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1. Direct measurements of the cross sections for e+e−→hadrons|non-DD¯ in the range from 3.65 to 3.87 GeV and the branching fraction for ψ(3770)→non-DD¯

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, 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, 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, R.G. Ping, N.D. Qi, H. Qin, J.F. Qiu, Z.Y. Ren, G. Rong, X.D. Ruan, L.Y. Shan, L. Shang, 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, 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, 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, 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
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Branching fraction, Electron–positron annihilation, Hadron
Abstract

By tagging the largest energy of the assumed kaon in the final states of e + e − → hadrons , we measured the cross sections for e + e − → hadrons | non- D D ¯ in the range from 3.65 to 3.87 GeV. Analyzing these cross sections yields the branching fraction for the decay ψ ( 3770 ) → non- D D ¯ to be BF [ ψ ( 3770 ) → non- D D ¯ ] = ( 15.1 ± 5.6 ± 1.8 ) % , and the observed non- D D ¯ and D D ¯ cross sections to be σ had-non- D D ¯ obs = ( 1.08 ± 0.40 ± 0.15 ) nb and σ D D ¯ obs = ( 6.07 ± 0.40 ± 0.35 ) nb , respectively, at the center-of-mass energy E cm = 3.7724 GeV .

Published
2008
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2. Production of σ in ψ(2S)→π+π−J/ψ

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, 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 and High Energy Physics, Particle physics, Meson, Electron–positron annihilation, Mass spectrum, Pi, Sigma, Resonance, High Energy Physics::Experiment, Production (computer science), Helicity
Abstract

Using 14M psi(2S) events accumulated by BESII at the BEPC, a covariant helicity amplitude analysis is performed for psi(2S) -> pi(+)pi(-)J/psi, J/psi -> mu(+)mu(-). The pi(+)pi(-) mass spectrum, distinctly different from phase space, suggests or production in this process. Two different theoretical schemes are used in the global fit to the data. The results are consistent with the existence of the sigma. The sigma pole position is determined to be (552(-106)(+84) -i(232(-72)(+81)) MeV/c(2). (c) 2006 Elsevier B.V. All rights reserved.

Published
2007
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3. Measurements of branching fractions for inclusive K¯0/K0 and K∗(892)∓ decays of neutral and charged D mesons

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, 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, 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, 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, Meson, Analytical chemistry, Branching (polymer chemistry)
Abstract

Using the data sample of about 33 pb(-1) collected at and around 3.773 GeV with the BES-II detector at the BEPC collider, we have studied inclusive (K) over bar (0)/K-0 and K*(892) -/+ decays of D-0 and D+ mesons. The branching fractions for the inclusive (K) over bar (0)/K-0 and K*(892)(-) decays are measured to be BF(D-0, (K) over bar (0)/(KX)-X-0) = (47.6 +/- 14.8 +/- 3.0)%, BF(D-0 -> (KX)-X-0) = (60.5 +/- 15.5 +/- 3.3)%, BF(D-0, K*X-) = (15.3 +/- 8.3 +/- 1.9)% and BF(D+ -> K*X-) = (5.7 +/- 5.2 +/- 0.7)%. The upper limits of the branching fractions for the inclusive K*(892)(+) decays are set to be BF(D-0 -> K*+X) K*X+) < 20.3% at 90% confidence level. (c) 2006 Elsevier B.V. All rights reserved.

Published
2006
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4. First observation of χcJ→ωω decays

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, H.Q. Zheng, Z.G. Zhao, 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, Particle physics, Omega
Abstract

Decays of $\chi_{c0,2}\ar\ww$ are observed for the first time using a sample of $14.0\times 10^6$ $\psi(2S)$ events collected with the BESII detector. The branching ratios are determined to be ${\cal B}(\chi_{c0}\ar \ww)=(2.29\pm 0.58\pm 0.41)\times 10^{-3}$ and ${\cal B}(\chi_{c2}\ar\ww)=(1.77\pm 0.47\pm 0.36)\times 10^{-3}$, where the first errors are statistical and the second systematic. The significances of the two signals are $4.4\sigma$ and $4.7\sigma$, respectively.

Published
2005
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5. Measurements of Cabibbo-suppressed hadronic decay fractions of charmed D0 and D+ mesons

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, K.L. He, M. He, X. He, Y.K. Heng, H.M. Hu, T. Hu, 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, 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, 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, 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
Hadronic decay, Physics, Nuclear and High Energy Physics, Particle physics, Meson, Branching fraction, Electron–positron annihilation, Hadron, law.invention, Nuclear physics, Positron, law, Pi, Collider
Abstract

Using data collected with the BESII detector at Beijing Electron-Positron Collider, the measurements of relative branchin- fractions for seven Cabibbo-suppressed hadronic weak decays D-0 -> K-K+, pi-pi(+), pi(-)pi(+)pi(-) and pi-pi(+)pi(-), D-divided by -> (K) over bar K-0(divided by), K-K+pi(+) and pi(-),pi(+pi+) are presented. (c) 2005 Elsevier B.V. All rights reserved.

Published
2005
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6. Partial wave analysis of ψ′→π+π−π0 at BESII

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
Nuclear physics, Physics, Nuclear and High Energy Physics, Amplitude, Branching fraction, Partial wave analysis, Electron–positron annihilation, Hadron, Pi, Analytical chemistry, Resonance, Helicity
Abstract

The decay psi' + pi(+)pi(-)pi(0) is analyzed using a sample of 14 million psi' events taken with the BESII detector at the BEPC, and the branching fraction is measured to be B(psi' -> pi(+)pi(-)pi(0)) = (18.1 +/- 1.8 +/- 1.9) x 10(-5). A partial wave analysis is carried out using the helicity amplitude method. psi' -> rho(770)pi is observed, and the branching fraction is measured to be B(psi' -> rho(770)pi) = (5.1 +/- 0.7 +/- 1.1) x 10(-5), where the first error is statistical and the second one is systematic. A high mass enhancement with mass around 2.15 GeV/c(2) is also observed. Attributing this enhancement to the p(2150) resonance, the branching fraction is measured to be B(psi' -> rho(2150)pi -> pi(+)pi(-)pi(0)) = (19.4 +/- 2.5(-3.4)(+11.5)) x 10(-5). The results will help in the understanding of the longstanding "rho pi puzzle" between J/psi and psi' hadronic decays. (c) 2005 Elsevier B.V. All rights reserved.

Published
2005
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7. Resonances in and

Author

M. Ablikim, J.Z. Bai, Y. Ban, J.G. Bian, D.V. Bugg, 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, 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, Meson, Electron–positron annihilation, Partial wave analysis, Mass spectrum, Analytical chemistry, Dalitz plot, State (functional analysis), Scalar meson, Bar (unit)
Abstract

A partial wave analysis is presented of J/psi --> phipi(+)pi(-) and phiK(+)K(-) from a sample of 58M J/psi events in the BES II detector. The f(0)(980) is observed clearly in both sets of data, and parameters of the Flatte formula are determined accurately: M = 965 +/- 8(stat) +/- 6(syst) MeV/c(2), g(1) = 165 +/- 10 +/- 15 MeV/c(2), g(2)/g(1) = 4.21 +/- 0.25 +/- 0.21. The phipipi data also exhibit a strong pipi peak centred at M = 1335 MeV/c(2). It may be fitted with f(2)(1270) and a dominant 0(+) signal made from f(0)(1370) interfering with a smaller f(0)(1500) component. There is evidence that the f(0)(1370) signal is resonant, from interference with f(2)(1270). There is also a state in pipi with M = 1790(-30)(+40) MeV/c(2) and Gamma = 270(-30)(+60) MeV/c(2); spin 0 is preferred over spin 2. This state, f(0)(1790), is distinct from f(0)(1710). The phiK (K) over bar data contain a strong peak due to f(2)'(1525). A shoulder on its upper side may be fitted by interference between f(0)(1500) and f(0)(1710). (C) 2004 Elsevier B.V. All rights reserved.

Published
2005
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8. Study of J/ψ→ωK+K−

Author

M. Ablikim, J.Z. Bai, Y. Ban, J.G. Bian, D.V. Bugg, 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, Nuclear magnetic resonance, Branching fraction, Analytical chemistry, Dalitz plot, Omega, Bar (unit)
Abstract

New data are presented on J/psi --> omegaK(+)K(-) from a sample of 58M J/psi events in the upgraded BES II detector at the BEPC. There is a conspicuous signal for f(0)(1710) --> K+K- and a peak at higher mass which may be fitted with f(2)(2150) --> K (K) over bar. From a combined analysis with omegapi(+)pi(-) data, the branching ratio BR(f(0)(1710) --> pipi)/BR(f(0)(1710) --> K (K) over bar) is < 0.11 at the 95% confidence level. (C) 2004 Elsevier B.V. All rights reserved.

Published
2004
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9. Measurement of cross sections for D0D¯0 and D+D− production in e+e− annihilation at s=3.773 GeV

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, 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, 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 physics, Nuclear and High Energy Physics, Cross section (physics), Particle physics, Annihilation, Pair production, Electron–positron annihilation, Hadron, Extrapolation, Production (computer science), Charm (quantum number)
Abstract

The cross sections for D 0 D ¯ 0 and D + D − production at 3.773 GeV have been measured with BES-II detector at BEPC. These measurements are made by analyzing a data sample of about 17.3 pb −1 collected at the center-of-mass energy of 3.773 GeV. Observed cross sections for the charm pair production are radiatively corrected to obtain the tree level cross section for D D ¯ production. A measurement of the total tree level hadronic cross section is obtained from the tree level D D ¯ cross section and an extrapolation of the R u d s below the open charm threshold.

Published
2004
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10. The σ pole in J/ψ→ωπ+π−

Author

M. Ablikim, J.Z. Bai, Y. Ban, J.G. Bian, D.V. Bugg, 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, T.N. Ruan, 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
Nuclear physics, Systematic error, Physics, Nuclear and High Energy Physics, Angular distribution, Electron–positron annihilation, Partial wave analysis, Pi, Resonance, Sigma, Omega
Abstract

Using a sample of 58 million J/psi events recorded in the BESII detector, the decay J/psi --> omegapi(+)pi(-) is studied. There are conspicuous omegaf(2)(1270) and b(1)(1235)pi signals. At low pipi mass, a large, broad peak due to the sigma is observed, and its pole position is determined to be (541 +/- 39) - i (252 +/- 42) MeV from the mean of six analyses. The errors, which are dominated by the systematic errors, cover the statistical and systematic errors in the six analyses, as well as the observed variation of the six analyses. (C) 2004 Elsevier B.V. All rights reserved.

Published
2004
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11. A study of J/ψ→γγV(ρ,φ) decays with the BESII detector

Author

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, J. Chen, M.L. Chen, Y.B. Chen, S.P. Chi, Y.P. Chu, X.Z. Cui, H.L. Dai, Y.S. Dai, Z.Y. Deng, L.Y. Dong, S.X. Du, Z.Z. Du, J. Fang, S.S. Fang, C.D. Fu, H.Y. Fu, L.P. Fu, C.S. Gao, M.L. Gao, Y.N. Gao, M.Y. Gong, W.X. Gong, S.D. Gu, Y.N. Guo, Y.Q. Guo, S.W. Han, J. He, K.L. He, M. He, X. He, Y.K. Heng, H.M. Hu, T. Hu, G.S. Huang, L. Huang, X.P. Huang, X.B. Ji, Q.Y. Jia, C.H. Jiang, X.S. Jiang, D.P. Jin, S. Jin, Y. Jin, Y.F. Lai, F. Li, G. Li, H.H. Li, J. Li, J.C. Li, Q.J. Li, R.B. Li, R.Y. Li, S.M. Li, W. Li, W.G. Li, X.L. Li, X.Q. Li, X.S. Li, Y.F. Liang, H.B. Liao, C.X. Liu, Fang Liu, F. Liu, H.M. Liu, J.B. Liu, J.P. Liu, R.G. Liu, Y. Liu, Z.A. Liu, Z.X. Liu, G.R. Lu, F. Lu, J.G. Lu, C.L. Luo, X.L. Luo, F.C. Ma, J.M. Ma, L.L. Ma, X.Y. Ma, Z.P. Mao, X.C. Meng, X.H. Mo, J. Nie, Z.D. Nie, H.P. Peng, N.D. Qi, C.D. Qian, H. Qin, J.F. Qiu, Z.Y. Ren, G. Rong, L.Y. Shan, L. Shang, D.L. Shen, X.Y. Shen, H.Y. Sheng, F. Shi, X. Shi, L.W. Song, H.S. Sun, S.S. Sun, Y.Z. Sun, Z.J. Sun, X. Tang, N. Tao, Y.R. Tian, G.L. Tong, D.Y. Wang, J.Z. Wang, L. Wang, L.S. Wang, M. Wang, Meng Wang, P. Wang, P.L. Wang, S.Z. Wang, W.F. Wang, Y.F. Wang, Zhe Wang, Z. Wang, Zheng Wang, Z.Y. Wang, C.L. Wei, N. Wu, Y.M. Wu, X.M. Xia, X.X. Xie, B. Xin, G.F. Xu, H. Xu, Y. Xu, S.T. Xue, M.L. Yan, W.B. Yan, F. Yang, H.X. Yang, J. Yang, S.D. Yang, Y.X. Yang, L.H. Yi, Z.Y. Yi, M. Ye, M.H. Ye, Y.X. Ye, C.S. Yu, G.W. Yu, C.Z. Yuan, J.M. Yuan, Y. Yuan, Q. Yue, S.L. Zang, Y. Zeng, B.X. Zhang, B.Y. Zhang, C.C. Zhang, D.H. Zhang, H.Y. Zhang, J. Zhang, J.M. Zhang, J.Y. Zhang, J.W. Zhang, L.S. Zhang, Q.J. Zhang, S.Q. Zhang, X.M. Zhang, X.Y. Zhang, Yiyun Zhang, Y.J. Zhang, Y.Y. Zhang, Z.P. Zhang, Z.Q. Zhang, D.X. Zhao, J.B. Zhao, J.W. Zhao, P.P. Zhao, W.R. Zhao, X.J. Zhao, Y.B. Zhao, Z.G. Zhao, H.Q. Zheng, J.P. Zheng, L.S. Zheng, Z.P. Zheng, X.C. Zhong, B.Q. Zhou, G.M. Zhou, L. Zhou, N.F. Zhou, K.J. Zhu, Q.M. Zhu, Yingchun Zhu, Y.C. Zhu, Y.S. Zhu, Z.A. Zhu, B.A. Zhuang, and B.S. Zou

Subjects
Physics, Nuclear physics, Particle physics, Nuclear and High Energy Physics, Meson, Glueball, Branching fraction, Electron–positron annihilation, Detector, Mass spectrum, Radiative transfer, Resonance
Abstract

Using a sample of 58×10 6 J / ψ events collected with the BESII detector, radiative decays J / ψ → γγV , where V = ρ or φ , are studied. A resonance around 1420 MeV/ c 2 ( X (1424)) is observed in the γρ mass spectrum. Its mass and width are measured to be 1424±10(stat)±11(sys) MeV/ c 2 and 101.0±8.8±8.8 MeV/ c 2 , respectively, and its branching ratio B ( J / ψ → γX (1424)→ γγρ ) is determined to be (1.07±0.17±0.11)×10 −4 . A search for X (1424)→ γφ yields a 95% C.L. upper limit B ( J / ψ → γX (1424)→ γγφ ) −4 .

Published
2004
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12. Search for lepton flavor violation process J/ψ→eμ

Author

J.Z. Bai, Y. Ban, J.G. Bian, X. Cai, J.F. Chang, H.F. Chen, H.S. Chen, J. Chen, Jie Chen, J.C. Chen, Y.B. Chen, S.P. Chi, Y.P. Chu, X.Z. Cui, Y.M. Dai, Y.S. Dai, L.Y. Dong, S.X. Du, Z.Z. Du, W. Dunwoodie, J. Fang, S.S. Fang, C.D. Fu, H.Y. Fu, L.P. Fu, C.S. Gao, M.L. Gao, Y.N. Gao, M.Y. Gong, W.X. Gong, S.D. Gu, Y.N. Guo, Y.Q. Guo, Z.J. Guo, S.W. Han, F.A. Harris, J. He, K.L. He, M. He, X. He, Y.K. Heng, T. Hong, H.M. Hu, T. Hu, G.S. Huang, L. Huang, X.P. Huang, J.M. Izen, X.B. Ji, C.H. Jiang, X.S. Jiang, D.P. Jin, S. Jin, Y. Jin, B.D. Jones, Z.J. Ke, D. Kong, Y.F. Lai, F. Li, G. Li, H.H. Li, J. Li, J.C. Li, K. Li, Q.J. Li, R.B. Li, R.Y. Li, W. Li, W.G. Li, X.Q. Li, X.S. Li, C.F. Liu, C.X. Liu, Fang Liu, F. Liu, H.M. Liu, J.B. Liu, J.P. Liu, R.G. Liu, Y. Liu, Z.A. Liu, Z.X. Liu, X.C. Lou, G.R. Lu, F. Lu, H.J. Lu, J.G. Lu, Z.J. Lu, X.L. Luo, E.C. Ma, F.C. Ma, J.M. Ma, R. Malchow, Z.P. Mao, X.C. Meng, X.H. Mo, J. Nie, Z.D. Nie, S.L. Olsen, D. Paluselli, H.P. Peng, N.D. Qi, C.D. Qian, J.F. Qiu, G. Rong, D.L. Shen, H. Shen, X.Y. Shen, H.Y. Sheng, F. Shi, L.W. Song, H.S. Sun, S.S. Sun, Y.Z. Sun, Z.J. Sun, S.Q. Tang, X. Tang, D. Tian, Y.R. Tian, W. Toki, G.L. Tong, G.S. Varner, J. Wang, J.Z. Wang, L. Wang, L.S. Wang, M. Wang, Meng Wang, P. Wang, P.L. Wang, W.F. Wang, Y.F. Wang, Zhe Wang, Z. Wang, Zheng Wang, Z.Y. Wang, C.L. Wei, N. Wu, X.M. Xia, X.X. Xie, G.F. Xu, Y. Xu, S.T. Xue, M.L. Yan, W.B. Yan, G.A. Yang, H.X. Yang, J. Yang, S.D. Yang, M.H. Ye, Y.X. Ye, J. Ying, C.S. Yu, G.W. Yu, C.Z. Yuan, J.M. Yuan, Y. Yuan, Q. Yue, S.L. Zang, Y. Zeng, B.X. Zhang, B.Y. Zhang, C.C. Zhang, D.H. Zhang, H.Y. Zhang, J. Zhang, J.M. Zhang, J.W. Zhang, L.S. Zhang, Q.J. Zhang, S.Q. Zhang, X.Y. Zhang, Y.J. Zhang, Yiyun Zhang, Y.Y. Zhang, Z.P. Zhang, D.X. Zhao, Jiawei Zhao, J.W. Zhao, P.P. Zhao, W.R. Zhao, Y.B. Zhao, Z.G. Zhao, J.P. Zheng, L.S. Zheng, Z.P. Zheng, X.C. Zhong, B.Q. Zhou, G.M. Zhou, L. Zhou, N.F. Zhou, K.J. Zhu, Q.M. Zhu, Yingchun Zhu, Y.C. Zhu, Y.S. Zhu, Z.A. Zhu, B.A. Zhuang, and B.S. Zou

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Branching fraction, High Energy Physics::Experiment, Flavor, Lepton
Abstract

Using a sample of 5.8X10E7 J/$\psi$ events, the Beijing Spectrometer experiment has searched for the decay J/$\psi \to e\mu$. Four candidates, consistent with the estimated background, are observed, and an upper limit on the branching fraction of J/$\psi \to e\mu$ of 1.1X10E-6 at the 90% C.L. is obtained.

Published
2003
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13. Study of the decay φ→π+π−π0 with the KLOE detector

Author

A Aloisio, F Ambrosino, A Antonelli, M Antonelli, C Bacci, F Bellini, G Bencivenni, S Bertolucci, C Bini, C Bloise, V Bocci, F Bossi, P Branchini, S.A Bulychjov, G Cabibbo, R Caloi, P Campana, G Capon, T Capussela, G Carboni, M Casarsa, V Casavola, G Cataldi, F Ceradini, F Cervelli, F Cevenini, G Chiefari, P Ciambrone, S Conetti, E De Lucia, G De Robertis, P De Simone, G De Zorzi, S Dell'Agnello, A Denig, A Di Domenico, C Di Donato, S Di Falco, B Di Micco, A Doria, M Dreucci, O Erriquez, A Farilla, G Felici, A Ferrari, M.L Ferrer, G Finocchiaro, C Forti, A Franceschi, P Franzini, C Gatti, P Gauzzi, S Giovannella, E Gorini, F Grancagnolo, E Graziani, S.W Han, M Incagli, L Ingrosso, W Kluge, C Kuo, V Kulikov, F Lacava, G Lanfranchi, J Lee-Franzini, D Leone, F Lu, M Martemianov, M Matsyuk, W Mei, L Merola, R Messi, S Miscetti, M Moulson, S Müller, F Murtas, M Napolitano, A Nedosekin, F Nguyen, M Palutan, E Pasqualucci, L Passalacqua, A Passeri, V Patera, F Perfetto, E Petrolo, G Pirozzi, L Pontecorvo, M Primavera, F Ruggieri, P Santangelo, E Santovetti, G Saracino, R.D Schamberger, B Sciascia, A Sciubba, F Scuri, I Sfiligoi, A Sibidanov, P Silano, T Spadaro, E Spiriti, G.L Tong, L Tortora, E Valente, P Valente, B Valeriani, G Venanzoni, S Veneziano, A Ventura, S Ventura, R Versaci, Y Xu, and G.W Yu

Subjects
Nuclear and High Energy Physics
Published
2003
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14. KLOE results on kaon decays and phi radiative decays

Author

P Branchini, A Aloisio, F Ambrosino, A Antonelli, M Antonelli, C Bacci, G Bencivenni, S Betolucci, C Bini, C Bloise, V Bocci, F Bossi, S.A Bulychjov, R Caloi, P Campana, G Capon, G Carboni, M Casarsa, V Casavola, G Cataldi, F Ceradini, F Cervelli, F Cevenini, G Chiefari, P Ciambrone, S Conetti, E De Lucia, G De Robertis, P De Simone, G De Zorzi, S Dell'Agnello, A Denig, A Di Domenico, C Di Donato, S Di Falco, A Doria, M Dreucci, O Erriquez, A Farilla, G Felici, A Ferrari, M.L Ferrer, G Finocchiaro, C Forti, A Franceschi, P Franzini, C Gatti, P Gauzzi, S Giovannella, E Gorini, F Grancagnolo, E Graziani, S.W Han, M Incagli, L Ingrosso, W Kluge, C Kuo, V Kulikov, F Lacava, G Lanfranchi, J Lee-Franzini, D Leone, F Lu, M Martermianov, M Matsyuk, W Mei, L Merola, R Messi, S Miscetti, M Moulson, S Müller, F Murtas, M Napolitano, A Nedosekin, F Nguyen, M Palutan, L Paoluzi, E Pasqualucci, L Passalacqua, A Passeri, V Patera, E Petrolo, L Pontecorvo, M Primavera, F Ruggieri, P Santangelo, E Santovetti, G Saracino, R.D Schamberger, B Sciascia, A Sciubba, F Scuri, I Sfiligoi, T Spadaro, E Spiriti, G.L Tong, L Tortora, E Valente, P Valente, B Valeriani, G Venanzoni, S Veneziano, A Ventura, G Xu, and G.W Yu

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Branching fraction, law, Radiative transfer, Center of mass, Collider, Atomic and Molecular Physics, and Optics, law.invention
Abstract

The KLOE experiment has been collecting data since April 1999 at the DAΦNE e+-e− collider at a center of mass energy equal to the o-meson mass. A total amount of 5 × 107 o decays have been analyzed. Results concerning the measurement of the semileptonic branching ratio of the KS, the measurement of the ratio BR(KS → π+π−)BR(KS → π0π0) and the study of the radiative decays of the o involving η, η′, ƒ0(980) and a0(980) are presented.

Published
2003
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15. Study of the decay φ→π0π0γ with the KLOE detector

Author

W. Kluge, Juliet Lee-Franzini, G. De Robertis, S. Giovannella, E. De Lucia, E. Santovetti, S. Conetti, Giuseppe Pirozzi, A. Franceschi, Paolo Santangelo, Pierluigi Campana, M. Incagli, Leonardo Merola, Fabrizio Scuri, F. Ruggieri, G. Capon, F. Murtas, M. Moulson, S. Müller, S. Bertolucci, G. De Zorzi, Luca Tortora, G. Lanfranchi, A. Nedosekin, F. Ambrosino, C. Forti, L. Passalacqua, G.L. Tong, C. Kuo, G. Finocchiaro, O. Erriquez, M. Napolitano, S. Dell'Agnello, A. Ferrari, F. Perfetto, B. Valeriani, F. Cervelli, R. D. Schamberger, M. A. Matsyuk, A. Passeri, A. Denig, S.W. Han, P. De Simone, R. Messi, Francesco Lacava, Barbara Sciascia, Andrea Ventura, G. Cataldi, V. Bocci, F. Lu, Margherita Primavera, A. Di Domenico, P. Gauzzi, L. Ingrosso, E. Graziani, Enrico Pasqualucci, S.A. Bulychjov, G.W. Yu, G. Saracino, Massimo Antonelli, F. Cevenini, Filippo Ceradini, G. Cabibbo, S. Di Falco, Massimo Casarsa, E. Valente, R. Caloi, P. Valente, Paolo Ciambrone, T. Capussela, A.L. Sibidanov, G. Venanzoni, V. Casavola, G. Carboni, M. L. Ferrer, D. Leone, Y. Xu, P. Silano, A. Antonelli, F. Grancagnolo, Alberto Aloisio, W. Mei, F Bellini, T. Spadaro, Vincenzo Patera, V. V. Kulikov, A. Sciubba, F. Nguyen, M. Palutan, S. Miscetti, E. Spiriti, P. Branchini, M. Dreucci, C. Gatti, C. Bacci, Cesare Bini, C. Bloise, Edoardo Gorini, F. Bossi, S. Ventura, P. Franzini, Stefano Veneziano, G. Felici, G. Bencivenni, G. Chiefari, C. Di Donato, Alessandra Doria, Ludovico Pontecorvo, M. Martemianov, B. Di Micco, Emilio Petrolo, R. Versaci, Igor Sfiligoi, and Addolorata Farilla

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Meson, Branching fraction, Detector, Mass spectrum
Abstract

We have measured the branching ratio BR( φ → π 0 π 0 γ ) with the KLOE detector using a sample of ∼5×10 7 φ decays. φ mesons are produced at DA Φ NE, the Frascati φ -factory. We find BR( φ → π 0 π 0 γ )=(1.09±0.03 stat ±0.05 syst )×10 −4 . We fit the two-pion mass spectrum to models to disentangle contributions from various sources.

Published
2002
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16. Study of production from

Author

J.Z. Bai, Y. Ban, J.G. Bian, J.F. Chang, A.D. Chen, H.F. Chen, H.S. Chen, J.C. Chen, X.D. Chen, Y.B. Chen, B.S. Cheng, S.P. Chi, Y.P. Chu, X.Z. Cui, Y.S. Dai, L.Y. Dong, Z.Z. Du, H.Y. Fu, L.P. Fu, C.S. Gao, S.D. Gu, Y.N. Guo, Z.J. Guo, S.W. Han, Y. Han, J. He, J.T. He, K.L. He, M. He, X. He, T. Hong, Y.K. Heng, G.Y. Hu, H.M. Hu, Q.H. Hu, T. Hu, G.S. Huang, X.P. Huang, Y.Z. Huang, X.B. Ji, C.H. Jiang, Y. Jin, Z.J. Ke, Y.F. Lai, D. Li, H.B. Li, H.H. Li, J. Li, J.C. Li, P.Q. Li, Q.J. Li, R.Y. Li, W. Li, W.G. Li, X.N. Li, X.Q. Li, B. Liu, F. Liu, Feng Liu, H.M. Liu, J. Liu, J.P. Liu, T.R. Liu, R.G. Liu, Y. Liu, Z.X. Liu, G.R. Lu, F. Lu, J.G. Lu, Z.J. Lu, X.L. Luo, E.C. Ma, F.C. Ma, J.M. Ma, Z.P. Mao, X.C. Meng, X.H. Mo, J. Nie, Z.D. Nie, N.D. Qi, X.R. Qi, C.D. Qian, J.F. Qiu, Y.K. Que, G. Rong, Y.Y. Shao, B.W. Shen, D.L. Shen, H. Shen, X.Y. Shen, H.Y. Sheng, F. Shi, H.Z. Shi, X.F. Song, H.S. Sun, L.F. Sun, Y.Z. Sun, S.Q. Tang, X. Tang, G.L. Tong, J. Wang, J.Z. Wang, L. Wang, L.S. Wang, M. Wang, Meng Wang, P. Wang, P.L. Wang, S.M. Wang, W.F. Wang, Y.Y. Wang, Z.Y. Wang, C.L. Wei, N. Wu, D.M. Xi, X.M. Xia, X.X. Xie, G.F. Xu, Y. Xu, S.T. Xue, M.L. Yan, W.B. Yan, W.G. Yan, C.M. Yang, C.Y. Yang, G.A. Yang, H.X. Yang, X.F. Yang, M.H. Ye, S.W. Ye, Y.X. Ye, C.S. Yu, C.X. Yu, G.W. Yu, Y. Yuan, Y. Zeng, B.Y. Zhang, C.C. Zhang, D.H. Zhang, H.L. Zhang, H.Y. Zhang, J. Zhang, J.W. Zhang, L. Zhang, L.S. Zhang, P. Zhang, Q.J. Zhang, S.Q. Zhang, X.Y. Zhang, Y.Y. Zhang, Z.P. Zhang, D.X. Zhao, H.W. Zhao, Jiawei Zhao, J.W. Zhao, P.P. Zhao, W.R. Zhao, Y.B. Zhao, Z.G. Zhao, J.P. Zheng, L.S. Zheng, Z.P. Zheng, X.C. Zhong, B.Q. Zhou, G.M. Zhou, L. Zhou, K.J. Zhu, Q.M. Zhu, Y.C. Zhu, Y.S. Zhu, Z.A. Zhu, B.A. Zhuang, B.S. Zou, H.C. Chiang, G.X. Peng, J.X. Wang, and J.J. Zhu

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, Partial wave analysis, Resonance, High Energy Physics::Experiment, Production (computer science), Atomic physics, Nuclear Experiment
Abstract

Data are presented on the reaction J/psi--> p pbar eta using 7.8 million J/psi triggers collected by the BEjing Spectrometer (BES). A partial wave analysis is performed. A clear enhancement near the p eta(pbar eta) threshold is observed. It is fitted with a JP=1/2- resonance with mass $M= 1530\pm 10$ MeV and width $\Gamma = 95\pm 25$ MeV. In addition, there is a peak around 1650 MeV with JP=1/2- preferred also, fitted with $M =1647\pm 20$ MeV and $\Gamma = 145^{+80}_{-45}$ MeV. These two N* resonances are believed to be the two well established states, S11(1535) and S11(1650), respectively. It is the first partial wave study of the production of these resonances from J/psi decays.

Published
2001
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17. Partial wave analysis of J/ψ→γ(K±KS0π∓)

Author

J.Z. Bai, Y. Ban, J.G. Bian, A.D. Chen, G.P. Chen, H.F. Chen, H.S. Chen, J.C. Chen, X.D. Chen, Y. Chen, Y.B. Chen, B.S. Cheng, X.Z. Cui, H.L. Ding, L.Y. Dong, Z.Z. Du, C.S. Gao, M.L. Gao, S.Q. Gao, J.H. Gu, S.D. Gu, W.X. Gu, Y.N. Guo, Z.J. Guo, S.W. Han, Y. Han, J. He, J.T. He, K.L. He, M. He, Y.K. Heng, G.Y. Hu, H.M. Hu, J.L. Hu, Q.H. Hu, T. Hu, G.S. Huang, X.P. Huang, Y.Z. Huang, C.H. Jiang, Y. Jin, X. Ju, Z.J. Ke, Y.F. Lai, P.F. Lang, C.G. Li, D. Li, H.B. Li, J. Li, J.C. Li, P.Q. Li, W. Li, W.G. Li, X.H. Li, X.N. Li, X.Q. Li, Z.C. Li, B. Liu, F. Liu, Feng Liu, H.M. Liu, J. Liu, J.P. Liu, R.G. Liu, Y. Liu, Z.X. Liu, G.R. Lu, F. Lu, J.G. Lu, X.L. Luo, E.C. Ma, J.M. Ma, H.S. Mao, Z.P. Mao, X.C. Meng, X.H. Mo, J. Nie, N.D. Qi, X.R. Qi, C.D. Qian, J.F. Qiu, Y.H. Qu, Y.K. Que, G. Rong, Y.Y. Shao, B.W. Shen, D.L. Shen, H. Shen, H.Y. Shen, X.Y. Shen, F. Shi, H.Z. Shi, X.F. Song, H.S. Sun, L.F. Sun, Y.Z. Sun, S.Q. Tang, G.L. Tong, F. Wang, L. Wang, L.S. Wang, L.Z. Wang, P. Wang, P.L. Wang, S.M. Wang, Y.Y. Wang, Z.Y. Wang, C.L. Wei, N. Wu, Y.G. Wu, D.M. Xi, X.M. Xia, Y. Xie, Y.H. Xie, G.F. Xu, S.T. Xue, J. Yan, W.G. Yan, C.M. Yang, C.Y. Yang, H.X. Yang, X.F. Yang, M.H. Ye, S.W. Ye, Y.X. Ye, C.S. Yu, C.X. Yu, G.W. Yu, Y.H. Yu, Z.Q. Yu, C.Z. Yuan, Y. Yuan, B.Y. Zhang, C. Zhang, C.C. Zhang, D.H. Zhang, Dehong Zhang, H.L. Zhang, J. Zhang, J.W. Zhang, L. Zhang, Lei Zhang, L.S. Zhang, P. Zhang, Q.J. Zhang, S.Q. Zhang, X.Y. Zhang, Y.Y. Zhang, D.X. Zhao, H.W. Zhao, Jiawei Zhao, J.W. Zhao, M. Zhao, W.R. Zhao, Z.G. Zhao, J.P. Zheng, L.S. Zheng, Z.P. Zheng, B.Q. Zhou, L. Zhou, K.J. Zhu, Q.M. Zhu, Y.C. Zhu, Y.S. Zhu, Z.A. Zhu, B.A. Zhuang, D.V. Bugg, and B.S. Zou

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Amplitude, Partial wave analysis, Pi, High Energy Physics::Experiment, Bar (unit)
Abstract

BES data on $J/\psi \to \gamma (K^{\pm} K_S^0 \pi^{\mp})$ are presented. There is a strong peak due to $\eta(1440)/\iota$, which is fitted with a Breit-Wigner amplitude with $s$-dependent widths for decays to $K^*K$, $\kappa K$, $\eta \pi\pi$ and $\rho\rho$; $\kappa$ refers to the $K\pi$ S-wave. At a $K\bar{K}\pi$ mass of $\sim 2040$ MeV, there is a second peak with width $\sim 400$ MeV; $J^P = 0^-$ is preferred over $1^+$ and $2^-$ respectively by 5.2 and 6.8 standard deviations. It is a possible candidate for a $0^-$ $s\bar sg$ hybrid partner of $\pi(1800)$.

Published
2000
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18. Partial wave analysis of J/ψ→γ(K+K−π+π−)

Author

J.Z. Bai, Y. Ban, J.G. Bian, A.D. Chen, G.P. Chen, H.F. Chen, H.S. Chen, J.C. Chen, X.D. Chen, Y. Chen, Y.B. Chen, B.S. Cheng, X.Z. Cui, H.L. Ding, L.Y. Dong, Z.Z. Du, C.S. Gao, M.L. Gao, S.Q. Gao, J.H. Gu, S.D. Gu, W.X. Gu, Y.N. Guo, Z.J. Guo, S.W. Han, Y. Han, J. He, J.T. He, K.L. He, M. He, Y.K. Heng, G.Y. Hu, H.M. Hu, J.L. Hu, Q.H. Hu, T. Hu, G.S. Huang, X.P. Huang, Y.Z. Huang, C.H. Jiang, Y. Jin, X. Ju, Z.J. Ke, Y.F. Lai, P.F. Lang, C.G. Li, D. Li, H.B. Li, J. Li, J.C. Li, P.Q. Li, W. Li, W.G. Li, X.H. Li, X.N. Li, X.Q. Li, Z.C. Li, B. Liu, F. Liu, Feng Liu, H.M. Liu, J. Liu, J.P. Liu, R.G. Liu, Y. Liu, Z.X. Liu, G.R. Lu, F. Lu, J.G. Lu, X.L. Luo, E.C. Ma, J.M. Ma, H.S. Mao, Z.P. Mao, X.C. Meng, X.H. Mo, J. Nie, N.D. Qi, X.R. Qi, C.D. Qian, J.F. Qiu, Y.H. Qu, Y.K. Que, G. Rong, Y.Y. Shao, B.W. Shen, D.L. Shen, H. Shen, H.Y. Shen, X.Y. Shen, F. Shi, H.Z. Shi, X.F. Song, H.S. Sun, L.F. Sun, Y.Z. Sun, S.Q. Tang, G.L. Tong, F. Wang, L. Wang, L.S. Wang, L.Z. Wang, P. Wang, P.L. Wang, S.M. Wang, Y.Y. Wang, Z.Y. Wang, C.L. Wei, N. Wu, Y.G. Wu, D.M. Xi, X.M. Xia, Y. Xie, Y.H. Xie, G.F. Xu, S.T. Xue, J. Yan, W.G. Yan, C.M. Yang, C.Y. Yang, H.X. Yang, X.F. Yang, M.H. Ye, S.W. Ye, Y.X. Ye, C.S. Yu, C.X. Yu, G.W. Yu, Y.H. Yu, Z.Q. Yu, C.Z. Yuan, Y. Yuan, B.Y. Zhang, C. Zhang, C.C. Zhang, D.H. Zhang, Dehong Zhang, H.L. Zhang, J. Zhang, J.W. Zhang, L. Zhang, Lei Zhang, L.S. Zhang, P. Zhang, Q.J. Zhang, S.Q. Zhang, X.Y. Zhang, Y.Y. Zhang, D.X. Zhao, H.W. Zhao, Jiawei Zhao, J.W. Zhao, M. Zhao, W.R. Zhao, Z.G. Zhao, J.P. Zheng, L.S. Zheng, Z.P. Zheng, B.Q. Zhou, L. Zhou, K.J. Zhu, Q.M. Zhu, Y.C. Zhu, Y.S. Zhu, Z.A. Zhu, B.A. Zhuang, D.V. Bugg, and B.S. Zou

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Near threshold, Particle physics, Phase space, Partial wave analysis, Pi, Resonance, High Energy Physics::Experiment, Nuclear Experiment, Bar (unit)
Abstract

BES data on $J/\psi \to \gamma (K^+K^-\pi^+\pi^-)$ are presented. The $K^*\bar K^*$ contribution peaks strongly near threshold. It is fitted with a broad $0^{-+}$ resonance with mass $M = 1800 \pm 100$ MeV, width $\Gamma = 500 \pm 200$ MeV. A broad $2^{++}$ resonance peaking at 2020 MeV is also required with width $\sim 500$ MeV. There is further evidence for a $2^{-+}$ component peaking at 2.55 GeV. The non-$K^*\bar K^*$ contribution is close to phase space; it peaks at 2.6 GeV and is very different from $K^{*}\bar{K^{*}}$.

Published
2000
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19. Partial wave analysis of J/ψ→γ(π+π−π+π−)

Author

J.Z. Bai, Y. Ban, J.G. Bian, A.D. Chen, G.P. Chen, H.F. Chen, H.S. Chen, J.C. Chen, X.D. Chen, Y. Chen, Y.B. Chen, B.S. Cheng, X.Z. Cui, H.L. Ding, L.Y. Dong, Z.Z. Du, C.S. Gao, M.L. Gao, S.Q. Gao, J.H. Gu, S.D. Gu, W.X. Gu, Y.N. Guo, Z.J. Guo, S.W. Han, Y. Han, J. He, J.T. He, K.L. He, M. He, Y.K. Heng, G.Y. Hu, H.M. Hu, J.L. Hu, Q.H. Hu, T. Hu, G.S. Huang, X.P. Huang, Y.Z. Huang, C.H. Jiang, Y. Jin, X. Ju, Z.J. Ke, Y.F. Lai, P.F. Lang, C.G. Li, D. Li, H.B. Li, J. Li, J.C. Li, P.Q. Li, W. Li, W.G. Li, X.H. Li, X.N. Li, X.Q. Li, Z.C. Li, B. Liu, F. Liu, Feng Liu, H.M. Liu, J. Liu, J.P. Liu, R.G. Liu, Y. Liu, Z.X. Liu, G.R. Lu, F. Lu, J.G. Lu, X.L. Luo, E.C. Ma, J.M. Ma, H.S. Mao, Z.P. Mao, X.C. Meng, X.H. Mo, J. Nie, N.D. Qi, X.R. Qi, C.D. Qian, J.F. Qiu, Y.H. Qu, Y.K. Que, G. Rong, Y.Y. Shao, B.W. Shen, D.L. Shen, H. Shen, H.Y. Shen, X.Y. Shen, F. Shi, H.Z. Shi, X.F. Song, H.S. Sun, L.F. Sun, Y.Z. Sun, S.Q. Tang, G.L. Tong, F. Wang, L. Wang, L.S. Wang, L.Z. Wang, P. Wang, P.L. Wang, S.M. Wang, Y.Y. Wang, Z.Y. Wang, C.L. Wei, N. Wu, Y.G. Wu, D.M. Xi, X.M. Xia, Y. Xie, Y.H. Xie, G.F. Xu, S.T. Xue, J. Yan, W.G. Yan, C.M. Yang, C.Y. Yang, H.X. Yang, X.F. Yang, M.H. Ye, S.W. Ye, Y.X. Ye, C.S. Yu, C.X. Yu, G.W. Yu, Y.H. Yu, Z.Q. Yu, C.Z. Yuan, Y. Yuan, B.Y. Zhang, C. Zhang, C.C. Zhang, D.H. Zhang, Dehong Zhang, H.L. Zhang, J. Zhang, J.W. Zhang, L. Zhang, Lei Zhang, L.S. Zhang, P. Zhang, Q.J. Zhang, S.Q. Zhang, X.Y. Zhang, Y.Y. Zhang, D.X. Zhao, H.W. Zhao, Jiawei Zhao, J.W. Zhao, M. Zhao, W.R. Zhao, Z.G. Zhao, J.P. Zheng, L.S. Zheng, Z.P. Zheng, B.Q. Zhou, L. Zhou, K.J. Zhu, Q.M. Zhu, Y.C. Zhu, Y.S. Zhu, Z.A. Zhu, B.A. Zhuang, D.V. Bugg, B.S. Zou, and I. Scott

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Electron–positron annihilation, Partial wave analysis, Pi, Atomic physics
Published
2000
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20. STUDY OF $ K_S^0 $, K± DECAYS AT ϕ RESONANCE WITH THE KLOE DETECTOR

Author

E. Spiriti, G. De Robertis, G. Cataldi, L. Ingrosso, L. Paoluzi, F. Ruggieri, G. Capon, L. Passalacqua, Alessandra Menicucci, C. Kuo, A. G. Denig, P. Campana, A. Franceschi, Paolo Santangelo, F. Bossi, P. F. Zema, G. Barbiellini, F. Murtas, Filippo Ceradini, E. De Lucia, P. De Simone, A. Ventura, P. Franzini, G. Chiefari, Leonardo Merola, O. Erriquez, P. Gauzzi, Emilio Petrolo, S. Müller, Barbara Sciascia, Enrico Pasqualucci, R. Messi, Paolo Ciambrone, Vincenzo Patera, F. Ambrosino, S. Miscetti, Y. Zhou, G. Xu, P. Silano, F. Grancagnolo, E. Santovetti, G. Carboni, A. Sciubba, Margherita Primavera, V. V. Kulikov, L. Tortora, A. Farilla, Igor Sfiligoi, V. Bocci, G. Finocchiaro, G. De Zorzi, C. Bacci, D. Picca, Alberto Aloisio, B. Valeriani, F. Cervelli, G. Cabibbo, F. Lu, W. Mei, G. Lanfranci, D. Leone, Ludovico Pontecorvo, Claudio Gatti, C. Bloise, Stefano Veneziano, A. Di Domenico, Cesare Bini, C. Forti, F. Bellini, Massimo Casarsa, G.W. Yu, P. Valente, A. Ferrari, G. Venanzoni, G.L. Tong, M. Martemianov, A. Giannasi, S. Conetti, G. Bencivenni, G. Saracino, Edoardo Gorini, M. L. Ferrer, M. Napolitano, C. Di Donato, Juliet Lee-Franzini, A. Nedosekin, V. Casavola, S.W. Han, M. A. Matsyuk, Andrea Doria, W. Kluge, S. Di Falco, Giuseppe Pirozzi, Yican Wu, A. Antonelli, S.A. Bulychjov, M. Moulson, J. Shan, S. Giovannella, S. Dell'Agnello, S. Bertolucci, M. Incagli, Fabrizio Scuri, T. Spadaro, Massimo Antonelli, E. Graziani, Francesco Lacava, R. Caloi, P. Branchini, M. Dreucci, F. Cevenini, E. Valente, F. Nguyen, M. Palutan, G. Felici, R. D. Schamberger, and A. Passeri

Subjects
Physics, Nuclear physics, Particle physics, Meson, Detector, Resonance (particle physics)
Published
2003
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21. RECENT RESULTS FROM THE KLOE EXPERIMENT AT THE DAΦNE ϕ-FACTORY

Author

G. Cataldi, L. Ingrosso, E. Petrola, D. Leone, E. Valente, P. Franzini, W. Kluge, S. Di Falco, L. Paoluzi, P. Branching, R. Caloi, A. Nedosekin, Juliet Lee-Franzini, C. Bacci, G. Xu, E. Spiriti, A. G. Denig, G.W. Yu, Edoardo Gorini, P. De Simone, C. Di Donato, S. Dell'Agnello, Massimo Casarsa, S. Giovannella, V. Casavola, A. Ventura, Margherita Primavera, G. Saracino, P. Valente, G. Chiefari, F. Nguyen, Massimo Antonelli, F. Cevenini, Leonardo Merola, A. Ferrari, E. Santovetti, L. Passalacqua, R. Messi, S. Mueller, A. Antonelli, Enrico Pasqualucci, M. Dreucci, M. Palutan, C. Kuo, F. Ambrosino, V. Bocci, O. Erriquez, G. De Zorzi, G. Venanzoni, S. Conetti, S. Bertolucci, F. Bossi, F. Grancagnolo, M. L. Ferrer, Francesco Lacava, A. Franceschi, Paolo Santangelo, M. Incagli, T. Spadaro, F. Murtas, Ludovico Pontecorvo, Fabrizio Scuri, B. Valeriani, F. Cervelli, A. Di Domenico, S.A. Bulychjov, Cesare Bini, A. Passeri, M. Martemianov, F. Lu, G. Felici, R. D. Schamberger, L. Tortora, E. Graziani, S. Miscetti, Vincenzo Patera, A. Sciubba, P. Gauzzi, P. Campana, A. Farilla, Igor Sfiligoi, Alberto Aloisio, W. Mei, Stefano Veneziano, G. Bencivenni, Claudio Gatti, C. Bloise, G.L. Tong, Barbara Sciascia, G. Cabibbo, C. Forti, M. Napolitano, Filippo Ceradini, Paolo Ciambrone, M. A. Matsyuk, Andrea Doria, G. De Robertis, G. Finocchiaro, G. Lanfranchi, E. De Lucia, S.W. Han, V. V. Kulikov, M. Moulson, F. Ruggieri, and G. Capon

Subjects
Physics, Particle physics, Meson, Factory (object-oriented programming)
Published
2003
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22. Measuring the hadronic cross section via radiative return

Author

A. Aloisio, F. Ambrosino, A. Antonelli, M. Antonelli, C. Bacci, G. Bencivenni, S. Bertolucci, C. Bini, C. Bloise, V. Bocci, F. Bossi, P. Branchini, S.A. Bulychjov, R. Caloi, P. Campana, G. Capon, G. Carboni, M. Casarsa, V. Casavola, G. Cataldi, F. Ceradini, F. Cervelli, F. Cevenini, G. Chiefari, P. Ciambrone, S. Conetti, E. De Lucia, G. De Robertis, P. De Simone, G. De Zorzi, S. Dell'Agnello, A. Denig, A. Di Domenico, C. Di Donato, S. Di Falco, A. Doria, M. Dreucci, O. Erriquez, A. Farilla, G. Felici, A. Ferrari, M.L. Ferrer, G. Finocchiaro, C. Forti, A. Franceschi, P. Franzini, C. Gatti, P. Gauzzi, S. Giovannella, E. Gorini, F. Grancagnolo, E. Graziani, S.W. Han, M. Incagli, L. Ingrosso, W. Kluge, C. Kuo, V. Kulikov, F. Lacava, G. Lanfranchi, J. Lee-Franzini, D. Leone, F. Lu, M. Martemianov, M. Matsyuk, W. Mei, L. Merola, R. Messi, S. Miscetti, M. Moulson, S. Müller, F. Murtas, M. Napolitano, A. Nedosekin, F. Nguyen, M. Palutan, L. Paoluzi, E. Pasqualucci, L. Passalacqua, A. Passeri, V. Patera, E. Petrolo, L. Pontecorvo, M. Primavera, F. Ruggieri, P. Santangelo, E. Santovetti, G. Saracino, R.D. Schamberger, B. Sciascia, A. Sciubba, F. Scuri, I. Sfiligoi, T. Spadaro, E. Spiriti, G.L. Tong, L. Tortora, E. Valente, P. Valente, B. Valeriani, G. Venanzoni, S. Veneziano, A. Ventura, G. Xu, and G.W. Yu

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Hadron, Form factor (quantum field theory), FOS: Physical sciences, Function (mathematics), Measure (mathematics), Atomic and Molecular Physics, and Optics, High Energy Physics - Experiment, Cross section (physics), High Energy Physics - Experiment (hep-ex), Pion, Radiative transfer, Physics::Accelerator Physics, High Energy Physics::Experiment, Energy (signal processing)
Abstract

Recently it has been demonstrated that particle factories, such as DAPHNE and PEP-II, operating at fixed center-of-mass energies, are able to measure hadronic cross sections as a function of the hadronic system energy using the raditive return. This paper is an experimental overview of the progress in this aera. Preliminary results from KLOE for the process e+e- -> \rho \gamma -> \pi+\pi-\gamma and a fit to the pion form factor are presented. Some first results from the BABAR collaboration are also shown., Comment: Invited talk presented at RADCOR/Loops and Legs 2002, Kloster Banz/Germany, September 8-13 2002, 6 pages, 2 Figures; v1: references added, typos corrected

Published
2002

23. Detection of φ → a0(980)γ, f0(980)γ and φ → ηγ, φ → η′γ with the KLOE detector at DAΦNE

Author

G.W. Yu, S.A. Bulychjov, J. Shan, P. Silano, G. Venanzoni, F. Nguyen, Margherita Primavera, F. Cevenini, V. Casavola, C. Bacci, A. Antonelli, F. Ruggieri, G. Capon, M. L. Ferrer, Leonardo Merola, Francesco Lacava, F. Grancagnolo, Enrico Pasqualucci, M. Palutan, G. Xu, A. Nedosekin, F. Bossi, L. Paoluzi, G. De Zorzi, F. Ambrosino, P. F. Zema, Edoardo Gorini, E. Spiriti, P. Campana, F. Lu, F. Bellini, R. Caloi, R. Messi, E. Valente, G. Carboni, A. Di Domenico, B. Valeriani, F. Cervelli, A. Passeri, D. Leone, G. Felici, L. Tortora, R. D. Schamberger, Massimo Casarsa, A. Franceschi, Paolo Santangelo, L. Passalacqua, V. Bocci, G. Lanfranchi, Alessandra Menicucci, O. Erriquez, S. Miscetti, D. Picca, P. Valente, P. Branchini, M. Dreucci, A. Ferrari, F. Murtas, C. Kuo, S. Bertolucci, P. Franzini, Cesare Bini, Alberto Aloisio, W. Mei, S. Müller, G. Cataldi, Ludovico Pontecorvo, W. Kluge, Y. Zhou, T. Spadaro, Yican Wu, L. Ingrosso, Vincenzo Patera, V. V. Kulikov, A. Sciubba, G. Cabibbo, M. Martemianov, S. Dell'Agnello, A. Giannasi, S. Di Falco, Giuseppe Pirozzi, Barbara Sciascia, M. Moulson, Claudio Gatti, C. Bloise, G. Saracino, G.L. Tong, A. G. Denig, G. Barbiellini, C. Forti, A. Ventura, G. Chiefari, C. Di Donato, M. Napolitano, M. A. Matsyuk, Andrea Doria, G. Finocchiaro, Filippo Ceradini, Paolo Ciambrone, S.W. Han, P. De Simone, E. De Lucia, E. Santovetti, S. Conetti, M. Incagli, P. Gauzzi, Emilio Petrolo, Fabrizio Scuri, A. Farilla, Igor Sfiligoi, Juliet Lee-Franzini, G. De Robertis, Stefano Veneziano, G. Bencivenni, S. Giovannella, Massimo Antonelli, and E. Graziani

Subjects
Nuclear physics, Physics, Detector
Published
2002
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24. A Measurement of Psi(2S) Resonance Parameters

Author

J.Z Bai, Y Ban, J.G Bian, I Blum, X Cai, J.F Chang, H.F Chen, H.S Chen, J Chen, Jie Chen, J.C Chen, Y.B Chen, S.P Chi, Y.P Chu, X.Z Cui, Y.S Dai, L.Y Dong, Z.Z Du, W Dunwoodie, J Fang, S.S Fang, H.Y Fu, L.P Fu, C.S Gao, Y.N Gao, M.Y Gong, P Gratton, S.D Gu, Y.N Guo, Y.Q Guo, Z.J Guo, S.W Han, F.A Harris, J He, K.L He, M He, X He, Y.K Heng, T Hong, H.M Hu, T Hu, G.S Huang, X.P Huang, J.M Izen, X.B Ji, C.H Jiang, X.S Jiang, D.P Jin, S Jin, Y Jin, B.D Jones, Z.J Ke, D Kong, Y.F Lai, G Li, H.H Li, J Li, J.C Li, Q.J Li, R.Y Li, W Li, W.G Li, X.Q Li, C.F Liu, F Liu, H.M Liu, J.P Liu, R.G Liu, T.R Liu, Y Liu, Z.A Liu, Z.X Liu, X.C Lou, B Lowery, G.R Lu, F Lu, H.J Lu, J.G Lu, Z.J Lu, X.L Luo, E.C Ma, F.C Ma, J.M Ma, R Malchow, Z.P Mao, X.C Meng, X.H Mo, J Nie, Z.D Nie, S.L Olsen, D Paluselli, L.J Pan, J Panetta, H.P Peng, F Porter, N.D Qi, C.D Qian, J.F Qiu, G Rong, D.L Shen, H Shen, X.Y Shen, H.Y Sheng, F Shi, J Standifird, H.S Sun, S.S Sun, Y.Z Sun, X Tang, D Tian, W Toki, G.L Tong, G.S Varner, J Wang, J.Z Wang, L Wang, L.S Wang, M Wang, Meng Wang, P Wang, P.L Wang, W.F Wang, Y.F Wang, Y.Y Wang, Z Wang, Zheng Wang, Z.Y Wang, M Weaver, C.L Wei, N Wu, X.M Xia, X.X Xie, G.F Xu, Y Xu, S.T Xue, M.L Yan, W.B Yan, C.Y Yang, G.A Yang, H.X Yang, M.H Ye, S.W Ye, Y.X Ye, J Ying, C.S Yu, G.W Yu, C.Z Yuan, J.M Yuan, Y Yuan, Q Yue, Y Zeng, B.X Zhang, B.Y Zhang, C.C Zhang, D.H Zhang, H.Y Zhang, J Zhang, J.W Zhang, L Zhang, L.S Zhang, Q.J Zhang, S.Q Zhang, X.Y Zhang, Y.Y Zhang, Yiyun Zhang, Z.P Zhang, D.X Zhao, Jiawei Zhao, J.W Zhao, P.P Zhao, W.R Zhao, Y.B Zhao, Z.G Zhao, J.P Zheng, L.S Zheng, Z.P Zheng, X.C Zhong, B.Q Zhou, G.M Zhou, L Zhou, K.J Zhu, Q.M Zhu, Y.C Zhu, Y.S Zhu, Z.A Zhu, B.A Zhuang, and B.S Zou

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Hadron, FOS: Physical sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Phenomenology, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Pi, High Energy Physics::Experiment
Abstract

Cross sections for e+e- to hadons, pi+pi- J/Psi, and mu+mu- have been measured in the vicinity of the Psi(2S) resonance using the BESII detector operated at the BEPC. The Psi(2S) total width; partial widths to hadrons, pi+pi- J/Psi, muons; and corresponding branching fractions have been determined to be Gamma(total)= (264+-27) keV; Gamma(hadron)= (258+-26) keV, Gamma(mu)= (2.44+-0.21) keV, and Gamma(pi+pi- J/Psi)= (85+-8.7) keV; and Br(hadron)= (97.79+-0.15)%, Br(pi+pi- J/Psi)= (32+-1.4)%, Br(mu)= (0.93+-0.08)%, respectively., Comment: 8 pages, 6 figures

Published
2002
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25. Erratum to: 'Study of the decay ϕ→π+π−π0 with the KLOE detector' [Phys. Lett. B 561 (2003) 55]

Author

Leonardo Merola, S. Ventura, P. Franzini, G. De Zorzi, Massimo Casarsa, F. Ambrosino, P. Valente, Filippo Ceradini, S. Bertolucci, A. G. Denig, G. Finocchiaro, O. Erriquez, A. Ferrari, G. Lanfranchi, F. Perfetto, B. Valeriani, G. Venanzoni, F. Cervelli, T. Spadaro, C. Bloise, Enrico Pasqualucci, Paolo Ciambrone, M. L. Ferrer, A. Nedosekin, G. Chiefari, E. Santovetti, L. Passalacqua, G.L. Tong, V. V. Kulikov, Vincenzo Patera, F Bellini, E. De Lucia, C. Di Donato, F. Nguyen, P. Branchini, M. Dreucci, C. Bacci, Addolorata Farilla, Cesare Bini, A. Sciubba, F. Grancagnolo, G.W. Yu, Luca Tortora, C. Forti, S.W. Han, P. De Simone, M. Palutan, Alessandra Doria, S. Dell'Agnello, C. Kuo, S. Conetti, D. Leone, Juliet Lee-Franzini, G. De Robertis, M. Napolitano, P. Silano, B. Di Micco, Edoardo Gorini, G. Felici, R. D. Schamberger, A. Franceschi, F. Lu, M. A. Matsyuk, P. Gauzzi, Emilio Petrolo, Giuseppe Pirozzi, F. Bossi, T. Capussela, Paolo Santangelo, Pierluigi Campana, F. Murtas, G. Saracino, R. Messi, Massimo Antonelli, M. Moulson, S. Giovannella, Francesco Lacava, G. Carboni, V. Casavola, Ludovico Pontecorvo, A.L. Sibidanov, R. Versaci, Alberto Aloisio, Igor Sfiligoi, Y. Xu, W. Kluge, Barbara Sciascia, Andrea Ventura, C. Gatti, R. Caloi, Margherita Primavera, V. Bocci, W. Mei, A. Antonelli, E. Graziani, Stefano Veneziano, M. Incagli, M. Martemianov, G. Bencivenni, Fabrizio Scuri, F. Ruggieri, G. Capon, A. Passeri, S.A. Bulychjov, S. Miscetti, E. Spiriti, F. Cevenini, E. Valente, G. Cataldi, L. Ingrosso, G. Cabibbo, S. Di Falco, S. Müller, and A. Di Domenico

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Amplitude, Density distribution, Electron–positron annihilation, Detector, Pi, Dalitz plot, High Energy Physics::Experiment, Charge (physics), Nuclear Experiment, Omega
Abstract

We present a study of the reaction e+e- --> pi+pi-pi0 at the phi peak W=M(phi)=1019.4 MeV observed with the KLOE detector at Dafne. The reaction is dominated by phi production and decay, e+e- --> phi --> pi+pi-pi0. From a fit to the Dalitz plot density distribution we obtain the rho-meson parameters for its three charge states. We also find the relative amplitudes for phi --> rhopi and phi -> pi+pi-pi0 and the cross-section for e+e- --> omega pi0 with omega --> pi+pi-.

Published
2005
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27. Measurements of J/ψ→pp̄

Author

J.Z. Bai, Y. Ban, J.G. Bian, X. Cai, J.F. Chang, H.F. Chen, H.S. Chen, H.X. Chen, J. Chen, J.C. Chen, Jun Chen, M.L. Chen, Y.B. Chen, S.P. Chi, Y.P. Chu, X.Z. Cui, H.L. Dai, Y.S. Dai, Z.Y. Deng, L.Y. Dong, S.X. Du, Z.Z. Du, J. Fang, S.S. Fang, C.D. Fu, H.Y. Fu, L.P. Fu, C.S. Gao, M.L. Gao, Y.N. Gao, M.Y. Gong, W.X. Gong, S.D. Gu, Y.N. Guo, Y.Q. Guo, Z.J. Guo, S.W. Han, F.A. Harris, J. He, K.L. He, M. He, X. He, Y.K. Heng, H.M. Hu, T. Hu, G.S. Huang, L. Huang, X.P. Huang, X.B. Ji, Q.Y. Jia, C.H. Jiang, X.S. Jiang, D.P. Jin, S. Jin, Y. Jin, Y.F. Lai, F. Li, G. Li, H.H. Li, J. Li, J.C. Li, Q.J. Li, R.B. Li, R.Y. Li, S.M. Li, W. Li, W.G. Li, X.L. Li, X.Q. Li, X.S. Li, Y.F. Liang, H.B. Liao, C.X. Liu, Fang Liu, F. Liu, H.M. Liu, J.B. Liu, J.P. Liu, R.G. Liu, Y. Liu, Z.A. Liu, Z.X. Liu, G.R. Lu, F. Lu, J.G. Lu, C.L. Luo, X.L. Luo, F.C. Ma, J.M. Ma, L.L. Ma, X.Y. Ma, Z.P. Mao, X.C. Meng, X.H. Mo, J. Nie, Z.D. Nie, S.L. Olsen, H.P. Peng, N.D. Qi, C.D. Qian, H. Qin, J.F. Qiu, Z.Y. Ren, G. Rong, L.Y. Shan, L. Shang, D.L. Shen, X.Y. Shen, H.Y. Sheng, F. Shi, X. Shi, L.W. Song, H.S. Sun, S.S. Sun, Y.Z. Sun, Z.J. Sun, X. Tang, N. Tao, Y.R. Tian, G.L. Tong, G.S. Varner, D.Y. Wang, J.Z. Wang, L. Wang, L.S. Wang, M. Wang, Meng Wang, P. Wang, P.L. Wang, S.Z. Wang, W.F. Wang, Y.F. Wang, Zhe Wang, Z. Wang, Zheng Wang, Z.Y. Wang, C.L. Wei, N. Wu, Y.M. Wu, X.M. Xia, X.X. Xie, B. Xin, G.F. Xu, H. Xu, Y. Xu, S.T. Xue, M.L. Yan, W.B. Yan, F. Yang, H.X. Yang, J. Yang, S.D. Yang, Y.X. Yang, L.H. Yi, Z.Y. Yi, M. Ye, M.H. Ye, Y.X. Ye, C.S. Yu, G.W. Yu, C.Z. Yuan, J.M. Yuan, Y. Yuan, Q. Yue, S.L. Zang, Y. Zeng, B.X. Zhang, B.Y. Zhang, C.C. Zhang, D.H. Zhang, H.Y. Zhang, J. Zhang, J.M. Zhang, J.Y. Zhang, J.W. Zhang, L.S. Zhang, Q.J. Zhang, S.Q. Zhang, X.M. Zhang, X.Y. Zhang, Yiyun Zhang, Y.J. Zhang, Y.Y. Zhang, Z.P. Zhang, Z.Q. Zhang, D.X. Zhao, J.B. Zhao, J.W. Zhao, P.P. Zhao, W.R. Zhao, X.J. Zhao, Y.B. Zhao, Z.G. Zhao, H.Q. Zheng, J.P. Zheng, L.S. Zheng, Z.P. Zheng, X.C. Zhong, B.Q. Zhou, G.M. Zhou, L. Zhou, N.F. Zhou, K.J. Zhu, Q.M. Zhu, Yingchun Zhu, Y.C. Zhu, Y.S. Zhu, Z.A. Zhu, B.A. Zhuang, and B.S. Zou

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Angular distribution, Positron, Proton, Branching fraction, Analytical chemistry, High Energy Physics::Experiment, Electron, Bar (unit)
Abstract

The process J/\psi --> p \bar{p} is studied using 57.7 X 10^6 J/\psi events collected with the BESII detector at the Beijing Electron Positron Collider. The branching ratio is determined to be Br(J/\psi --> p \bar{p})=(2.26 +- 0.01 +- 0.14) X 10^{-3}, and the angular distribution is well described by \frac{dN}{d cos\theta_p}=1+\alpha\cos^2\theta_p with \alpha = 0.676 +- 0.036 +- 0.042, where \theta_p is the angle between the proton and beam directions. The value of \alpha obtained is in good agreement with the predictions of first-order QCD.

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28. Calibration of the KLOE electromagnetic calorimeter

Author

Margherita Primavera, Leonardo Merola, G. Finocchiaro, G. De Zorzi, E. Santovetti, F. Cevenini, V. Casavola, S. Miscetti, F. Ambrosino, S. Conetti, G. Carboni, M. Incagli, A. Antonelli, O. Erriquez, S.W. Han, A. Franceschi, Paolo Santangelo, Fabrizio Scuri, F. Murtas, P. De Simone, B. Valeriani, F. Cervelli, F. Bossi, Juliet Lee-Franzini, G. Cataldi, G. De Robertis, L. Ingrosso, P. Franzini, S. Giovannella, E. Valente, G.W. Yu, G. Lanfranchi, L. Paoluzi, Massimo Antonelli, Enrico Pasqualucci, A. Passeri, G. Felici, R. D. Schamberger, C. Bacci, E. Graziani, F. Grancagnolo, D. Leone, S. Dell'Agnello, F. Nguyen, S. Bertolucci, M. Palutan, L. Tortora, A. G. Denig, W. Kluge, T. Spadaro, L. Passalacqua, S. Müller, A. Ventura, Francesco Lacava, F. Ruggieri, G. Capon, G. Chiefari, C. Kuo, C. Di Donato, G. Venanzoni, E. De Lucia, M. L. Ferrer, A. Nedosekin, R. Caloi, Ludovico Pontecorvo, G. Saracino, M. Martemianov, P. Branchini, M. Dreucci, S. Di Falco, E. Spiriti, Cesare Bini, G. Xu, R. Messi, V. Bocci, Edoardo Gorini, S.A. Bulychjov, P. Campana, F. Lu, Alberto Aloisio, Massimo Casarsa, P. Valente, A. Ferrari, W. Mei, Vincenzo Patera, A. Sciubba, P. Gauzzi, Emilio Petrolo, A. Farilla, Igor Sfiligoi, Stefano Veneziano, G. Bencivenni, Barbara Sciascia, Claudio Gatti, C. Bloise, G.L. Tong, A. Di Domenico, C. Forti, Filippo Ceradini, Paolo Ciambrone, M. Napolitano, M. A. Matsyuk, Andrea Doria, V. V. Kulikov, M. Moulson, A., Aloisio, F., Ambrosino, F., Cevenini, G., Chiefari, C., DI DONATO, A., Doria, L., Merola, M., Napolitano, G., Saracino, A., Antonelli, M., Antonelli, G., Bencivenni, S., Bertolucci, C., Bloise, F., Bossi, P., Campana, G., Capon, P., Ciambrone, P., DE SIMONE, S., Dell'Agnello, A., Denig, M., Dreucci, G., Felici, M. L., Ferrer, G., Finocchiaro, C., Forti, A., Franceschi, S., Giovannella, S. W., Han, L., Ingrosso, G., Lanfranchi, F., Lu, M., Matsyuk, W., Mei, S., Miscetti, M., Moulson, F., Murta, A., Nedosekin, L., Passalacqua, P., Santangelo, B., Sciascia, I., Sfiligoi, T., Spadaro, P., Valente, J., LEE FRANZINI, V., Patera, A., Sciubba, C., Bini, V., Bocci, R., Caloi, E., DE LUCIA, G., DE ZORZI, A., DI DOMENICO, P., Franzini, P., Gauzzi, F., Lacava, D., Leone, E., Pasqualucci, E., Petrolo, L., Pontecorvo, E., Valente, S., Veneziano, R. D., Schamberger, G. L., Tong, G., Xu, G. W., Yu, C., Bacci, P., Branchini, F., Ceradini, A., Farilla, A., Ferrari, E., Graziani, F., Nguyen, M., Palutan, A., Passeri, E., Spiriti, L., Tortora, G., Carboni, R., Messi, L., Paoluzi, E., Santovetti, M., Casarsa, F., Scuri, V., Casavola, G., Cataldi, Gorini, Edoardo, F., Grancagnolo, M., Primavera, Ventura, Andrea, F., Cervelli, S., DI FALCO, C., Gatti, M., Incagli, G., Venanzoni, G., DE ROBERTIS, O., Erriquez, F., Ruggieri, S. A., Bulychjov, V., Kulikov, W., Kluge, CHEN CHENG, Kuo, M., Martemyanov, S., Muller, B., Valeriani, and S., Conetti

Subjects
Nuclear physics, Physics, Particle physics, Electromagnetic calorimeter, Calibration (statistics)

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