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351. Note: Upgrade of electron cyclotron emission imaging system and preliminary results on HL-2A tokamak

Author: Wei Chen, Y. Xu, Xuantong Ding, Min Jiang, Qingwei Yang, Yong Liu, Wulyu Zhong, B. Z. Fu, B. Y. Zhang, P. W. Shi, Calvin Domier, Z. B. Shi, Z. T. Liu, Z.C. Yang, and Neville C. Luhmann
Subjects: Physics, Tokamak, business.industry, Local oscillator, Resolution (electron density), Cyclotron, Field of view, law.invention, Optics, law, Temporal resolution, Plasma diagnostics, Atomic physics, business, Instrumentation, Image resolution
Abstract: The electron cyclotron emission imaging system on the HL-2A tokamak has been upgraded to 24 (poloidally) × 16 (radially) channels based on the previous 24 × 8 array. The measurement region can be flexibly shifted due to the independence of the two local oscillator sources, and the field of view can be adjusted easily by changing the position of the zoom lenses. The temporal resolution is about 2.5 μs and the achievable spatial resolution is 1 cm. After laboratory calibration, it was installed on HL-2A tokamak in 2014, and the local 2D mode structures of MHD activities were obtained for the first time.
Published: 2015

352. Measurements of the ContinuumRudsandRValues ine+e−Annihilation in the Energy Region between 3.650 and 3.872 GeV

Author: X. S. Jiang, Y. P. Chu, Z. Y. Wang, X. B. Ji, Z. Z. Du, Y. C. Zhu, Yingchun Zhu, P. L. Wang, H. B. Li, Qiyang Zhang, N. Wu, J. W. Zhao, Z. Y. Yi, W. R. Zhao, F. Liu, G. W. Yu, C. L. Luo, Houbing Lu, Y. N. Gao, Z. P. Zhang, C. C. Zhang, F. C. Ma, Z. Y. Zhang, R. Y. Li, Y. Li, Fang Liu, Han-Qing Zheng, Cunfeng Wei, H. L. Ma, S. M. Li, Fan Yang, D. X. Zhao, B. Y. Zhang, Miao He, Q. F. Dong, Ning Zhou, P. Wang, J. W. Zhang, Hangxu Li, J. F. Qiu, Y. Zeng, Feng Shi, Xingzhu Cui, Y. Q. Guo, S. S. Sun, L. P. Zhou, Bo Xin, Y. X. Yang, H. M. Hu, Z. P. Mao, Y. T. Gu, X. Y. Zhang, Y. B. Chen, Z. J. Sun, R. G. Liu, W. D. Li, H. Y. Sheng, J. G. Lu, Y. Z. Sun, X. M. Xia, Y. F. Lai, H. H. Liu, J. C. Li, H. F. Chen, W. F. Wang, W. G. Li, J. B. Liu, J. Nie, T. Hu, XZ（蔡翔舟） Cai, Z. Q. Tan, S. D. Gu, D. Y. Wang, X. L. Li, N. D. Qi, X. B. Ma, Xuai Zhuang, Y. S. Dai, Yi Jin, C. S. Gao, S. P. Chi, Jinxing Zheng, H. M. Liu, L. L. Ma, Z. A. Liu, Lianyou Shan, Yu Zeng, D. H. Wei, G. F. Xu, S. Jin, J. P. Liu, Huirun Chen, J. B. Jiao, F. Lu, X. Y. Shen, H. X. Yang, Y. Ban, H. S. Chen, P. P. Zhao, Q. M. Zhu, Y. C. Xu, Y. N. Guo, M. Z. Wang, K. J. Zhu, J. M. Yuan, H. S. Sun, Yudan Wang, Haiping Peng, X. T. Huang, X. H. Mo, L. S. Wang, G. R. Lu, S. L. Zang, B. X. Zhang, G. Rong, D. L. Shen, Z. Y. Ren, C. X. Liu, M. H. Ye, X. Tang, J. Z. Bai, K. L. He, Z. P. Zheng, Z. A. Zhu, Shang Lunlin, Hongbo Liao, J. G. Bian, Y. F. Liang, G. Li, Zujian Wang, D. P. Jin, Xiru Huang, Yiyun Zhang, C. Z. Yuan, Zheng Wang, C. D. Fu, Z. Y. Deng, Zhe Wang, G. L. Tong, M. Ablikim, B. A. Zhuang, Q. M. Ma, Y. X. Ye, D. H. Zhang, L. Y. Dong, B.S. Zou, Jianwei Sun, Jiming Yang, Y. Yuan, Y. S. Zhu, Yang Tian, J. C. Chen, S. X. Du, M. L. Yan, J. Fang, H. Y. Zhang, J. Y. Zhang, Y. K. Heng, Xunchao Zhang, M. G. Zhao, X. Shi, X. Q. Li, H. Qin, Jin Chen, S. S. Fang, and X. X. Xie
Subjects: Physics, Particle physics, Annihilation, Electron–positron annihilation, Hadron, General Physics and Astronomy, Astrophysics::Cosmology and Extragalactic Astrophysics, law.invention, Nuclear physics, Positron, law, High Energy Physics::Experiment, Production (computer science), Continuum (set theory), Collider, Energy (signal processing)
Abstract: We report measurements of the continuum R{sub uds} near the center-of-mass energy of 3.70 GeV, the R{sub uds(c)+{psi}}{sub (3770)}(s) and the R{sub had}(s) values in e{sup +}e{sup -} annihilation at 68 energy points in the energy region between 3.650 and 3.872 GeV with the BES-II detector at the BEPC Collider. We obtain the R{sub uds} for the continuum light hadron (containing u, d, and s quarks) production near the DD threshold to be R{sub uds}=2.141{+-}0.025{+-}0.085.
Published: 2006

353. Improved measurement ofψ(2S)decays intoτ+τ−

Author: 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, S. S. Fang, 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, H. B. Li, 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, J. P. Liu, Q. Liu, R. G. Liu, Z. A. Liu, Y. C. Lou, F. Lu, G. R. Lu, J. G. Lu, C. L. Luo, F. C. Ma, 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, G. Rong, L. Y. Shan, L. Shang, C. P. Shen, D. L. Shen, X. Y. Shen, 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, M. Wang, P. Wang, P. L. Wang, W. F. Wang, Y. F. Wang, 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, M. H. Ye, Y. X. Ye, Z. Y. Yi, G. W. Yu, C. Z. Yuan, 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. Q. Zhang, 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, H. Q. Zheng, 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, and B. S. Zou
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle decay, Branching fraction, High Energy Physics::Experiment, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Galaxy Astrophysics, Particle identification
Abstract: Using 14M psi(2S) events collected at BESII, the branching fraction of psi(2S)->tau(+)tau(-) is measured to be Br-tau tau=(3.08 +/- 0.21 +/- 0.38)x10(-3), where the first error is statistical and the second is systematic.
Published: 2006

354. Search for Invisible Decays ofηandη′inJ/ψ→ϕηandϕη′

Author: T. Hu, Y. T. Gu, XZ（蔡翔舟） Cai, X. L. Li, B. J. Liu, Yudan Wang, Xingzhu Cui, G. R. Lu, D. H. Wei, Z. A. Zhu, Huirun Chen, Lianyou Shan, F. Lu, Q. Liu, X. X. Xie, X. H. Mo, L. S. Wang, M. H. Ye, L. L. Wang, S. D. Gu, C. P. Shen, S. L. Olsen, Xunchao Zhang, Y. X. Yang, S. S. Sun, Y. P. Chu, Z. Y. Wang, Yingchun Zhu, L. L. Ma, Z. A. Liu, X. P. Xu, X. B. Ji, C. Z. Yuan, Y. Ban, G. S. Varner, Z. Y. Yi, Y. Z. Sun, N. Wu, Zhe Wang, M. G. Zhao, J. Z. Bai, Shang Lunlin, X. Y. Zhang, G. Li, H. Q. Zhang, J. G. Bian, Y. Li, Y. N. Guo, H. Y. Zhang, Jin Chen, Fang Liu, S. S. Fang, H. Y. Sheng, Z. Q. Tan, R. G. Liu, C. D. Fu, J. B. Liu, S. H. Zhang, X. Y. Shen, N. D. Qi, Z. Y. Deng, J. W. Zhao, G. S. Huang, R. G. Ping, P. Wang, B. X. Zhang, X. Tang, X. Q. Li, G. W. Yu, W. R. Zhao, F. Liu, R. Y. Li, Hongbo Liao, D. X. Zhao, Yu Zeng, Han-Qing Zheng, J. Y. Zhang, B. Y. Zhang, Y. N. Gao, Hangxu Li, Y. C. Lou, S. P. Chi, Yiyun Zhang, Cunfeng Wei, P. P. Zhao, Zujian Wang, H. S. Chen, Q. F. Dong, Ning Zhou, H. M. Hu, J. W. Zhang, K. J. Zhu, J. M. Yuan, L. Y. Diao, Y. X. Ye, Q. M. Ma, H. Qin, Z. P. Zheng, Y. K. Heng, Zheng Wang, Y. Yuan, Y. S. Zhu, X. S. Jiang, Z. J. Guo, Y. Zeng, H. L. Ma, S. M. Li, W. D. Li, Y. Q. Guo, J. C. Chen, K. L. He, G. L. Tong, M. Ablikim, B. A. Zhuang, X. Y. Jiang, S. X. Du, Y. B. Chen, M. L. Yan, Jianwei Sun, J. Fang, Y. F. Lai, J. B. Jiao, H. F. Chen, W. F. Wang, B.S. Zou, Z. G. Zhao, Y. F. Liang, D. P. Jin, Z. J. Sun, H. H. Liu, J. C. Li, W. G. Li, D. Y. Wang, D. H. Zhang, H. M. Liu, H. B. Li, C. L. Luo, H. X. Yang, C. C. Zhang, G. F. Xu, S. Jin, J. P. Liu, D. L. Shen, C. X. Liu, J. Nie, Z. Y. Ren, X. B. Ma, Xuai Zhuang, X. M. Xia, Y. S. Dai, C. S. Gao, Jinxing Zheng, Q. M. Zhu, Y. C. Xu, M. Z. Wang, Miao He, H. S. Sun, X. N. Li, L. P. Zhou, X. T. Huang, Haiping Peng, G. Rong, Yi Jin, Z. P. Mao, Y. C. Zhu, P. L. Wang, F. A. Harris, S. L. Zang, Z. P. Zhang, F. C. Ma, J. F. Qiu, and J. G. Lu
Subjects: Physics, Particle physics, General Physics and Astronomy, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Using a data sample of $58\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $J/\ensuremath{\psi}$ decays collected with the Beijing Spectrometer II detector at the Beijing Electron Positron Collider, searches for invisible decays of $\ensuremath{\eta}$ and ${\ensuremath{\eta}}^{\ensuremath{'}}$ in $J/\ensuremath{\psi}$ to $\ensuremath{\phi}\ensuremath{\eta}$ and $\ensuremath{\phi}{\ensuremath{\eta}}^{\ensuremath{'}}$ are performed. The $\ensuremath{\phi}$ signals, which are reconstructed in ${K}^{+}{K}^{\ensuremath{-}}$ final states, are used to tag the $\ensuremath{\eta}$ and ${\ensuremath{\eta}}^{\ensuremath{'}}$ decays. No signals are found for the invisible decays of either $\ensuremath{\eta}$ or ${\ensuremath{\eta}}^{\ensuremath{'}}$, and upper limits at the 90% confidence level are determined to be $1.65\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ for the ratio $\frac{B(\ensuremath{\eta}\ensuremath{\rightarrow}\mathrm{invisible})}{B(\ensuremath{\eta}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma})}$ and $6.69\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2}$ for $\frac{B({\ensuremath{\eta}}^{\ensuremath{'}}\ensuremath{\rightarrow}\mathrm{invisible})}{B({\ensuremath{\eta}}^{\ensuremath{'}}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma})}$. These are the first searches for $\ensuremath{\eta}$ and ${\ensuremath{\eta}}^{\ensuremath{'}}$ decays into invisible final states.
Published: 2006

355. [Research on development of gold immunochromagraphic assay test kit for serum Coxsackievirus IgM antibody.]

Author: B Y, Zhang, X D, Cui, X H, Ma, T, Zhang, and S S, Hu
Subjects: Immunoglobulin M, Humans, Enzyme-Linked Immunosorbent Assay, Gold, Gold Colloid, Sensitivity and Specificity, Chromatography, Affinity
Abstract: To develop gold immunochromatographic assay (GICA) test kit for serum Coxsackievirus IgM antibody and optimize the key experiment conditions.Colloidal gold particles of 20 nm were prepared and coupled with sheep anti-human IgM, the gold immunochromatography assay test kit was setup for serum Coxsackievirus IgM antibody.The spheroidal colloid gold particles of 20 nm showed bright red in color. The minimal stable concentration (MSC) of gold sheep anti-human IgM was 1 ug/ml, and the suitable stable concentration (SSC) was 1.5 ug/ml. The pH 8.2 was appropriate; 30 sera samples were tested by GICA and ELISA, there was no significant difference between the two methods.The quality of gold immunochromatography assay test kit is associated with such factors as the quality and quantity of antigen or antibody, colloid gold particles, buffers, etc.
Published: 2006

356. Observation of a Broad1--Resonant Structure around1.5 GeV/c2in theK+K−Mass Spectrum inJ/ψ→K+K−π0

Author: 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, S. P. Chi, Y. P. Chu, X. Z. Cui, Y. S. Dai, Z. Y. Deng, L. Y. Dong, Q. F. Dong, S. X. Du, Z. Z. Du, J. Fang, S. S. Fang, 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. P. Huang, X. T. Huang, X. B. Ji, X. S. Jiang, J. B. Jiao, D. P. Jin, S. Jin, Yi Jin, Y. F. Lai, G. Li, H. B. Li, H. H. Li, J. Li, R. Y. Li, S. M. Li, W. D. Li, 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, J. P. Liu, R. G. Liu, Z. A. Liu, F. Lu, G. R. Lu, H. J. Lu, J. G. Lu, C. L. Luo, F. C. Ma, 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, N. D. Qi, H. Qin, J. F. Qiu, Z. Y. Ren, G. Rong, L. Y. Shan, L. Shang, D. L. Shen, X. Y. Shen, 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, G. S. Varner, D. Y. Wang, L. Wang, L. S. Wang, M. Wang, P. Wang, P. L. Wang, W. F. Wang, Y. F. Wang, Z. Wang, Z. Y. Wang, 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, M. H. Ye, Y. X. Ye, Z. Y. Yi, G. W. Yu, C. Z. Yuan, 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, Y. Y. Zhang, Z. P. Zhang, Z. Q. Zhang, D. X. Zhao, J. W. Zhao, M. G. Zhao, P. P. Zhao, W. R. Zhao, Z. G. Zhao, H. Q. Zheng, J. P. Zheng, Z. P. Zheng, L. Zhou, N. F. Zhou, K. J. Zhu, Q. M. Zhu, Y. C. Zhu, Yingchun Zhu, Y. S. Zhu, Z. A. Zhu, B. A. Zhuang, X. A. Zhuang, and B. S. Zou
Subjects: Physics, Meson, Partial wave analysis, Hadron, Analytical chemistry, General Physics and Astronomy, Resonance, Quarkonium, Nuclear physics, Particle decay, Pair production, Mass spectrum, High Energy Physics::Experiment, Nuclear Experiment
Abstract: A broad peak is observed at low K+K- invariant mass in J/psi -> K+K- pi(0) decays found in a sample of 5.8 x 10(7) J/psi events collected with the BESII detector. The statistical significance of the broad resonance is much larger than 5 sigma. A partial wave analysis shows that the J(PC) of this structure is 1(--). Its pole position is determined to be [1576(-55)(+49)(stat)(-91)(+98)(syst)] MeV/c(2)-i/2[818(-23)(+22)(stat)(-133)(+64)(syst)] MeV/c(2). These parameters are not compatible with any known meson resonances.
Published: 2006

357. Measurements of the continuum R(uds) and R values in e(+)e(-) annihilation in the energy region between 3.650 and 3.872 GeV

Author: 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, L Y, Dong, Q F, Dong, S X, Du, Z Z, Du, J, Fang, S S, Fang, 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, G, Li, H B, Li, H H, Li, J, Li, R Y, Li, S M, Li, W D, Li, 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, J P, Liu, R G, Liu, Z A, Liu, F, Lu, G R, Lu, H J, Lu, J G, Lu, C L, Luo, F C, Ma, 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, G, Rong, L Y, Shan, L, Shang, D L, Shen, X Y, Shen, 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, M, Wang, P, Wang, P L, Wang, W F, Wang, Y F, Wang, Z, Wang, Z Y, Wang, 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, M H, Ye, Y X, Ye, Z Y, Yi, G W, Yu, C Z, Yuan, 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, Z Q, Zhang, D X, Zhao, J W, Zhao, M G, Zhao, P P, Zhao, W R, Zhao, H Q, Zheng, 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, and B S, Zou
Abstract: We report measurements of the continuum R(uds) near the center-of-mass energy of 3.70 GeV, the R[uds(c)+psi(3770)](s) and the R(had)(s) values in e(+)e(-) annihilation at 68 energy points in the energy region between 3.650 and 3.872 GeV with the BES-II detector at the BEPC Collider. We obtain the R(uds) for the continuum light hadron (containing u, d, and s quarks) production near the DD threshold to be R(uds)=2.141+/-0.025+/-0.085.
Published: 2006

358. Measurements of the Branching Fractions forψ(3770)→D0D¯0,D+D−,DD¯, and the Resonance Parameters ofψ(3770)andψ(2S)

Author: J. Nie, Y. S. Dai, C. S. Gao, Jinxing Zheng, N. Wu, L. L. Ma, Zheng Wang, Xingzhu Cui, Jiming Yang, Z. A. Liu, Yingchun Zhu, H. B. Li, C. L. Luo, J. W. Zhao, Y. T. Gu, Y. Ban, Houbing Lu, Yudan Wang, H. X. Yang, Yang Tian, Z. Y. Yi, D. L. Shen, S. X. Du, S. S. Sun, C. C. Zhang, Yi Jin, G. W. Yu, Zujian Wang, J. C. Chen, H. S. Chen, Y. Li, G. R. Lu, M. L. Yan, F. C. Ma, C. X. Liu, J. P. Liu, J. Fang, Yu Zeng, Z. A. Zhu, X. Y. Zhang, J. Z. Bai, Xunchao Zhang, S. P. Chi, R. G. Liu, G. F. Xu, Z. Y. Ren, F. Lu, Q. M. Ma, S. Jin, Y. N. Guo, J. B. Liu, Y. Zeng, Z. Z. Du, L. S. Wang, Y. Yuan, X. Tang, D. H. Wei, M. G. Zhao, Y. S. Zhu, K. L. He, J. F. Qiu, Y. Q. Guo, J. G. Bian, H. H. Liu, K. J. Zhu, J. C. Li, Feng Shi, Y. B. Chen, H. Y. Zhang, J. M. Yuan, B.S. Zou, W. G. Li, X. X. Xie, P. P. Zhao, L. Y. Dong, Y. F. Lai, H. F. Chen, J. Y. Zhang, D. Y. Wang, Z. Y. Wang, W. F. Wang, X. M. Xia, X. T. Huang, G. Rong, Y. K. Heng, C. Z. Yuan, Zhe Wang, R. Y. Li, Y. C. Zhu, Shang Lunlin, H. Y. Sheng, Fang Liu, Z. P. Zheng, Qiyang Zhang, Z. Q. Tan, Cunfeng Wei, Q. F. Dong, P. L. Wang, Ning Zhou, X. Y. Shen, G. Li, J. W. Zhang, N. D. Qi, D. X. Zhao, B. Y. Zhang, X. Shi, Huirun Chen, Hangxu Li, P. Wang, H. M. Liu, J. B. Jiao, X. H. Mo, Bo Xin, Z. P. Zhang, M. H. Ye, C. D. Fu, W. D. Li, Z. J. Sun, Xiru Huang, Z. Y. Deng, G. L. Tong, M. Ablikim, B. A. Zhuang, Jin Chen, S. S. Fang, Jianwei Sun, J. G. Lu, T. Hu, X. Q. Li, XZ（蔡翔舟） Cai, X. L. Li, Y. P. Chu, X. B. Ji, Lianyou Shan, B. X. Zhang, H. Qin, X. S. Jiang, S. L. Zang, Y. F. Liang, D. P. Jin, D. H. Zhang, Hongbo Liao, Yiyun Zhang, Y. X. Ye, X. B. Ma, Xuai Zhuang, H. L. Ma, S. M. Li, Fan Yang, S. D. Gu, Miao He, L. P. Zhou, Z. P. Mao, W. R. Zhao, F. Liu, Y. N. Gao, Z. Y. Zhang, Han-Qing Zheng, H. M. Hu, Y. X. Yang, Q. M. Zhu, Y. C. Xu, M. Z. Wang, Y. Z. Sun, H. S. Sun, and Haiping Peng
Subjects: Physics, Particle decay, Pair production, Nuclear magnetic resonance, Branching fraction, Electron–positron annihilation, Hadron, Analytical chemistry, General Physics and Astronomy, Resonance, Branching (polymer chemistry)
Abstract: We measure the branching fractions for psi(3770)-->D(0)D[over ](0), D+D-, DD[over ], and non-DD[over ] to be (46.7+/-4.7+/-2.3)%, (36.9+/-3.7+/-2.8)%, (83.6+/-7.3+/-4.2)%, and (16.4+/-7.3+/-4.2)%, respectively. The resonance parameters of psi(3770) and psi(2S) are measured to be M_(psi(3770))=3772.2+/-0.7+/-0.3 MeV, Gamma_(psi(3770))(tot)=26.9+/-2.4+/-0.3 MeV, and Gamma_(psi(3770))(ee)=251+/-26+/-11 eV; M_(psi(2S))=3685.5+/-0.0+/-0.3 MeV, Gamma_(psi(2S))(tot)=331+/-58+/-2 keV, and Gamma_(psi(2S))(ee)=2.330+/-0.036+/-0.110 keV. We also measure the light hadron R value to be R(uds)=2.262+/-0.054+/-0.109 in the energy region from 3.660 to 3.872 GeV.
Published: 2006

359. Observation of Two NewN*Peaks inJ/ψ→pπ−n¯andp¯π+nDecays

Author: C. Z. Yuan, Zhe Wang, Jun-Bing Ma, X. Y. Ma, W. X. Gong, J. C. Li, X. Shi, Qiyang Zhang, P. Wang, X. Q. Li, H. Qin, Ke Wang, H. Y. Zhang, G. S. Huang, H. Y. Sheng, J. Nie, S. P. Chi, X. H. He, Jin Wang, K. J. Zhu, J. M. Yuan, Chun-Hua Jiang, Zujian Wang, J. Y. Zhang, H. S. Chen, Huirun Chen, N. D. Qi, Y. B. Zhao, Y. S. Dai, C. S. Gao, X. J. Zhao, X. H. Mo, L. S. Wang, M. H. Ye, Juan Zhang, Shang Lunlin, Jinxing Zheng, G. Li, Y. K. Heng, C. D. Fu, Z. Y. Deng, Y. Y. Zhang, Y. X. Yang, Z. Y. Zhang, Y. P. Chu, X. B. Ji, J. G. Lu, Z. G. Zhao, Han-Qing Zheng, S. T. Xue, L. Huang, B.S. Zou, Z. J. Sun, T. Hu, XZ（蔡翔舟） Cai, Z. J. Guo, X. L. Li, S. L. Olsen, Z. Y. Wang, H. B. Li, C. L. Luo, H. M. Hu, Y. N. Guo, Lianyou Shan, M. L. Chen, Nongjian Tao, C. C. Zhang, L. Y. Dong, Yu Zeng, Y. J. Zhang, X. C. Zhong, R. Y. Li, Cunfeng Wei, Ning Zhou, J. W. Zhang, Z. D. Nie, X. Y. Zhang, Jiming Yang, R. G. Liu, Q. J. Li, Y. M. Wu, J. B. Liu, D. H. Wei, S. D. Gu, Q. Yue, J. Z. Wang, Xintong Li, X. X. Xie, G. S. Varner, Qingying Jia, Y. F. Liang, D. P. Jin, Jun Chen, Zheng Wang, D. H. Zhang, C. S. Yu, Z. Z. Du, Z. X. Liu, L. L. Ma, Yudan Wang, Z. A. Liu, G. R. Lu, J. C. Chen, Y. Ban, Z. A. Zhu, J. Z. Bai, J. Fang, L. S. Zheng, S. L. Zang, Q. M. Zhu, Y. C. Xu, M. Z. Wang, S. Z. Wang, H. S. Sun, Haiping Peng, S. D. Yang, K. L. He, H. L. Dai, R. B. Li, Jin Chen, L. H. Yi, Y. Jin, S. S. Fang, Xunchao Zhang, M. G. Zhao, Yingchun Zhu, Z. Y. Yi, X. L. Luo, Miao He, L. P. Zhou, Z. P. Mao, X. Tang, B. X. Zhang, Z. P. Zheng, Xiru Huang, M. Y. Gong, G. L. Tong, M. Ablikim, B. A. Zhuang, Yang Tian, S. X. Du, M. L. Yan, Q. M. Ma, Fang Liu, Y. Yuan, Y. S. Zhu, J. G. Bian, Feng Shi, D. X. Zhao, B. Y. Zhang, Guangzhao Zhou, Hangxu Li, Jiemin Li, J. B. Zhao, X. Y. Shen, G. F. Xu, S. Jin, F. Li, F. C. Ma, S. Q. Zhang, Y. Z. Sun, J. F. Qiu, C. D. Qian, S. M. Li, Fan Yang, Bing Zhou, W. R. Zhao, F. Liu, Y. N. Gao, Y. Zeng, Y. Q. Guo, Y. B. Chen, J. W. Zhao, Y. F. Lai, H. F. Chen, W. F. Wang, G. W. Yu, N. Wu, P. P. Zhao, Lei Zhang, G. Rong, Y. C. Zhu, X. S. Jiang, Bo Xin, P. L. Wang, W. G. Li, D. Y. Wang, H. M. Liu, J. F. Chang, Hongbo Liao, Yiyun Zhang, Y. X. Ye, H. X. Yang, H.S. Xu, J. P. Liu, F. A. Harris, Z. Y. Ren, Z. P. Zhang, Xingzhu Cui, S. S. Sun, X. M. Xia, H. Y. Fu, D. L. Shen, C. X. Liu, and F. Lu
Subjects: Physics, General Physics and Astronomy
Published: 2006

360. First observation ofψ(2S)→pn¯π−+c.c

Author: P. Wang, X. Q. Li, Z. J. Guo, H. X. Yang, S. D. Gu, Z. G. Zhao, H. Qin, Q. M. Ma, Y. Yuan, Y. S. Zhu, Xunchao Zhang, J. W. Zhao, K. L. He, S. H. Zhang, X. Y. Shen, J. P. Liu, F. Lu, Y. C. Zhu, Q. M. Zhu, G. W. Yu, J. G. Lu, Z. J. Sun, R. Y. Li, Z. Y. Ren, Y. C. Xu, G. S. Varner, Huirun Chen, Yu Zeng, Y. C. Lou, L. S. Wang, M. G. Zhao, H. Y. Sheng, Z. Q. Tan, Cunfeng Wei, T. Hu, H. H. Liu, P. L. Wang, J. C. Li, XZ（蔡翔舟） Cai, X. L. Li, Q. F. Dong, B. J. Liu, Yudan Wang, Ning Zhou, N. D. Qi, M. Z. Wang, H. S. Sun, J. W. Zhang, Y. F. Liang, H. Y. Zhang, X. N. Li, Jin Chen, S. S. Fang, Miao He, R. G. Ping, D. P. Jin, G. R. Lu, Haiping Peng, Y. Zeng, G. S. Huang, Z. A. Zhu, C. Z. Yuan, Y. Q. Guo, Lianyou Shan, J. Y. Zhang, F. A. Harris, Zhe Wang, Fang Liu, D. H. Zhang, Y. B. Chen, Z. P. Zhang, H. Q. Zhang, S. X. Du, C. P. Shen, X. H. Mo, Y. F. Lai, L. P. Zhou, M. H. Ye, Han-Qing Zheng, F. C. Ma, H. B. Li, M. L. Yan, H. F. Chen, W. F. Wang, C. L. Luo, Y. K. Heng, S. L. Olsen, D. X. Zhao, B. Y. Zhang, Hangxu Li, W. G. Li, C. C. Zhang, X. Y. Zhang, Z. Y. Wang, N. Wu, H. M. Hu, L. L. Wang, Zheng Wang, D. Y. Wang, R. G. Liu, J. B. Liu, Zujian Wang, J. F. Qiu, Xingzhu Cui, Z. P. Mao, L. L. Ma, W. D. Li, L. Y. Diao, H. M. Liu, Z. A. Liu, J. B. Jiao, J. C. Chen, Y. Ban, Y. T. Gu, S. S. Sun, H. S. Chen, X. S. Jiang, J. Fang, B.S. Zou, J. Z. Bai, Y. N. Guo, J. Nie, D. H. Wei, X. Tang, Y. S. Dai, C. S. Gao, Jinxing Zheng, Hongbo Liao, Yiyun Zhang, X. X. Xie, S. L. Zang, Y. X. Ye, Q. Liu, X. B. Ma, Xuai Zhuang, Yingchun Zhu, H. L. Ma, Z. Y. Yi, S. M. Li, Y. Li, W. R. Zhao, F. Liu, Y. N. Gao, Y. X. Yang, Y. Z. Sun, X. M. Xia, Shang Lunlin, G. F. Xu, G. Li, S. Jin, C. D. Fu, Z. Y. Deng, S. P. Chi, K. J. Zhu, J. M. Yuan, D. L. Shen, C. X. Liu, Y. P. Chu, X. P. Xu, X. B. Ji, B. X. Zhang, Z. P. Zheng, G. L. Tong, M. Ablikim, B. A. Zhuang, X. Y. Jiang, Jianwei Sun, Yi Jin, J. G. Bian, P. P. Zhao, X. T. Huang, and G. Rong
Subjects: Physics, Nuclear and High Energy Physics, Crystallography, Electron–positron annihilation, Atomic physics
Abstract: Using $14\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\psi}(2S)$ events collected with the Beijing Spectrometer (BESII) at the Beijing Electron-Positron Collider, the branching fractions of $\ensuremath{\psi}(2S)$ decays to $p\overline{n}{\ensuremath{\pi}}^{\ensuremath{-}}$ and $\overline{p}n{\ensuremath{\pi}}^{+}$ and the branching fractions of the main background channels $\ensuremath{\psi}(2S)\ensuremath{\rightarrow}p\overline{n}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$, $\ensuremath{\psi}(2S)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\chi}}_{c0}\ensuremath{\rightarrow}\ensuremath{\gamma}p\overline{n}{\ensuremath{\pi}}^{\ensuremath{-}}$, $\ensuremath{\psi}(2S)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\chi}}_{c2}\ensuremath{\rightarrow}\ensuremath{\gamma}p\overline{n}{\ensuremath{\pi}}^{\ensuremath{-}}$, and $\ensuremath{\psi}(2S)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\chi}}_{cJ}\ensuremath{\rightarrow}\ensuremath{\gamma}p\overline{n}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ are determined. The contributions of the ${N}^{*}$ resonances in $\ensuremath{\psi}(2S)\ensuremath{\rightarrow}p\overline{n}{\ensuremath{\pi}}^{\ensuremath{-}}+c.c.$ are also discussed.
Published: 2006

361. Search for invisible decays of eta and eta' in J/psi --phi eta and phi eta'

Author: 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, S S, Fang, 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, H B, Li, 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, J P, Liu, Q, Liu, R G, Liu, Z A, Liu, Y C, Lou, F, Lu, G R, Lu, J G, Lu, C L, Luo, F C, Ma, 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, G, Rong, L Y, Shan, L, Shang, C P, Shen, D L, Shen, X Y, Shen, 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, M, Wang, P, Wang, P L, Wang, W F, Wang, Y F, Wang, 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, M H, Ye, Y X, Ye, Z Y, Yi, G W, Yu, C Z, Yuan, 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 Q, Zhang, 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, H Q, Zheng, 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, and B S, Zou
Abstract: Using a data sample of 58 x 10(6) J/psi decays collected with the Beijing Spectrometer II detector at the Beijing Electron Positron Collider, searches for invisible decays of eta and eta' in J/psi to phi eta and phi eta' are performed. The phi signals, which are reconstructed in K+K- final states, are used to tag the eta and eta' decays. No signals are found for the invisible decays of either eta or eta', and upper limits at the 90% confidence level are determined to be 1.65 x 10(-3) for the ratio B(eta--invisible)/B(eta --gamma gamma) and 6.69 x 10(-2) for B(eta' --invisible)/B(eta' --gammagamma). These are the first searches for eta and eta' decays into invisible final states.
Published: 2006

362. Observation of a broad 1-- resonant structure around 1.5 GeV/c2 in the K+K- mass spectrum in J/psi--K+K-pi0

Author: 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, S P, Chi, Y P, Chu, X Z, Cui, Y S, Dai, Z Y, Deng, L Y, Dong, Q F, Dong, S X, Du, Z Z, Du, J, Fang, S S, Fang, 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 P, Huang, X T, Huang, X B, Ji, X S, Jiang, J B, Jiao, D P, Jin, S, Jin, Yi, Jin, Y F, Lai, G, Li, H B, Li, H H, Li, J, Li, R Y, Li, S M, Li, W D, Li, 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, J P, Liu, R G, Liu, Z A, Liu, F, Lu, G R, Lu, H J, Lu, J G, Lu, C L, Luo, F C, Ma, 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, N D, Qi, H, Qin, J F, Qiu, Z Y, Ren, G, Rong, L Y, Shan, L, Shang, D L, Shen, X Y, Shen, 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, G S, Varner, D Y, Wang, L, Wang, L S, Wang, M, Wang, P, Wang, P L, Wang, W F, Wang, Y F, Wang, Z, Wang, Z Y, Wang, 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, M H, Ye, Y X, Ye, Z Y, Yi, G W, Yu, C Z, Yuan, 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, Y Y, Zhang, Z P, Zhang, Z Q, Zhang, D X, Zhao, J W, Zhao, M G, Zhao, P P, Zhao, W R, Zhao, Z G, Zhao, H Q, Zheng, J P, Zheng, Z P, Zheng, L, Zhou, N F, Zhou, K J, Zhu, Q M, Zhu, Y C, Zhu, Yingchun, Zhu, Y S, Zhu, Z A, Zhu, B A, Zhuang, X A, Zhuang, and B S, Zou
Abstract: A broad peak is observed at low K+K- invariant mass in J/psi--K+K-pi(0) decays found in a sample of 5.8x10(7) J/psi events collected with the BESII detector. The statistical significance of the broad resonance is much larger than 5sigma. A partial wave analysis shows that the J;{PC} of this structure is 1--. Its pole position is determined to be [1576(-55)(+49)(stat)-91+98(syst)] MeV/c(2)-i/2[818(-23)(+22)(stat)-133+64(syst)] MeV/c(2). These parameters are not compatible with any known meson resonances.
Published: 2006

363. Pseudoscalar production atωωthreshold inJ/ψ→γωω

Author: 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, S. S. Fang, 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, H. B. Li, 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, J. P. Liu, Q. Liu, R. G. Liu, Z. A. Liu, Y. C. Lou, F. Lu, G. R. Lu, J. G. Lu, C. L. Luo, F. C. Ma, 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, G. Rong, L. Y. Shan, L. Shang, C. P. Shen, D. L. Shen, X. Y. Shen, 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, M. Wang, P. Wang, P. L. Wang, W. F. Wang, Y. F. Wang, 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, M. H. Ye, Y. X. Ye, Z. Y. Yi, G. W. Yu, C. Z. Yuan, 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. Q. Zhang, 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, H. Q. Zheng, 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, and B. S. Zou
Subjects: Pseudoscalar, Physics, Nuclear and High Energy Physics, Particle decay, Crystallography, Branching fraction, Partial wave analysis, Product (mathematics), Center (category theory), High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, Omega
Abstract: The decay channel J/{psi}{yields}{gamma}{omega}{omega}, {omega}{yields}{pi}{sup +}{pi}{sup -}{pi}{sup 0} is analyzed using a sample of 5.8x10{sup 7} J/{psi} events collected with the BESII detector. The {omega}{omega} invariant mass distribution peaks at 1.76 GeV/c{sup 2}, just above the {omega}{omega} threshold. Analysis of angular correlations indicates that the {omega}{omega} system below 2 GeV/c{sup 2} is predominantly pseudoscalar. A partial wave analysis confirms the predominant pseudoscalar structure, together with small 0{sup ++} and 2{sup ++} contributions, and yields a pseudoscalar mass M=1744{+-}10 (stat){+-}15 (syst) MeV/c{sup 2}, a width {gamma}=244{sub -21}{sup +24} (stat){+-}25 (syst) MeV/c{sup 2}, and a product branching fraction Br(J/{psi}{yields}{gamma}{eta}(1760)){center_dot}Br({eta}(1760){yields}{omega}{omega})=(1.98{+-}0.08 (stat){+-}0.32 (syst))x10{sup -3}.
Published: 2006

364. Measurements of the branching fractions for psi(3770)--D(0)D[over ](0), D+D-, DD[over ], and the resonance parameters of psi(3770) and psi(2S)

Author: 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, L Y, Dong, Q F, Dong, S X, Du, Z Z, Du, J, Fang, S S, Fang, 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, G, Li, H B, Li, H H, Li, J, Li, R Y, Li, S M, Li, W D, Li, 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, J P, Liu, R G, Liu, Z A, Liu, F, Lu, G R, Lu, H J, Lu, J G, Lu, C L, Luo, F C, Ma, 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, G, Rong, L Y, Shan, L, Shang, D L, Shen, X Y, Shen, 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, M, Wang, P, Wang, P L, Wang, W F, Wang, Y F, Wang, Z, Wang, Z Y, Wang, 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, M H, Ye, Y X, Ye, Z Y, Yi, G W, Yu, C Z, Yuan, 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, Z Q, Zhang, D X, Zhao, J W, Zhao, M G, Zhao, P P, Zhao, W R, Zhao, H Q, Zheng, 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, and B S, Zou
Abstract: We measure the branching fractions for psi(3770)--D(0)D[over ](0), D+D-, DD[over ], and non-DD[over ] to be (46.7+/-4.7+/-2.3)%, (36.9+/-3.7+/-2.8)%, (83.6+/-7.3+/-4.2)%, and (16.4+/-7.3+/-4.2)%, respectively. The resonance parameters of psi(3770) and psi(2S) are measured to be M_(psi(3770))=3772.2+/-0.7+/-0.3 MeV, Gamma_(psi(3770))(tot)=26.9+/-2.4+/-0.3 MeV, and Gamma_(psi(3770))(ee)=251+/-26+/-11 eV; M_(psi(2S))=3685.5+/-0.0+/-0.3 MeV, Gamma_(psi(2S))(tot)=331+/-58+/-2 keV, and Gamma_(psi(2S))(ee)=2.330+/-0.036+/-0.110 keV. We also measure the light hadron R value to be R(uds)=2.262+/-0.054+/-0.109 in the energy region from 3.660 to 3.872 GeV.
Published: 2006

365. Observation of a Near-Threshold Enhancement in theωϕMass Spectrum from the Doubly OZI-Suppressed DecayJ/ψ→γωϕ

Author: 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, S. S. Fang, 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, H. B. Li, 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, J. P. Liu, Q. Liu, R. G. Liu, Z. A. Liu, Y. C. Lou, F. Lu, G. R. Lu, J. G. Lu, C. L. Luo, F. C. Ma, 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, G. Rong, L. Y. Shan, L. Shang, C. P. Shen, D. L. Shen, X. Y. Shen, 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, M. Wang, P. Wang, P. L. Wang, W. F. Wang, Y. F. Wang, 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, M. H. Ye, Y. X. Ye, Z. Y. Yi, G. W. Yu, C. Z. Yuan, 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. Q. Zhang, 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, H. Q. Zheng, 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, and B. S. Zou
Subjects: Physics, Quantum chromodynamics, Particle physics, Branching fraction, Electron–positron annihilation, Partial wave analysis, General Physics and Astronomy, Omega, Nuclear physics, Near threshold, Mass spectrum, High Energy Physics::Experiment, Invariant mass, Nuclear Experiment
Abstract: An enhancement near threshold is observed in the omega(phi) invariant mass spectrum from the doubly Okubo-Zweig-Iizuka-suppressed decays of J/psi-->gamma(omega)phi, based on a sample of 5.8 x 10(7) J/psi events collected with the BESII detector. A partial wave analysis shows that this enhancement favors JP=0+, and its mass and width are M=1812(+19)(-26)(stat)+/-18(syst) MeV/c2 and Gamma=105+/-20(stat)+/-28(syst) MeV/c2. The product branching fraction is determined to be B(J/psi-->gammaX)B(X-->omega(phi))=[2.61+/-0.27(stat)+/-0.65(syst)]x10(-4).
Published: 2006

366. Influence of guanidine on proteinase K resistance in vitro and infectivity of scrapie prion protein PrP(Sc)

Author: J M, Gao, X B, Zhou, X L, Xiao, J, Zhang, L, Chen, C, Gao, B Y, Zhang, and X P, Dong
Subjects: Protein Denaturation, Dose-Response Relationship, Drug, Mesocricetus, PrPSc Proteins, Solubility, Cricetinae, Animals, Female, Endopeptidase K, Guanidine
Abstract: As the scrapie prion protein PrP(Sc) is rich in beta-sheets it aggregates into prion rods, which show infectivity and proteinase K (PK) resistance. Consequently, dissociation of prion rods and breakdown of beta-sheets in PrP(Sc) by denaturation results in loss of both infectivity and PK-sensitivity. In this study, the effects of guanidine (Gdn), which solubilizes and denatures proteins by breaking down their higher structure, on the solubility, the PK-resistance in vitro and the infectivity of PrP(Sc) of scrapie strain 263K was examined. The infectivity was assayed by intracerebral inoculation into hamsters. Brain tissues of scrapie-infected hamsters were used for preparation of homogenates and crude extracts of PrP(Sc). A treatment of PrP(Sc) with Gdn enhanced its PK-sensitivity in a dose-dependent manner. The PK-resistance in vitro of PrP(Sc) denatured with lower concentrations of Gdn (2.5 mol/l) could partially resume by renaturation. Gdn markedly reduced or, at higher concentrations, even destroyed the infectivity of PrP(Sc). On the other hand, the infectivity of PrP(Sc) inactivated by denaturation could be partially restored by renaturation. These results confirmed our assumption that all the alternations in the PK-resistance and the infectivity of PrP(Sc) caused by Gdn resulted from changes in its higher structure. However, it should be emphasized that a complete loss of PK-resistance of PrP(Sc) may not necessarily mean its full non-infectivity.
Published: 2006

367. Measurement of the branching fractions forJ/ψ→γπ0,γηandγη′

Author: Zheng Wang, F. C. Ma, H. L. Ma, S. M. Li, Q. M. Zhu, Huirun Chen, H. X. Yang, W. D. Li, Z. G. Zhao, S. D. Gu, Y. C. Xu, J. C. Chen, S. H. Zhang, X. Y. Shen, J. Fang, X. Tang, M. Z. Wang, Xunchao Zhang, Y. N. Guo, H. S. Sun, G. S. Varner, P. P. Zhao, X. H. Mo, L. S. Wang, X. S. Jiang, M. H. Ye, B.S. Zou, X. N. Li, J. P. Liu, W. R. Zhao, F. Liu, Z. J. Sun, M. G. Zhao, J. F. Qiu, Haiping Peng, Yingchun Zhu, S. X. Du, M. L. Yan, L. L. Wang, Z. Y. Ren, J. W. Zhao, Z. Y. Yi, Y. N. Gao, H. Y. Zhang, G. S. Huang, G. W. Yu, B. J. Liu, Yudan Wang, P. Wang, G. R. Lu, H. B. Li, J. Y. Zhang, Y. Li, G. F. Xu, J. G. Lu, C. L. Luo, X. Q. Li, H. S. Chen, S. Jin, Y. X. Yang, R. Y. Li, T. Hu, XZ（蔡翔舟） Cai, X. L. Li, C. C. Zhang, Z. A. Zhu, Xingzhu Cui, H. Qin, X. T. Huang, G. Rong, Cunfeng Wei, Q. F. Dong, Han-Qing Zheng, Ning Zhou, F. Lu, Y. Z. Sun, W. G. Li, Lianyou Shan, J. W. Zhang, Miao He, D. Y. Wang, J. Nie, C. P. Shen, L. P. Zhou, S. S. Sun, H. H. Liu, J. C. Li, K. L. He, N. Wu, Z. P. Mao, Z. P. Zheng, H. M. Liu, H. M. Hu, Y. S. Dai, C. S. Gao, X. M. Xia, Jinxing Zheng, Y. C. Zhu, Y. T. Gu, Z. J. Guo, C. Z. Yuan, Yi Jin, Zhe Wang, S. L. Zang, P. L. Wang, H. Q. Zhang, Fang Liu, Jin Chen, G. L. Tong, Q. M. Ma, D. H. Wei, X. Y. Zhang, R. G. Liu, M. Ablikim, B. A. Zhuang, J. B. Liu, X. Y. Jiang, S. S. Fang, D. X. Zhao, B. Y. Zhang, F. A. Harris, Zujian Wang, Jianwei Sun, Hangxu Li, L. Y. Diao, Y. Zeng, Z. P. Zhang, X. B. Ma, Xuai Zhuang, Y. Q. Guo, J. B. Jiao, Y. Yuan, Y. S. Zhu, D. L. Shen, Hongbo Liao, Y. B. Chen, C. X. Liu, Y. F. Lai, H. F. Chen, Q. Liu, W. F. Wang, Yiyun Zhang, S. L. Olsen, Y. F. Liang, B. X. Zhang, D. P. Jin, Y. X. Ye, J. G. Bian, Z. Y. Wang, D. H. Zhang, X. X. Xie, Yu Zeng, Y. C. Lou, Y. K. Heng, Y. P. Chu, X. P. Xu, X. B. Ji, Shang Lunlin, G. Li, C. D. Fu, Z. Y. Deng, S. P. Chi, K. J. Zhu, J. M. Yuan, H. Y. Sheng, Z. Q. Tan, N. D. Qi, R. G. Ping, L. L. Ma, Z. A. Liu, Y. Ban, and J. Z. Bai
Subjects: Systematic error, Pseudoscalar, Physics, Nuclear and High Energy Physics, Branching fraction, Astrophysics::High Energy Astrophysical Phenomena, Pi, Analytical chemistry, High Energy Physics::Experiment, Branching (polymer chemistry)
Abstract: The decay modes J/{psi}{yields}{gamma}{pi}{sup 0}, {gamma}{eta} and {gamma}{eta}{sup '} are analyzed using a data sample of 58x10{sup 6} J/{psi} decays collected with the BESII detector at the BEPC. The branching fractions are determined to be: Br(J/{psi}{yields}{gamma}{pi}{sup 0})=(3.13{sub -0.47}{sup +0.65})x10{sup -5}, Br(J/{psi}{yields}{gamma}{eta})=(11.23{+-}0.89)x10{sup -4}, and Br(J/{psi}{yields}{gamma}{eta}{sup '})=(5.55{+-}0.44)x10{sup -3}, where the errors are combined statistical and systematic errors. The ratio of partial widths {gamma}(J/{psi}{yields}{gamma}{eta}{sup '})/{gamma}(J/{psi}{yields}{gamma}{eta}) is measured to be 4.94{+-}0.40, and the singlet-octet pseudoscalar mixing angle of {eta}-{eta}{sup '} system is determined.
Published: 2006

368. Measurement ofχcJdecays to2(π+π−)pp¯final states

Author: L. S. Wang, M. G. Zhao, X. S. Jiang, F. C. Ma, S. L. Zang, Y. N. Guo, J. F. Qiu, X. X. Xie, X. Tang, Y. C. Zhu, P. L. Wang, F. A. Harris, Yi Jin, Z. P. Zhang, Fang Liu, H. Y. Zhang, Q. Liu, G. S. Huang, Z. P. Zheng, D. X. Zhao, B. J. Liu, Miao He, Yingchun Zhu, B. Y. Zhang, Y. X. Yang, Yudan Wang, Hangxu Li, L. P. Zhou, J. G. Lu, J. Y. Zhang, G. R. Lu, Z. P. Mao, Q. M. Zhu, Han-Qing Zheng, P. P. Zhao, Huirun Chen, X. Y. Zhang, T. Hu, R. G. Liu, Xingzhu Cui, Y. Z. Sun, G. L. Tong, Z. A. Zhu, Z. Y. Yi, M. Ablikim, B. A. Zhuang, X. Y. Jiang, Z. J. Guo, H. M. Hu, XZ（蔡翔舟） Cai, X. L. Li, Y. K. Heng, J. B. Liu, S. S. Sun, Y. C. Xu, Hongbo Liao, M. Z. Wang, F. Lu, C. P. Shen, X. H. Mo, Y. Li, M. H. Ye, Jianwei Sun, Zheng Wang, X. T. Huang, G. Rong, S. D. Gu, H. S. Chen, X. B. Ma, Xuai Zhuang, Y. P. Chu, X. P. Xu, X. B. Ji, Y. Zeng, Yiyun Zhang, Jin Chen, S. S. Fang, Lianyou Shan, G. S. Varner, L. L. Wang, Y. X. Ye, Y. Q. Guo, H. Y. Sheng, Z. Q. Tan, J. B. Jiao, H. S. Sun, X. N. Li, H. L. Ma, S. M. Li, Y. B. Chen, Q. M. Ma, S. X. Du, M. L. Yan, J. C. Chen, Y. F. Lai, Haiping Peng, H. F. Chen, W. F. Wang, Shang Lunlin, N. D. Qi, G. Li, J. Fang, C. D. Fu, S. H. Zhang, X. Y. Shen, Y. Yuan, Y. S. Zhu, Y. T. Gu, N. Wu, Z. Y. Deng, J. G. Bian, R. G. Ping, L. L. Ma, W. R. Zhao, J. Nie, F. Liu, Z. A. Liu, S. L. Olsen, X. Q. Li, B. X. Zhang, Y. N. Gao, D. H. Wei, Y. Ban, S. P. Chi, C. Z. Yuan, Zhe Wang, Z. Y. Wang, H. Qin, K. L. He, K. J. Zhu, J. M. Yuan, J. Z. Bai, P. Wang, Y. S. Dai, C. S. Gao, Yu Zeng, R. Y. Li, Y. C. Lou, Jinxing Zheng, Cunfeng Wei, Q. F. Dong, Ning Zhou, J. W. Zhang, B.S. Zou, W. D. Li, H. Q. Zhang, J. W. Zhao, G. W. Yu, Zujian Wang, L. Y. Diao, Y. F. Liang, D. P. Jin, H. H. Liu, J. C. Li, D. H. Zhang, Z. G. Zhao, Z. J. Sun, H. X. Yang, H. B. Li, C. L. Luo, C. C. Zhang, J. P. Liu, Z. Y. Ren, W. G. Li, D. Y. Wang, H. M. Liu, G. F. Xu, S. Jin, D. L. Shen, C. X. Liu, X. M. Xia, and Xunchao Zhang
Subjects: Physics, Nuclear and High Energy Physics, Crystallography, Lambda
Abstract: Using ${\ensuremath{\chi}}_{{c}_{J}}\ensuremath{\rightarrow}2({\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})p\overline{p}$ decays from $14\ifmmode\times\else\texttimes\fi{}{10}^{6}\ensuremath{\psi}(2S)$ events accumulated by the BESII detector at the BEPC, the intermediate states ${\ensuremath{\Xi}}^{\ensuremath{-}}{\overline{\ensuremath{\Xi}}}^{+}$, $\ensuremath{\Lambda}\overline{\ensuremath{\Lambda}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, and ${K}_{S}^{0}{K}_{S}^{0}p\overline{p}$ are studied, and their branching ratios or upper limits are measured.
Published: 2006

369. Experimental study ofψ2Sdecays toK+K−π+π−π0final states

Author: J. C. Li, Zheng Wang, J. B. Jiao, P. Wang, P. P. Zhao, Jin Chen, Q. M. Zhu, S. S. Fang, J. C. Chen, Xingzhu Cui, X. Tang, Y. C. Xu, W. G. Li, K. L. He, Y. T. Gu, Z. G. Zhao, F. C. Ma, S. L. Zang, D. Y. Wang, B. J. Liu, Yudan Wang, M. Z. Wang, F. Lu, X. T. Huang, Shang Lunlin, G. Rong, G. Li, Q. M. Ma, G. R. Lu, S. S. Sun, Z. J. Sun, J. Fang, X. Y. Zhang, R. G. Liu, H. S. Sun, C. D. Fu, J. W. Zhao, Y. Yuan, Y. S. Zhu, H. M. Liu, H. B. Li, C. L. Luo, X. N. Li, J. B. Liu, D. H. Wei, Z. Y. Deng, C. C. Zhang, Haiping Peng, G. W. Yu, Xunchao Zhang, Z. A. Zhu, X. X. Xie, C. Z. Yuan, Yingchun Zhu, Zhe Wang, H. Y. Sheng, J. F. Qiu, Q. Liu, Z. Q. Tan, H. L. Ma, S. P. Chi, Han-Qing Zheng, S. M. Li, N. D. Qi, K. J. Zhu, Fang Liu, J. M. Yuan, J. G. Bian, R. G. Ping, C. P. Shen, Miao He, Z. Y. Yi, L. L. Ma, Z. A. Liu, L. S. Wang, M. G. Zhao, L. P. Zhou, Y. Ban, Y. F. Liang, Yu Zeng, J. P. Liu, D. X. Zhao, B. Y. Zhang, D. P. Jin, Hangxu Li, Z. P. Mao, Y. P. Chu, Y. C. Lou, X. P. Xu, X. B. Ji, J. G. Lu, D. H. Zhang, Huirun Chen, H. M. Hu, W. D. Li, H. Y. Zhang, J. Z. Bai, Y. Li, W. R. Zhao, Y. C. Zhu, G. S. Huang, T. Hu, XZ（蔡翔舟） Cai, F. Liu, Y. N. Guo, X. H. Mo, Yi Jin, M. H. Ye, P. L. Wang, J. Y. Zhang, X. L. Li, X. B. Ma, Xuai Zhuang, S. H. Zhang, X. Y. Shen, L. L. Wang, H. X. Yang, Y. N. Gao, Y. K. Heng, J. Nie, Lianyou Shan, F. A. Harris, Z. P. Zhang, S. L. Olsen, Y. S. Dai, C. S. Gao, Y. X. Yang, B. X. Zhang, Z. P. Zheng, Z. Y. Ren, Z. Y. Wang, Jinxing Zheng, Hongbo Liao, S. X. Du, Y. Z. Sun, M. L. Yan, G. L. Tong, Yiyun Zhang, M. Ablikim, B. A. Zhuang, X. Y. Jiang, Jianwei Sun, Y. X. Ye, X. S. Jiang, S. D. Gu, G. S. Varner, X. Q. Li, H. S. Chen, H. Qin, H. Q. Zhang, N. Wu, Zujian Wang, L. Y. Diao, B.S. Zou, Y. Zeng, Z. J. Guo, Y. Q. Guo, Y. B. Chen, Y. F. Lai, H. F. Chen, W. F. Wang, R. Y. Li, Cunfeng Wei, Q. F. Dong, Ning Zhou, J. W. Zhang, X. M. Xia, D. L. Shen, C. X. Liu, G. F. Xu, S. Jin, and H. H. Liu
Subjects: Physics, Nuclear and High Energy Physics, Crystallography, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Omega
Abstract: ${K}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ final states are studied using a sample of $14\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\psi}(2S)$ decays collected with the Beijing Spectrometer (BESII) at the Beijing Electron-Positron Collider. The branching fractions of $\ensuremath{\psi}(2S)$ decays to ${K}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$, $\ensuremath{\omega}{K}^{+}{K}^{\ensuremath{-}}$, $\ensuremath{\omega}{f}_{0}(1710)$, ${K}^{*}(892{)}^{0}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}+\mathrm{c}.\mathrm{c}.$, ${K}^{*}(892{)}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}+\mathrm{c}.\mathrm{c}.$, ${K}^{*}(892{)}^{+}{K}^{\ensuremath{-}}{\ensuremath{\rho}}^{0}+\mathrm{c}.\mathrm{c}.$ and ${K}^{*}(892{)}^{0}{K}^{\ensuremath{-}}{\ensuremath{\rho}}^{+}+\mathrm{c}.\mathrm{c}.$ are determined. The first two agree with previous measurements, and the last five are first measurements.
Published: 2006

370. Observation of a near-threshold enhancement in the omega(phi) mass spectrum from the doubly OZI-suppressed decay J/psi--gamma(omega)phi

Author: 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, S S, Fang, 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, H B, Li, 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, J P, Liu, Q, Liu, R G, Liu, Z A, Liu, Y C, Lou, F, Lu, G R, Lu, J G, Lu, C L, Luo, F C, Ma, 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, G, Rong, L Y, Shan, L, Shang, C P, Shen, D L, Shen, X Y, Shen, 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, M, Wang, P, Wang, P L, Wang, W F, Wang, Y F, Wang, 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, M H, Ye, Y X, Ye, Z Y, Yi, G W, Yu, C Z, Yuan, 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 Q, Zhang, 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, H Q, Zheng, 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, and B S, Zou
Abstract: An enhancement near threshold is observed in the omega(phi) invariant mass spectrum from the doubly Okubo-Zweig-Iizuka-suppressed decays of J/psi--gamma(omega)phi, based on a sample of 5.8 x 10(7) J/psi events collected with the BESII detector. A partial wave analysis shows that this enhancement favors JP=0+, and its mass and width are M=1812(+19)(-26)(stat)+/-18(syst) MeV/c2 and Gamma=105+/-20(stat)+/-28(syst) MeV/c2. The product branching fraction is determined to be B(J/psi--gammaX)B(X--omega(phi))=[2.61+/-0.27(stat)+/-0.65(syst)]x10(-4).
Published: 2006

371. Observation of a ResonanceX(1835)inJ/ψ→γπ+π−η′

Author: Xingzhu Cui, P. P. Zhao, Huirun Chen, Shang Lunlin, G. Li, S. S. Sun, X. Y. Zhang, R. G. Liu, C. D. Fu, J. B. Liu, X. T. Huang, G. Rong, Z. Y. Deng, H. S. Chen, S. D. Gu, Feng Shi, X. Q. Li, F. C. Ma, X. H. Mo, Miao He, L. P. Zhou, J. B. Jiao, L. S. Wang, M. H. Ye, S. L. Zang, Z. P. Mao, Xunchao Zhang, X. B. Ma, Xuai Zhuang, H. Qin, B.S. Zou, G. S. Varner, J. P. Liu, J. F. Qiu, M. G. Zhao, Fang Liu, X. Shi, D. X. Zhao, B. Y. Zhang, X. Y. Shen, H. Y. Zhang, Hangxu Li, G. S. Huang, Z. Y. Zhang, Q. M. Ma, Yingchun Zhu, Y. P. Chu, Y. C. Zhu, X. B. Ji, J. Y. Zhang, J. W. Zhao, G. W. Yu, Y. K. Heng, Y. Y. Zhang, Han-Qing Zheng, J. Nie, F. Lu, P. L. Wang, H. M. Hu, Z. Y. Yi, H. Y. Sheng, Z. Q. Tan, Y. Li, Y. S. Dai, C. S. Gao, Jinxing Zheng, N. D. Qi, L. Y. Dong, Y. F. Liang, Y. N. Guo, F. A. Harris, R. Y. Li, D. P. Jin, W. R. Zhao, Z. P. Zhang, H. B. Li, Q. M. Zhu, C. L. Luo, Jin Chen, F. Liu, Cunfeng Wei, Q. F. Dong, Ning Zhou, Y. C. Xu, D. H. Zhang, C. Z. Yuan, S. S. Fang, Zhe Wang, S. P. Chi, Y. N. Gao, Houbing Lu, C. C. Zhang, M. Z. Wang, J. W. Zhang, Z. Z. Du, K. J. Zhu, J. M. Yuan, D. L. Shen, H. S. Sun, C. X. Liu, Bo Xin, Haiping Peng, W. D. Li, B. X. Zhang, Z. P. Zheng, Z. J. Guo, N. Wu, Y. X. Yang, J. G. Bian, G. F. Xu, S. Jin, X. Tang, Qiyang Zhang, Xiru Huang, G. L. Tong, P. Wang, M. Ablikim, B. A. Zhuang, Y. Z. Sun, Y. T. Gu, L. L. Ma, Jianwei Sun, Zheng Wang, Z. A. Liu, Y. Ban, H. H. Liu, J. C. Li, Yudan Wang, Zujian Wang, J. Z. Bai, D. H. Wei, J. C. Chen, G. R. Lu, Z. A. Zhu, Yi Jin, Jiming Yang, J. Fang, Z. G. Zhao, Yang Tian, X. M. Xia, S. X. Du, Z. J. Sun, M. L. Yan, K. L. He, Y. Zeng, Y. Q. Guo, Y. B. Chen, Y. F. Lai, H. F. Chen, W. F. Wang, X. S. Jiang, H. L. Ma, S. M. Li, Fan Yang, Yu Zeng, Y. Yuan, Y. S. Zhu, H. X. Yang, Hongbo Liao, Y. X. Ye, Z. Y. Ren, S. L. Olsen, Z. Y. Wang, W. G. Li, D. Y. Wang, H. M. Liu, J. G. Lu, T. Hu, XZ（蔡翔舟） Cai, X. L. Li, Lianyou Shan, and X. X. Xie
Subjects: Combinatorics, Physics, Meson, Branching fraction, Product (mathematics), General Physics and Astronomy
Abstract: The decay channel $J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\eta}}^{\ensuremath{'}}$ is analyzed using a sample of $5.8\ifmmode\times\else\texttimes\fi{}{10}^{7}$ $J/\ensuremath{\psi}$ events collected with the BESII detector. A resonance, the $X(1835)$, is observed in the ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\eta}}^{\ensuremath{'}}$ invariant-mass spectrum with a statistical significance of $7.7\ensuremath{\sigma}$. A fit with a Breit-Wigner function yields a mass $M=1833.7\ifmmode\pm\else\textpm\fi{}6.1(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}2.7(\mathrm{syst})\text{ }\text{ }\mathrm{MeV}/{c}^{2}$, a width $\ensuremath{\Gamma}=67.7\ifmmode\pm\else\textpm\fi{}20.3(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}7.7(\mathrm{syst})\text{ }\text{ }\mathrm{MeV}/{c}^{2}$, and a product branching fraction $B(J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}X)\ifmmode\cdot\else\textperiodcentered\fi{}B(X\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\eta}}^{\ensuremath{'}})=[2.2\ifmmode\pm\else\textpm\fi{}0.4(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.4(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. The mass and width of the $X(1835)$ are not compatible with any known meson resonance. Its properties are consistent with expectations for the state that produces the strong $p\overline{p}$ mass threshold enhancement observed in the $J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}p\overline{p}$ process at BESII.
Published: 2005

372. Partial wave analysis ofχc0→π+π−K+K−

Author: 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, L. Y. Dong, Q. F. Dong, S. X. Du, Z. Z. Du, J. Fang, S. S. Fang, 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. P. Huang, X. T. Huang, X. B. Ji, X. S. Jiang, J. B. Jiao, D. P. Jin, S. Jin, Yi Jin, Y. F. Lai, G. Li, H. B. Li, H. H. Li, J. Li, R. Y. Li, S. M. Li, W. D. Li, 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, J. P. Liu, R. G. Liu, Z. A. Liu, F. Lu, G. R. Lu, H. J. Lu, J. G. Lu, C. L. Luo, F. C. Ma, 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, N. D. Qi, H. Qin, J. F. Qiu, Z. Y. Ren, G. Rong, L. Y. Shan, L. Shang, D. L. Shen, X. Y. Shen, 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, G. S. Varner, D. Y. Wang, L. Wang, L. S. Wang, M. Wang, P. Wang, P. L. Wang, W. F. Wang, Y. F. Wang, Z. Wang, Z. Y. Wang, 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, M. H. Ye, Y. X. Ye, Z. Y. Yi, G. W. Yu, C. Z. Yuan, 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, Z. Q. Zhang, D. X. Zhao, J. W. Zhao, M. G. Zhao, P. P. Zhao, W. R. Zhao, Z. G. Zhao, H. Q. Zheng, 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, and B. S. Zou
Subjects: Physics, Nuclear and High Energy Physics, Amplitude, Nuclear magnetic resonance, Meson, Electron–positron annihilation, Partial wave analysis, Pi, Analytical chemistry, Particle identification, Bar (unit)
Abstract: A partial wave analysis of chi(c0)->pi(+)pi(-)K(+)K(-) in psi(2S)->gamma chi(c0) decay is presented using a sample of 14x10(6) psi(2S) events accumulated by the BES II detector. The data are fitted to the sum of relativistic covariant tensor amplitudes for intermediate resonant decay modes. From the fit, significant contributions to chi(c0) decays from the channels f(0)(980)f(0)(980), f(0)(980)f(0)(2200), f(0)(1370)f(0)(1710), K-*(892)(0)(K) over bar*(892)(0), K-0(*)(1430)(K) over bar (*)(0)(1430), K-0(*)(1430)(K) over bar (*)(2)(1430)+c.c., and K-1(1270)K are found. Flavor-SU(3)-violating K-1(1270)-K-1(1400) asymmetry is observed. Values obtained for the masses and widths of the resonances f(0)(1710), f(0)(2200), f(0)(1370), and K-0(*)(1430) are presented.
Published: 2005

373. Search forψ(3770)→ρπat the BESII detector at the Beijing Electron-Positron Collider

Author: X. B. Ma, W. R. Zhao, F. Liu, Y. N. Gao, H. L. Ma, S. M. Li, Fan Yang, Y. X. Yang, S. D. Gu, Xuai Zhuang, N. Wu, Y. Z. Sun, H. X. Yang, H. B. Li, C. L. Luo, Huirun Chen, Houbing Lu, J. P. Liu, C. C. Zhang, S. P. Chi, X. H. Mo, L. S. Wang, M. H. Ye, K. L. He, Z. Y. Ren, K. J. Zhu, J. M. Yuan, F. Lu, Y. T. Gu, Yingchun Zhu, H. H. Liu, J. C. Li, Z. Y. Yi, C. Z. Yuan, Zhe Wang, Z. Y. Zhang, H. S. Chen, D. H. Wei, Yu Zeng, Han-Qing Zheng, H. M. Hu, Qiyang Zhang, P. Wang, J. G. Lu, T. Hu, XZ（蔡翔舟） Cai, X. L. Li, Z. Y. Wang, Y. P. Chu, X. B. Ji, Lianyou Shan, Z. Z. Du, L. Y. Dong, R. Y. Li, Y. N. Guo, Cunfeng Wei, Q. F. Dong, Ning Zhou, J. W. Zhang, Zheng Wang, Shang Lunlin, X. Y. Zhang, G. Li, R. G. Liu, C. D. Fu, X. X. Xie, J. B. Liu, Z. Y. Deng, J. C. Chen, B.S. Zou, H. Y. Sheng, Z. Q. Tan, J. Fang, N. D. Qi, L. L. Ma, Z. J. Sun, Z. A. Liu, Zujian Wang, Jin Chen, Y. Ban, Fang Liu, S. S. Fang, J. Nie, J. Z. Bai, Xunchao Zhang, Y. S. Dai, C. S. Gao, M. G. Zhao, Jinxing Zheng, H. Y. Zhang, J. Y. Zhang, Y. Li, Y. K. Heng, Q. M. Zhu, X. Tang, Y. C. Xu, D. X. Zhao, P. P. Zhao, X. Q. Li, M. Z. Wang, H. S. Sun, B. Y. Zhang, Hangxu Li, Haiping Peng, H. Qin, X. T. Huang, G. Rong, X. Shi, Y. F. Liang, D. P. Jin, Miao He, D. H. Zhang, L. P. Zhou, Z. P. Mao, J. B. Jiao, Jiming Yang, Yang Tian, S. L. Zang, S. X. Du, M. L. Yan, B. X. Zhang, Z. P. Zheng, Q. M. Ma, Xiru Huang, Y. Yuan, Y. S. Zhu, G. L. Tong, M. Ablikim, B. A. Zhuang, Yudan Wang, G. R. Lu, Z. A. Zhu, Xingzhu Cui, Feng Shi, Jianwei Sun, X. Y. Shen, Hongbo Liao, D. L. Shen, Yiyun Zhang, C. X. Liu, S. S. Sun, J. G. Bian, Y. X. Ye, Y. Zeng, Y. Q. Guo, Y. B. Chen, Y. F. Lai, H. F. Chen, W. F. Wang, X. M. Xia, Yi Jin, F. C. Ma, X. S. Jiang, W. G. Li, G. F. Xu, D. Y. Wang, J. F. Qiu, H. M. Liu, S. Jin, Bo Xin, Y. C. Zhu, P. L. Wang, Z. P. Zhang, W. D. Li, J. W. Zhao, and G. W. Yu
Subjects: Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Branching fraction, Electron, law.invention, Pion, Positron, law, High Energy Physics::Experiment, Continuum (set theory), Collider, Energy (signal processing)
Abstract: Non-$D\overline{D}$ decay $\ensuremath{\psi}(3770)\ensuremath{\rightarrow}\ensuremath{\rho}\ensuremath{\pi}$ is searched for using a data sample of $(17.3\ifmmode\pm\else\textpm\fi{}0.5)\text{ }\text{ }\mathrm{p}{\mathrm{b}}^{\ensuremath{-}1}$ taken at the center-of-mass energy of 3.773 GeV by the BESII detector at the BEPC. No $\ensuremath{\rho}\ensuremath{\pi}$ signal is observed, and the upper limit of the cross section is measured to be $\ensuremath{\sigma}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\rho}\ensuremath{\pi})l6.0\text{ }\text{ }\mathrm{pb}$ at 90% C. L. Considering the interference between the continuum amplitude and the $\ensuremath{\psi}(3770)$ resonance amplitude, the branching fraction of $\ensuremath{\psi}(3770)$ decays to $\ensuremath{\rho}\ensuremath{\pi}$ is determined to be $\mathcal{B}(\ensuremath{\psi}(3770)\ensuremath{\rightarrow}\ensuremath{\rho}\ensuremath{\pi})\ensuremath{\in}(6.0\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},2.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3})$ at 90% C. L. This is in agreement with the prediction of the $S$- and $D$-wave mixing scheme of the charmonium states for solving the ``$\ensuremath{\rho}\ensuremath{\pi}$ puzzle'' between $J/\ensuremath{\psi}$ and $\ensuremath{\psi}(2S)$ decays.
Published: 2005

374. Experimental study ofηcdecays into vector-vector final states

Author: 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, L. Y. Dong, Q. F. Dong, S. X. Du, Z. Z. Du, J. Fang, S. S. Fang, 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. P. Huang, X. T. Huang, X. B. Ji, X. S. Jiang, J. B. Jiao, D. P. Jin, S. Jin, Yi Jin, Y. F. Lai, G. Li, H. B. Li, H. H. Li, J. Li, R. Y. Li, S. M. Li, W. D. Li, 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, J. P. Liu, R. G. Liu, Z. A. Liu, F. Lu, G. R. Lu, H. J. Lu, J. G. Lu, C. L. Luo, F. C. Ma, 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, N. D. Qi, H. Qin, J. F. Qiu, Z. Y. Ren, G. Rong, L. Y. Shan, L. Shang, D. L. Shen, X. Y. Shen, 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, G. S. Varner, D. Y. Wang, L. Wang, L. S. Wang, M. Wang, P. Wang, P. L. Wang, W. F. Wang, Y. F. Wang, Z. Wang, Z. Y. Wang, 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, M. H. Ye, Y. X. Ye, Z. Y. Yi, G. W. Yu, C. Z. Yuan, 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, Z. Q. Zhang, D. X. Zhao, J. W. Zhao, M. G. Zhao, P. P. Zhao, W. R. Zhao, Z. G. Zhao, H. Q. Zheng, 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, and B. S. Zou
Subjects: Physics, High Energy Physics - Experiment (hep-ex), Nuclear and High Energy Physics, Branching fraction, Analytical chemistry, FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment, Omega, Astrophysics::Galaxy Astrophysics, Particle identification, High Energy Physics - Experiment
Abstract: Using 58 million J/\psi events accumulated with the BES II detector, branching fractions for the \eta_{c} ->VV decays, \eta_{c} -> \rho \rho, \eta_{c} -> K^{*}{\bar K}^{*}, \eta_{c} -> \omega \omega, and \eta_{c} -> \phi \phi, are measured. The branching fractions are Br(\eta_{c} -> \rho \rho) = (1.25 \pm 0.37 \pm 0.51) \times 10^{-2}, Br(\eta_{c} -> \K^{*}{\bar K}^{*}) = (10.4 \pm 2.6\pm 4.3) \times 10^{-3}, Br(\eta_{c} -> \omega\omega) < 6.3 \times 10^{-3} (90 % CL), and Br(\eta_{c} -> \phi \phi) = (2.5 \pm 0.5 \pm 0.9) \times 10^{-3}. The process \eta_{c} -> \omega\phi is also searched for, and the 90% CL upper limit Br(eta_{c} -> \omega\phi) < 1.3 \times 10^{-3} is obtained for this process., Comment: 12pages,11figures,to be submitted to PRD
Published: 2005

375. Observation of a resonance in Chi(1835) in J/psi --gammapi+ pi- eta

Author: 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, L Y, Dong, Q F, Dong, S X, Du, Z Z, Du, J, Fang, S S, Fang, 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 P, Huang, X T, Huang, X B, Ji, X S, Jiang, J B, Jiao, D P, Jin, S, Jin, Yi, Jin, Y F, Lai, G, Li, H B, Li, H H, Li, J, Li, R Y, Li, S M, Li, W D, Li, 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, J P, Liu, R G, Liu, Z A, Liu, F, Lu, G R, Lu, H J, Lu, J G, Lu, C L, Luo, F C, Ma, 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, N D, Qi, H, Qin, J F, Qiu, Z Y, Ren, G, Rong, L Y, Shan, L, Shang, D L, Shen, X Y, Shen, 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, G S, Varner, D Y, Wang, L, Wang, L S, Wang, M, Wang, P, Wang, P L, Wang, W F, Wang, Y F, Wang, Z, Wang, Z Y, Wang, 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, M H, Ye, Y X, Ye, Z Y, Yi, G W, Yu, C Z, Yuan, 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, Y Y, Zhang, Z P, Zhang, Z Q, Zhang, D X, Zhao, J W, Zhao, M G, Zhao, P P, Zhao, W R, Zhao, Z G, Zhao, H Q, Zheng, J P, Zheng, Z P, Zheng, L, Zhou, N F, Zhou, K J, Zhu, Q M, Zhu, Y C, Zhu, Yingchun, Zhu, Y S, Zhu, Z A, Zhu, B A, Zhuang, X A, Zhuang, and B S, Zou
Abstract: The decay channel J/psi --gamma(pi)(+)pi(-)eta is analyzed using a sample of 5.8 x 10(7) J/psi events collected with the BESII detector. A resonance, the Chi(1835), is observed in the pi(+)pi(-)eta invariant-mass spectrum with a statistical significance of 7.7 sigma. A fit with a Breit-Wigner function yields a mass M = 1833.7 +/- 6.1(stat) +/- 2.7(syst) MeV/c(2), a width Tau = 67.7 +/- 20.3(stat) +/- 7.7(syst) MeV/c(2), and a product branching fraction B(J/psi --gammaChi) . B(Chi --pi(+)pi(-)eta) = [2.2 +/- 0.4(stat) +/- 0.4(syst)] x 10(-4). The mass and width of the Chi(1835) are not compatible with any known meson resonance. Its properties are consistent with expectations for the state that produces the strong pp mass threshold enhancement observed in the J/psi --gammapp process at BESII.
Published: 2005

376. Measurement of the branching fractions ofψ(2S)→3(π+π−)andJ/ψ→2(π+π−)

Author: X. S. Jiang, J. W. Zhao, G. W. Yu, Feng Shi, F. Lu, Z. J. Guo, Y. Zeng, Y. Q. Guo, Zheng Wang, J. F. Chang, Q. M. Zhu, H. X. Yang, H.S. Xu, Hongbo Liao, R. Y. Li, J. G. Lu, L. L. Ma, Yiyun Zhang, M. Z. Wang, S. Z. Wang, Bo Xin, Cunfeng Wei, Y. B. Chen, Q. F. Dong, Ning Zhou, Y. C. Zhu, Guangzhao Zhou, J. W. Zhang, W. D. Li, Y. X. Ye, H. S. Sun, X. Y. Zhang, Z. A. Liu, Y. F. Lai, Yingchun Zhu, J. Z. Wang, H. F. Chen, W. F. Wang, Haiping Peng, J. B. Zhao, J. C. Chen, Jin Chen, Z. P. Zheng, S. S. Fang, R. G. Liu, T. Hu, Y. P. Chu, Z. Y. Zhang, C. Z. Yuan, Y. F. Liang, J. P. Liu, P. L. Wang, X. B. Ji, J. B. Liu, Z. Y. Yi, S. L. Zang, X. Y. Shen, XZ（蔡翔舟） Cai, X. L. Li, D. P. Jin, Zhe Wang, J. Fang, L. S. Zheng, Xunchao Zhang, Y. Ban, Han-Qing Zheng, Fang Liu, Shang Lunlin, Qiyang Zhang, Z. Y. Ren, Y. Li, H. L. Dai, D. H. Zhang, P. P. Zhao, G. Li, C. S. Yu, Lianyou Shan, Yudan Wang, G. R. Lu, W. G. Li, L. S. Wang, Ke Wang, Xiru Huang, X. X. Xie, C. D. Fu, Z. A. Zhu, D. Y. Wang, M. G. Zhao, P. Wang, H. M. Hu, J. Nie, G. L. Tong, X. C. Zhong, Z. Y. Deng, F. A. Harris, X. L. Luo, N. Wu, Z. P. Zhang, M. Ablikim, B. A. Zhuang, H. M. Liu, L. H. Yi, D. X. Zhao, B. Y. Zhang, X. H. He, S. D. Gu, H. Y. Zhang, Q. J. Li, Y. S. Dai, C. S. Gao, F. Li, F. C. Ma, X. B. Ma, Xuai Zhuang, Jinxing Zheng, Hangxu Li, Jiemin Li, G. S. Huang, Yang Tian, Jianwei Sun, S. P. Chi, J. Y. Zhang, J. Z. Bai, G. S. Varner, Xingzhu Cui, K. J. Zhu, J. M. Yuan, Y. M. Wu, Q. M. Ma, Y. K. Heng, Y. Y. Zhang, J. F. Qiu, Jun Chen, Y. Yuan, Y. S. Zhu, Z. D. Nie, Miao He, S. X. Du, S. S. Sun, D. H. Wei, L. P. Zhou, M. L. Yan, Z. P. Mao, H. Y. Sheng, Huirun Chen, B. X. Zhang, Jiming Yang, N. D. Qi, X. H. Mo, Z. Z. Du, M. H. Ye, Juan Zhang, Z. X. Liu, Y. N. Guo, X. Tang, D. L. Shen, C. X. Liu, L. Y. Dong, M. Y. Gong, H. B. Li, C. L. Luo, X. M. Xia, Houbing Lu, H. Y. Fu, Nongjian Tao, C. C. Zhang, G. F. Xu, S. Jin, S. T. Xue, L. X. Luo, S. L. Olsen, Z. Y. Wang, M. L. Chen, Z. G. Zhao, Yu Zeng, Z. J. Sun, H. S. Chen, W. R. Zhao, H. H. Liu, J. C. Li, F. Liu, Chun-Hua Jiang, Zujian Wang, Y. N. Gao, Y. Jin, Y. B. Zhao, X. J. Zhao, B.S. Zou, K. L. He, X. T. Huang, G. Rong, J. G. Bian, H. L. Ma, S. M. Li, Fan Yang, Bing Zhou, Y. X. Yang, Yi Jin, S. Q. Zhang, C. D. Qian, Y. Z. Sun, X. Q. Li, H. Qin, Jun-Bing Ma, X. Y. Ma, W. X. Gong, and X. Shi
Subjects: Physics, Nuclear and High Energy Physics, Crystallography, Branching fraction, Form factor (quantum field theory), Branching (polymer chemistry), Particle identification
Abstract: Using data samples collected at {radical}(s)=3.686 GeV and 3.650 GeV by the BESII detector at the BEPC, the branching fraction of {psi}(2S){yields}3({pi}{sup +}{pi}{sup -}) is measured to be [5.45{+-}0.42(stat){+-}0.87(syst)]x10{sup -4}, and the relative branching fraction of J/{psi}{yields}2({pi}{sup +}{pi}{sup -}) to that of J/{psi}{yields}{mu}{sup +}{mu}{sup -} is measured to be [6.01{+-}0.20(stat){+-}0.48(syst)]% via {psi}(2S){yields}{pi}{sup +}{pi}{sup -}J/{psi},J/{psi}{yields}2({pi}{sup +}{pi}{sup -}). The electromagnetic form factor of 3({pi}{sup +}{pi}{sup -}) is determined to be 0.19{+-}0.02 and 0.24{+-}0.02 at {radical}(s)=3.650 GeV and 3.686 GeV, respectively.
Published: 2005

377. Precise measurement of spin-averagedχcJ(1P)mass using photon conversions inψ(2S)→γχcJ

Author: M. Ablikim, J. Z. Bai, Y. Ban, J. G. Bian, X. Cai, J. F. Chang, H. F. Chen, H. S. Chen, H. X. Chen, J. C. Chen, Jin Chen, Jun Chen, M. L. Chen, Y. B. Chen, S. P. Chi, Y. P. Chu, X. Z. Cui, H. L. Dai, Y. S. Dai, Z. Y. Deng, L. Y. Dong, Q. F. Dong, S. X. Du, Z. Z. Du, J. Fang, S. S. Fang, C. D. Fu, H. Y. Fu, C. S. Gao, Y. N. Gao, M. Y. Gong, W. X. Gong, S. D. Gu, Y. N. Guo, Y. Q. Guo, Z. J. Guo, F. A. Harris, K. L. He, M. He, X. He, Y. K. Heng, H. M. Hu, T. Hu, G. S. Huang, X. P. Huang, X. T. Huang, X. B. Ji, C. H. Jiang, X. S. Jiang, D. P. Jin, S. Jin, Y. Jin, Yi Jin, Y. F. Lai, F. Li, G. Li, H. H. Li, J. Li, J. C. Li, Q. J. Li, R. Y. Li, S. M. Li, W. D. Li, 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, J. P. Liu, R. G. Liu, Z. A. Liu, Z. X. Liu, F. Lu, G. R. Lu, H. J. Lu, J. G. Lu, C. L. Luo, L. X. Luo, X. L. Luo, F. C. Ma, H. L. Ma, J. M. Ma, L. L. Ma, Q. M. Ma, X. B. Ma, X. Y. Ma, Z. P. Mao, X. H. Mo, J. Nie, Z. D. Nie, S. L. Olsen, H. P. Peng, N. D. Qi, C. D. Qian, H. Qin, J. F. Qiu, Z. Y. Ren, G. Rong, L. Y. Shan, L. Shang, D. L. Shen, X. Y. Shen, H. Y. Sheng, F. Shi, X. Shi, H. S. Sun, J. F. Sun, S. S. Sun, Y. Z. Sun, Z. J. Sun, X. Tang, N. Tao, Y. R. Tian, G. L. Tong, G. S. Varner, D. Y. Wang, J. Z. Wang, K. Wang, L. Wang, L. S. Wang, M. Wang, P. Wang, P. L. Wang, S. Z. Wang, W. F. Wang, Y. F. Wang, Z. Wang, Z. Y. Wang, Zhe Wang, Zheng Wang, C. L. Wei, D. H. Wei, N. Wu, Y. M. Wu, X. M. Xia, X. X. Xie, B. Xin, G. F. Xu, H. Xu, S. T. Xue, M. L. Yan, F. Yang, H. X. Yang, J. Yang, Y. X. Yang, M. Ye, M. H. Ye, Y. X. Ye, L. H. Yi, Z. Y. Yi, C. S. Yu, G. W. Yu, C. Z. Yuan, 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. Zhang, J. W. Zhang, J. Y. Zhang, Q. J. Zhang, S. Q. Zhang, X. M. Zhang, X. Y. Zhang, Y. Y. Zhang, Yiyun Zhang, Z. P. Zhang, Z. Q. Zhang, D. X. Zhao, J. B. Zhao, J. W. Zhao, M. G. Zhao, P. P. Zhao, W. R. Zhao, X. J. Zhao, Y. B. Zhao, Z. G. Zhao, H. Q. Zheng, J. P. Zheng, L. S. Zheng, Z. P. Zheng, X. C. Zhong, B. Q. Zhou, G. M. Zhou, 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, and B. S. Zou
Subjects: Physics, Nuclear and High Energy Physics, Crystallography, Antiparticle, Particle physics, Particle decay, Meson, Electron–positron annihilation, Hadron, Elementary particle, Photon energy, Spectral line
Abstract: Using photon conversions to e{sup +}e{sup -} pairs, the energy spectrum of inclusive photons from {psi}(2S) radiative decays is measured with photon energy resolution ({sigma}{sub E{sub {gamma}}}) in the range from 2.3 to 3.8 MeV by BESII at the Beijing Electron-Positron Collider. The {chi}{sub cJ}(1P) states (J=0,1,2) are clearly observed, and their masses and the spin-averaged {chi}{sub cJ} mass are determined to be M{sub {chi}{sub c}{sub 0}}=3414.21{+-}0.39{+-}0.27, M{sub {chi}{sub c}{sub 1}}=3510.30{+-}0.14{+-}0.16, M{sub {chi}{sub c}{sub 2}}=3555.70{+-}0.59{+-}0.39, and M({sup 3}P{sub cog})=3524.85{+-}0.32{+-}0.30 MeV/c{sup 2}, respectively.
Published: 2005

378. Observation ofpp¯π0andpp¯ηinψ′decays

Author: Fang Liu, Y. Jin, C. L. Luo, L. L. Ma, D. X. Zhao, B. Y. Zhang, Hangxu Li, Houbing Lu, Nongjian Tao, C. C. Zhang, B.S. Zou, Z. A. Liu, Jiemin Li, Y. Ban, L. X. Luo, J. P. Liu, H. L. Dai, Xingzhu Cui, Miao He, J. Z. Bai, Q. M. Zhu, S. S. Sun, S. T. Xue, L. P. Zhou, X. M. Xia, M. Z. Wang, Z. P. Mao, Feng Shi, Chun-Hua Jiang, Y. Zeng, H. S. Sun, K. L. He, S. P. Chi, Zujian Wang, X. B. Ma, Xuai Zhuang, W. R. Zhao, W. G. Li, Y. Q. Guo, H. Y. Fu, Haiping Peng, Z. Z. Du, F. Liu, Yingchun Zhu, K. J. Zhu, S. L. Zang, Y. B. Chen, D. Y. Wang, J. M. Yuan, F. Lu, Guangzhao Zhou, Z. X. Liu, Q. J. Li, Z. Y. Yi, Y. F. Lai, B. X. Zhang, S. L. Olsen, S. D. Gu, G. F. Xu, Shang Lunlin, H. M. Liu, H. F. Chen, S. Jin, Z. Y. Wang, Yi Jin, G. Li, Y. N. Gao, H. H. Liu, W. F. Wang, Y. Li, J. C. Li, Ke Wang, Y. B. Zhao, Z. P. Zheng, N. Wu, J. Nie, C. D. Fu, X. J. Zhao, Z. Y. Deng, J. B. Zhao, D. H. Wei, Xiru Huang, Z. D. Nie, H. Y. Sheng, G. S. Varner, Y. S. Dai, S. Z. Wang, C. S. Gao, Bo Xin, Jinxing Zheng, G. L. Tong, Q. M. Ma, N. D. Qi, M. Ablikim, B. A. Zhuang, M. L. Chen, X. Y. Shen, F. Li, Jun Chen, W. D. Li, C. D. Qian, Jianwei Sun, H. S. Chen, Y. M. Wu, C. Z. Yuan, Z. G. Zhao, X. H. He, Yudan Wang, Yu Zeng, Huirun Chen, Y. Yuan, Y. S. Zhu, G. R. Lu, Y. P. Chu, F. C. Ma, D. L. Shen, X. B. Ji, Zhe Wang, Jiming Yang, C. X. Liu, J. G. Lu, L. H. Yi, Z. J. Sun, Z. A. Zhu, P. P. Zhao, H. X. Yang, H.S. Xu, Qiyang Zhang, T. Hu, X. H. Mo, L. S. Wang, J. W. Zhao, XZ（蔡翔舟） Cai, X. L. Li, J. F. Qiu, G. W. Yu, Z. Y. Zhang, Jin Chen, J. Z. Wang, P. Wang, Han-Qing Zheng, H. L. Ma, Z. Y. Ren, Lianyou Shan, M. H. Ye, Y. F. Liang, X. T. Huang, G. Rong, D. P. Jin, S. M. Li, Fan Yang, H. M. Hu, X. C. Zhong, S. S. Fang, J. F. Chang, Hongbo Liao, X. Y. Zhang, Y. C. Zhu, R. G. Liu, J. B. Liu, D. H. Zhang, C. S. Yu, P. L. Wang, Yiyun Zhang, F. A. Harris, Y. X. Ye, J. G. Bian, Z. P. Zhang, X. S. Jiang, L. Y. Dong, Bing Zhou, Y. X. Yang, X. L. Luo, S. Q. Zhang, Y. Z. Sun, X. X. Xie, R. Y. Li, X. Q. Li, H. Qin, Cunfeng Wei, Q. F. Dong, Jun-Bing Ma, Ning Zhou, X. Y. Ma, W. X. Gong, X. Shi, J. W. Zhang, X. Tang, H. Y. Zhang, G. S. Huang, J. Y. Zhang, Y. K. Heng, Y. Y. Zhang, Zheng Wang, Z. J. Guo, J. C. Chen, J. Fang, L. S. Zheng, Xunchao Zhang, M. Y. Gong, M. G. Zhao, Juan Zhang, Y. N. Guo, Yang Tian, S. X. Du, and M. L. Yan
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Branching fraction
Abstract: The processes ${\ensuremath{\psi}}^{\ensuremath{'}}\ensuremath{\rightarrow}p\overline{p}{\ensuremath{\pi}}^{0}$ and ${\ensuremath{\psi}}^{\ensuremath{'}}\ensuremath{\rightarrow}p\overline{p}\ensuremath{\eta}$ are studied using a sample of $14\ifmmode\times\else\texttimes\fi{}{10}^{6}$ ${\ensuremath{\psi}}^{\ensuremath{'}}$ decays collected with the Beijing Spectrometer at the Beijing Electron-Positron Collider. The branching fraction of ${\ensuremath{\psi}}^{\ensuremath{'}}\ensuremath{\rightarrow}p\overline{p}{\ensuremath{\pi}}^{0}$ is measured with improved precision as $(13.2\ifmmode\pm\else\textpm\fi{}1.0\ifmmode\pm\else\textpm\fi{}1.5)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, and ${\ensuremath{\psi}}^{\ensuremath{'}}\ensuremath{\rightarrow}p\overline{p}\ensuremath{\eta}$ is observed for the first time with a branching fraction of $(5.8\ifmmode\pm\else\textpm\fi{}1.1\ifmmode\pm\else\textpm\fi{}0.7)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, where the first errors are statistical and the second ones are systematic.
Published: 2005

379. Measurements ofJ/ψdecays intoϕπ0,ϕη, andϕη′

Author: Ke Wang, Xunchao Zhang, J. Nie, Q. M. Ma, H. S. Chen, Y. S. Dai, C. S. Gao, Y. Yuan, Y. S. Zhu, L. S. Wang, Jinxing Zheng, X. H. He, M. G. Zhao, Miao He, H. L. Ma, S. M. Li, Fan Yang, Y. B. Zhao, L. P. Zhou, X. J. Zhao, Yudan Wang, L. H. Yi, G. R. Lu, H. X. Yang, H.S. Xu, Z. P. Mao, S. Z. Wang, Bing Zhou, Q. M. Zhu, J. G. Bian, F. Li, L. L. Ma, S. D. Gu, D. L. Shen, Z. A. Zhu, C. X. Liu, J. W. Zhao, M. H. Ye, Zheng Wang, M. Z. Wang, H. H. Liu, J. C. Li, F. C. Ma, Shang Lunlin, G. W. Yu, K. L. He, Jin Chen, Z. A. Liu, Y. M. Wu, J. P. Liu, W. R. Zhao, H. S. Sun, Fang Liu, F. Liu, Haiping Peng, G. Li, S. L. Zang, F. Lu, X. Y. Zhang, S. S. Fang, J. G. Lu, Z. D. Nie, Y. Ban, R. G. Liu, Jun-Bing Ma, L. Y. Dong, Z. Y. Ren, J. B. Liu, M. L. Chen, D. X. Zhao, C. D. Fu, G. S. Varner, J. C. Chen, Y. N. Gao, Yang Tian, B. Y. Zhang, Hangxu Li, X. Y. Ma, N. Wu, Jun Chen, T. Hu, XZ（蔡翔舟） Cai, Jiemin Li, Yingchun Zhu, X. L. Li, W. G. Li, P. P. Zhao, Feng Shi, Yu Zeng, Y. Jin, Xingzhu Cui, S. X. Du, B. X. Zhang, Z. Y. Deng, D. Y. Wang, W. X. Gong, X. M. Xia, M. L. Yan, J. Fang, Bo Xin, S. T. Xue, X. B. Ma, Xuai Zhuang, L. S. Zheng, Guangzhao Zhou, J. Z. Wang, Z. Y. Zhang, H. L. Dai, J. Z. Bai, Lianyou Shan, Y. F. Liang, H. Y. Fu, Z. J. Guo, Chun-Hua Jiang, S. S. Sun, C. Z. Yuan, W. D. Li, Y. X. Yang, H. Y. Zhang, Zhe Wang, X. Shi, Z. Y. Yi, Y. Zeng, Han-Qing Zheng, J. F. Qiu, Z. P. Zheng, H. M. Liu, Y. Q. Guo, J. B. Zhao, S. L. Olsen, Zujian Wang, Qiyang Zhang, S. P. Chi, D. P. Jin, Juan Zhang, Y. B. Chen, Z. Y. Wang, H. M. Hu, X. C. Zhong, G. S. Huang, J. F. Chang, G. F. Xu, Q. J. Li, X. T. Huang, Y. F. Lai, H. F. Chen, W. F. Wang, Hongbo Liao, Y. Li, S. Jin, P. Wang, K. J. Zhu, J. M. Yuan, X. Q. Li, S. Q. Zhang, Y. N. Guo, D. H. Zhang, C. S. Yu, G. Rong, Z. Z. Du, D. H. Wei, X. X. Xie, X. Y. Shen, J. Y. Zhang, X. Tang, Huirun Chen, B.S. Zou, Yiyun Zhang, C. L. Luo, Y. Z. Sun, R. Y. Li, Houbing Lu, Y. C. Zhu, Xiru Huang, Y. X. Ye, H. Qin, X. H. Mo, X. L. Luo, M. Y. Gong, Y. P. Chu, X. S. Jiang, Z. X. Liu, X. B. Ji, Nongjian Tao, C. C. Zhang, Cunfeng Wei, P. L. Wang, Q. F. Dong, Ning Zhou, G. L. Tong, J. W. Zhang, F. A. Harris, Y. K. Heng, Z. P. Zhang, M. Ablikim, B. A. Zhuang, L. X. Luo, Y. Y. Zhang, Yi Jin, Jianwei Sun, Z. G. Zhao, Jiming Yang, Z. J. Sun, C. D. Qian, H. Y. Sheng, and N. D. Qi
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Form factor (quantum field theory), High Energy Physics::Experiment, Nuclear Experiment, Omega
Abstract: Based on $5.8\ifmmode\times\else\texttimes\fi{}{10}^{7}J/\ensuremath{\psi}$ events collected with BESII at the Beijing Electron-Positron Collider (BEPC), the decay branching fractions of $J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\omega}{\ensuremath{\pi}}^{0}$, $\ensuremath{\omega}\ensuremath{\eta}$, and $\ensuremath{\omega}{\ensuremath{\eta}}^{\ensuremath{'}}$ are measured using different $\ensuremath{\eta}$ and ${\ensuremath{\eta}}^{\ensuremath{'}}$ decay modes. The results are higher than previous measurements. The $\ensuremath{\omega}{\ensuremath{\pi}}^{0}$ electromagnetic form factor is also obtained.
Published: 2005

380. Publisher's Note: Measurement of the final statesωπ0,pη, andpη′fromψ(2S)electromagnetic decays ande+e-annihilations [Phys. Rev. D 70, 112007 (2004)]

Author: Houbing Lu, Nongjian Tao, C. C. Zhang, X. Tang, R. Y. Li, Y. B. Zhao, Xunchao Zhang, X. J. Zhao, L. X. Luo, H. L. Ma, S. M. Li, Fan Yang, X. B. Ma, Xuai Zhuang, Cunfeng Wei, Q. F. Dong, Ning Zhou, Bing Zhou, M. Y. Gong, J. W. Zhang, L. S. Wang, M. G. Zhao, X. S. Jiang, B. X. Zhang, S. T. Xue, Ke Wang, Y. X. Yang, Z. P. Zheng, F. Li, F. C. Ma, Qiyang Zhang, Yudan Wang, W. G. Li, S. Q. Zhang, Xiru Huang, G. L. Tong, M. Ablikim, B. A. Zhuang, Miao He, J. Nie, H. Y. Zhang, B.S. Zou, Juan Zhang, Z. J. Guo, Y. Z. Sun, D. L. Shen, S. D. Gu, G. R. Lu, Jianwei Sun, M. H. Ye, L. P. Zhou, Y. N. Guo, Jiming Yang, J. F. Qiu, Yi Jin, C. X. Liu, G. S. Huang, P. Wang, Z. P. Mao, Z. A. Zhu, S. L. Olsen, C. D. Qian, D. Y. Wang, J. Y. Zhang, Y. S. Dai, Z. D. Nie, Z. Z. Du, Z. Y. Wang, Yingchun Zhu, L. Y. Dong, Y. M. Wu, C. S. Gao, W. R. Zhao, F. Liu, G. S. Varner, Y. P. Chu, X. B. Ji, Jinxing Zheng, Z. X. Liu, G. F. Xu, Y. K. Heng, Y. Y. Zhang, J. G. Lu, Zheng Wang, Bo Xin, H. S. Chen, S. Jin, X. Q. Li, Y. N. Gao, S. L. Zang, Feng Shi, Yang Tian, W. D. Li, T. Hu, Z. Y. Yi, H. M. Liu, F. Lu, Shang Lunlin, J. G. Bian, XZ（蔡翔舟） Cai, Jun Chen, X. Y. Zhang, L. L. Ma, R. G. Liu, Q. M. Ma, Chun-Hua Jiang, X. L. Li, J. B. Liu, Guangzhao Zhou, Y. C. Zhu, M. L. Chen, Huirun Chen, P. L. Wang, Q. M. Zhu, Z. A. Liu, Y. Yuan, Y. S. Zhu, G. Li, Y. Jin, J. C. Chen, S. X. Du, X. H. He, Y. Zeng, J. F. Chang, Hongbo Liao, Y. Li, Zujian Wang, Y. Q. Guo, Y. Ban, P. P. Zhao, J. B. Zhao, M. Z. Wang, M. L. Yan, F. A. Harris, Yiyun Zhang, C. D. Fu, Z. Y. Zhang, J. Fang, Lianyou Shan, H. Qin, L. S. Zheng, H. S. Sun, J. W. Zhao, H. X. Yang, H.S. Xu, Yu Zeng, Z. P. Zhang, Y. B. Chen, Y. X. Ye, Haiping Peng, G. W. Yu, X. H. Mo, Han-Qing Zheng, X. T. Huang, X. Y. Shen, X. C. Zhong, J. Z. Bai, G. Rong, C. Z. Yuan, X. M. Xia, Z. Y. Deng, Zhe Wang, H. M. Hu, J. P. Liu, H. Y. Fu, K. L. He, J. Z. Wang, Y. F. Lai, H. Y. Sheng, H. L. Dai, Z. Y. Ren, N. D. Qi, Y. F. Liang, D. P. Jin, H. F. Chen, W. F. Wang, L. H. Yi, D. H. Zhang, C. S. Yu, Q. J. Li, S. P. Chi, D. H. Wei, K. J. Zhu, J. M. Yuan, Jun-Bing Ma, X. Y. Ma, W. X. Gong, X. Shi, Fang Liu, D. X. Zhao, B. Y. Zhang, Hangxu Li, Jiemin Li, Xingzhu Cui, H. H. Liu, J. C. Li, Z. G. Zhao, S. S. Sun, Z. J. Sun, N. Wu, X. X. Xie, S. Z. Wang, Jin Chen, S. S. Fang, X. L. Luo, and C. L. Luo
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, Center of mass, Omega, Prime (order theory)
Abstract: Cross sections and form factors for $\ee \to \wpi$, $\rho\eta$, and $\rho\etap$ at center of mass energies of 3.650, 3.686, and 3.773 GeV are measured using data samples collected with the BESII detector at the BEPC. Also, the branching fractions of $\psi(2S) \rar \wpi$, $\rho\eta$, and $\rho\etap$ are determined to be $(1.87^{+0.68}_{-0.62}\pm0.28)\times 10^{-5}$, $(1.78^{+0.67}_{-0.62}\pm0.17)\times 10^{-5}$, and $(1.87^{+1.64}_{-1.11}\pm0.33)\times10^{-5}$, respectively.
Published: 2005

381. Electron acoustic imaging of BaTiO3single crystals

Author: Seiji Kojima, B. Y. Zhang, Qiuyun Yin, Yong Yang, and F. M. Jiang
Subjects: Materials science, Scanning electron microscope, business.industry, General Physics and Astronomy, Mineralogy, Acoustic microscopy, Electron, Signal, Ferroelectricity, Piezoelectricity, chemistry.chemical_compound, Optics, chemistry, Nondestructive testing, Barium titanate, business
Abstract: Scanning electron acoustic microscopy (SEAM) has been used in the observation of ferroelectric domain configurations in barium titanate single crystals. The contribution to the image contrasts is related to signal generation through a piezoelectric coupling mechanism. The results prove that SEAM really has the ability to show not only the surface shape and domain structures but also the subsurface domain structures. Furthermore, SEAM is a convenient, fast and nondestructive way of observing the ferroelectric domains compared with other methods.
Published: 1996

382. First measurement of the branching fraction ofJ/ψ→γf2(1270)f2(1270)

Author: M. Ablikim, J. Z. Bai, Y. Ban, J. G. Bian, X. Cai, J. F. Chang, H. F. Chen, H. S. Chen, H. X. Chen, J. C. Chen, Jin Chen, Jun Chen, M. L. Chen, Y. B. Chen, S. P. Chi, Y. P. Chu, X. Z. Cui, H. L. Dai, Y. S. Dai, Z. Y. Deng, L. Y. Dong, Q. F. Dong, S. X. Du, Z. Z. Du, J. Fang, S. S. Fang, C. D. Fu, H. Y. Fu, C. S. Gao, Y. N. Gao, M. Y. Gong, W. X. Gong, S. D. Gu, Y. N. Guo, Y. Q. Guo, Z. J. Guo, F. A. Harris, K. L. He, M. He, X. He, Y. K. Heng, H. M. Hu, T. Hu, G. S. Huang, X. P. Huang, X. T. Huang, X. B. Ji, C. H. Jiang, X. S. Jiang, D. P. Jin, S. Jin, Y. Jin, Yi Jin, Y. F. Lai, F. Li, G. Li, H. H. Li, J. Li, J. C. Li, Q. J. Li, R. Y. Li, S. M. Li, W. D. Li, 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, J. P. Liu, R. G. Liu, Z. A. Liu, Z. X. Liu, F. Lu, G. R. Lu, H. J. Lu, J. G. Lu, C. L. Luo, L. X. Luo, X. L. Luo, F. C. Ma, H. L. Ma, J. M. Ma, L. L. Ma, Q. M. Ma, X. B. Ma, X. Y. Ma, Z. P. Mao, X. H. Mo, J. Nie, Z. D. Nie, S. L. Olsen, H. P. Peng, N. D. Qi, C. D. Qian, H. Qin, J. F. Qiu, Z. Y. Ren, G. Rong, L. Y. Shan, L. Shang, D. L. Shen, X. Y. Shen, H. Y. Sheng, F. Shi, X. Shi, H. S. Sun, J. F. Sun, S. S. Sun, Y. Z. Sun, Z. J. Sun, X. Tang, N. Tao, Y. R. Tian, G. L. Tong, G. S. Varner, D. Y. Wang, J. Z. Wang, K. Wang, L. Wang, L. S. Wang, M. Wang, P. Wang, P. L. Wang, S. Z. Wang, W. F. Wang, Y. F. Wang, Z. Wang, Z. Y. Wang, Zhe Wang, Zheng Wang, C. L. Wei, D. H. Wei, N. Wu, Y. M. Wu, X. M. Xia, X. X. Xie, B. Xin, G. F. Xu, H. Xu, S. T. Xue, M. L. Yan, F. Yang, H. X. Yang, J. Yang, Y. X. Yang, M. Ye, M. H. Ye, Y. X. Ye, L. H. Yi, Z. Y. Yi, C. S. Yu, G. W. Yu, C. Z. Yuan, 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. Zhang, J. W. Zhang, J. Y. Zhang, Q. J. Zhang, S. Q. Zhang, X. M. Zhang, X. Y. Zhang, Y. Y. Zhang, Yiyun Zhang, Z. P. Zhang, Z. Q. Zhang, D. X. Zhao, J. B. Zhao, J. W. Zhao, M. G. Zhao, P. P. Zhao, W. R. Zhao, X. J. Zhao, Y. B. Zhao, Z. G. Zhao, H. Q. Zheng, J. P. Zheng, L. S. Zheng, Z. P. Zheng, X. C. Zhong, B. Q. Zhou, G. M. Zhou, 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, and B. S. Zou.
Subjects: Physics, Nuclear and High Energy Physics, Particle decay, Positron, Branching fraction, law, Electron–positron annihilation, Analytical chemistry, Electron, Collider, Particle identification, law.invention
Abstract: Using 58 million J/psi events taken with the BES II detector at the Beijing Electron Positron Collider, the decay J/psi-->gammaf(2)(1270)f(2)(1270)-->gammapi(+)pi(-)pi(+)pi(-) is observed, and the branching fraction Br(J/psi-->gammaf(2)f(2))=(9.5+/-0.7+/-1.6)x10(-4) is measured for the first time, where the quoted errors are statistical and systematic, respectively. The branching fraction of J/psi-->gammaeta(c), eta(c)-->f(2)f(2) is also measured to be Br(J/psi-->gammaeta(c)).Br(eta(c)-->f(2)f(2))=(1.3+/-0.3(-0.4)(+0.3))x10(-4). The nonresonant branching fraction of J/psi-->gammaf(2)f(2) is Br(J/psi-->gammaf(2)f(2))=(8.2+/-0.8+/-1.7)x10(-4).
Published: 2004

383. Measurement of the final statesωπ0,ρη, andρη′fromψ(2S)electromagnetic decays ande+e−annihilations

Author: M. Ablikim, J. Z. Bai, Y. Ban, J. G. Bian, X. Cai, J. F. Chang, H. F. Chen, H. S. Chen, H. X. Chen, J. C. Chen, Jin Chen, Jun Chen, M. L. Chen, Y. B. Chen, S. P. Chi, Y. P. Chu, X. Z. Cui, H. L. Dai, Y. S. Dai, Z. Y. Deng, L. Y. Dong, Q. F. Dong, S. X. Du, Z. Z. Du, J. Fang, S. S. Fang, C. D. Fu, H. Y. Fu, C. S. Gao, Y. N. Gao, M. Y. Gong, W. X. Gong, S. D. Gu, Y. N. Guo, Y. Q. Guo, Z. J. Guo, F. A. Harris, K. L. He, M. He, X. He, Y. K. Heng, H. M. Hu, T. Hu, G. S. Huang, X. P. Huang, X. T. Huang, X. B. Ji, C. H. Jiang, X. S. Jiang, D. P. Jin, S. Jin, Y. Jin, Yi Jin, Y. F. Lai, F. Li, G. Li, H. H. Li, J. Li, J. C. Li, Q. J. Li, R. Y. Li, S. M. Li, W. D. Li, 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, J. P. Liu, R. G. Liu, Z. A. Liu, Z. X. Liu, F. Lu, G. R. Lu, H. J. Lu, J. G. Lu, C. L. Luo, L. X. Luo, X. L. Luo, F. C. Ma, H. L. Ma, J. M. Ma, L. L. Ma, Q. M. Ma, X. B. Ma, X. Y. Ma, Z. P. Mao, X. H. Mo, J. Nie, Z. D. Nie, S. L. Olsen, H. P. Peng, N. D. Qi, C. D. Qian, H. Qin, J. F. Qiu, Z. Y. Ren, G. Rong, L. Y. Shan, L. Shang, D. L. Shen, X. Y. Shen, H. Y. Sheng, F. Shi, X. Shi, H. S. Sun, J. F. Sun, S. S. Sun, Y. Z. Sun, Z. J. Sun, X. Tang, N. Tao, Y. R. Tian, G. L. Tong, G. S. Varner, D. Y. Wang, J. Z. Wang, K. Wang, L. Wang, L. S. Wang, M. Wang, P. Wang, P. L. Wang, S. Z. Wang, W. F. Wang, Y. F. Wang, Z. Wang, Z. Y. Wang, Zhe Wang, Zheng Wang, C. L. Wei, D. H. Wei, N. Wu, Y. M. Wu, X. M. Xia, X. X. Xie, B. Xin, G. F. Xu, H. Xu, S. T. Xue, M. L. Yan, F. Yang, H. X. Yang, J. Yang, Y. X. Yang, M. Ye, M. H. Ye, Y. X. Ye, L. H. Yi, Z. Y. Yi, C. S. Yu, G. W. Yu, C. Z. Yuan, 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. Zhang, J. W. Zhang, J. Y. Zhang, Q. J. Zhang, S. Q. Zhang, X. M. Zhang, X. Y. Zhang, Y. Y. Zhang, Yiyun Zhang, Z. P. Zhang, Z. Q. Zhang, D. X. Zhao, J. B. Zhao, J. W. Zhao, M. G. Zhao, P. P. Zhao, W. R. Zhao, X. J. Zhao, Y. B. Zhao, Z. G. Zhao, H. Q. Zheng, J. P. Zheng, L. S. Zheng, Z. P. Zheng, X. C. Zhong, B. Q. Zhou, G. M. Zhou, 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, and B. S. Zou
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Annihilation, Positron, Branching fraction, Pi, Omega, Particle identification
Abstract: Cross sections and form factors for e(+)e(-)-->omegapi(0), rhoeta, and rhoeta(') at center of mass energies of 3.650, 3.686, and 3.773 GeV are measured using data samples collected with the BESII detector at the BEPC. Also, the branching fractions of psi(2S)-->omegapi(0), rhoeta, and rhoeta(') are determined to be (1.87(-0.62)(+0.68)+/-0.28)x10(-5), (1.78(-0.62)(+0.67)+/-0.17)x10(-5), and (1.87(-1.11)(+1.64)+/-0.33)x10(-5), respectively.
Published: 2004

384. Measurements ofψ(2S)decays intoϕπ0,ϕη,ϕη′,ωη, andωη′

Author: Feng Shi, Y. Jin, J. G. Lu, M. L. Chen, Guangzhao Zhou, T. Hu, XZ（蔡翔舟） Cai, X. L. Li, G. F. Xu, X. Tang, J. B. Zhao, S. Jin, Yu Zeng, Xingzhu Cui, Y. J. Zhang, X. Y. Shen, Lianyou Shan, Z. Z. Du, Zheng Wang, S. S. Sun, X. C. Zhong, Z. X. Liu, W. R. Zhao, S. D. Gu, Q. Yue, Q. J. Li, F. Liu, S. T. Xue, F. Lu, Z. J. Guo, N. Wu, H. S. Chen, Jiming Yang, J. C. Chen, Y. N. Gao, M. Y. Gong, D. H. Wei, Fang Liu, M. H. Ye, G. S. Varner, Qingying Jia, X. Y. Zhang, R. G. Liu, J. W. Zhao, Y. B. Zhao, S. L. Olsen, X. J. Zhao, J. Fang, J. B. Liu, L. S. Zheng, G. W. Yu, H. Y. Sheng, Yudan Wang, D. X. Zhao, B. Y. Zhang, Z. Y. Wang, L. Y. Dong, Y. X. Yang, Hangxu Li, Jiemin Li, F. Li, Jun Chen, Xunchao Zhang, C. Z. Yuan, G. R. Lu, N. D. Qi, R. B. Li, D. L. Shen, Zhe Wang, Juan Zhang, Yingchun Zhu, Z. A. Zhu, Y. M. Wu, L. L. Ma, S. Q. Zhang, Z. A. Liu, L. H. Yi, F. C. Ma, Shang Lunlin, W. G. Li, Y. N. Guo, G. Li, Y. Ban, C. X. Liu, L. S. Wang, Y. Z. Sun, K. L. He, Z. Y. Zhang, M. G. Zhao, Qiyang Zhang, D. Y. Wang, Z. Y. Yi, Bo Xin, Yang Tian, Han-Qing Zheng, J. F. Qiu, J. Z. Bai, P. Wang, H. M. Liu, S. X. Du, H. Y. Zhang, H. M. Hu, G. S. Huang, M. L. Yan, X. M. Xia, Huirun Chen, H. Y. Fu, J. Y. Zhang, H. X. Yang, H.S. Xu, Y. Zeng, C. D. Fu, Z. Y. Deng, Y. Q. Guo, S. M. Li, Fan Yang, Q. M. Ma, Y. C. Zhu, P. L. Wang, J. G. Bian, Y. B. Chen, X. H. Mo, Y. F. Lai, Y. Yuan, Y. S. Zhu, B. X. Zhang, H. F. Chen, Bing Zhou, Z. P. Zheng, Y. K. Heng, Y. Y. Zhang, W. F. Wang, J. P. Liu, F. A. Harris, Z. P. Zhang, Z. Y. Ren, Xiru Huang, G. L. Tong, M. Ablikim, B. A. Zhuang, Y. P. Chu, B.S. Zou, X. B. Ji, P. P. Zhao, Lei Zhang, S. P. Chi, J. C. Li, G. Rong, K. J. Zhu, J. M. Yuan, C. D. Qian, Chun-Hua Jiang, Zujian Wang, C. L. Luo, Nongjian Tao, C. C. Zhang, Z. G. Zhao, L. Huang, Z. J. Sun, R. Y. Li, Cunfeng Wei, Ning Zhou, J. W. Zhang, Z. D. Nie, J. F. Chang, Hongbo Liao, X. H. He, S. L. Zang, Yiyun Zhang, J. Z. Wang, Y. F. Liang, D. P. Jin, X. L. Luo, D. H. Zhang, C. S. Yu, Y. X. Ye, Miao He, S. D. Yang, X. S. Jiang, L. P. Zhou, Z. P. Mao, H. L. Dai, Ke Wang, J. Nie, Y. S. Dai, C. S. Gao, Jinxing Zheng, Q. M. Zhu, Y. C. Xu, M. Z. Wang, H. S. Sun, Haiping Peng, Xintong Li, X. X. Xie, S. Z. Wang, Jin Chen, S. S. Fang, Jun-Bing Ma, X. Y. Ma, W. X. Gong, X. Shi, X. Q. Li, and H. Qin
Subjects: Physics, Nuclear and High Energy Physics, Particle physics
Published: 2004

385. Measurement of theχc2polarization inψ(2S)→γχc2

Author: M. Ablikim, J. Z. Bai, Y. Ban, J. G. Bian, X. Cai, J. F. Chang, H. F. Chen, H. S. Chen, H. X. Chen, J. C. Chen, Jin Chen, Jun Chen, M. L. Chen, Y. B. Chen, S. P. Chi, Y. P. Chu, X. Z. Cui, H. L. Dai, Y. S. Dai, Z. Y. Deng, L. Y. Dong, S. X. Du, Z. Z. Du, J. Fang, S. S. Fang, C. D. Fu, H. Y. Fu, C. S. Gao, Y. N. Gao, M. Y. Gong, W. X. Gong, S. D. Gu, Y. N. Guo, Y. Q. Guo, Z. J. Guo, F. A. Harris, K. L. He, M. He, X. He, Y. K. Heng, H. M. Hu, T. Hu, G. S. Huang, L. Huang, X. P. Huang, X. B. Ji, Q. Y. Jia, C. H. Jiang, X. S. Jiang, D. P. Jin, S. Jin, Y. Jin, Y. F. Lai, F. Li, G. Li, H. H. Li, J. Li, J. C. Li, Q. J. Li, R. B. Li, R. Y. Li, S. M. Li, W. G. Li, X. L. Li, X. Q. Li, X. S. Li, Y. F. Liang, H. B. Liao, C. X. Liu, F. Liu, Fang Liu, H. M. Liu, J. B. Liu, J. P. Liu, R. G. Liu, Z. A. Liu, Z. X. Liu, F. Lu, G. R. Lu, J. G. Lu, C. L. Luo, X. L. Luo, F. C. Ma, J. M. Ma, L. L. Ma, Q. M. Ma, X. Y. Ma, Z. P. Mao, X. H. Mo, J. Nie, Z. D. Nie, S. L. Olsen, H. P. Peng, N. D. Qi, C. D. Qian, H. Qin, J. F. Qiu, Z. Y. Ren, G. Rong, L. Y. Shan, L. Shang, D. L. Shen, X. Y. Shen, H. Y. Sheng, F. Shi, X. Shi, H. S. Sun, S. S. Sun, Y. Z. Sun, Z. J. Sun, X. Tang, N. Tao, Y. R. Tian, G. L. Tong, G. S. Varner, D. Y. Wang, J. Z. Wang, K. Wang, L. Wang, L. S. Wang, M. Wang, P. Wang, P. L. Wang, S. Z. Wang, W. F. Wang, Y. F. Wang, Zhe Wang, Z. Wang, Zheng Wang, Z. Y. Wang, C. L. Wei, D. H. Wei, N. Wu, Y. M. Wu, X. M. Xia, X. X. Xie, B. Xin, G. F. Xu, H. Xu, Y. Xu, S. T. Xue, M. L. Yan, F. Yang, H. X. Yang, J. Yang, S. D. Yang, Y. X. Yang, M. Ye, M. H. Ye, Y. X. Ye, L. H. Yi, Z. Y. Yi, C. S. Yu, G. W. Yu, C. Z. Yuan, J. M. Yuan, Y. Yuan, Q. Yue, S. L. Zang, Yu Zeng, Y. Zeng, B. X. Zhang, B. Y. Zhang, C. C. Zhang, D. H. Zhang, H. Y. Zhang, J. Zhang, J. Y. Zhang, J. W. Zhang, L. S. Zhang, Q. J. Zhang, S. Q. Zhang, X. M. Zhang, X. Y. Zhang, Y. J. Zhang, Y. Y. Zhang, Yiyun Zhang, Z. P. Zhang, Z. Q. Zhang, D. X. Zhao, J. B. Zhao, J. W. Zhao, M. G. Zhao, P. P. Zhao, W. R. Zhao, X. J. Zhao, Y. B. Zhao, Z. G. Zhao, H. Q. Zheng, J. P. Zheng, L. S. Zheng, Z. P. Zheng, X. C. Zhong, B. Q. Zhou, G. M. Zhou, 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, and B. S. Zou.
Subjects: Physics, Nuclear and High Energy Physics, Nuclear magnetic resonance, Angular distribution, Analytical chemistry, Quarkonium, Polarization (waves), Helicity, Particle identification
Abstract: The polarization of the chi(c2) produced in psi(2S) decays into gammachi(c2) is measured using a sample of 14x10(6)psi(2S) events collected by the BESII detector at the BEPC storage ring. A fit to the chi(c2) production and decay angular distributions in psi(2S)-->gammachi(c2), chi(c2)-->pi(+)pi(-) and K+K- yields values x=A(1)/A(0)=2.08+/-0.44 and y=A(2)/A(0)=3.03+/-0.66, with a correlation rho=0.92 between them, where A(0,1,2) are the chi(c2) helicity amplitudes. The measurement agrees with a pure E1 transition, and M2 and E3 contributions do not differ significantly from zero.
Published: 2004

386. Observation ofK(892)0K¯(892)0inχcJdecays

Author: Yudan Wang, W. G. Li, W. R. Zhao, G. R. Lu, F. Liu, D. Y. Wang, Ke Wang, Y. N. Gao, J. Nie, Z. A. Zhu, H. M. Liu, L. L. Ma, Y. S. Dai, X. L. Luo, Z. A. Liu, C. S. Gao, Jinxing Zheng, Y. C. Zhu, Y. X. Yang, S. P. Chi, M. H. Ye, Feng Shi, S. D. Gu, S. Q. Zhang, Y. Ban, Zheng Wang, P. L. Wang, J. G. Lu, Q. Yue, Z. J. Guo, F. Lu, Y. Z. Sun, Guangzhao Zhou, Z. P. Zheng, X. Y. Zhang, K. J. Zhu, J. M. Yuan, Chun-Hua Jiang, Q. M. Zhu, R. G. Liu, J. B. Liu, Yingchun Zhu, T. Hu, XZ（蔡翔舟） Cai, J. W. Zhao, Zujian Wang, Y. C. Xu, M. L. Chen, L. Y. Dong, J. Z. Bai, Miao He, K. L. He, C. D. Qian, G. W. Yu, H. X. Yang, H.S. Xu, J. B. Zhao, M. Z. Wang, X. L. Li, L. P. Zhou, F. A. Harris, Z. Z. Du, Z. Y. Yi, J. P. Liu, G. S. Varner, Qingying Jia, R. B. Li, Q. M. Ma, G. F. Xu, H. S. Sun, R. Y. Li, Z. P. Mao, S. M. Li, Z. P. Zhang, Fan Yang, Y. B. Zhao, Xiru Huang, X. H. He, X. J. Zhao, S. Jin, X. Y. Shen, L. H. Yi, Z. Y. Ren, Y. P. Chu, Haiping Peng, G. L. Tong, Z. X. Liu, X. B. Ji, Lianyou Shan, C. Z. Yuan, Y. Yuan, Jun-Bing Ma, Y. S. Zhu, F. Li, J. C. Chen, M. Ablikim, B. A. Zhuang, Cunfeng Wei, F. C. Ma, Zhe Wang, Ning Zhou, Yu Zeng, Qiyang Zhang, Bing Zhou, S. D. Yang, X. C. Zhong, Y. Jin, J. W. Zhang, Y. J. Zhang, J. G. Bian, Jun Chen, S. L. Zang, Shang Lunlin, P. Wang, Q. J. Li, G. Li, X. Y. Ma, S. T. Xue, J. F. Qiu, C. D. Fu, D. H. Wei, H. L. Dai, B.S. Zou, Z. Y. Deng, Bo Xin, Huirun Chen, W. X. Gong, J. Fang, L. S. Zheng, Xunchao Zhang, Z. Y. Zhang, P. P. Zhao, H. Y. Sheng, Han-Qing Zheng, Y. M. Wu, Lei Zhang, H. M. Hu, X. H. Mo, L. S. Wang, N. D. Qi, H. S. Chen, J. Z. Wang, G. Rong, B. X. Zhang, S. L. Olsen, M. G. Zhao, X. M. Xia, Y. F. Liang, Jiming Yang, Z. Y. Wang, D. P. Jin, H. Y. Zhang, G. S. Huang, H. Y. Fu, J. Y. Zhang, X. Shi, D. H. Zhang, C. S. Yu, Y. K. Heng, Y. Y. Zhang, D. L. Shen, C. X. Liu, Z. D. Nie, X. Q. Li, H. Qin, Z. G. Zhao, S. Z. Wang, Jin Chen, S. S. Fang, L. Huang, Fang Liu, Z. J. Sun, Xintong Li, X. X. Xie, C. L. Luo, D. X. Zhao, B. Y. Zhang, Nongjian Tao, C. C. Zhang, Hangxu Li, Jiemin Li, J. C. Li, Xingzhu Cui, S. S. Sun, N. Wu, J. F. Chang, X. Tang, Hongbo Liao, Y. Zeng, Y. Q. Guo, Y. B. Chen, Yiyun Zhang, Y. F. Lai, H. F. Chen, W. F. Wang, Y. X. Ye, X. S. Jiang, M. Y. Gong, Juan Zhang, Y. N. Guo, Yang Tian, S. X. Du, and M. L. Yan
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics
Published: 2004

387. Evidence forf0(980)f0(980)production inχc0decays

Author: Y. X. Yang, Fang Liu, J. C. Li, Ke Wang, Z. Z. Du, Xunchao Zhang, J. W. Zhao, X. Tang, L. S. Wang, M. G. Zhao, J. Nie, X. H. Mo, Z. X. Liu, M. H. Ye, Shang Lunlin, G. Li, S. Q. Zhang, W. G. Li, G. W. Yu, Yingchun Zhu, D. X. Zhao, B. Y. Zhang, Y. C. Zhu, Y. Z. Sun, D. Y. Wang, X. L. Luo, C. D. Fu, Y. Jin, Z. Y. Yi, Qiyang Zhang, P. L. Wang, Z. Y. Deng, Y. S. Dai, C. S. Gao, Hangxu Li, Jiemin Li, Jinxing Zheng, P. Wang, L. L. Ma, X. Q. Li, Z. A. Liu, J. F. Chang, H. M. Liu, Jiming Yang, Xingzhu Cui, S. D. Gu, Hongbo Liao, Yudan Wang, Q. Yue, G. R. Lu, F. A. Harris, M. Y. Gong, Y. Ban, X. M. Xia, Z. P. Zhang, Yiyun Zhang, Bo Xin, S. S. Sun, F. Li, F. Lu, F. C. Ma, Z. A. Zhu, H. Qin, Z. J. Guo, Y. X. Ye, X. H. He, Y. P. Chu, Q. M. Zhu, H. Y. Fu, H. S. Chen, S. M. Li, Fan Yang, X. B. Ji, Q. M. Ma, J. G. Bian, Juan Zhang, J. Z. Bai, C. L. Luo, S. L. Zang, Y. C. Xu, Bing Zhou, X. Y. Zhang, G. S. Varner, Qingying Jia, J. F. Qiu, Z. P. Zheng, M. Z. Wang, Nongjian Tao, C. C. Zhang, Y. N. Guo, W. R. Zhao, C. Z. Yuan, H. X. Yang, H.S. Xu, Y. Yuan, Y. S. Zhu, S. P. Chi, F. Liu, Zhe Wang, R. G. Liu, N. Wu, H. S. Sun, J. Z. Wang, Miao He, Xintong Li, Haiping Peng, L. P. Zhou, Feng Shi, J. P. Liu, X. X. Xie, K. J. Zhu, Y. N. Gao, K. L. He, J. M. Yuan, J. B. Liu, Y. F. Liang, Z. P. Mao, D. L. Shen, X. S. Jiang, H. Y. Sheng, S. D. Yang, Jun Chen, D. P. Jin, Z. Y. Ren, Xiru Huang, C. D. Qian, N. D. Qi, Yang Tian, S. Z. Wang, D. H. Zhang, Guangzhao Zhou, H. L. Dai, C. S. Yu, C. X. Liu, G. L. Tong, P. P. Zhao, Z. Y. Zhang, S. X. Du, Han-Qing Zheng, M. Ablikim, B. A. Zhuang, M. L. Yan, Z. G. Zhao, J. B. Zhao, H. M. Hu, Lei Zhang, G. Rong, Z. D. Nie, L. Huang, G. F. Xu, Y. Zeng, S. Jin, Jin Chen, Z. J. Sun, X. Y. Shen, Y. Q. Guo, S. S. Fang, Jun-Bing Ma, Y. B. Chen, X. Y. Ma, W. X. Gong, R. Y. Li, R. B. Li, L. H. Yi, Y. F. Lai, X. Shi, Cunfeng Wei, Ning Zhou, H. F. Chen, J. W. Zhang, W. F. Wang, Y. M. Wu, J. G. Lu, T. Hu, XZ（蔡翔舟） Cai, X. L. Li, Lianyou Shan, X. C. Zhong, L. Y. Dong, Q. J. Li, D. H. Wei, B. X. Zhang, Chun-Hua Jiang, Zujian Wang, B.S. Zou, M. L. Chen, H. Y. Zhang, G. S. Huang, J. Y. Zhang, Y. K. Heng, Y. Y. Zhang, Zheng Wang, J. C. Chen, Yu Zeng, J. Fang, L. S. Zheng, Y. J. Zhang, Y. B. Zhao, X. J. Zhao, S. T. Xue, S. L. Olsen, Z. Y. Wang, and Huirun Chen
Subjects: Physics, Nuclear and High Energy Physics, Nuclear magnetic resonance, Branching fraction, Analytical chemistry, Production (computer science), Particle identification
Abstract: Using a sample of 14x10{sup 6} {psi}(2S) events accumulated with the BES II detector, evidence for f{sub 0}(980)f{sub 0}(980) production in {chi}{sub c0} decays is obtained for the first time; the branching ratio is determined to be B[{chi}{sub c0}{yields}f{sub 0}(980)f{sub 0}(980){yields}{pi}{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -}]=[7.6{+-}1.9 (stat){+-}1.6 (syst)]x10{sup -4}. The significance of the f{sub 0}(980) signal is about 4.6{sigma}.
Published: 2004

388. Search forKS0KL0inψ′′decays

Author: M. Ablikim, J. Z. Bai, Y. Ban, J. G. Bian, X. Cai, J. F. Chang, H. F. Chen, H. S. Chen, H. X. Chen, J. C. Chen, Jin Chen, Jun Chen, M. L. Chen, Y. B. Chen, S. P. Chi, Y. P. Chu, X. Z. Cui, H. L. Dai, Y. S. Dai, Z. Y. Deng, L. Y. Dong, S. X. Du, Z. Z. Du, J. Fang, S. S. Fang, C. D. Fu, H. Y. Fu, C. S. Gao, Y. N. Gao, M. Y. Gong, W. X. Gong, S. D. Gu, Y. N. Guo, Y. Q. Guo, K. L. He, M. He, X. He, Y. K. Heng, H. M. Hu, T. Hu, G. S. Huang, L. Huang, X. P. Huang, X. B. Ji, Q. Y. Jia, C. H. Jiang, X. S. Jiang, D. P. Jin, S. Jin, Y. Jin, Y. F. Lai, F. Li, G. Li, H. H. Li, J. Li, J. C. Li, Q. J. Li, R. B. Li, R. Y. Li, S. M. Li, W. G. Li, X. L. Li, X. Q. Li, X. S. Li, Y. F. Liang, H. B. Liao, C. X. Liu, F. Liu, Fang Liu, H. M. Liu, J. B. Liu, J. P. Liu, R. G. Liu, Z. A. Liu, Z. X. Liu, F. Lu, G. R. Lu, J. G. Lu, C. L. Luo, X. L. Luo, F. C. Ma, J. M. Ma, L. L. Ma, Q. M. Ma, X. Y. Ma, Z. P. Mao, X. H. Mo, J. Nie, Z. D. Nie, H. P. Peng, N. D. Qi, C. D. Qian, H. Qin, J. F. Qiu, Z. Y. Ren, G. Rong, L. Y. Shan, L. Shang, D. L. Shen, X. Y. Shen, H. Y. Sheng, F. Shi, X. Shi, H. S. Sun, S. S. Sun, Y. Z. Sun, Z. J. Sun, X. Tang, N. Tao, Y. R. Tian, G. L. Tong, D. Y. Wang, J. Z. Wang, K. Wang, L. Wang, L. S. Wang, M. Wang, P. Wang, P. L. Wang, S. Z. Wang, W. F. Wang, Y. F. Wang, Zhe Wang, Z. Wang, Zheng Wang, Z. Y. Wang, C. L. Wei, D. H. Wei, N. Wu, Y. M. Wu, X. M. Xia, X. X. Xie, B. Xin, G. F. Xu, H. Xu, Y. Xu, S. T. Xue, M. L. Yan, F. Yang, H. X. Yang, J. Yang, S. D. Yang, Y. X. Yang, M. Ye, M. H. Ye, Y. X. Ye, L. H. Yi, Z. Y. Yi, C. S. Yu, G. W. Yu, C. Z. Yuan, J. M. Yuan, Y. Yuan, Q. Yue, S. L. Zang, Yu. Zeng, Y. Zeng, B. X. Zhang, B. Y. Zhang, C. C. Zhang, D. H. Zhang, H. Y. Zhang, J. Zhang, J. Y. Zhang, J. W. Zhang, L. S. Zhang, Q. J. Zhang, S. Q. Zhang, X. M. Zhang, X. Y. Zhang, Y. J. Zhang, Y. Y. Zhang, Yiyun Zhang, Z. P. Zhang, Z. Q. Zhang, D. X. Zhao, J. B. Zhao, J. W. Zhao, M. G. Zhao, P. P. Zhao, W. R. Zhao, X. J. Zhao, Y. B. Zhao, Z. G. Zhao, H. Q. Zheng, J. P. Zheng, L. S. Zheng, Z. P. Zheng, X. C. Zhong, B. Q. Zhou, G. M. Zhou, 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, and B. S. Zou
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Branching fraction, High Energy Physics::Experiment, Charm (quantum number), Limit (mathematics), Particle identification
Abstract: (KSKL0)-K-0 from psi" decays is searched for using the psi" data collected by BESII at BEPC, and the upper limit of the branching fraction is determined to be B(psi(")-->(KSKL0)-K-0) (KSKL0)-K-0 and psi'-->(KSKL0)-K-0.
Published: 2004

389. Observation of a Threshold Enhancement in thepΛ¯Invariant-Mass Spectrum

Author: M. Ablikim, J. Z. Bai, Y. Ban, J. G. Bian, X. Cai, J. F. Chang, H. F. Chen, H. S. Chen, H. X. Chen, J. C. Chen, Jin Chen, Jun Chen, M. L. Chen, Y. B. Chen, S. P. Chi, Y. P. Chu, X. Z. Cui, H. L. Dai, Y. S. Dai, Z. Y. Deng, L. Y. Dong, S. X. Du, Z. Z. Du, J. Fang, S. S. Fang, C. D. Fu, H. Y. Fu, C. S. Gao, Y. N. Gao, M. Y. Gong, W. X. Gong, S. D. Gu, Y. N. Guo, Y. Q. Guo, Z. J. Guo, F. A. Harris, K. L. He, M. He, X. He, Y. K. Heng, H. M. Hu, T. Hu, G. S. Huang, L. Huang, X. P. Huang, X. B. Ji, Q. Y. Jia, C. H. Jiang, X. S. Jiang, D. P. Jin, S. Jin, Y. Jin, Y. F. Lai, F. Li, G. Li, H. H. Li, J. Li, J. C. Li, Q. J. Li, R. B. Li, R. Y. Li, S. M. Li, W. G. Li, X. L. Li, X. Q. Li, X. S. Li, Y. F. Liang, H. B. Liao, C. X. Liu, F. Liu, Fang Liu, H. M. Liu, J. B. Liu, J. P. Liu, R. G. Liu, Z. A. Liu, Z. X. Liu, F. Lu, G. R. Lu, J. G. Lu, C. L. Luo, X. L. Luo, F. C. Ma, J. M. Ma, L. L. Ma, Q. M. Ma, X. Y. Ma, Z. P. Mao, X. H. Mo, J. Nie, Z. D. Nie, S. L. Olsen, H. P. Peng, N. D. Qi, C. D. Qian, H. Qin, J. F. Qiu, Z. Y. Ren, G. Rong, L. Y. Shan, L. Shang, D. L. Shen, X. Y. Shen, H. Y. Sheng, F. Shi, X. Shi, H. S. Sun, S. S. Sun, Y. Z. Sun, Z. J. Sun, X. Tang, N. Tao, Y. R. Tian, G. L. Tong, G. S. Varner, D. Y. Wang, J. X. Wang, J. Z. Wang, K. Wang, L. Wang, L. S. Wang, M. Wang, P. Wang, P. L. Wang, S. Z. Wang, W. F. Wang, Y. F. Wang, Zhe Wang, Z. Wang, Zheng Wang, Z. Y. Wang, C. L. Wei, D. H. Wei, N. Wu, Y. M. Wu, X. M. Xia, X. X. Xie, B. Xin, G. F. Xu, H. Xu, Y. Xu, S. T. Xue, M. L. Yan, F. Yang, H. X. Yang, J. Yang, S. D. Yang, Y. X. Yang, M. Ye, M. H. Ye, Y. X. Ye, L. H. Yi, Z. Y. Yi, C. S. Yu, G. W. Yu, C. Z. Yuan, J. M. Yuan, Y. Yuan, Q. Yue, S. L. Zang, Yu Zeng, Y. Zeng, B. X. Zhang, B. Y. Zhang, C. C. Zhang, D. H. Zhang, H. Y. Zhang, J. Zhang, J. Y. Zhang, J. W. Zhang, L. S. Zhang, Q. J. Zhang, S. Q. Zhang, X. M. Zhang, X. Y. Zhang, Y. J. Zhang, Y. Y. Zhang, Yiyun Zhang, Z. P. Zhang, Z. Q. Zhang, D. X. Zhao, J. B. Zhao, J. W. Zhao, M. G. Zhao, P. P. Zhao, W. R. Zhao, X. J. Zhao, Y. B. Zhao, Z. G. Zhao, H. Q. Zheng, J. P. Zheng, L. S. Zheng, Z. P. Zheng, X. C. Zhong, B. Q. Zhou, G. M. Zhou, 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, and B. S. Zou.
Subjects: Physics, Electron–positron annihilation, General Physics and Astronomy, Resonance, Lambda, law.invention, Nuclear physics, law, Quark–gluon plasma, Mass spectrum, High Energy Physics::Experiment, Invariant mass, Nuclear Experiment, Collider, Bar (unit)
Abstract: An enhancement near the m(p)+M-Lambda mass threshold is observed in the combined p(U) over bar and (p) over bar Lambda invariant-mass spectrum from J/psi-->pK(-)(U) over bar +c.c. decays. It can be fit with an S-wave Breit-Wigner resonance with a mass m=2075+/-12(stat)+/-5(syst) MeV and a width of Gamma=90+/-35(stat)+/-9(syst) MeV; it can also be fit with a P-wave Breit-Wigner resonance. Evidence for a similar enhancement is also observed in psi'-->pK(-)(U) over bar +c.c. decays. The analysis is based on samples of 5.8x10(7)J/psi and 1.4x10(7)psi' decays accumulated in the BES II detector at the Beijing Electron-Positron Collider.
Published: 2004

390. Measurement of the branching fraction ofJ/ψ→π+π−π0

Author: F. Lu, Y. C. Zhu, Z. Z. Du, P. L. Wang, Meng Wang, B.S. Zou, Z. X. Liu, H. S. Chen, M. H. Ye, F. A. Harris, X. S. Jiang, Feng Shi, Bo Xin, N. Wu, Z. P. Zhang, H. Y. Sheng, N. D. Qi, Y. Jin, C. Z. Yuan, S. D. Yang, H. Y. Zhang, G. S. Huang, L. Y. Dong, S. D. Gu, Q. Yue, Zhe Wang, L. L. Ma, Y. B. Zhao, Fang Liu, J. Y. Zhang, W. D. Li, X. J. Zhao, Qiyang Zhang, F. Li, Z. J. Guo, J. G. Lu, F. C. Ma, Guangzhao Zhou, Z. A. Liu, Jiming Yang, Y. Ban, J. Z. Bai, Y. K. Heng, Y. Y. Zhang, Z. G. Zhao, J. B. Zhao, X. L. Luo, Xunchao Zhang, T. Hu, P. Wang, J. F. Qiu, D. X. Zhao, B. Y. Zhang, K. L. He, S. W. Han, J. Chen, Hangxu Li, J. M. Zhang, Jiemin Li, XZ（蔡翔舟） Cai, L. W. Song, L. Huang, X. L. Li, X. C. Meng, G. F. Xu, L. S. Wang, S. Jin, Qingying Jia, P. P. Zhao, X. Y. Shen, M. L. Chen, Z. J. Sun, Z. D. Nie, R. Y. Li, Xingzhu Cui, Yingchun Zhu, Chun-Hua Jiang, Zheng Wang, J. W. Zhao, S. L. Zang, H. L. Dai, Jun Chen, Zujian Wang, Cunfeng Wei, Ning Zhou, J. F. Chang, Hongbo Liao, Lei Zhang, Yudan Wang, S. S. Sun, Yiyun Zhang, J. C. Li, J. C. Chen, G. W. Yu, J. W. Zhang, M. L. Gao, Z. Y. Yi, Q. J. Li, G. R. Lu, Y. Zeng, S. M. Li, Y. X. Ye, Fan Yang, Y. Q. Guo, X. Tang, J. Fang, L. S. Zheng, Y. J. Zhang, S. T. Xue, R. B. Li, G. Rong, Z. A. Zhu, L. H. Yi, Y. Yuan, Y. S. Zhu, Y. B. Chen, Lianyou Shan, Z. Y. Zhang, X. M. Xia, Y. F. Lai, H. F. Chen, W. F. Wang, Bing Zhou, Huirun Chen, X. Q. Li, J. Nie, Han-Qing Zheng, X. C. Zhong, L. P. Fu, Y. X. Yang, J. Z. Wang, H. X. Yang, H.S. Xu, W. B. Yan, C. L. Luo, H. Y. Fu, S. L. Olsen, H. M. Hu, S. Q. Zhang, Nongjian Tao, C. C. Zhang, Z. Y. Wang, Y. S. Dai, C. S. Gao, Jinxing Zheng, J. G. Bian, Miao He, J. J. He, B. X. Zhang, Z. P. Zheng, H. Qin, D. L. Shen, Q. M. Zhu, L. P. Zhou, C. X. Liu, S. Z. Wang, Y. Z. Sun, X. H. Mo, Y. C. Xu, Y. F. Liang, D. P. Jin, Z. P. Mao, Xiru Huang, M. Z. Wang, G. L. Tong, J. P. Liu, B. A. Zhuang, H. S. Sun, Jun-Bing Ma, Haiping Peng, X. Y. Ma, X. Y. Zhang, W. R. Zhao, F. Liu, W. X. Gong, M. Y. Gong, D. H. Zhang, R. G. Liu, Y. N. Gao, J. B. Liu, Z. Y. Ren, C. S. Yu, Y. M. Wu, X. Shi, W. G. Li, S. S. Fang, X. H. He, D. Y. Wang, Yang Tian, C. D. Qian, H. M. Liu, S. X. Du, M. L. Yan, Juan Zhang, Y. N. Guo, S. P. Chi, K. J. Zhu, J. M. Yuan, Y. P. Chu, X. B. Ji, Y. B. Liu, Shang Lunlin, G. Li, C. D. Fu, Xintong Li, Z. Y. Deng, and X. X. Xie
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Branching fraction
Abstract: Using 58 million $J/\ensuremath{\psi}$ and 14 million $\ensuremath{\psi}(2S)$ decays obtained by the BES II experiment, the branching fraction of $J/\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\psi}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ is determined. The result is $(2.10\ifmmode\pm\else\textpm\fi{}0.12)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2},$ which is significantly higher than previous measurements.
Published: 2004

391. ψ(2S)decays intoJ/ψplus two photons

Author: Z. G. Zhao, B.S. Zou, X. Q. Li, Z. P. Zheng, Qiyang Zhang, L. Huang, S. Z. Wang, Xiru Huang, Feng Liu, R. B. Li, G. L. Tong, B. A. Zhuang, Jiming Yang, Z. J. Sun, Y. Yuan, Y. S. Zhu, L. H. Yi, P. Wang, W. R. Zhao, H. S. Chen, L. W. Song, F. Li, F. C. Ma, J. W. Zhao, J. G. Lu, F. Liu, B. X. Zhang, J. Chen, G. W. Yu, S. S. Fang, J. C. Li, G. F. Xu, H. Qin, W. B. Yan, M. L. Chen, Feng Shi, S. Jin, T. Hu, XZ（蔡翔舟） Cai, Y. B. Liu, Y. N. Gao, H. Y. Zhang, X. Tang, Chun-Hua Jiang, J. F. Qiu, X. L. Li, G. S. Huang, H. Y. Sheng, R. Y. Li, Shang Lunlin, N. D. Qi, Zujian Wang, Yingchun Zhu, L. L. Ma, Q. J. Li, Z. D. Nie, Y. Jin, J. Nie, G. Li, Lianyou Shan, J. Y. Zhang, Y. J. Zhang, Z. Y. Yi, Z. A. Liu, X. C. Zhong, Cunfeng Wei, Ning Zhou, Fang Liu, C. D. Fu, S. T. Xue, F. Lu, Miao He, Guangzhao Zhou, L. P. Fu, C. L. Luo, Y. Ban, Y. B. Zhao, J. W. Zhang, J. Z. Wang, X. Y. Zhang, Y. K. Heng, Z. Y. Deng, Y. Y. Zhang, M. Y. Gong, X. J. Zhao, Nongjian Tao, C. C. Zhang, Xunchao Zhang, D. X. Zhao, B. Y. Zhang, Hangxu Li, R. G. Liu, Y. X. Yang, Y. S. Dai, Jiemin Li, J. B. Zhao, C. S. Gao, L. P. Zhou, Y. F. Liang, D. P. Jin, J. B. Liu, Y. C. Zhu, S. L. Olsen, Xingzhu Cui, Jinxing Zheng, M. H. Ye, Y. M. Wu, D. H. Zhang, Z. J. Guo, P. L. Wang, Meng Wang, C. S. Yu, Z. Y. Wang, Z. P. Mao, S. P. Chi, S. S. Sun, J. Z. Bai, L. S. Wang, S. Q. Zhang, X. Y. Shen, Jun-Bing Ma, Yang Tian, X. Y. Ma, W. X. Gong, K. J. Zhu, J. M. Yuan, Z. Z. Du, F. A. Harris, Q. M. Zhu, X. H. He, Y. Z. Sun, L. Y. Dong, Z. P. Zhang, K. L. He, S. X. Du, X. M. Xia, Z. X. Liu, Yudan Wang, S. W. Han, Zheng Wang, M. L. Yan, Y. C. Xu, J. M. Zhang, X. Shi, Y. P. Chu, C. Z. Yuan, G. R. Lu, M. Z. Wang, X. B. Ji, Zhe Wang, S. L. Zang, Juan Zhang, Z. A. Zhu, H. S. Sun, Y. N. Guo, J. C. Chen, Haiping Peng, Huirun Chen, H. Y. Fu, J. Fang, S. D. Yang, L. S. Zheng, S. M. Li, Fan Yang, X. H. Mo, H. L. Dai, D. L. Shen, C. X. Liu, X. L. Luo, Bo Xin, W. D. Li, J. J. He, Xintong Li, X. X. Xie, M. L. Gao, Y. Zeng, Y. Q. Guo, Y. B. Chen, Y. F. Lai, H. F. Chen, W. F. Wang, N. Wu, J. F. Chang, Hongbo Liao, Yiyun Zhang, Y. X. Ye, X. S. Jiang, Z. Y. Zhang, Han-Qing Zheng, H. M. Hu, H. X. Yang, H.S. Xu, S. D. Gu, Q. Yue, J. P. Liu, G. S. Varner, Qingying Jia, Jun Chen, Z. Y. Ren, W. G. Li, D. Y. Wang, H. M. Liu, Bing Zhou, C. D. Qian, J. G. Bian, P. P. Zhao, Lei Zhang, G. Rong, and X. C. Meng
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Photon, Electron–positron annihilation
Published: 2004

392. Search for the pentaquark state inψ(2S)andJ/ψdecays toKS0pK−n̄andKS0p¯K+n

Author: Feng Shi, Xingzhu Cui, M. H. Ye, Guangzhao Zhou, Zheng Wang, N. Wu, L. L. Ma, Y. X. Yang, Yang Tian, S. S. Sun, Z. A. Liu, B. X. Zhang, J. B. Zhao, X. Y. Shen, Y. Ban, L. Y. Dong, Y. P. Chu, X. B. Ji, S. Q. Zhang, H. S. Chen, S. X. Du, M. L. Yan, Yudan Wang, S. P. Chi, G. R. Lu, K. J. Zhu, J. M. Yuan, J. C. Chen, Y. Z. Sun, J. Z. Bai, Z. Y. Zhang, H. X. Yang, H.S. Xu, Jun-Bing Ma, Shang Lunlin, G. Li, J. C. Li, Z. A. Zhu, Fang Liu, Y. B. Zhao, Y. C. Zhu, X. J. Zhao, H. Y. Sheng, P. L. Wang, X. C. Meng, X. Y. Ma, Jiming Yang, Meng Wang, Han-Qing Zheng, S. L. Zang, J. Fang, N. D. Qi, Qiyang Zhang, C. D. Fu, Z. Y. Deng, Z. J. Guo, Juan Zhang, Yingchun Zhu, H. M. Hu, Y. Jin, W. X. Gong, D. X. Zhao, J. P. Liu, B. Y. Zhang, Hangxu Li, Jiemin Li, Z. G. Zhao, Q. J. Li, Y. N. Guo, S. Z. Wang, Z. Z. Du, J. W. Zhao, F. A. Harris, S. D. Yang, S. D. Gu, Z. Y. Yi, X. Tang, L. Huang, Q. Yue, Z. X. Liu, X. Y. Zhang, P. Wang, G. W. Yu, Z. P. Zhang, Z. J. Sun, X. Shi, Z. P. Zheng, R. G. Liu, F. Li, S. M. Li, Fan Yang, F. C. Ma, Y. M. Wu, J. G. Lu, Z. Y. Ren, J. B. Liu, L. P. Fu, G. S. Varner, Qingying Jia, C. L. Luo, Nongjian Tao, T. Hu, Huirun Chen, Xiru Huang, C. C. Zhang, G. L. Tong, Bing Zhou, M. Y. Gong, XZ（蔡翔舟） Cai, X. L. Li, H. L. Dai, Jun Chen, J. F. Qiu, B. A. Zhuang, W. B. Yan, X. H. Mo, Lianyou Shan, M. L. Gao, Y. Zeng, L. S. Wang, F. Lu, W. R. Zhao, R. Y. Li, Y. Yuan, Y. S. Zhu, F. Liu, X. C. Zhong, Y. Q. Guo, Q. M. Zhu, S. S. Fang, K. L. He, Bo Xin, Y. B. Chen, S. W. Han, Y. C. Xu, J. M. Zhang, Y. N. Gao, Y. B. Liu, B.S. Zou, Y. F. Lai, H. F. Chen, M. Z. Wang, Cunfeng Wei, W. D. Li, Ning Zhou, W. F. Wang, H. S. Sun, Haiping Peng, J. W. Zhang, Miao He, X. L. Luo, L. P. Zhou, Z. P. Mao, W. G. Li, J. Nie, X. Q. Li, R. B. Li, D. Y. Wang, J. Chen, C. Z. Yuan, L. H. Yi, Zhe Wang, H. M. Liu, Y. S. Dai, X. S. Jiang, C. S. Gao, H. Qin, Jinxing Zheng, G. F. Xu, Chun-Hua Jiang, J. J. He, S. Jin, Zujian Wang, Xintong Li, X. X. Xie, J. F. Chang, Hongbo Liao, Yiyun Zhang, Y. X. Ye, D. L. Shen, C. X. Liu, X. M. Xia, H. Y. Fu, S. T. Xue, S. L. Olsen, Z. Y. Wang, L. W. Song, M. L. Chen, Y. J. Zhang, L. S. Zheng, Xunchao Zhang, H. Y. Zhang, G. S. Huang, J. Y. Zhang, J. Z. Wang, Y. F. Liang, D. P. Jin, Y. K. Heng, Y. Y. Zhang, J. G. Bian, D. H. Zhang, C. S. Yu, Z. D. Nie, X. H. He, C. D. Qian, P. P. Zhao, Lei Zhang, and G. Rong
Subjects: Physics, Combinatorics, Nuclear and High Energy Physics, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Order (ring theory), High Energy Physics::Experiment, Production (computer science), State (functional analysis), Atomic physics, Pentaquark
Abstract: Results are presented on $\ensuremath{\psi}(2S)$ and $J/\ensuremath{\psi}$ hadronic decays to ${K}_{S}^{0}{\mathrm{pK}}^{\ensuremath{-}}\mathrm{n\ifmmode \bar{}\else \={}\fi{}}$ and ${K}_{S}^{0}\overline{p}{K}^{+}n$ final states from data samples of 14 million $\ensuremath{\psi}(2S)$ and 58 million $J/\ensuremath{\psi}$ events accumulated at the BES II detector. No $\ensuremath{\Theta}(1540)$ signal, the pentaquark candidate, is observed, and upper limits are set for $\mathcal{B}(\ensuremath{\psi}(2S)\ensuremath{\rightarrow}\ensuremath{\Theta}\overline{\ensuremath{\Theta}}\ensuremath{\rightarrow}{K}_{S}^{0}{\mathrm{pK}}^{\ensuremath{-}}\mathrm{n\ifmmode \bar{}\else \={}\fi{}}{+K}_{S}^{0}\overline{p}{K}^{+}n)l0.84\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ and $\mathcal{B}(J/\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\psi}}\ensuremath{\Theta}\overline{\ensuremath{\Theta}}\ensuremath{\rightarrow}{K}_{S}^{0}{\mathrm{pK}}^{\ensuremath{-}}\mathrm{n\ifmmode \bar{}\else \={}\fi{}}{+K}_{S}^{0}\overline{p}{K}^{+}n)l1.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ at the 90% confidence level. For single $\ensuremath{\Theta}(1540)$ production, the upper limits determined by our analysis are also on the order of ${10}^{\ensuremath{-}5}$ in both $\ensuremath{\psi}(2S)$ and $J/\ensuremath{\psi}$ decays.
Published: 2004

393. Study ofψ(2S)decays toXJ/ψ

Author: C. L. Luo, Z. P. Zheng, Nongjian Tao, C. C. Zhang, Q. M. Zhu, Xiru Huang, G. L. Tong, Z. Y. Zhang, Y. C. Xu, M. Ablikim, B. A. Zhuang, Han-Qing Zheng, M. Z. Wang, Zheng Wang, Yingchun Zhu, H. S. Sun, H. M. Hu, Haiping Peng, Y. B. Zhao, Z. D. Nie, J. C. Chen, Z. Y. Yi, X. J. Zhao, R. B. Li, Y. M. Wu, J. G. Lu, F. Li, Z. G. Zhao, J. Fang, S. D. Gu, L. H. Yi, Q. Yue, L. Huang, D. L. Shen, W. R. Zhao, C. X. Liu, L. S. Zheng, H. Y. Zhang, T. Hu, XZ（蔡翔舟） Cai, F. Liu, Y. Jin, F. C. Ma, Z. J. Sun, G. S. Huang, X. L. Li, X. H. He, Lianyou Shan, X. C. Zhong, Ke Wang, J. Y. Zhang, S. T. Xue, J. Nie, G. S. Varner, Qingying Jia, J. F. Qiu, H. X. Yang, H.S. Xu, Y. K. Heng, Y. Y. Zhang, Bo Xin, Feng Shi, Y. N. Gao, B. X. Zhang, Jun-Bing Ma, Xingzhu Cui, J. C. Li, Z. J. Guo, Y. S. Dai, Jun Chen, S. L. Zang, C. S. Gao, Jinxing Zheng, Xunchao Zhang, Y. X. Yang, B.S. Zou, X. Y. Ma, W. X. Gong, Jiming Yang, Y. Zeng, P. P. Zhao, Y. Q. Guo, J. Z. Wang, X. M. Xia, L. S. Wang, K. L. He, M. G. Zhao, J. P. Liu, S. D. Yang, Qiyang Zhang, Guangzhao Zhou, Y. C. Zhu, Lei Zhang, X. Y. Zhang, R. G. Liu, J. B. Liu, S. Q. Zhang, Y. Z. Sun, Y. B. Chen, S. L. Olsen, Z. Y. Wang, J. W. Zhao, S. S. Sun, G. W. Yu, P. L. Wang, J. F. Chang, Hongbo Liao, H. Y. Fu, Q. J. Li, X. Shi, Y. F. Liang, D. P. Jin, G. Rong, Q. M. Ma, Y. F. Lai, D. H. Zhang, X. L. Luo, H. F. Chen, W. F. Wang, J. B. Zhao, C. S. Yu, Z. Y. Ren, H. L. Dai, Chun-Hua Jiang, Miao He, F. A. Harris, G. F. Xu, N. Wu, Yiyun Zhang, Y. Yuan, Y. S. Zhu, Zujian Wang, P. Wang, X. Y. Shen, Z. P. Zhang, W. G. Li, S. Jin, L. P. Zhou, J. G. Bian, Z. P. Mao, H. S. Chen, M. L. Chen, Y. X. Ye, Yudan Wang, G. R. Lu, D. H. Wei, S. M. Li, D. Y. Wang, X. S. Jiang, Fan Yang, Z. A. Zhu, Huirun Chen, Bing Zhou, Yu Zeng, H. M. Liu, C. D. Qian, Y. J. Zhang, R. Y. Li, F. Lu, X. Q. Li, Cunfeng Wei, X. H. Mo, M. H. Ye, Ning Zhou, J. W. Zhang, H. Qin, Fang Liu, C. Z. Yuan, Zhe Wang, L. Y. Dong, D. X. Zhao, B. Y. Zhang, Hangxu Li, Jiemin Li, Xintong Li, X. X. Xie, S. Z. Wang, Jin Chen, S. S. Fang, Shang Lunlin, G. Li, C. D. Fu, Z. Y. Deng, S. P. Chi, K. J. Zhu, J. M. Yuan, Y. P. Chu, X. B. Ji, Z. Z. Du, Z. X. Liu, L. L. Ma, Z. A. Liu, Y. Ban, J. Z. Bai, H. Y. Sheng, N. D. Qi, Yang Tian, S. X. Du, M. L. Yan, Juan Zhang, Y. N. Guo, X. Tang, M. Y. Gong, and H. B. Li
Subjects: Physics, Nuclear and High Energy Physics, Particle physics
Published: 2004

394. Evaluation of pedestrian winds around tall buildings by numerical approach

Author: G. C. Woo, B. Y. Zhang, J. G. Sang, B. M. Wang, Huizhi Liu, and K. Chen
Subjects: Atmospheric Science, Beijing, Computer simulation, Meteorology, Computer science, Planetary boundary layer, Pedestrian, Grid, Compressible flow, Wind engineering, Wind tunnel, Marine engineering
Abstract: A numerical model based on the compressible flow equations has been used to simulate the pedestrian wind fields around the programming tall buildings in Beijing city. The model results are well agreed with those of the wind tunnel experiments. Since numerical model can provide the detailed flow field data at each grid point and each time step, it has a great advantage compared with the wind tunnel experiment in accurately evaluating the wind effects on pedestrian and other environmental issues. Furthermore, advance computational technology has made the numerical modeling become fast and cheaply. It is believed that the numerical simulation will play an increasingly more important role in the coming years, especially in dealing with wind environment.
Published: 2004

395. Observation of a threshold enhancement in the plambda invariant-mass spectrum

Author: M, Ablikim, J Z, Bai, Y, Ban, J G, Bian, X, Cai, J F, Chang, H F, Chen, H S, Chen, H X, Chen, J C, Chen, Jin, Chen, Jun, Chen, M L, Chen, Y B, Chen, S P, Chi, Y P, Chu, X Z, Cui, H L, Dai, Y S, Dai, Z Y, Deng, L Y, Dong, S X, Du, Z Z, Du, J, Fang, S S, Fang, C D, Fu, H Y, Fu, C S, Gao, Y N, Gao, M Y, Gong, W X, Gong, S D, Gu, Y N, Guo, Y Q, Guo, Z J, Guo, F A, Harris, K L, He, M, He, X, He, Y K, Heng, H M, Hu, T, Hu, G S, Huang, L, Huang, X P, Huang, X B, Ji, Q Y, Jia, C H, Jiang, X S, Jiang, D P, Jin, S, Jin, Y, Jin, Y F, Lai, F, Li, G, Li, H H, Li, J, Li, J C, Li, Q J, Li, R B, Li, R Y, Li, S M, Li, W G, Li, X L, Li, X Q, Li, X S, Li, Y F, Liang, H B, Liao, C X, Liu, F, Liu, Fang, Liu, H M, Liu, J B, Liu, J P, Liu, R G, Liu, Z A, Liu, Z X, Liu, F, Lu, G R, Lu, J G, Lu, C L, Luo, X L, Luo, F C, Ma, J M, Ma, L L, Ma, Q M, Ma, X Y, Ma, Z P, Mao, X H, Mo, J, Nie, Z D, Nie, S L, Olsen, H P, Peng, N D, Qi, C D, Qian, H, Qin, J F, Qiu, Z Y, Ren, G, Rong, L Y, Shan, L, Shang, D L, Shen, X Y, Shen, H Y, Sheng, F, Shi, X, Shi, H S, Sun, S S, Sun, Y Z, Sun, Z J, Sun, X, Tang, N, Tao, Y R, Tian, G L, Tong, G S, Varner, D Y, Wang, J X, Wang, J Z, Wang, K, Wang, L, Wang, L S, Wang, M, Wang, P, Wang, P L, Wang, S Z, Wang, W F, Wang, Y F, Wang, Zhe, Wang, Z, Wang, Zheng, Wang, Z Y, Wang, C L, Wei, D H, Wei, N, Wu, Y M, Wu, X M, Xia, X X, Xie, B, Xin, G F, Xu, H, Xu, Y, Xu, S T, Xue, M L, Yan, F, Yang, H X, Yang, J, Yang, S D, Yang, Y X, Yang, M, Ye, M H, Ye, Y X, Ye, L H, Yi, Z Y, Yi, C S, Yu, G W, Yu, C Z, Yuan, J M, Yuan, Y, Yuan, Q, Yue, S L, Zang, Yu, Zeng, Y, Zeng, B X, Zhang, B Y, Zhang, C C, Zhang, D H, Zhang, H Y, Zhang, J, Zhang, J Y, Zhang, J W, Zhang, L S, Zhang, Q J, Zhang, S Q, Zhang, X M, Zhang, X Y, Zhang, Y J, Zhang, Y Y, Zhang, Yiyun, Zhang, Z P, Zhang, Z Q, Zhang, D X, Zhao, J B, Zhao, J W, Zhao, M G, Zhao, P P, Zhao, W R, Zhao, X J, Zhao, Y B, Zhao, Z G, Zhao, H Q, Zheng, J P, Zheng, L S, Zheng, Z P, Zheng, X C, Zhong, B Q, Zhou, G M, Zhou, 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, and B S, Zou
Abstract: An enhancement near the m(p)+M(Lambda) mass threshold is observed in the combined pLambda and pLambda invariant-mass spectrum from J/psi--pK(-)Lambda;+c.c. decays. It can be fit with an S-wave Breit-Wigner resonance with a mass m=2075+/-12(stat)+/-5(syst) MeV and a width of Gamma=90+/-35(stat)+/-9(syst) MeV; it can also be fit with a P-wave Breit-Wigner resonance. Evidence for a similar enhancement is also observed in psi(')--pK(-)Lambda;+c.c. decays. The analysis is based on samples of 5.8x10(7)J/psi and 1.4x10(7)psi(') decays accumulated in the BES II detector at the Beijing Electron-Positron Collider.
Published: 2004

396. Determination ofB(χcJ→pp¯)inψ(2S)decays

Author: Xingzhu Cui, L. P. Fu, Yang Tian, S. X. Du, M. L. Yan, X. Tang, S. L. Zang, C. L. Luo, H. X. Yang, H.S. Xu, X. C. Meng, S. T. Xue, M. Y. Gong, Qiyang Zhang, Y. Jin, Juan Zhang, F. Li, Y. N. Guo, S. S. Sun, Nongjian Tao, C. C. Zhang, Yingchun Zhu, B.S. Zou, Jun-Bing Ma, Xunchao Zhang, X. Y. Ma, S. Z. Wang, Z. Y. Zhang, M. L. Gao, P. Wang, W. X. Gong, F. C. Ma, Z. Y. Yi, J. W. Zhao, Han-Qing Zheng, Z. J. Guo, Y. Zeng, C. D. Qian, Fang Liu, G. W. Yu, J. P. Liu, S. D. Yang, S. L. Olsen, S. P. Chi, J. C. Li, D. X. Zhao, B. Y. Zhang, Hangxu Li, Y. Q. Guo, X. Shi, H. M. Hu, Jiemin Li, Z. Y. Wang, Z. D. Nie, Y. B. Zhao, L. S. Wang, Y. B. Chen, S. S. Fang, H. S. Chen, Y. M. Wu, J. F. Qiu, X. J. Zhao, X. M. Xia, X. S. Jiang, F. Lu, W. B. Yan, Y. F. Lai, S. D. Gu, J. G. Lu, Q. Yue, Z. Y. Ren, Y. B. Liu, J. G. Bian, Y. Yuan, H. F. Chen, W. F. Wang, X. Q. Li, Y. S. Zhu, K. J. Zhu, J. M. Yuan, L. W. Song, N. Wu, H. Y. Fu, X. L. Luo, T. Hu, XZ（蔡翔舟） Cai, W. G. Li, Z. Z. Du, H. Y. Zhang, M. L. Chen, J. Z. Wang, X. L. Li, H. L. Dai, Bo Xin, R. Y. Li, Miao He, R. B. Li, G. S. Varner, Qingying Jia, D. Y. Wang, G. S. Huang, P. P. Zhao, Z. G. Zhao, J. Chen, H. Qin, Shang Lunlin, Y. F. Liang, K. L. He, L. Huang, W. D. Li, G. F. Xu, L. H. Yi, S. W. Han, G. Li, D. P. Jin, H. M. Liu, L. P. Zhou, S. Jin, Cunfeng Wei, Y. C. Zhu, Jun Chen, Lianyou Shan, J. M. Zhang, C. D. Fu, Z. J. Sun, J. Y. Zhang, Lei Zhang, Ning Zhou, Y. J. Zhang, J. J. He, G. Rong, Q. M. Zhu, J. W. Zhang, Z. P. Mao, P. L. Wang, D. H. Zhang, Z. Y. Deng, Meng Wang, C. S. Yu, J. F. Chang, Hongbo Liao, Y. C. Xu, Y. K. Heng, Y. Y. Zhang, M. Z. Wang, Zheng Wang, X. C. Zhong, Yiyun Zhang, Xintong Li, X. H. He, X. X. Xie, H. S. Sun, D. L. Shen, Y. X. Ye, Haiping Peng, Y. P. Chu, Z. X. Liu, X. B. Ji, C. X. Liu, X. Y. Zhang, F. A. Harris, R. G. Liu, J. C. Chen, Chun-Hua Jiang, J. B. Liu, J. Nie, J. Fang, L. S. Zheng, Zujian Wang, Y. S. Dai, C. S. Gao, Jinxing Zheng, Z. P. Zhang, B. X. Zhang, Jiming Yang, W. R. Zhao, F. Liu, H. Y. Sheng, Yudan Wang, Y. N. Gao, G. R. Lu, Z. A. Zhu, Z. P. Zheng, Xiru Huang, Y. X. Yang, N. D. Qi, G. L. Tong, B. A. Zhuang, L. L. Ma, S. Q. Zhang, Z. A. Liu, Feng Shi, Y. Ban, Y. Z. Sun, J. Z. Bai, M. H. Ye, Guangzhao Zhou, S. M. Li, Fan Yang, Bing Zhou, L. Y. Dong, J. B. Zhao, X. Y. Shen, Q. J. Li, Huirun Chen, X. H. Mo, C. Z. Yuan, and Zhe Wang
Subjects: Physics, Nuclear and High Energy Physics, Particle physics
Published: 2004

397. Observation of two new N* peaks in J/psi--ppi-n and ppi+n decays

Author: M, Ablikim, J Z, Bai, Y, Ban, J G, Bian, X, Cai, J F, Chang, H F, Chen, H S, Chen, H X, Chen, J C, Chen, Jin, Chen, Jun, Chen, M L, Chen, Y B, Chen, S P, Chi, Y P, Chu, X Z, Cui, H L, Dai, Y S, Dai, Z Y, Deng, L Y, Dong, S X, Du, Z Z, Du, J, Fang, S S, Fang, C D, Fu, H Y, Fu, C S, Gao, Y N, Gao, M Y, Gong, W X, Gong, S D, Gu, Y N, Guo, Y Q, Guo, Z J, Guo, F A, Harris, K L, He, M, He, X, He, Y K, Heng, H M, Hu, T, Hu, G S, Huang, L, Huang, X P, Huang, X B, Ji, Q Y, Jia, C H, Jiang, X S, Jiang, D P, Jin, S, Jin, Y, Jin, Y F, Lai, F, Li, G, Li, H B, Li, H H, Li, J, Li, J C, Li, Q J, Li, R B, Li, R Y, Li, S M, Li, W G, Li, X L, Li, X Q, Li, X S, Li, Y F, Liang, H B, Liao, C X, Liu, F, Liu, Fang, Liu, H M, Liu, J B, Liu, J P, Liu, R G, Liu, Z A, Liu, Z X, Liu, F, Lu, G R, Lu, J G, Lu, C L, Luo, X L, Luo, F C, Ma, J M, Ma, L L, Ma, Q M, Ma, X Y, Ma, Z P, Mao, X H, Mo, J, Nie, Z D, Nie, S L, Olsen, H P, Peng, N D, Qi, C D, Qian, H, Qin, J F, Qiu, Z Y, Ren, G, Rong, L Y, Shan, L, Shang, D L, Shen, X Y, Shen, H Y, Sheng, F, Shi, X, Shi, H S, Sun, S S, Sun, Y Z, Sun, Z J, Sun, X, Tang, N, Tao, Y R, Tian, G L, Tong, G S, Varner, D Y, Wang, J X, Wang, J Z, Wang, K, Wang, L, Wang, L S, Wang, M, Wang, P, Wang, P L, Wang, S Z, Wang, W F, Wang, Y F, Wang, Zhe, Wang, Z, Wang, Zheng, Wang, Z Y, Wang, C L, Wei, D H, Wei, N, Wu, Y M, Wu, X M, Xia, X X, Xie, B, Xin, G F, Xu, H, Xu, Y, Xu, S T, Xue, M L, Yan, F, Yang, H X, Yang, J, Yang, S D, Yang, Y X, Yang, M, Ye, M H, Ye, Y X, Ye, L H, Yi, Z Y, Yi, C S, Yu, G W, Yu, C Z, Yuan, J M, Yuan, Y, Yuan, Q, Yue, S L, Zang, Yu, Zeng, Y, Zeng, B X, Zhang, B Y, Zhang, C C, Zhang, D H, Zhang, H Y, Zhang, J, Zhang, J Y, Zhang, J W, Zhang, L S, Zhang, Q J, Zhang, S Q, Zhang, X M, Zhang, X Y, Zhang, Y J, Zhang, Y Y, Zhang, Yiyun, Zhang, Z P, Zhang, Z Q, Zhang, D X, Zhao, J B, Zhao, J W, Zhao, M G, Zhao, P P, Zhao, W R, Zhao, X J, Zhao, Y B, Zhao, Z G, Zhao, H Q, Zheng, J P, Zheng, L S, Zheng, Z P, Zheng, X C, Zhong, B Q, Zhou, G M, Zhou, 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, and B S, Zou
Abstract: The decay J/psi--NNpi provides an effective isospin 1/2 filter for the piN system due to isospin conservation. Using 58x10(6) J/psi decays collected with the Beijing Electromagnetic Spectrometer at the Beijing Electron Positron Collider, more than 100 thousand J/psi--ppi-n+c.c. events are obtained. Besides the two well-known N* peaks at around 1500 MeV/c2 and 1670 MeV/c2, there are two new, clear N* peaks in the ppi invariant mass spectrum around 1360 MeV/c2 and 2030 MeV/c2 with statistical significance of 11sigma and 13sigma, respectively. We identify these as the first direct observation of the N*(1440) peak and a long-sought missing N* peak above 2 GeV/c2 in the piN invariant mass spectrum.
Published: 2004

398. Measurement of inclusive momentum spectra and multiplicity distributions of charged particles ats∼2–5GeV

Author: Y. X. Yang, S. Q. Zhang, Z. G. Zhao, Y. Z. Sun, L. Huang, F. Li, Z. J. Sun, F. C. Ma, H. Y. Sheng, R. B. Li, M. L. Gao, Z. P. Zheng, X. Tang, N. D. Qi, W. Dunwoodie, Y. Zeng, X. Y. Zhang, W. D. Li, R. G. Liu, L. P. Fu, J. B. Liu, C. L. Luo, L. L. Ma, Houbing Lu, S. T. Xue, Xiru Huang, Z. A. Liu, W. R. Zhao, X. Q. Li, G. L. Tong, J. F. Qiu, C. C. Zhang, Y. Ban, F. Liu, B. A. Zhuang, S. D. Gu, Fang Liu, Y. Jin, Q. Yue, Y. N. Gao, Yingchun Zhu, J. C. Li, Q. J. Li, J. Z. Bai, X. S. Jiang, J. W. Zhao, B.S. Zou, Y. Q. Guo, D. Kong, Jiming Yang, G. W. Yu, L. S. Wang, Z. Z. Du, M. Y. Gong, Huirun Chen, Y. B. Chen, Y. C. Zhu, Y. P. Chu, Zheng Wang, Z. X. Liu, X. B. Ji, S. L. Olsen, X. H. Mo, P. L. Wang, S. S. Fang, Y. F. Lai, M. H. Ye, D. X. Zhao, B. Y. Zhang, H. F. Chen, Meng Wang, J. C. Chen, W. F. Wang, Z. Y. Wang, Hangxu Li, Xuanhong Lou, R. Malchow, Jiemin Li, Fan Yang, Y. B. Liu, Yudan Wang, S. Q. Tang, J. Fang, Bing Zhou, G. S. Varner, Qingying Jia, L. S. Zheng, H. Y. Zhang, X. C. Meng, L. W. Song, Y. N. Guo, S. P. Chi, X. L. Luo, G. S. Huang, G. R. Lu, J. Ying, F. A. Harris, L. Y. Dong, J. Y. Zhang, K. L. He, Jun-Bing Ma, X. M. Xia, Chun-Hua Jiang, Z. P. Zhang, S. W. Han, K. J. Zhu, Y. J. Zhang, J. M. Yuan, Y. K. Heng, Y. Y. Zhang, J. F. Chang, Hongbo Liao, B. X. Zhang, W. H. Toki, J. M. Zhang, X. Y. Ma, Zujian Wang, Z. A. Zhu, W. X. Gong, H. Y. Fu, G. Li, J. J. He, W. B. Yan, Yang Tian, C. D. Fu, Yiyun Zhang, Y. Yuan, Y. S. Zhu, Y. X. Ye, H. M. Hu, S. X. Du, M. L. Yan, Feng Shi, Xintong Li, Y. B. Zhao, D. L. Shen, X. X. Xie, Xingzhu Cui, Jie Chen, E. C. Ma, S. S. Sun, H. S. Chen, Guangzhao Zhou, C. X. Liu, J. B. Zhao, F. Lu, X. Y. Shen, G. F. Xu, X. H. He, S. Jin, C. Z. Yuan, Zhe Wang, Qiyang Zhang, Z. J. Guo, Jiawei Zhao, Z. J. Ke, H. Shen, R. Y. Li, P. Wang, Cunfeng Wei, Y. M. Dai, D. Tian, Ning Zhou, J. W. Zhang, J. G. Lu, T. Hu, XZ（蔡翔舟） Cai, B. D. Jones, X. C. Zhong, Z. D. Nie, J. Z. Wang, Y. F. Liang, D. P. Jin, J. G. Bian, D. H. Zhang, C. S. Yu, K. J. Li, W. G. Li, S. D. Yang, C. D. Qian, H. M. Liu, P. P. Zhao, H. L. Dai, Lei Zhang, Joseph Izen, G. Rong, H. X. Yang, Q. M. Zhu, Y. C. Xu, J. P. Liu, M. Z. Wang, G. A. Yang, H. S. Sun, Haiping Peng, J. Nie, Y. S. Dai, C. S. Gao, Jinxing Zheng, Miao He, L. P. Zhou, Z. P. Mao, S. L. Zang, and N. Wu
Subjects: Nuclear physics, Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, High energy, Electron–positron annihilation, High Energy Physics::Experiment, Astrophysics::Cosmology and Extragalactic Astrophysics, Multiplicity (chemistry), Spectral line, Charged particle
Abstract: Inclusive momentum spectra and multiplicity distributions of charged particles measured with the BESII detector at center of mass energies of 2.2, 2.6, 3.0, 3.2, 4.6 and 4.8 GeV are presented. Values of the second binomial moment ${R}_{2}$ obtained from the multiplicity distributions are reported. These results are compared with both experimental data from high energy ${e}^{+}{e}^{\ensuremath{-}},$ ep, and $p\overline{p}$ experiments and QCD calculations.
Published: 2004

399. Measurements ofψ(2S)decays into vector-tensor final states

Author: J. Z. Bai, Y. Ban, J. G. Bian, X. Cai, J. F. Chang, H. F. Chen, H. S. Chen, H. X. Chen, J. Chen, J. C. Chen, Jun Chen, M. L. Chen, Y. B. Chen, S. P. Chi, Y. P. Chu, X. Z. Cui, H. L. Dai, Y. S. Dai, Z. Y. Deng, L. Y. Dong, S. X. Du, Z. Z. Du, J. Fang, S. S. Fang, C. D. Fu, H. Y. Fu, L. P. Fu, C. S. Gao, M. L. Gao, Y. N. Gao, M. Y. Gong, W. X. Gong, S. D. Gu, Y. N. Guo, Y. Q. Guo, Z. J. Guo, S. W. Han, F. A. Harris, J. He, K. L. He, M. He, X. He, Y. K. Heng, H. M. Hu, T. Hu, G. S. Huang, L. Huang, X. P. Huang, X. B. Ji, Q. Y. Jia, C. H. Jiang, X. S. Jiang, D. P. Jin, S. Jin, Y. Jin, Y. F. Lai, F. Li, G. Li, H. H. Li, J. Li, J. C. Li, Q. J. Li, R. B. Li, R. Y. Li, S. M. Li, W. Li, W. G. Li, X. L. Li, X. Q. Li, X. S. Li, Y. F. Liang, H. B. Liao, C. X. Liu, Fang Liu, F. Liu, H. M. Liu, J. B. Liu, J. P. Liu, R. G. Liu, Y. Liu, Z. A. Liu, Z. X. Liu, G. R. Lu, F. Lu, J. G. Lu, C. L. Luo, X. L. Luo, F. C. Ma, J. M. Ma, L. L. Ma, X. Y. Ma, Z. P. Mao, X. C. Meng, X. H. Mo, J. Nie, Z. D. Nie, S. L. Olsen, H. P. Peng, N. D. Qi, C. D. Qian, H. Qin, J. F. Qiu, Z. Y. Ren, G. Rong, L. Y. Shan, L. Shang, D. L. Shen, X. Y. Shen, H. Y. Sheng, F. Shi, X. Shi, L. W. Song, H. S. Sun, S. S. Sun, Y. Z. Sun, Z. J. Sun, X. Tang, N. Tao, Y. R. Tian, G. L. Tong, G. S. Varner, D. Y. Wang, J. Z. Wang, L. Wang, L. S. Wang, M. Wang, Meng Wang, P. Wang, P. L. Wang, S. Z. Wang, W. F. Wang, Y. F. Wang, Zhe Wang, Z. Wang, Zheng Wang, Z. Y. Wang, C. L. Wei, N. Wu, Y. M. Wu, X. M. Xia, X. X. Xie, B. Xin, G. F. Xu, H. Xu, Y. Xu, S. T. Xue, M. L. Yan, W. B. Yan, F. Yang, H. X. Yang, J. Yang, S. D. Yang, Y. X. Yang, L. H. Yi, Z. Y. Yi, M. Ye, M. H. Ye, Y. X. Ye, C. S. Yu, G. W. Yu, C. Z. Yuan, J. M. Yuan, Y. Yuan, Q. Yue, S. L. Zang, Y. Zeng, B. X. Zhang, B. Y. Zhang, C. C. Zhang, D. H. Zhang, H. Y. Zhang, J. Zhang, J. M. Zhang, J. Y. Zhang, J. W. Zhang, L. S. Zhang, Q. J. Zhang, S. Q. Zhang, X. M. Zhang, X. Y. Zhang, Yiyun Zhang, Y. J. Zhang, Y. Y. Zhang, Z. P. Zhang, Z. Q. Zhang, D. X. Zhao, J. B. Zhao, J. W. Zhao, P. P. Zhao, W. R. Zhao, X. J. Zhao, Y. B. Zhao, Z. G. Zhao, H. Q. Zheng, J. P. Zheng, L. S. Zheng, Z. P. Zheng, X. C. Zhong, B. Q. Zhou, G. M. Zhou, L. Zhou, N. F. Zhou, K. J. Zhu, Q. M. Zhu, Yingchun Zhu, Y. C. Zhu, Y. S. Zhu, Z. A. Zhu, B. A. Zhuang, and B. S. Zou
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, High Energy Physics::Experiment, Atomic physics, High Energy Physics - Experiment
Abstract: Decays of the $\psi(2S)$ into vector plus tensor meson final states have been studied with 14 million $\psi(2S)$ events collected with the BESII detector. Branching fractions of $\psi(2S) \rt \omega f_{2}(1270)$, $\rho a_2(1320)$, $K^*(892)^0\bar{K}^*_2(1430)^0+c.c.$ and $\phi f_2^{\prime}(1525)$ are determined. They improve upon previous BESI results and confirm the violation of the "12%" rule for $\psi(2S)$ decays to VT channels with higher precision., Comment: 7 pages, 7 figures and 2 tables
Published: 2004

400. Observation of the Decayψ(2S)→KS0KL0

Author: J. Z. Bai, Y. Ban, J. G. Bian, X. Cai, J. F. Chang, H. F. Chen, H. S. Chen, H. X. Chen, J. Chen, J. C. Chen, Jun Chen, M. L. Chen, Y. B. Chen, S. P. Chi, Y. P. Chu, X. Z. Cui, H. L. Dai, Y. S. Dai, Z. Y. Deng, L. Y. Dong, S. X. Du, Z. Z. Du, J. Fang, S. S. Fang, C. D. Fu, H. Y. Fu, L. P. Fu, C. S. Gao, M. L. Gao, Y. N. Gao, M. Y. Gong, W. X. Gong, S. D. Gu, Y. N. Guo, Y. Q. Guo, Z. J. Guo, S. W. Han, F. A. Harris, J. He, K. L. He, M. He, X. He, Y. K. Heng, H. M. Hu, T. Hu, G. S. Huang, L. Huang, X. P. Huang, X. B. Ji, Q. Y. Jia, C. H. Jiang, X. S. Jiang, D. P. Jin, S. Jin, Y. Jin, Y. F. Lai, F. Li, G. Li, H. H. Li, J. Li, J. C. Li, Q. J. Li, R. B. Li, R. Y. Li, S. M. Li, W. Li, W. G. Li, X. L. Li, X. Q. Li, X. S. Li, Y. F. Liang, H. B. Liao, C. X. Liu, Fang Liu, F. Liu, H. M. Liu, J. B. Liu, J. P. Liu, R. G. Liu, Y. Liu, Z. A. Liu, Z. X. Liu, G. R. Lu, F. Lu, J. G. Lu, C. L. Luo, X. L. Luo, F. C. Ma, J. M. Ma, L. L. Ma, X. Y. Ma, Z. P. Mao, X. C. Meng, X. H. Mo, J. Nie, Z. D. Nie, S. L. Olsen, H. P. Peng, N. D. Qi, C. D. Qian, H. Qin, J. F. Qiu, Z. Y. Ren, G. Rong, L. Y. Shan, L. Shang, D. L. Shen, X. Y. Shen, H. Y. Sheng, F. Shi, X. Shi, L. W. Song, H. S. Sun, S. S. Sun, Y. Z. Sun, Z. J. Sun, X. Tang, N. Tao, Y. R. Tian, G. L. Tong, G. S. Varner, D. Y. Wang, J. Z. Wang, L. Wang, L. S. Wang, M. Wang, Meng Wang, P. Wang, P. L. Wang, S. Z. Wang, W. F. Wang, Y. F. Wang, Zhe Wang, Z. Wang, Zheng Wang, Z. Y. Wang, C. L. Wei, N. Wu, Y. M. Wu, X. M. Xia, X. X. Xie, B. Xin, G. F. Xu, H. Xu, Y. Xu, S. T. Xue, M. L. Yan, W. B. Yan, F. Yang, H. X. Yang, J. Yang, S. D. Yang, Y. X. Yang, L. H. Yi, Z. Y. Yi, M. Ye, M. H. Ye, Y. X. Ye, C. S. Yu, G. W. Yu, C. Z. Yuan, J. M. Yuan, Y. Yuan, Q. Yue, S. L. Zang, Y. Zeng, B. X. Zhang, B. Y. Zhang, C. C. Zhang, D. H. Zhang, H. Y. Zhang, J. Zhang, J. M. Zhang, J. Y. Zhang, J. W. Zhang, L. S. Zhang, Q. J. Zhang, S. Q. Zhang, X. M. Zhang, X. Y. Zhang, Yiyun Zhang, Y. J. Zhang, Y. Y. Zhang, Z. P. Zhang, Z. Q. Zhang, D. X. Zhao, J. B. Zhao, J. W. Zhao, P. P. Zhao, W. R. Zhao, X. J. Zhao, Y. B. Zhao, Z. G. Zhao, H. Q. Zheng, J. P. Zheng, L. S. Zheng, Z. P. Zheng, X. C. Zhong, B. Q. Zhou, G. M. Zhou, L. Zhou, N. F. Zhou, K. J. Zhu, Q. M. Zhu, Yingchun Zhu, Y. C. Zhu, Y. S. Zhu, Z. A. Zhu, B. A. Zhuang, and B. S. Zou
Subjects: Nuclear physics, Physics, Particle physics, Amplitude, Annihilation, Branching fraction, Electron–positron annihilation, General Physics and Astronomy, Perturbative QCD, High Energy Physics::Experiment, Relative phase, Pseudoscalar meson
Abstract: The decay psi(2S)-->(KSKL0)-K-0 is observed using psi(2S) data collected with the Beijing Spectrometer at the Beijing Electron-Positron Collider; the branching fraction is determined to be B(psi(2S)-->(KSKL0)-K-0)=(5.24+/-0.47+/-0.48)x10(-5). Compared with J/psi-->(KSKL0)-K-0, the psi(2S) branching fraction is enhanced relative to the prediction of the perturbative QCD "12%" rule. The result, together with the branching fractions of psi(2S) decays to other pseudoscalar meson pairs (pi(+)pi(-) and K+K-), is used to investigate the relative phase between the three-gluon and the one-photon annihilation amplitudes of psi(2S) decays.
Published: 2004

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