Our collaboration has installed a long baseline neutrino oscillation experiment at the Palo Verde Nuclear Generating Station in Arizona. 12 tons of Gd loaded liquid scintillator, in a segmented detector, are used to search for v̄_e ↔ v̄_x oscillations at 740 m distance to three reactors. The anti-neutrino capture on the proton serves as detection reaction. The experiment is expected to reach a sensitivity of Δm² > 1.3 · 10^-3 eV² and sin²2Θ > 0.1. Our range of sensitivity is tuned to test the vμ ↔ v_e solution of the atmospheric neutrino anomaly.

F. Boehm;J. Busenitz;J. Cornis;M. Dugger;G. Gratta;J. Hanson;H. Henrikson;D. Lawrence;D. Michael;L. Miller;V. M. Novikov;A. Piepke;S. Pittalwala;B. Ritchie;D. Tracy;A. Vital;J. P. Vogel;贻芳 王;R. Wilferd;J. Wolf;S. Young

Nuclear Physics B - Proceedings Supplements

1999-1

Using χcJ→2(π+π-)pp̄ decays from 14×106ψ(2S) events accumulated by the BESII detector at the BEPC, the intermediate states Ξ-Ξ̄+, ΛΛ̄π+π-, and KS0KS0pp̄ are studied, and their branching ratios or upper limits are measured.

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;Z. Wang;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

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;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;平 孙;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

2020-9

Using 58×106 J/ψ and 14×106 ψ(2S) events collected by the BESII detector at the BEPC, branching fractions or upper limits for the decays J/ψ and ψ(2S)→ΛΛ̄π0 and ΛΛ̄η are measured. For the isospin violating decays, the upper limits are determined to be B(J/ψ→ΛΛ̄π0) <6.4×10-5 and B[ψ(2S)→ΛΛ̄π0]<4. 9×10-5 at the 90% confidence level. The isospin conserving process J/ψ→ΛΛ̄η is observed for the first time, and its branching fraction is measured to be B(J/ ψ→ΛΛ̄η)=(2.62±0.60±0.44) ×10-4, where the first error is statistical and the second one is systematic. No ΛΛ̄η signal is observed in ψ(2S) decays, and B[ψ(2S)→ΛΛ̄η]<1.2×10-4 is set at the 90% confidence level. Branching fractions of J/ψ decays into Σ+π-Λ̄ and Σ̄-π+Λ are also reported, and the sum of these branching fractions is determined to be B(J/ψ→Σ+π-Λ̄+c.c.)=(1.52±0.08±0.16) ×10-3.

M. Ablikim;J. Z. Bai;Y. Ban;X. Cai;H. F. Chen;H. S. Chen;H. X. Chen;J. C. Chen;Jin Chen;Y. B. Chen;Y. P. Chu;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;Z. J. Guo;F. A. Harris;K. L. He;M. He;Y. K. Heng;J. Hou;H. M. Hu;J. H. 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;Y. F. Lai;钢 李;海波 李;J. Li;R. Y. Li;S. M. Li;卫东 李;W. G. Li;X. L. Li;X. N. Li;X. Q. 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;Jian Liu;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;Z. P. Mao;X. H. Mo;J. Nie;S. L. Olsen;R. G. Ping;N. D. Qi;H. Qin;J. F. Qiu;Z. Y. Ren;建国 陈;X. D. Ruan;L. Y. Shan;L. Shang;C. P. Shen;D. L. Shen;肖雁 沈;H. Y. Sheng;H. S. Sun;S. S. Sun;Y. Z. Sun;Z. J. Sun;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;志勇 汪;政 王;C. L. Wei;D. H. Wei;Y. Weng;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;G. W. Yu;长征 苑;Y. Yuan;S. L. Zang;Y. 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. Y. Zhang;Yiyun Zhang;Z. X. 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;K. J. Zhu;Q. M. Zhu;Y. C. Zhu;Y. S. Zhu;Z. A. Zhu;B. A. Zhuang;X. A. Zhuang;冰松 邹

Physical Review D - Particles, Fields, Gravitation and Cosmology

2007-11-13

By analyzing 2.93 fb-1 of e+e- annihilation data taken at the center-of-mass energy s=3.773 GeV with the BESIII detector, we determine the branching fractions of the inclusive decays D+→φX and D0→φX to be (1.135±0.034±0.031)% and (1.091±0.027±0.035)%, respectively, where X denotes any possible particle combination. The first uncertainties are statistical, and the second are systematic. We also determine the branching fractions of the decays D→φX and their charge conjugate modes D→φX separately for the first time, and no significant CP asymmetry is observed.

M. Ablikim;M. N. Achasov;P. Adlarson;S. Ahmed;M. Albrecht;M. Alekseev;A. Amoroso;F. F. An;琪 安;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;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

Physical Review D

2019-10-15

The online Data Quality Monitoring (DQM) tool plays an important role in the data recording process of HEP experiments. The BESIII DQM collects data from the online data flow, reconstructs them with offline reconstruction software and automatically analyzes the reconstructed data with user-defined algorithms. The DQM software is a scalable distributed system. The monitored results are gathered and displayed in various formats, which provides the shifter with current run information that can be used to identify problems quickly. This paper gives an overview of the DQM system at BESIII.

Xiao Dong Sun;Ji Feng Hu;Hai Sheng Zhao;Xiao Bin Ji;贻芳 王;阳恒 郑;Bei Jiang Liu

Chinese Physics C

2012-7

Recent results of non-accelerator-based experiments, including those of solar, atmospheric, and reactor neutrinos oscillations, neutrinoless double-beta decays, and neutrino magnetic moments, are reviewed. Future projects and their respective prospects are summarized.

贻芳 王

International Journal of Modern Physics A

2005-9-10

We have set up a light scattering spectrometer to study the depolarization of light scattering in linear alkylbenzene. The scattering spectra show that the depolarized part of light scattering is due to Rayleigh scattering. The additional depolarized Rayleigh scattering can make the effective transparency of linear alkylbenzene much better than expected. Therefore, sufficient scintillation photons can transmit through large liquid scintillator detector, such as that of the JUNO experiment. Our study is crucial to achieving an unprecedented energy resolution of 3 (Formula presented.) required for the JUNO experiment to determine the neutrino mass hierarchy. The spectroscopic method can also be used to examine the depolarization of other organic solvents used in neutrino experiments.

Xiang Zhou;前 刘;Junbo Han;Zhenyu Zhang;Xuan Zhang;Yayun Ding;阳恒 郑;Li Zhou;俊 曹;贻芳 王

European Physical Journal C

2015-11-1

Crucial inputs for a variety of CP-violation studies can be determined through the analysis of pairs of quantum-entangled neutral D mesons, which are produced in the decay of the ψ(3770) resonance. The relative strong-phase parameters between D0 and D¯0 in the decays D0→KS,L0π+π- are studied using 2.93 fb-1 of e+e- annihilation data delivered by the BEPCII collider and collected by the BESIII detector at a center-of-mass energy of 3.773 GeV. Results are presented in regions of the phase space of the decay. These are the most precise measurements to date of the strong-phase parameters in D→KS,L0π+π- decays. Using these parameters, the associated uncertainty on the Cabibbo-Kobayashi-Maskawa angle γ/φ3 is expected to be between 0.7° and 1.2° for an analysis using the decay B±→DK±, D→KS0π+π-, where D represents a superposition of D0 and D¯0 states. This is a factor of 3 smaller than that achievable with previous measurements. Furthermore, these results provide valuable input for charm-mixing studies, other measurements of CP violation, and the measurement of strong-phase parameters for other D-decay modes.

M. Ablikim;M. N. Achasov;P. Adlarson;S. Ahmed;M. Albrecht;M. Alekseev;D. Ambrose;A. Amoroso;F. F. An;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;燎原 董;双世 房;原宁 高;立波 郭;性涛 黄;钢 李;海波 李;卫东 李;晓磊 李;前 刘;翔 刘;凤才 马;加伦 平;建国 陈;肖雁 沈;平 孙;洁琬 孙;昌建 唐;贻芳 王;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

2020-6-1

The process e+e-→ΛΛ is studied using data samples at s=2.2324, 2.400, 2.800 and 3.080 GeV collected with the BESIII detector operating at the BEPCII collider. The Born cross section is measured at s=2.2324 GeV, which is 1.0 MeV above the ΛΛ mass threshold, to be 305±45-36+66 pb, where the first uncertainty is statistical and the second systematic. The cross section near threshold is larger than that expected from theory, which predicts the cross section to vanish at threshold. The Born cross sections at s=2.400, 2.800 and 3.080 GeV are measured and found to be consistent with previous experimental results, but with improved precision. Finally, the corresponding effective electromagnetic form factors of Λ are deduced.

M. Ablikim;M. N. Achasov;S. Ahmed;X. C. Ai;O. AlbayraK;M. Albrecht;D. J. Ambrose;A. Amoroso;F. F. An;琪 安;J. Z. 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;浩 蔡;X. Cai;O. Cakir;A. Calcaterra;G. F. Cao;S. A. Cetin;J. Chai;J. F. Chang;G. Chelkov;G. Chen;和生 陈;J. C. Chen;M. L. Chen;S. Chen;S. J. Chen;X. Chen;旭荣 陈;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;燎原 董;M. Y. Dong;Z. L. Dou;S. X. Du;P. F. Duan;J. Z. Fan;J. Fang;双世 房;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;Z. Gao;I. Garzia;K. Goetzen;L. Gong;W. X. Gong;W. Gradl;M. Greco;M. H. Gu;Y. T. Gu;Y. H. Guan;A. Q. Guo;立波 郭;R. P. Guo;Y. Guo;Y. P. Guo;Z. Haddadi;A. Hafner;S. Han;X. Q. Hao;F. A. Harris;K. L. 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;性涛 黄;X. Z. Huang;Z. L. Huang;T. Hussain;W. Ikegami Andersson;Q. Ji;Q. P. Ji;X. B. Ji;X. L. Ji;L. W. Jiang;X. S. Jiang;X. Y. Jiang;J. B. Jiao;Z. Jiao;D. P. Jin;S. Jin;T. Johansson;A. Julin;N. Kalantar-Nayestanaki;X. L. Kang;X. S. Kang;M. KavatsyuK;B. C. Ke;P. Kiese;R. Kliemt;B. Kloss;O. B. Kolcu;B. Kopf;M. Kornicer;A. Kupsc;W. Kühn;J. S. Lange;M. Lara;P. Larin;H. Leithoff;C. Leng;C. Li;Cheng Li;D. M. Li;F. Li;F. Y. Li;钢 李;海波 李;H. J. Li;J. C. Li;Jin Li;K. Li;K. Li;Lei Li;P. L. Li;P. R. Li;Q. Y. Li;T. Li;卫东 李;W. G. Li;晓磊 李;X. N. Li;X. Q. Li;Y. B. 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. Liu;J. B. Liu;觉平 刘;J. Y. Liu;K. Liu;K. Y. Liu;L. D. Liu;P. L. Liu;前 刘;S. B. Liu;翔 刘;Y. B. Liu;Y. Y. Liu;Z. A. Liu;Zhiqing Liu;H. Loehner;Y. F. Long;X. C. Lou;H. J. Lu;J. G. Lu;Y. Lu;Y. P. Lu;C. L. Luo;M. X. Luo;T. 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;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;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;M. PapenbrocK;P. Patteri;M. Pelizaeus;H. P. Peng;K. Peters;J. Pettersson;加伦 平;R. G. Ping;R. Poling;V. Prasad;H. R. Qi;M. Qi;S. Qian;C. F. Qiao;L. Q. Qin;N. Qin;X. S. Qin;Z. H. Qin;J. F. Qiu;K. H. Rashid;C. F. Redmer;M. Ripka;建国 陈;Ch Rosner;X. D. Ruan;A. Sarantsev;M. Savrié;C. Schnier;K. Schoenning;W. Shan;M. Shao;C. P. Shen;P. X. Shen;肖雁 沈;H. Y. Sheng;W. M. Song;X. Y. Song;S. Sosio;S. Spataro;G. X. Sun;J. F. Sun;S. S. Sun;X. H. Sun;洁琬 孙;Y. Z. Sun;Z. J. Sun;Z. T. Sun;昌建 唐;X. Tang;I. Tapan;E. H. Thorndike;M. Tiemens;I. Uman;G. S. Varner;B. Wang;B. L. Wang;D. Wang;D. Y. Wang;K. Wang;L. L. Wang;L. S. Wang;M. Wang;P. Wang;P. L. Wang;W. Wang;W. P. Wang;X. F. Wang;Y. Wang;Y. D. Wang;贻芳 王;Y. Q. Wang;Z. Wang;Z. G. Wang;Z. H. Wang;志勇 汪;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;L. G. Xia;Y. Xia;D. Xiao;H. Xiao;振军 肖;Y. G. Xie;Y. H. Xie;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. X. 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;Z. Zeng;B. X. Zhang;B. Y. Zhang;C. C. Zhang;D. H. Zhang;宏浩 张;H. Y. Zhang;J. Zhang;J. 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;尧 张;Y. H. Zhang;Y. N. 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;Q. W. Zhao;S. J. Zhao;T. C. Zhao;Y. B. Zhao;政国 赵;A. Zhemchugov;B. Zheng;J. P. Zheng;W. J. Zheng;阳恒 郑;B. Zhong;L. Zhou;X. Zhou;X. K. Zhou;X. R. Zhou;X. Y. Zhou;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;冰松 邹;J. H. Zou

Physical Review D

2018-2-1