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Start Over Author "Y. C. Lou" Journal physical review letters
8 results on '"Y. C. Lou"'

1. Anomalous line shape of the cross section for e{+}e{-}--hadrons in the center-of-mass energy region between 3.650 and 3.872 GeV

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, 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, 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, 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

We observe an obvious anomalous line shape of the e;{+}e;{-}--hadrons total cross sections in the energy region between 3.700 and 3.872 GeV. It is inconsistent with the explanation for only one simple psi(3770) resonance with a statistical significance of 7sigma. The anomalous line shape may be explained by two possible enhancements of the inclusive hadron production near the center-of-mass energies of 3.764 and 3.779 GeV, indicating that either there is likely a new structure in addition to the psi(3770) resonance around 3.773 GeV, or there are some physics effects reflecting the DD[over ] production dynamics.

Published
2008

2. Search for the Invisible Decay ofJ/ψinψ(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, 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

Subjects
Physics, Particle decay, Pair production, Pi, Analytical chemistry, General Physics and Astronomy, High Energy Physics::Experiment
Abstract

Using {psi}(2S){yields}{pi}{sup +}{pi}{sup -}J/{psi} events in a sample of 14.0x10{sup 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 1.2x10{sup -2} for the ratio (B(J/{psi}{yields}invisible)/B(J/{psi}{yields}{mu}{sup +}{mu}{sup -})). This is the first search for J/{psi} decays to invisible final states.

Published
2008
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3. 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

4. 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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5. 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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6. 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

7. 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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8. 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

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