher intensity beam will be needed to put some significant constraints on the size of the (Formula presented) angle.

贻芳 王;Kerry Whisnant;Bing Lin Young

Physical Review D - Particles, Fields, Gravitation and Cosmology

2002

Based on a sample of 1.31×109 J/ψ events collected with the BESIII detector, the matrix elements for the decays η′→ηπ+π- and η′→ηπ0π0 are determined using 351,016 η′→(η→γγ)π+π- and 56,249 η′→(η→γγ)π0π0 events with background levels less than 1%. Two commonly used representations are used to describe the Dalitz plot density. We find that an assumption of a linear amplitude does not describe the data well. A small deviation of the obtained matrix elements between η′→ηπ+π- and η′→ηπ0π0 is probably caused by the mass difference between charged and neutral pions or radiative corrections. No cusp structure in η′→ηπ0π0 is observed.

M. Ablikim;M. N. Achasov;S. Ahmed;M. Albrecht;A. Amoroso;F. F. An;琪 安;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;浩 蔡;和生 陈;旭荣 陈;燎原 董;双世 房;立波 郭;性涛 黄;钢 李;海波 李;卫东 李;晓磊 李;觉平 刘;前 刘;翔 刘;加伦 平;建国 陈;肖雁 沈;洁琬 孙;昌建 唐;贻芳 王;志勇 汪;振军 肖;铭汉 叶;长征 苑;宏浩 张;尧 张;政国 赵;阳恒 郑;冰松 邹

Physical Review D

2018-1-1

Using 14M ψ(2S) events collected at BESII, the branching fraction of ψ(2S)→τ+τ- is measured to be Brττ=(3.08±0. 21±0.38)×10-3, where the first error is statistical and the second is systematic.

M. Ablikim;J. Z. Bai;Y. Ban;J. G. Bian;X. Cai;H. F. Chen;H. S. Chen;H. X. Chen;J. C. Chen;Jin Chen;Y. B. Chen;S. P. Chi;Y. P. Chu;X. Z. Cui;Y. S. Dai;L. Y. Diao;Z. Y. Deng;Q. F. Dong;S. X. Du;J. Fang;双世 房;C. D. Fu;C. S. Gao;Y. N. Gao;S. D. Gu;Y. T. Gu;Y. N. Guo;Y. Q. Guo;Z. J. Guo;F. A. Harris;K. L. He;M. He;Y. K. Heng;H. M. Hu;T. Hu;G. S. Huang;X. T. Huang;X. B. Ji;X. S. Jiang;X. Y. Jiang;J. B. Jiao;D. P. Jin;S. Jin;Yi Jin;Y. F. Lai;钢 李;海波 李;H. H. Li;J. Li;R. Y. Li;S. M. Li;W. D. Li;W. G. Li;X. L. Li;X. N. Li;X. Q. Li;Y. L. Li;Y. F. Liang;H. B. Liao;B. J. Liu;C. X. Liu;F. Liu;Fang Liu;H. H. Liu;H. M. Liu;J. Liu;J. B. Liu;觉平 刘;Q. Liu;R. G. Liu;Z. A. Liu;Y. C. Lou;F. Lu;G. R. Lu;J. G. Lu;C. L. Luo;凤才 马;H. L. Ma;L. L. Ma;Q. M. Ma;X. B. Ma;Z. P. Mao;X. H. Mo;J. Nie;S. L. Olsen;H. P. Peng;R. G. Ping;N. D. Qi;H. Qin;J. F. Qiu;Z. Y. Ren;建国 陈;L. Y. Shan;L. Shang;C. P. Shen;D. L. Shen;肖雁 沈;H. Y. Sheng;H. S. Sun;J. F. Sun;S. S. Sun;Y. Z. Sun;Z. J. Sun;Z. Q. Tan;X. Tang;G. L. Tong;G. S. Varner;D. Y. Wang;L. Wang;L. L. Wang;L. S. Wang;萌 王;平 王;P. L. Wang;W. F. Wang;贻芳 王;政 王;志勇 汪;Zhe Wang;Zheng Wang;C. L. Wei;D. H. Wei;N. Wu;X. M. Xia;X. X. Xie;G. F. Xu;X. P. Xu;Y. Xu;M. L. Yan;H. X. Yang;Y. X. Yang;铭汉 叶;Y. X. Ye;Z. Y. Yi;G. W. Yu;长征 苑;J. M. Yuan;Y. Yuan;S. L. Zang;Y. Zeng;Yu Zeng;B. X. Zhang;B. Y. Zhang;C. C. Zhang;D. H. Zhang;洪起 张;H. Y. Zhang;J. W. Zhang;J. Y. Zhang;S. H. Zhang;X. M. Zhang;X. Y. Zhang;Yiyun Zhang;Z. P. Zhang;D. X. Zhao;J. W. Zhao;M. G. Zhao;P. P. Zhao;W. R. Zhao;Z. G. Zhao;汉青 郑;J. P. Zheng;Z. P. Zheng;L. Zhou;N. F. Zhou;K. J. Zhu;Q. M. Zhu;Y. C. Zhu;Y. S. Zhu;Yingchun Zhu;Z. A. Zhu;B. A. Zhuang;X. A. Zhuang;冰松 邹

Physical Review D - Particles, Fields, Gravitation and Cosmology

2006

By analyzing the R values measured at 68 energy points in the energy region between 3.650 and 3.872 GeV reported in our previous paper, we have precisely measured the mass, the total width and the leptonic width of the ψ (3770) resonance to be M_{ψ (3770)} = 3772.4 ± 0.4 ± 0.3   MeV, Γ_{ψ (3770)}^tot = 28.5 ± 1.2 ± 0.2   MeV and Γ_{ψ (3770)}^{e e} = 277 ± 11 ± 13   eV, respectively. We have measured the leptonic branching fraction of the ψ (3770) decays and the ψ (3770) production cross section at its peak to be B [ψ (3770) → e⁺ e^-] = (0.97 ± 0.03 ± 0.05) × 10^-5 and σ^prd [e⁺ e^- → ψ (3770)] = 10.0 ± 0.3 ± 0.5  nb, respectively. The latter one results in the corresponding observed cross section of σ^obs [e⁺ e^- → ψ (3770)] = 7.2 ± 0.2 ± 0.4  nb. We have also measured R_uds = 2.121 ± 0.023 ± 0.084 for the continuum light hadron production in the region from 3.650 to 3.872 GeV.

M. Ablikim;J. Z. Bai;Y. Ban;J. G. Bian;X. Cai;H. F. Chen;H. S. Chen;H. X. Chen;J. C. Chen;Jin Chen;Y. B. Chen;S. P. Chi;Y. P. Chu;X. Z. Cui;Y. S. Dai;Z. Y. Deng;燎原 董;Q. F. Dong;S. X. Du;Z. Z. Du;J. Fang;双世 房;C. D. Fu;C. S. Gao;Y. N. Gao;S. D. Gu;Y. T. Gu;Y. N. Guo;Y. Q. Guo;K. L. He;M. He;Y. K. Heng;H. M. Hu;T. Hu;X. P. Huang;X. T. Huang;X. B. Ji;X. S. Jiang;J. B. Jiao;D. P. Jin;S. Jin;Yi Jin;Y. F. Lai;钢 李;海波 李;H. H. Li;J. Li;R. Y. Li;S. M. Li;卫东 李;W. G. Li;X. L. Li;X. Q. Li;Y. L. Li;Y. F. Liang;H. B. Liao;C. X. Liu;F. Liu;Fang Liu;H. H. Liu;H. M. Liu;J. Liu;J. B. Liu;觉平 刘;R. G. Liu;Z. A. Liu;F. Lu;G. R. Lu;H. J. Lu;J. G. Lu;C. L. Luo;凤才 马;H. L. Ma;L. L. Ma;Q. M. Ma;X. B. Ma;Z. P. Mao;X. H. Mo;J. Nie;H. P. Peng;N. D. Qi;H. Qin;J. F. Qiu;Z. Y. Ren;建国 陈;L. Y. Shan;L. Shang;D. L. Shen;肖雁 沈;H. Y. Sheng;F. Shi;X. Shi;H. S. Sun;J. F. Sun;S. S. Sun;Y. Z. Sun;Z. J. Sun;Z. Q. Tan;X. Tang;Y. R. Tian;G. L. Tong;D. Y. Wang;L. Wang;L. S. Wang;萌 王;平 王;P. L. Wang;W. F. Wang;贻芳 王;政 王;志勇 汪;Zhe Wang;Zheng Wang;C. L. Wei;D. H. Wei;N. Wu;X. M. Xia;X. X. Xie;B. Xin;G. F. Xu;Y. Xu;M. L. Yan;F. Yang;H. X. Yang;J. Yang;Y. X. Yang;铭汉 叶;Y. X. Ye;Z. Y. Yi;G. W. Yu;长征 苑;J. M. Yuan;Y. Yuan;S. L. Zang;Y. Zeng;Yu Zeng;B. X. Zhang;B. Y. Zhang;C. C. Zhang;D. H. Zhang;H. Y. Zhang;J. W. Zhang;J. Y. Zhang;Q. J. Zhang;X. M. Zhang;X. Y. Zhang;Yiyun Zhang;Z. P. Zhang;晴 张;D. X. Zhao;J. W. Zhao;M. G. Zhao;P. P. Zhao;W. R. Zhao;汉青 郑;J. P. Zheng;Z. P. Zheng;L. Zhou;N. F. Zhou;K. J. Zhu;Q. M. Zhu;Y. C. Zhu;Y. S. Zhu;Yingchun Zhu;Z. A. Zhu;B. A. Zhuang;X. A. Zhuang;冰松 邹

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

2007-9-6

Based on a sample of 1.31×109 J/ψ events collected with the BESIII detector at the BEPCII collider, Dalitz plot analyses of selected 79,625 η→π+π-π0 events, 33,908 η→π0π0π0 events, and 1,888 η′→π0π0π0 events are performed. The measured matrix elements of η→π+π-π0 are in reasonable agreement with previous measurements. The Dalitz plot slope parameters of η→π0π0π0 and η′→π0π0π0 are determined to be -0.055±0.014±0.004 and -0.640±0.046±0.047, respectively, where the first uncertainties are statistical and the second systematic. Both values are consistent with previous measurements, while the precision of the latter one is improved by a factor of 3. Final state interactions are found to have an important role in those decays.

M. Ablikim;M. N. Achasov;X. C. Ai;O. Albayrak;M. Albrecht;D. J. Ambrose;A. Amoroso;F. F. An;琪 安;J. Z. Bai;R. Baldini Ferroli;Y. Ban;D. W. Bennett;J. V. Bennett;M. Bertani;D. Bettoni;J. M. Bian;F. Bianchi;E. Boger;I. Boyko;R. A. Briere;浩 蔡;X. Cai;和生 陈;旭荣 陈;燎原 董;双世 房;立波 郭;性涛 黄;钢 李;海波 李;卫东 李;晓磊 李;觉平 刘;前 刘;翔 刘;凤才 马;加伦 平;建国 陈;肖雁 沈;洁琬 孙;昌建 唐;贻芳 王;振军 肖;铭汉 叶;长征 苑;宏浩 张;政国 赵;阳恒 郑;冰松 邹

Physical Review D - Particles, Fields, Gravitation and Cosmology

2015-7-31

Using a sample of 58 million J/ψ events collected with the BESII detector at the BEPC, more than 100000 J/ψ→pp̄π0 events are selected, and a detailed partial wave analysis is performed. The branching fraction is determined to be Br(J/ψ→pp̄π0)=(1.33±0. 02±0.11)×10-3. A long-sought missing N*, first observed in J/ψ→pn̄π-, is observed in this decay too, with mass and width of 2040-4+3±25 MeV/c2 and 230-8+8±52 MeV/c2, respectively. Its spin-parity favors 32+. The masses, widths, and spin parities of other N* states are obtained as well.

M. Ablikim;J. Z. Bai;Y. Bai;Y. Ban;X. Cai;H. F. Chen;H. S. Chen;H. X. Chen;J. C. Chen;Jin Chen;X. D. Chen;Y. B. Chen;Y. P. Chu;Y. S. Dai;Z. Y. Deng;S. X. Du;J. Fang;C. D. Fu;C. S. Gao;Y. N. Gao;S. D. Gu;Y. T. Gu;Y. N. Guo;Z. J. Guo;F. A. Harris;K. L. He;M. He;Y. K. Heng;H. M. Hu;T. Hu;G. S. Huang;X. T. Huang;Y. P. Huang;X. B. Ji;X. S. Jiang;J. B. Jiao;D. P. Jin;S. Jin;钢 李;海波 李;J. Li;L. Li;R. Y. Li;S. M. Li;W. D. Li;W. G. Li;X. L. Li;X. N. Li;X. Q. Li;Y. F. Liang;B. J. Liu;C. X. Liu;Fang Liu;Feng Liu;H. M. Liu;觉平 刘;H. B. Liu;J. Liu;Q. Liu;R. G. Liu;S. Liu;Z. A. Liu;F. Lu;G. R. Lu;J. G. Lu;C. L. Luo;凤才 马;H. L. Ma;Q. M. Ma;M. Q.A. Malik;Z. P. Mao;X. H. Mo;J. Nie;S. L. Olsen;R. G. Ping;N. D. Qi;J. F. Qiu;建国 陈;X. D. Ruan;L. Y. Shan;L. Shang;C. P. Shen;肖雁 沈;H. Y. Sheng;H. S. Sun;S. S. Sun;Y. Z. Sun;Z. J. Sun;X. Tang;J. P. Tian;G. L. Tong;G. S. Varner;X. Wan;J. X. Wang;L. Wang;L. L. Wang;L. S. Wang;P. Wang;P. L. Wang;贻芳 王;政 王;志勇 汪;C. L. Wei;D. H. Wei;N. Wu;X. M. Xia;G. F. Xu;X. P. Xu;Y. Xu;M. L. Yan;H. X. Yang;敏 杨;Y. X. Yang;铭汉 叶;Y. X. Ye;C. X. Yu;长征 苑;Y. Yuan;Y. Zeng;B. X. Zhang;B. Y. Zhang;C. C. Zhang;D. H. Zhang;F. Zhang;洪起 张;H. Y. Zhang;J. W. Zhang;J. Y. Zhang;X. Y. Zhang;Y. Y. Zhang;Z. X. Zhang;Z. P. Zhang;D. X. Zhao;J. W. Zhao;M. G. Zhao;P. P. Zhao;政国 赵;B. Zheng;汉青 郑;J. P. Zheng;Z. P. Zheng;B. Zhong;L. Zhou;K. J. Zhu;Q. M. Zhu;X. W. Zhu;Y. S. Zhu;Z. A. Zhu;Z. L. Zhu;B. A. Zhuang;冰松 邹

Physical Review D - Particles, Fields, Gravitation and Cosmology

2009-9-17

We measured the branching fractions of the decays χcJ→ς-ς¯+ for the first time using the final states nn¯π+π-. The data sample exploited here is 448.1×106 ψ(3686) events collected with BESIII. We find B(χcJ→ς-ς¯+)=(51.3±2.4±4.1)×10-5,(5.7±1.4±0.6)×10-5, and (4.4±1.7±0.5)×10-5, for J=0, 1, 2, respectively, where the first uncertainties are statistical and the second systematic.

M. Ablikim;M. N. Achasov;P. Adlarson;S. Ahmed;M. Albrecht;A. Amoroso;Q. An; Anita;Y. Bai;O. Bakina;R. Baldini Ferroli;I. Balossino;Y. Ban;K. Begzsuren;J. V. Bennett;N. Berger;M. Bertani;D. Bettoni;F. Bianchi;J. Biernat;J. Bloms;A. Bortone;I. Boyko;R. A. Briere;旭荣 陈;燎原 董;双世 房;立波 郭;性涛 黄;钢 李;海波 李;卫东 李;晓磊 李;前 刘;翔 刘;加伦 平;建国 陈;肖雁 沈;洁琬 孙;昌建 唐;贻芳 王;志勇 汪;振军 肖;铭汉 叶;长征 苑;宏浩 张;尧 张;政国 赵;阳恒 郑;冰松 邹

Physical Review D

2020-5-1