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479 results on '"S. M. Li"'

251. Measurements ofJ/ψandψ(2S)decays intoΛΛ¯π0andΛΛ¯η

Author: S. D. Gu, G. S. Varner, Huirun Chen, H. B. Li, S. S. Sun, C. L. Luo, L. L. Ma, Q. M. Zhu, C. C. Zhang, L. S. Wang, M. G. Zhao, Z. A. Liu, Y. C. Xu, B.S. Zou, S. L. Olsen, Z. Y. Wang, X. H. Mo, S. L. Zang, M. H. Ye, Y. C. Lou, Y. Ban, W. G. Li, M. Z. Wang, L. L. Wang, H. S. Sun, X. S. Jiang, G. F. Xu, S. Jin, D. Y. Wang, X. N. Li, Jian Liu, H. Y. Zhang, G. S. Huang, K. L. He, X. Q. Li, H. H. Liu, H. Q. Zhang, J. C. Li, S. H. Zhang, X. Y. Shen, J. Z. Bai, Y. T. Gu, H. M. Liu, X. Y. Zhang, R. G. Liu, Shang Lunlin, J. Y. Zhang, J. B. Liu, Z. P. Zheng, Y. C. Zhu, Xichao Ruan, G. Li, Jin Chen, Xuai Zhuang, P. L. Wang, J. Nie, Y. K. Heng, Han-Qing Zheng, Zujian Wang, Zheng Wang, C. D. Fu, D. H. Wei, B. J. Liu, L. Y. Diao, H. Y. Sheng, Z. Y. Deng, P. Wang, J. Hou, H. M. Hu, Y. X. Yang, Yudan Wang, S. S. Fang, J. B. Jiao, Y. S. Dai, C. S. Gao, G. R. Lu, H. X. Yang, P. P. Zhao, Fang Liu, J. C. Chen, H. Qin, N. D. Qi, F. A. Harris, Z. P. Zhang, Z. G. Zhao, Jinxing Zheng, D. L. Shen, Z. A. Zhu, G. L. Tong, R. G. Ping, F. C. Ma, J. Fang, D. X. Zhao, X. T. Huang, Z. J. Guo, G. Rong, B. Y. Zhang, C. X. Liu, Y. P. Chu, X. P. Xu, X. B. Ji, M. Ablikim, B. A. Zhuang, Z. J. Sun, X. Y. Jiang, J. G. Lu, Y. Z. Sun, Miao He, Y. F. Liang, C. P. Shen, J. F. Qiu, D. P. Jin, Y. N. Guo, T. Hu, H. S. Chen, XZ（蔡翔舟） Cai, J. P. Liu, Q. M. Ma, L. P. Zhou, D. H. Zhang, K. J. Zhu, X. L. Li, X. X. Xie, Y. Yuan, Y. S. Zhu, Z. Y. Ren, Z. P. Mao, X. M. Xia, Lianyou Shan, Q. Liu, Z. X. Zhang, F. Lu, Hongbo Liao, B. X. Zhang, W. R. Zhao, Yiyun Zhang, F. Liu, Y. X. Ye, Y. N. Gao, R. Y. Li, Cunfeng Wei, Q. F. Dong, J. W. Zhang, Junhui Hu, S. X. Du, H. L. Ma, S. M. Li, M. L. Yan, C. Z. Yuan, Y. Weng, X. Tang, W. D. Li, J. W. Zhao, G. W. Yu, Y. Zeng, Y. B. Chen, Y. F. Lai, H. F. Chen, W. F. Wang, and N. Wu
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics
Published: 2007
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252. Search for the invisible decay of J/psi in psi(2S) --pi(+)pi(-) J/psi

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, Y P, Chu, 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, Z J, Guo, F A, Harris, K L, He, M, He, Y K, Heng, J, Hou, H M, Hu, J H, Hu, T, Hu, X T, Huang, X B, Ji, X S, Jiang, X Y, Jiang, J B, Jiao, D P, Jin, S, Jin, Y, Jin, Y F, Lai, G, Li, H B, 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 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, Jian, 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, Z P, Mao, X H, Mo, J, Nie, S L, Olsen, R G, Ping, N D, Qi, H, Qin, J F, Qiu, Z Y, Ren, G, Rong, X D, Ruan, L Y, Shan, L, Shang, C P, Shen, D L, Shen, X Y, Shen, H Y, Sheng, H S, Sun, S S, Sun, Y Z, Sun, Z J, Sun, X, Tang, G L, Tong, G S, Varner, D Y, Wang, L, Wang, L L, Wang, L S, Wang, M, Wang, P, Wang, P L, Wang, Y F, Wang, Z, Wang, Z Y, Wang, Zheng, Wang, C L, Wei, D H, Wei, U, Wiedner, Y, Weng, N, Wu, X M, Xia, X X, Xie, G F, Xu, X P, Xu, Y, Xu, M L, Yan, H X, Yang, Y X, Yang, M H, Ye, Y X, Ye, G W, Yu, C Z, Yuan, Y, Yuan, S L, Zang, Y, 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 Y, Zhang, Yiyun, Zhang, Z X, Zhang, Z P, Zhang, D X, Zhao, J W, Zhao, M G, Zhao, P P, Zhao, W R, Zhao, Z G, Zhao, H Q, Zheng, J P, Zheng, Z P, Zheng, L, Zhou, K J, Zhu, Q M, Zhu, Y C, Zhu, Y S, Zhu, Z A, Zhu, B A, Zhuang, X A, Zhuang, and B S, Zou
Abstract: Using psi(2S) --pi(+)pi(-) J/psi events in a sample of 14.0 x 10(6) psi(2S) decays collected with the BES-II detector, a search for the decay of the J/psi to invisible final states is performed. No signal is found, and an upper limit at the 90% confidence level is determined to be 1.2 x 10(-2) for the ratio B(J/psi --invisible)/B(J/psi--mu(+)mu(-)). This is the first search for J/psi decays to invisible final states.
Published: 2007

253. Supplementary material to 'Reversible and irreversible processing of biogenic olefins on acidic aerosols'

Author: J. Liggio and S.-M. Li
Published: 2007
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254. Reversible and irreversible processing of biogenic olefins on acidic aerosols

Author: J. Liggio and S.-M. Li
Subjects: lcsh:Chemistry, lcsh:QD1-999, lcsh:Physics, lcsh:QC1-999
Abstract: Recent evidence has suggested that heterogeneous chemistry of oxygenated hydrocarbons, primarily carbonyls, plays a role in the formation of secondary organic aerosol (SOA); however, evidence is emerging that direct uptake of alkenes on acidic aerosols does occur and can contribute to SOA formation. In the present study, significant uptake of monoterpenes, oxygenated monoterpenes and sesquiterpenes to acidic sulfate aerosols is found under various conditions in a reaction chamber. Proton transfer mass spectrometry is used to quantify the organic gases, while an aerosol mass spectrometer is used to quantify the organic mass uptake and obtain structural information for heterogeneous products. Aerosol mass spectra are consistent with several mechanisms including acid catalyzed olefin hydration, cationic polymerization and organic ether formation, while measurable decreases in the sulfate mass on a per particle basis suggest that the formation of organosulfate compounds is also likely. A portion of the heterogeneous reactions appears to be reversible, consistent with reversible olefin hydration reactions. A slow increase in the organic mass after a fast initial uptake is attributed to irreversible reactions, consistent with polymerization and organosulfate formation. Uptake coefficients (γ) were estimated for a fast initial uptake governed by the mass accommodation coefficient (α) and ranged from 1×10-6-2.5×10-2. Uptake coefficients for a subsequent slower reactive uptake ranged from 1×10-7-1×10-4. These processes may potentially lead to a considerable amount of SOA from the various biogenic hydrocarbons under acidic conditions, which can be highly significant for freshly nucleated aerosols, particularly given the large array of atmospheric olefins.
Published: 2007
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255. Measurement ofψ(2S)Radiative Decays

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, Y. P. Chu, 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, Z. J. Guo, F. A. Harris, K. L. He, M. He, Y. K. Heng, J. Hou, H. M. Hu, J. H. Hu, T. Hu, G. S. Huang, X. T. Huang, X. B. Ji, X. S. Jiang, X. Y. Jiang, J. B. Jiao, D. P. Jin, S. Jin, Y. F. Lai, G. Li, H. B. 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. 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, Jian 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, Z. P. Mao, X. H. Mo, J. Nie, S. L. Olsen, R. G. Ping, N. D. Qi, H. Qin, J. F. Qiu, Z. Y. Ren, G. Rong, X. D. Ruan, L. Y. Shan, L. Shang, C. P. Shen, D. L. Shen, X. Y. Shen, H. Y. Sheng, H. S. Sun, S. S. Sun, Y. Z. Sun, Z. J. Sun, X. Tang, G. L. Tong, G. S. Varner, D. Y. Wang, L. Wang, L. L. Wang, L. S. Wang, M. Wang, P. Wang, P. L. Wang, Y. F. Wang, Z. Wang, Z. Y. Wang, Zheng Wang, C. L. Wei, D. H. Wei, Y. Weng, N. Wu, X. M. Xia, X. X. Xie, G. F. Xu, X. P. Xu, Y. Xu, M. L. Yan, H. X. Yang, Y. X. Yang, M. H. Ye, Y. X. Ye, G. W. Yu, C. Z. Yuan, Y. Yuan, S. L. Zang, Y. 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. Y. Zhang, Yiyun Zhang, Z. X. Zhang, Z. P. Zhang, D. X. Zhao, J. W. Zhao, M. G. Zhao, P. P. Zhao, W. R. Zhao, Z. G. Zhao, H. Q. Zheng, J. P. Zheng, Z. P. Zheng, L. Zhou, K. J. Zhu, Q. M. Zhu, Y. C. Zhu, Y. S. Zhu, Z. A. Zhu, B. A. Zhuang, X. A. Zhuang, and B. S. Zou
Subjects: Physics, Crystallography, Particle decay, Particle physics, Pair production, Meson, Branching fraction, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Electron–positron annihilation, Hadron, General Physics and Astronomy, Omega, Dimensionless quantity
Abstract: Using 14x10{sup 6} {psi}(2S) events accumulated at the BESII detector, we report first measurements of branching fractions or upper limits for {psi}(2S) decays into {gamma}pp, {gamma}2({pi}{sup +}{pi}{sup -}), {gamma}K{sub S}{sup 0}K{sup +}{pi}{sup -}+c.c., {gamma}K{sup +}K{sup -}{pi}{sup +}{pi}{sup -}, {gamma}K*{sup 0}K{sup -}{pi}{sup +}+c.c., {gamma}K*{sup 0}K*{sup 0}, {gamma}{pi}{sup +}{pi}{sup -}pp, {gamma}2(K{sup +}K{sup -}), {gamma}3({pi}{sup +}{pi}{sup -}), and {gamma}2({pi}{sup +}{pi}{sup -})K{sup +}K{sup -} with the invariant mass of hadrons below 2.9 GeV/c{sup 2}. We also report branching fractions of {psi}(2S) decays into 2({pi}{sup +}{pi}{sup -}){pi}{sup 0}, {omega}{pi}{sup +}{pi}{sup -}, {omega}f{sub 2}(1270), b{sub 1}{sup {+-}}{pi}{sup {+-}}, and {pi}{sup 0}2({pi}{sup +}{pi}{sup -})K{sup +}K{sup -}.
Published: 2007
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256. Evolution and molecular epidemiology of H9N2 influenza A viruses from quail in southern China, 2000 to 2005

Author: Robert G. Webster, H. Tai, Joseph S. M. Peiris, K. M. Xu, Yi Guan, Gavin J. D. Smith, Jinxia Zhang, Kenneth S. M. Li, Honglin Chen, and J. W. Li
Subjects: China, viruses, Immunology, Amino Acid Motifs, Molecular Sequence Data, Biology, medicine.disease_cause, Microbiology, Quail, Virus, Evolution, Molecular, Phylogenetics, Virology, biology.animal, Genotype, medicine, Influenza A Virus, H9N2 Subtype, Prevalence, Animals, Amino Acid Sequence, Phylogeny, Molecular Epidemiology, Molecular epidemiology, Influenza A Virus, H5N1 Subtype, Sequence Homology, Amino Acid, Host (biology), Bird Diseases, Hemagglutination Inhibition Tests, Influenza A virus subtype H5N1, Genetic Diversity and Evolution, Insect Science, Influenza in Birds, Viral disease
Abstract: H9N2 influenza viruses have become established and maintain long-term endemicity in terrestrial poultry in Asian countries. Occasionally these viruses transmit to other mammals, including humans. Increasing epidemiological and laboratory findings suggest that quail may be an important host, as they are susceptible to different subtypes of influenza viruses. To better understand the role of quail in influenza virus ecology and evolution, H9N2 viruses isolated from quail during 2000 to 2005 were antigenically and genetically characterized. Our results showed that H9N2 viruses are prevalent year-round in southern China and replicate mainly asymptomatically in the respiratory tract of quail. Genetic analysis revealed that both the G1-like and Ck/Bei-like H9N2 lineages were cocirculating in quail since 2000. Phylogenetic analyses demonstrated that most of the isolates tested were double- or multiple-reassortant variants, with four G1-like and 16 Ck/Bei-like genotypes recognized. A novel genotype of G1-like virus became predominant in quail since 2003, while multiple Ck/Bei-like genotypes were introduced into quail, wherein they incorporated G1-like gene segments, but none of them became established in this host. Those Ck/Bei-like reassortants generated in quail have then been introduced into other poultry. These complex interactions form a two-way transmission system between quail and other types of poultry. The present study provides evidence that H9N2 and H5N1 subtype viruses have also exchanged gene segments to generate currently circulating reassortants of both subtypes that have pandemic potential. Continuing influenza virus surveillance in poultry is critical to understanding the genesis and emergence of potentially pandemic strains in this region.
Published: 2006

257. 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
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258. 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
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259. 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
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260. 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
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261. 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

262. 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
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263. 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
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264. 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
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265. 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

266. 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

267. 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
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268. 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

269. 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
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270. 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
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271. Measurements ofJ/ψdecays intoωπ0,ωη, andωη′

Author: G. S. Huang, J. Y. Zhang, J. G. Lu, Y. K. Heng, W. G. Li, T. Hu, XZ（蔡翔舟） Cai, J. W. Zhao, G. W. Yu, D. Y. Wang, X. L. Li, B.S. Zou, Lianyou Shan, Xunchao Zhang, Z. G. Zhao, H. M. Liu, F. C. Ma, F. Lu, S. D. Gu, L. S. Wang, Z. J. Guo, M. G. Zhao, N. Wu, Z. J. Sun, J. P. Liu, Y. F. Liang, J. F. Qiu, R. Y. Li, D. P. Jin, Bo Xin, Cunfeng Wei, Q. F. Dong, H. X. Yang, Ning Zhou, G. S. Varner, J. W. Zhang, X. B. Ma, Xuai Zhuang, W. D. Li, J. Nie, Yingchun Zhu, G. F. Xu, Y. S. Dai, J. G. Bian, Zheng Wang, D. H. Zhang, C. S. Gao, Jinxing Zheng, H. S. Chen, S. Jin, H. H. Liu, J. C. Li, Z. Y. Yi, Zujian Wang, Z. Y. Ren, Q. M. Zhu, C. Z. Yuan, Zhe Wang, Y. C. Xu, P. P. Zhao, Y. Li, Qiyang Zhang, M. Z. Wang, Z. Y. Zhang, S. L. Zang, X. Q. Li, H. S. Sun, Y. N. Guo, Han-Qing Zheng, X. T. Huang, Y. C. Zhu, G. Rong, J. C. Chen, Fang Liu, P. Wang, Haiping Peng, Hongbo Liao, P. L. Wang, H. M. Hu, H. Qin, X. Tang, H. B. Li, C. L. Luo, Houbing Lu, Miao He, Q. M. Ma, L. P. Zhou, Yi Jin, C. C. Zhang, D. X. Zhao, Z. P. Mao, Yiyun Zhang, B. Y. Zhang, F. A. Harris, J. Fang, Y. Yuan, Y. S. Zhu, Hangxu Li, Z. P. Zhang, Y. X. Ye, S. P. Chi, D. L. Shen, Xingzhu Cui, K. L. He, X. S. Jiang, X. Shi, Yang Tian, C. X. Liu, S. X. Du, S. S. Sun, M. L. Yan, Y. Zeng, K. J. Zhu, J. M. Yuan, J. B. Jiao, Yu Zeng, X. M. Xia, Y. Q. Guo, Y. B. Chen, S. L. Olsen, Y. F. Lai, H. F. Chen, W. F. Wang, Z. Y. Wang, Shang Lunlin, G. Li, C. D. Fu, Z. Y. Deng, H. Y. Sheng, Z. Q. Tan, X. Y. Zhang, R. G. Liu, J. B. Liu, Y. P. Chu, X. B. Ji, N. D. Qi, L. L. Ma, Z. A. Liu, Y. Ban, X. X. Xie, J. Z. Bai, Z. Z. Du, Jin Chen, S. S. Fang, Yudan Wang, G. R. Lu, Z. A. Zhu, B. X. Zhang, Feng Shi, Jiming Yang, H. L. Ma, S. M. Li, Fan Yang, X. Y. Shen, Z. P. Zheng, Y. T. Gu, Xiru Huang, G. L. Tong, M. Ablikim, B. A. Zhuang, D. H. Wei, Jianwei Sun, L. Y. Dong, W. R. Zhao, F. Liu, Huirun Chen, Y. N. Gao, X. H. Mo, M. H. Ye, Y. X. Yang, Y. Z. Sun, and H. Y. Zhang
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Branching fraction, Electron–positron annihilation, Form factor (quantum field theory), Omega, Particle identification, Prime (order theory), Nuclear physics, Particle decay, Mass spectrum, Physics::Accelerator Physics, High Energy Physics::Experiment
Abstract: Based on 5.8x10{sup 7}J/{psi} events collected with BESII at the Beijing Electron-Positron Collider (BEPC), the decay branching fractions of J/{psi}{yields}{omega}{pi}{sup 0}, {omega}{eta}, and {omega}{eta}{sup '} are measured using different {eta} and {eta}{sup '} decay modes. The results are higher than previous measurements. The {omega}{pi}{sup 0} electromagnetic form factor is also obtained.
Published: 2006
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272. 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
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273. 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
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274. 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

275. Molecular diversity of coronaviruses in bats

Author: Kenneth S. M. Li, Susanna K. P. Lau, Patrick C. Y. Woo, Beatrice H.L. Wong, Hoi Wah Tsoi, Kwok-Hung Chan, Yi Huang, Rosana W.S. Poon, Bethanie C.K. Yip, Kwok-Yung Yuen, and Plazi
Subjects: Coronaviridae, Molecular Sequence Data, Zoology, Horseshoe bat, medicine.disease_cause, Alphacoronavirus, Article, virus-host, pathogen-host, Phylogenetics, Virology, Chiroptera, Bats, medicine, Animals, biotic relations, Viridae, Phylogeny, Coronavirus, Molecular Epidemiology, Diversity, biology, Molecular epidemiology, Phylogenetic tree, biotic associations, corona viruses, Genetic Variation, covid, pathogens, biotic interaction, biology.organism_classification, covid-19, CETAF-taskforce
Abstract: The existence of coronaviruses in bats is unknown until the recent discovery of bat-SARS-CoV in Chinese horseshoe bats and a novel group 1 coronavirus in other bat species. Among 309 bats of 13 species captured from 20 different locations in rural areas of Hong Kong over a 16-month period, coronaviruses were amplified from anal swabs of 37 (12%) bats by RT-PCR. Phylogenetic analysis of RNA-dependent-RNA-polymerase (pol) and helicase genes revealed six novel coronaviruses from six different bat species, in addition to the two previously described coronaviruses. Among the six novel coronaviruses, four were group 1 coronaviruses (bat-CoV HKU2 from Chinese horseshoe bat, bat-CoV HKU6 from rickett's big-footed bat, bat-CoV HKU7 from greater bent-winged bat and bat-CoV HKU8 from lesser bent-winged bat) and two were group 2 coronaviruses (bat-CoV HKU4 from lesser bamboo bats and bat-CoV HKU5 from Japanese pipistrelles). An astonishing diversity of coronaviruses was observed in bats.
Published: 2006

276. 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
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277. 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
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278. 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
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279. 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
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280. Severe acute respiratory syndrome coronavirus-like virus in Chinese horseshoe bats

Author: Susanna K. P. Lau, Beatrice H.L. Wong, Kwok-Yung Yuen, Yi Huang, Kwok-Hung Chan, Patrick C. Y. Woo, Hoi-Wah Tsoi, Suet Yi Leung, Kenneth S. M. Li, Samson S. Y. Wong, and Plazi
Subjects: Sequence analysis, Coronaviridae, viruses, Molecular Sequence Data, Viral Proteins - blood - genetics, Genome, Viral, Biology, Genome, Alphacoronavirus, Virus, virus-host, Chiroptera - virology, Viral Proteins, Phylogenetics, pathogen-host, Chiroptera, Animals, Amino Acid Sequence, biotic relations, Viridae, skin and connective tissue diseases, Phylogeny, Rhinolophus sinicus, Genetics, Multidisciplinary, Base Sequence, Phylogenetic tree, SARS Virus - classification - genetics - isolation & purification, biotic associations, corona viruses, virus diseases, covid, pathogens, Sequence Analysis, DNA, Biological Sciences, biology.organism_classification, biotic interaction, Virology, respiratory tract diseases, body regions, Severe acute respiratory syndrome-related coronavirus, covid-19, Civet, Hong Kong, CETAF-taskforce
Abstract: Although the finding of severe acute respiratory syndrome coronavirus (SARS-CoV) in caged palm civets from live animal markets in China has provided evidence for interspecies transmission in the genesis of the SARS epidemic, subsequent studies suggested that the civet may have served only as an amplification host for SARS-CoV. In a surveillance study for CoV in noncaged animals from the wild areas of the Hong Kong Special Administration Region, we identified a CoV closely related to SARS-CoV (bat-SARS-CoV) from 23 (39%) of 59 anal swabs of wild Chinese horseshoe bats (Rhinolophus sinicus) by using RT-PCR. Sequencing and analysis of three bat-SARS-CoV genomes from samples collected at different dates showed that bat-SARS-CoV is closely related to SARS-CoV from humans and civets. Phylogenetic analysis showed that bat-SARS-CoV formed a distinct cluster with SARS-CoV as group 2b CoV, distantly related to known group 2 CoV. Most differences between the bat-SARS-CoV and SARS-CoV genomes were observed in the spike genes, ORF 3 and ORF 8, which are the regions where most variations also were observed between human and civet SARS-CoV genomes. In addition, the presence of a 29-bp insertion in ORF 8 of bat-SARS-CoV genome, not in most human SARS-CoV genomes, suggests that it has a common ancestor with civet SARS-CoV. Antibody against recombinant bat-SARS-CoV nucleocapsid protein was detected in 84% of Chinese horse-shoe bats by using an enzyme immunoassay. Neutralizing antibody to human SARS-CoV also was detected in bats with lower viral loads. Precautions should be exercised in the handling of these animals. © 2005 by The National Academy of Sciences of the USA., link_to_OA_fulltext
Published: 2005

281. Human parainfluenza virus 4 outbreak and the role of diagnostic tests

Author: Alex K. H. Chan, Kwok-Yung Yuen, Patrick C. Y. Woo, Susanna K. P. Lau, Raymond W. H. Yung, Kenneth S. M. Li, Hoi-Wah Tsoi, Philomena Wan Ting Tse, Annie F. Y. Leung, Wing-Kin To, Kwok-Hung Chan, Paul K.S. Chan, and Wilina Lim
Subjects: Microbiology (medical), Adult, Male, Virus Cultivation, Paramyxoviridae, Adolescent, Parainfluenza Virus 4, Human - classification - genetics - isolation & purification, Antibodies, Viral, Sensitivity and Specificity, Disease Outbreaks, Virology, Chlorocebus aethiops, medicine, Cross Infection - diagnosis - epidemiology - virology, Animals, Humans, Mononegavirales, Child, Respiratory Tract Infections, Vero Cells, Cross Infection, biology, Respiratory tract infections, Rubulavirus Infections - diagnosis - epidemiology - virology, Clinical Laboratory Techniques, Reverse Transcriptase Polymerase Chain Reaction, Outbreak, Antibodies, Viral - blood, Rubulavirus Infections, Middle Aged, biology.organism_classification, Parainfluenza Virus 4, Human, Human Parainfluenza Virus, medicine.anatomical_structure, Respiratory failure, Child, Preschool, Respiratory virus, Hong Kong, Female, Respiratory tract
Abstract: Owing to the difficulties in isolating the virus and the lack of routine surveillance, the clinical significance of human parainfluenza virus 4 (HPIV-4) is less well defined than that of the other human parainfluenza viruses. We describe the first outbreak of HPIV-4 infection in a developmental disabilities unit, involving 38 institutionalized children and three staff members, during a 3-week period in autumn 2004. Most subjects had upper respiratory tract infections (URTI), while lower respiratory tract infections (LRTI) occurred in three children (7%), one complicated by respiratory failure requiring ventilation support. All patients recovered. Nasopharyngeal aspirates tested for HPIV-4 were positive by reverse transcriptase PCR (RT-PCR) in all 41 cases (100%), by direct immunofluorescence in 29 of 39 tested cases (74%), and by cell cultures in 6 of 37 cases (16%), and serum was positive for antibodies against HPIV-4 in all 35 cases (100%) with serum samples available. In addition, RT-PCR detected HPIV-4 in four children (three LRTI and one URTI) out of 115 patients with community-acquired respiratory tract infection. Molecular analysis of the 1,198-bp phosphoprotein sequences showed that HPIV-4 isolates among the cases were genetically similar, whereas the community controls were more genetically distant, supporting nosocomial transmission of a single HPIV-4 genotype during the outbreak. Moreover, the HPIV-4 causing the outbreak is more closely related to HPIV-4A than HPIV-4B. HPIV-4 may be an important cause of more severe respiratory illness in children. The present RT-PCR assay is a sensitive, specific, and rapid method for the diagnosing HPIV-4 infection. To better define the epidemiology and clinical spectrum of disease of HPIV-4 infections, HPIV-4 should be included in the routine panels of respiratory virus detection on respiratory specimens. Copyright © 2005, American Society for Microbiology. All Rights Reserved., published_or_final_version
Published: 2005

282. 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

283. 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
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284. Dynamical fission inSn124+Ni64collision at 35AMeV

Author: G. Lanzalone, M. Iacono-Manno, G. Lanzano, K. Siwek-Wilczyńska, G. Vannini, R. Dayras, S. Russo, Zhigang Xiao, F. Rizzo, S. Pirrone, E. De Filippo, D. Guinet, A. Anzalone, J.P. Wieleczko, S. Cavallaro, H. Wu, M. Trimarchi, M.F. Rivet, Lucrezia Auditore, M. Bruno, Ł. Świderski, M. L. Sperduto, Antonio Trifiro, I. Skwira, P. Russotto, R. Bougault, E. Geraci, G. Politi, J. Brzychczyk, J. Wilczynski, A. Grzeszczuk, Elio Rosato, Amalia Pop, M. Papa, J. Blicharska, Mariano Vigilante, M. D'Agostino, M. Di Toro, L. Zetta, Z. Majka, K. Schmidt, V. Baran, A. Pagano, P. Guazzoni, I. Berceanu, B. Borderie, S. Lo Nigro, F. Porto, R. Płaneta, Maria Colonna, M. B. Chatterjee, M. Sassi, J.C. Steckmeyer, J.D. Frankland, F. Giustolisi, E. Piasecki, S. Kowalski, Mihai Petrovici, E. Galichet, W. Gawlikowicz, C. Maiolino, G. Cardella, Aldo Bonasera, F. Amorini, S. M. Li, A. Chbihi, W. Zipper, N. Le Neindre, and E. La Guidara
Subjects: Physics, Nuclear and High Energy Physics, Cluster decay, 010308 nuclear & particles physics, Fission, Nuclear Theory, 0103 physical sciences, Non-equilibrium thermodynamics, Charge (physics), Atomic physics, Nuclear Experiment, 010306 general physics, 01 natural sciences
Abstract: Some properties of fast, nonequilibrium splitting of projectiles in the $^{124}\mathrm{Sn}+^{64}\mathrm{Ni}$ reaction at 35A MeV were determined using the $4\ensuremath{\pi}$ CHIMERA detector system. In particular the charge distributions, in- and out-of-plane angular distributions, and relative velocities of projectilelike fragments were measured. The time scale of the process was estimated and it turned out that the process is sequential but much faster than the ordinary, equilibrated fission.
Published: 2005
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285. 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
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286. 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
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287. 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
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288. 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
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289. Time sequence and time scale of intermediate mass fragment emission

Author: E. La Guidara, A. Chbihi, G. Vannini, M. Bruno, R. Bougault, M. Trimarchi, G. Cardella, M. L. Sperduto, I. Berceanu, S. Pirrone, M.F. Rivet, K. Schmidt, J.D. Frankland, M. B. Chatterjee, J.P. Wieleczko, B. Borderie, G. Lanzano, W. Zipper, N. Le Neindre, P. Guazzoni, L. Swiderski, E. Galichet, F. Rizzo, A. Trifirò, E. Geraci, Aldo Bonasera, S. Cavallaro, E. Piasecki, D. Guinet, C. Maiolino, S. M. Li, R. Dayras, F. Giustolisi, S. Russo, J. Blicharska, J. Cibor, Mihai Petrovici, F. Amorini, M. Papa, S. Kowalski, Maria Colonna, W. Gawlikowicz, M. D'Agostino, F. Porto, M. Sassi, P. Russotto, J. Wilczynski, Lucrezia Auditore, R. Planeta, G. Politi, Angelo Pagano, A. Grzeszczuk, Mariano Vigilante, Amalia Pop, G. Lanzalone, M. Di Toro, Zhigang Xiao, V. Baran, A. Anzalone, H. Wu, K. Siwek-Wilczyńska, E. De Filippo, I. Skwira, M. Iacono-Manno, E. Rosato, L. Zetta, Z. Majka, J. Brzychczyk, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), E., DE FILLIPPO, A., Pagano, J., Wilczynski, F., Amorini, A., Anzalone, N., Arena, L., Auditore, V., Baran, I., Berceanu, J., Blicharska, J., Brzychczyk, A., Bonasera, B., Borderie, R., Bougault, M., Bruno, G., Cardella, S., Cavallaro, M. B. CHATTERJEE A., Chbihi, J., Cibor, M., Colonna, M., D'Agostino, R., Dayra, M., DI TORO, J. D., Frankland, E., Galichet, W., Gawlikowicz, E., Geraci, F., Giustolisi, A., Grzeszczuk, P., Guazzoni, D., Guinet, M., IACONO MANNO, S., Kowalski, E., LA GUIDARA, G., Lanzan, G., Lanzalone, N., LE NEINDRE, S., Li, C., Maiolino, Z., Majka, M., Papa, M., Petrovici, E., Piasecki, S., Pirrone, R., Planeta, G., Politi, A., Pop, F., Porto, M. F., Rivet, F., Rizzo, Rosato, Elio, S., Russo, P., Russotto, M., Sassi, G., Schmidt, K., SIWEK WILCZYNSKA, I., Skwira, M. L., Sperduto, L., Swiderski, A., Trifir, M., Trimarchi, G., Vannini, Vigilante, Mariano, J. P., Wieleczko, H., Wu, Z., Xiao, L., Zetta, W., Zipper, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), E. De Filippo, A. Pagano, J. Wilczy´nski, F. Amorini, A. Anzalone, L. Auditore, V. Baran, I. Berceanu, J. Blicharska, J. Brzychczyk, A. Bonasera, B. Borderie, R. Bougault, M. Bruno, G. Cardella, S. Cavallaro, M. B. Chatterjee, A. Chbihi, J. Cibor, M. Colonna, M. D Agostino, R. Dayra, M. Di Toro, J. Frankland, E. Galichet, W. Gawlikowicz, E. Geraci, F. Giustolisi, A. Grzeszczuk, P. Guazzoni, D. Guinet, M. Iacono-Manno, S. Kowalski, E. La Guidara, G. Lanzano', G. Lanzalone, N. Le Neindre, S. Li, C. Maiolino, Z. Majka, M. Papa, M. Petrovici, E. Piasecki, S. Pirrone, R. PBaneta, G. Politi, A. Pop, F. Porto, M. F. Rivet, E. Rosato, F. Rizzo, S. Russo, P. Russotto, M. Sassi, K. Schmidt, K. Siwek-Wilczy´nska, I. Skwira, M. L. Sperduto, A. ´ Swiderski, A. Trifiro', M. Trimarchi, G. Vannini, M. Vigilante, J. P. Wieleczko, H. Wu, Z. Xiao, L. Zetta, and W. Zipper.
Subjects: Physics, Nuclear and High Energy Physics, Reaction mechanism, 010308 nuclear & particles physics, Relative velocity, Time sequence, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, 25.70.Mn, 25.70.Pq, Fragmentation (mass spectrometry), 0103 physical sciences, Heavy ion, Ion emission, Atomic physics, 010306 general physics, Nucleon, Ternary operation
Abstract: Matière Nucléaire NIM; Semiperipheral collisions in the $^{124}$Sn+${64}Ni reaction at 35 MeV/nucleon were studied using the forward part of the Charged Heavy Ion Mass and Energy Resolving Array. Nearly completely determined ternary events involving projectilelike fragments (PLF), targetlike fragments (TLF), and intermediate mass fragments (IMF) were selected. A new method of studying the reaction mechanism, focusing on the analysis of the correlations between relative velocities in the IMF+PLF and IMF+TLF subsystems, is proposed. The relative velocity correlations provide information on the time sequence and time scale of the neck fragmentation processes leading to production of IMFs. It is shown that the majority of light IMFs are produced within 40–80 fm/c after the system starts to reseparate. Heavy IMFs are formed at times of about 120 fm/c or later and can be viewed as resulting from two-step (sequential) neck rupture processes.
Published: 2005
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290. Screening the active constituents of Chinese medicinal herbs as potent inhibitors of Cdc25 tyrosine phosphatase, an activator of the mitosis-inducing p34cdc2 kinase

Author: Yang, H., Zheng, S., S. M., Li, Leclerc, S., L. L.Bach S., Yu, Knockaert, M., Reinhardt, J., Lozach, O., Schmitt, S., Baratte, B., Koken, M., S. P., Coburn, Tang, L., Jiang, T., D. C., Liang, Galons, H., J. F., Dierick, L. A., Pinna, Meggio, F., Totzke, F., Schachtele, C., Lerman, A. S., Carnero, A., Wan, Y., Gray, N., Meijer, L., J. Q., Cheng, S. Z., Zhang, Molécules et cibles thérapeutiques (MCT), Station biologique de Roscoff [Roscoff] (SBR), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Myeloid, Chinese Herbal/analysis/*chemistry/*pharmacology Humans Lethal Dose 50 Leukemia, Chronic/drug therapy/*enzymology/pathology Medicine, Medicinal/chemistry cdc25 Phosphatase/*antagonists & inhibitors/*metabolism, [SDV.BBM]Life Sciences [q-bio]/Biochemistry, Molecular Biology, Chinese Traditional/methods Mitosis/*drug effects Phytotherapy/methods Plants, Tumor Cyclin-Dependent Kinases/*metabolism Dose-Response Relationship, Drug Drugs, Apoptosis/*drug effects Cell Cycle Proteins/*antagonists & inhibitors/*metabolism Cell Line
Abstract: OBJECTIVE: To screen and evaluate the active constituents of Chinese medicinal herbs as potent inhibitors of Cdc25 phosphatase. METHODS: The affinity chromatography purified glutashione-S-transferase/Cdc25A phosphatase fusion protein and Cdc2/cyclin B from the extracts of starfish M phase oocytes are used as the cell cycle-specific targets for screening the antimitotic constituents. We tested 9 extracts isolated from the Chinese medicinal herbs and vegetables including the agents currently used in cancer treatment by measuring the inhibition of Cdc25A phosphatase and Cdc2 kinase activity. The antitumor activity of the extracts was also evaluated by MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay and flow cytometry. RESULTS: Cdc25A inhibitory activity and antitumor activity are detected in the extracts isolated from three Chinese medicinal herbs Agrimona pilosa; Herba solani lyrati; Galla chinesis. CONCLUSION: We found three extracts isolated from Chinese medicinal herbs have potential inhibitory activity of Cdc25 phosphatase using a highly specific mechanism-based screen assay for antimitotic drug discovery.
Published: 2005

291. BESII Detector Simulation

Author: Gongru Lu, Cheng-Kui Li, X. H. Mo, S. P. Chi, J. F. Chang, Guangzhao Zhou, T. Hu, XZ（蔡翔舟） Cai, S. L. Zang, H. S. Chen, J. M. Yuan, B.S. Cheng, J. B. Zhao, S.L. Olsen, Wei Li, F. C. Ma, Shengsen Sun, G. W. Yu, Lianyou Shan, Q. J. Li, Z.Z. Du, F.J. Lu, X. Y. Shen, Zhe Wang, X. C. Zhong, Bo Xin, Y. B. Chen, Hangxu Li, Y. Z. Sun, J. Chen, G. F. Xu, H.B. Liao, Yuekun Heng, J. Z. Bai, Y. Jin, Y. Q. Guo, J. F. Qiu, P. L. Wang, Y.X. Yang, Y.N. Gao, Bingxin Zhang, R. Y. Li, Yudan Wang, Nan Zhou, Y. P. Chu, Yao Zhu, M. Wang, J. Fang, Junguang Lu, X. B. Ji, Li Zhou, H. M. Hu, H. F. Chen, J. Nie, Y. Guo, Y. B. Zhao, X. J. Zhao, C. D. Qian, Q. M. Ma, H. H. Liu, Xiru Huang, Y.L. Li, Shang Lunlin, Jiehao Zhang, Z. A. Zhu, J. H. Liu, X. Q. Li, Junqiang Zhang, X. L. Luo, G. Li, H. Y. Sheng, X. B. Ma, Xuai Zhuang, Zhangli Liu, Dixin Zhao, L. H. Yi, Jianwei Sun, Yingchun Zhu, Y. M. Wu, X.L. Li, M. Ye, Y. Yuan, Juan Zhang, Yuezhao Zhang, C. D. Fu, G. S. Huang, C. Z. Yuan, C. C. Zhang, J. Z. Wang, D.L. Shen, Z. Y. Deng, Zhen Wang, Qiyang Zhang, Huai-Min Liu, H. Qin, D.H. Wei, L. Y. Dong, Weiping Wang, G.L. Tong, Hong Sun, J. W. Zhao, Y. S. Dai, J.G. Bian, J. Yang, G. S. Varner, Hangkun Xu, P. Wang, Cuishan Gao, H. Y. Fu, Y. C. Zhu, Lifang Zheng, Y. F. Liang, Y. Zeng, Xingtao Huang, Jinxing Zheng, Cunfeng Wei, S. Gu, N. Wu, C. L. Luo, D. P. Jin, Q. F. Dong, Yiyun Zhang, Yi Jin, Jun Chen, M. He, Houbing Lu, Xunchao Zhang, M. L. Chen, Jun-Bing Ma, Nongjian Tao, Xuan Zhang, L. S. Wang, F. A. Harris, C. X. Liu, Z. Liu, X. Y. Ma, W. X. Gong, J. Li, Y. X. Ye, L. L. Ma, Z.Q. Zhang, L. X. Luo, D. H. Zhang, M. G. Zhao, Yu Zeng, C. S. Yu, X. S. Jiang, Zhengguo Zhao, Y.F. Lai, X. Shi, Zheng Wang, Zhenyu Zhang, B. X. Zhang, He Kai, K. J. Zhu, Zong-Ping Zheng, M. H. Ye, M. Ablikim, Fang Liu, Z. J. Sun, M. Y. Gong, Huajian Zhang, J. C. Li, Y. Ban, S.X. Du, He-Run Yang, P.P. Zhao, Haiping Peng, N.D. Qi, W.R. Zhao, B.A. Zhuang, Kelin Wang, F. Y. Li, Z. D. Nie, J. P. Liu, Jiang Changhui, H. L. Dai, Bin Zhou, Z. P. Mao, X. H. He, H.Q. Zheng, X.M. Xia, X. X. Xie, Z.J. Guo, Qiangqiang Zhu, S. Z. Wang, X. W. Tang, Hailong Ma, Jin Chen, S. S. Fang, J. Liu, Bing-Song Zou, Z. Y. Yi, F. Liu, S. M. Li, Fan Yang, Shi-Lun Jin, S. Q. Zhang, L. L. Wang, S.T. Xue, D. Y. Wang, R.G. Liu, Z. Y. Ren, G. Rong, Xingzhu Cui, Yang Tian, M. L. Yan, and Feng Shi
Subjects: Physics, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Monte Carlo method, Detector, Computer Science::Programming Languages, FOS: Physical sciences, High Energy Physics::Experiment, Instrumentation and Detectors (physics.ins-det), Instrumentation, Computational science
Abstract: A Monte Carlo program based on Geant3 has been developed for BESII detector simulation. The organization of the program is outlined, and the digitization procedure for simulating the response of various sub-detectors is described. Comparisons with data show that the performance of the program is generally satisfactory., Comment: 17 pages, 14 figures, uses elsart.cls, to be submitted to NIMA
Published: 2005
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292. 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
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293. 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
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294. 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
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295. 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
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296. 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
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297. 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
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298. 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
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299. 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
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300. Hydrolytic degradation of PCL/PEO copolymers in alkaline media

Author: S M, Li, X H, Chen, R A, Gross, and S P, McCarthy
Abstract: PCL/PEO copolymers with different compositions were obtained from ring opening polymerization of epsilon-caprolactone in the presence of ethylene oxide and characterized by various analytical techniques. Data collected from DSC and X-ray diffractometry suggested that the copolymer chains possess a blocky structure, leading to both PCL and PEO-type crystalline structures. Hydrolytic degradation of these copolymers was carried out in a pH=10.6 carbonate buffer solution at 37 degrees C. Comparison was made with a PCL homopolymer and a PCL/PEG blend which had the same gross composition as one of the copolymers. The results showed that the presence of PEO sequences considerably enhanced the hydrophilicity of the copolymers as compared with PCL homopolymer. Nevertheless, the degradability of PCL chains was not enhanced due to the phase separation between the two components. These materials should be of great interest for biomedical uses such as matrices for sustained drug delivery because of the presence of both hydrophilic and hydrophobic microdomains.
Published: 2004

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