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2. Measurement of the Mass of the τ Lepton

Author

T. H. Burnett, S. T. Xue, F. Li, H. L. Ni, W. G. Li, Jun-Bing Ma, H. S. Zhou, G. Y. Hu, Q. Liu, Z. D. Cheng, G. P. Zhou, O. Bardon, E. Soderstrom, Wei Li, Y. H. Zhou, Michael J. Fero, Z. J. Jiang, J. S. Whitaker, Chunmei Zhang, L. P. Zhou, Z. P. Mao, Robert Wilson, S. D. Gu, D. H. Ma, W. G. Yan, Q. P. Jia, L. J. Pan, T. Hu, H. Marsiske, D. L. Shen, M. L. Gao, Y. S. Li, C. M. Yang, R. Cowan, W. X. Gao, M. Mandelkern, Ming-Han Ye, Q. M. Zhu, W. D. Li, Yuanyuan Wang, J. W. Zhang, J. A. Coller, S. Z. Lin, D. G. Hitlin, W. R. Zhao, E. Torrence, H. M. Liu, Lei Zhang, Q. M. Li, Z. P. Zheng, Y. F. Lai, Y. B. Liu, D. M. Xi, Y. N. Gao, Joseph Izen, G. Rong, L. S. Zheng, Y. Zhang, X. M. Xia, J. Yan, Pihong Zhao, H. Y. Zhang, J. Panetta, J. S. Campbell, A. S. Johnson, S. M. Chen, D. X. Zhao, B. Y. Zhang, W. X. Gu, Y. C. Zhu, P. Wang, G. L. Tong, M. Z. Wang, X. C. Meng, Z. Q. Xu, W. H. Toki, P. L. Wang, X. F. Zhou, Junguang Lu, P. F. Lang, Xingzhu Cui, H. C. Cui, H. Z. Shi, H. S. Sun, S. Q. Zhang, D. Q. Huang, T. J. Wang, A. J. S. Smith, J. Synodinos, R. Becker-Szendy, J. Z. Bai, Ya-Nan Guo, C. Y. Yang, S. Q. Gao, X. F. Song, Y. Q. Chen, H. L. Ding, Xin Wu, D. P. Stoker, C. Fang, L. Z. Wang, X. X. Xie, R. K. Yamamoto, M. H. Kelsey, R. S. Xu, J. C. Li, Y. K. Que, H. S. Mao, Y. S. Zhu, S. Z. Ye, M. Hatanaka, W. Dunwoodie, M. G. Zhao, Z. Q. Yu, W. J. Wisniewski, G. Zioulas, J. H. Gu, J. Schultz, J. Quigley, S. J. Chen, L. Jones, B. Lowery, Chun-Hua Jiang, J. J. He, P. P. Xie, P. Q. Li, Y. Y. Shao, Jinxing Zheng, E. C. Ma, H. L. Zhang, E. Prabhakar, A. J. Lankford, H. B. Yao, J. T. Shank, D. H. Zhang, H. Y. Sheng, N. D. Qi, Z. Z. Du, R. G. Liu, B. Schmid, Y. L. Han, R. B. Li, Y. Z. Huang, F. C. Porter, and Y. N. Guo

Subjects
Physics, Particle physics, Lepton
Published
2020
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3. Direct Measurement of the Pseudoscalar Decay Constant, fDs

Author

Z. P. Zheng, Y. Jin, J. C. Li, C. C. Zhang, D. Paluselli, G. P. Zhou, J. G. Lu, G. Zioulas, S. Z. Lin, W. R. Zhao, Z. A. Liu, L. S. Wang, M. H. Ye, R. B. Li, I. Blum, Z. Q. Xu, Y. H. Zhou, K. R. He, R. J. Wilson, Chun-Hua Jiang, D. P. Stoker, J. H. Liu, T. J. Wang, S. Whittaker, R. Malchow, G. L. Tong, T. Hu, Michael Schernau, W. Yang, B. A. Zhuang, P. Gratton, Q. P. Jia, J. Panetta, S. M. Chen, X. M. Xia, H. B. Lan, W. X. Zhao, S. Q. Gao, J. Nie, J. Fang, L. S. Zheng, X. R. Shi, Y. Z. Huang, G. P. Chen, Y. B. Liu, Y. Zhang, Y. C. Zhu, O. Bardon, P. L. Wang, E. Soderstrom, H. Shen, Wei Li, D. X. Zhao, B. Y. Zhang, F. C. Porter, F. Sun, X. Q. Hu, W. D. Li, Y. F. Gu, S. H. Kang, D. Z. Xu, J. M. lzen, X. F. Zhou, D. Q. Huang, R. S. Xu, Y. Y. Wang, Y. Y. Shao, C. S. Gao, D. G. Hitlin, M. He, D. L. Shen, J. Quigley, S. Z. Ye, M. Hatanaka, M. Mandelkern, C. Z. Yuan, H. B. Hu, R. G. Liu, Jinxing Zheng, S. J. Chen, H. S. Mao, B. K. Kim, Y. Q. Chen, S. T. Xue, J. W. Zhang, B. Schmid, B. S. Cheng, J. Z. Bai, A. Breakstone, Q. Liu, Xingzhu Cui, M. G. Zhao, G. Y. Hu, F. A. Harris, L. Jones, J. H. Gu, J. Schultz, X. L. Fan, F. Li, H. L. Ni, H. C. Cui, Y. K. Que, J. Chen, Li Zhou, H. B. Yao, Q. M. Zhu, H. Z. Shi, P. Wang, Jun-Bing Ma, Y. P. Tan, S. M. Wang, D. M. Xi, J. Yan, S. W. Han, J. Synodinos, X. F. Song, P. P. Xie, X. Y. Shen, P. F. Lang, J. W. Zhao, S. D. Gu, S. Q. Zhang, L. Z. Wang, A. M. Ma, H. S. Zhou, J. J. He, M. Z. Wang, H. L. Ding, M. H. Kelsey, Y. N. Guo, E. Torrence, H. S. Sun, X. C. Lou, J. Oyang, H. Y. Sheng, W. Dunwoodie, R. K. Yamamoto, Y. L. Han, P. Q. Li, M. L. Gao, W. G. Li, Xinglong Li, D. H. Zhang, J. Y. Zhang, X. Q. Li, S. Q. Tang, Pihong Zhao, W. J. Wisniewski, C. S. Yu, C. X. Yu, B. Lowery, W. X. Gu, R. Cowan, E. Prabhakar, Y. B. Chen, W. H. Toki, C. Y. Yang, N. D. Qi, H. M. Liu, A. J. Lankford, Y. F. Lai, H. F. Chen, X. C. Meng, W. F. Wang, J. Standifird, L. J. Pan, Michael J. Fero, Y. Y. Zhang, A. J. S. Smith, Y. S. Zhu, C. M. Yang, W. X. Gao, Z. Z. Du, W. G. Yan, S. J. Sun, E. C. Ma, Lei Zhang, H. L. Zhang, G. Rong, Z. Q. Yu, S.L. Olsen, T. H. Burnett, F. Wang, Z. P. Mao, and Q. Y. Li

Subjects
Physics, Pseudoscalar, Particle physics, Exponential decay
Published
2020
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4. Impact of Flower Position and Pollinator Diversity on Yield Parameters of Pomegranate (Punica granatum L.)

Author

K. T. Vijayakaumar, H. L. Nithin Kumar, T. N. Rakshita, and T. Nayimabanu

Subjects
Pollination, Floral biology, Fruit, Apiculture, Honey bees, Pomegranate, Zoology, QL1-991, Ecology, QH540-549.5, Natural history (General), QH1-278.5
Abstract

The present study investigated the flower position characteristics of Pomegranate (variety: Bhagwa) pollinator diversity and their effect on fruit yield. The study covered floral biology, fruit attributes related to size, flower vigor, stigma receptivity, and aril development. The presence of both staminate (male) and hermaphrodite (bisexual) flowers in pomegranate allows it to be self- and cross-pollinated. The pomegranate inflorescence is a cyme. Flowers can appear solitary on spurs and in pairs or clusters terminally. The study revealed that the weight of pomegranate fruit resulting from the solitary flower was higher (351 g) with a greater number of arils (743 per fruit) than the fruit from the terminal flower (306.67 g and 620 arils) and lateral flower (221 g and 352 arils). Studies on modes of pollination provide evidence that qualitative and quantitative traits of fruits were improved by open and Apis cerana pollination. A total of 19 species of flower visitors were recorded. Apis dorsata was the primary flower visitor, followed by A. florea and A. cerana. The yield per plant under open conditions was 24.93 kg, which was on par with bee-pollinated (22.76 kg) and significantly higher than the control (15.36 kg).

Published
2024
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6. Preparation and transport properties of CeSi2/HMS thermoelectric composites

Author

Aijun Zhou, Q.A. Zhang, H. L. Ni, Tiejun Zhu, and Xinbing Zhao

Subjects
Materials science, Scattering, Mechanical Engineering, Metals and Alloys, Microstructure, Hot pressing, Mechanics of Materials, Electrical resistivity and conductivity, Seebeck coefficient, Thermoelectric effect, Materials Chemistry, Grain boundary, Composite material, Excitation
Abstract

The composites of higher manganese silicide (HMS) and CeSi 2 were fabricated in the formulation of (CeSi 2 ) x (MnSi 1.75 ) 1− x ( x = 0, 0.01, 0.03, 0.045, 0.06, 0.08, and 0.1) by rapid solidification followed by hot-pressing. The phase structures and morphologies of the hot-pressed composites were investigated, and the Seebeck coefficient and the electrical conductivity were measured from 300 K to 1050 K. The dual effect of lattice scattering and the intrinsic excitation of carriers were discussed on the temperature dependences of the Seebeck coefficient and the electrical conductivity. It was found that the CeSi 2 particles distribute primarily on the HMS grain boundaries. The addition of CeSi 2 reduced the Seebeck coefficient and increased the electrical conductivity of HMS. The power factors were also decreased by the addition of CeSi 2 .

Published
2008
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7. Effect of diamond trip geometries on boundary layer transition for hypersonic inlet

Author

M. R. Yi, Z. M. Zhang, H. Y. Zhao, and H. L. Ni

Subjects
geography, geography.geographical_feature_category, business.industry, Computation, Diagonal, Mechanical engineering, Diamond, Mechanics, engineering.material, Inlet, symbols.namesake, Boundary layer, Mach number, Heat transfer, engineering, symbols, Hypersonic wind tunnel, business
Abstract

In order to grasp the effect of diamond trip geometries on boundary layer transition of hypersonic inlet, an experiment at Mach number 6 in a hypersonic wind tunnel was performed for a hypersonic inlet. The heat transfers at the inlet wall were measured through the infrared thermography. The transition region was judged by the comparison of heat transfer between experiment and computation. Ten diamond forced transition trips were designed according to Modern Design of Experiments. The experimental results shown that the effect order of trip geometries on transition region were the trip height, distance between diamond elements and diagonal length of diamond element from the largest to the smallest. Transition region moved forward to the model tip with increasing trip height or trip length, or with decreasing distance between diamond elements, or with increasing diagonal length of element. The optimized configuration was obtained for diamond forced-transition trip when the optimization object was transitio...

Published
2016
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8. Hydrothermally synthesized and hot-pressed Bi2(Te,Se)3 thermoelectric alloys

Author

H. L. Ni, Tiejun Zhu, and X.B. Zhao

Subjects
Materials science, Scanning electron microscope, Doping, Analytical chemistry, Condensed Matter Physics, Hot pressing, Thermoelectric materials, Electronic, Optical and Magnetic Materials, chemistry.chemical_compound, chemistry, Seebeck coefficient, Thermoelectric effect, Bismuth telluride, Crystallite, Electrical and Electronic Engineering
Abstract

Bi 2 (Te,Se) 3 nanopowders have been synthesized by an aqueous chemical route in an open beaker at 70 °C for 72 h. The powders were hot-pressed under a pressure of 50 MPa at 250 °C for 15 min. X-ray diffraction and energy-dispersive analysis of X-rays show that both the powders and the hot-pressed samples are mainly composed of Bi 2 (Te,Se) 3 and Te. Scanning electron microscopy observation shows that the crystallite size is smaller than 100 nm in the powders and the width of the polygonal prismatic rods is about 100 nm in the hot-pressed sample. The alloys were doped with SbI 3 before hot pressing. The SbI 3 -doped sample shows a higher electrical conductivity and a lower Seebeck coefficient, indicating that SbI 3 is electrically actively incorporated into the alloys.

Published
2005
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9. Mapping and analysis of microscopic Seebeck coefficient distribution

Author

Gabriele Karpinski, Xinbing Zhao, Eckhard Müller, and H. L. Ni

Subjects
Zone melting, Materials science, Condensed matter physics, hot probe, Scanning electron microscope, Mechanical Engineering, thermoelectric materials, Doping, metals, Mineralogy, SMP, Seebeck coefficient, semiconductors, Thermoelectric materials, Hot pressing, Seebeck Micro Probe, inhomogeneity, Distribution (mathematics), Mechanics of Materials, bismuth telluride, Thermoelectric effect, General Materials Science, spatial resolution
Abstract

Understanding the local Seebeck coefficient distribution is helpful for the development of novel thermoelectric materials. Seebeck coefficient distributions of both zone melted and hot pressed samples of I-doped Bi2Te3 based alloys were measured using microscopic Seebeck coefficient mapping method. Seebeck coefficient differences up to 40–50 μV/K were found between different locations on the same sample. There is no visible relationship between the microscopic Seebeck coefficient distribution and the local surface morphology and element distributions. It is suggested that the local Seebeck coefficient variations were mainly originated from the lattice defects for the zone melted sample and also due to the grain orientation for the hot pressed sample.

Published
2005
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10. The BES upgrade

Author

G. S. Huang, X. C. Meng, J. Y. Zhang, J. Standifird, W. G. Yan, J. Oyang, Jun-Bing Ma, J. Schultz, M.H. Kelsey, J. Z. Bai, L. S. Wang, B. Yang, P. Zhang, Y. K. Heng, Y. Y. Zhang, Jun Wang, Chunmei Zhang, J. Li, Joseph Izen, H. Luo, Y. Yuan, Y. S. Zhu, B. W. Shen, Y. Q. Chen, Hao-Ze Chen, Z.R. Wan, Z. Q. Xu, H. Y. Sheng, Jiming Yang, H.G. Han, M. G. Zhao, X.M. Chu, C. X. Yu, Qiyang Zhang, Y. W. Liu, P. Wang, H. S. Mao, Zhengguo Zhao, G. Y. Hu, T. J. Wang, N. D. Qi, W.H. Li, G. P. Chen, M. Mandelkern, C. Z. Yuan, L. Y. Dong, Xinchou Lou, He-Run Yang, S.T. Xu, C.S. Yang, H. Z. Shi, B. S. Cheng, H. M. Liu, Dehong Zhan, X. F. Song, D. P. Stoker, P. F. Lang, M. Weaver, Y.Y. Du, D. Paluselli, R. B. Li, Y.Y. Jiang, D. Kong, H.Y. Lu, Qian Liu, L. Zhang, L. Z. Wang, B. K. Kim, X. Q. Hu, Y. H. Xie, J. H. Gu, Ming-Han Ye, Qi Liu, T. Hu, M. L. Gao, C. C. Xu, H. W. Zhao, Y. K. Que, J. Chen, Li Zhou, H. M. Hu, Cheng-Kui Li, J. C. Chen, R. Malchow, D. X. Zhao, B. Y. Zhang, Jiurong Liu, Y. Z. Sun, Y. Y. Wang, J. Fang, L. S. Zheng, Wei Li, C. D. Qian, M. He, H. B. Li, W. Y. Ding, C. Y. Yang, X. Y. Shen, S. D. Gu, Yuanbo Chen, X. L. Luo, D. L. Shen, D.J. Yang, Z. Z. Du, S. J. Sun, Xingzhu Cui, Z. X. Liu, B. D. Jones, Y. H. Qu, W. J. Xiong, J. L. Hu, Yue-Yuan Zhang, Q. Xie, H. L. Ni, S. Q. Tang, C. M. Yang, G. S. Varner, Y. Jin, G. A. Yang, K. J. Zhu, W. X. Gu, W. H. Toki, X. Xiao, S.C. Zheng, S. Q. Gao, Z. J. Ke, Z. P. Zheng, W. Dunwoodie, Y. F. Lai, P. P. Xie, C.C. Zhong, X. Ju, G. L. Tong, B. A. Zhuang, H. Shen, X. H. Mo, J. F. Qiu, L.G. Mu, Y. P. Tan, P. Q. Li, W. G. Li, J.S. Lou, S. M. Wang, Junguang Lu, Cunfeng Wei, H. L. Ding, S. W. Han, R. G. Liu, Y. J. Sun, Frank C. Porter, Jun Liu, B. Schmid, Q. H. Hu, H. S. Zhou, P. Gratton, J. Panetta, Y. C. Zhu, X. M. Xia, Xingguo Li, F. Sun, Z. W. Chai, J. Zhao, X. F. Zhou, Meng Wang, F. A. Harris, H.C. Bao, D. M. Xi, J. Yan, Lin. Zhang, Y. H. Yu, G. Rong, Jiang Changhui, E. C. Ma, H. L. Zhang, Stephen L. Olsen, D. H. Zhang, C. S. Yu, A. J. Lankford, X. N. Li, D. G. Hitlin, J. H. Liu, Michael Schernau, W. Yang, J. Nie, Y. Y. Shao, C. S. Gao, Jinxing Zheng, J. D. Huang, F. Wang, Z. P. Mao, Q. M. Zhu, H. S. Sun, Z. Q. Yu, Y. N. Guo, F. Y. Li, J. W. Zhang, W. Z. Fang, B. Lowery, Y. B. Chen, Y. L. Han, S. Q. Luo, I. Blum, Y. Z. Huang, Q. Y. Li, J. He, S. Q. Zhang, W.L. Yao, G.P. Zho, L. J. Pan, Bing Zhou, W. R. Zhao, X. R. Qi, Yuehong Xie, H. B. Hu, P. L. Wang, and Xuan Yang

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, Physics::Instrumentation and Detectors, Detector, Solenoid, Particle accelerator, Computer Science::Digital Libraries, Computer Science::Computers and Society, Particle detector, law.invention, Nuclear physics, Upgrade, Beijing, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, Instrumentation
Abstract

The Beijing Spectrometer (BES) detector is a general purpose solenoid detector at the Beijing Electron Positron Collider (BEPC) in Beijing, China, that has collected large numbers of J/ψ, ψ′, Ds, D and τ events. In this paper, we describe the recent upgrade of the initial BES detector (BESI) to the improved BESII detector.

Published
2001
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11. Evidence for the leptonic decay D→μν

Author

J. Panetta, O. Bardon, S. M. Chen, Y. C. Zhu, E. Soderstrom, Wei Li, K. K. Young, P. L. Wang, X. F. Zhou, H. Y. Sheng, L. J. Pan, C. X. Yu, Q. Liu, Y. Luo, N. D. Qi, Michael J. Fero, Q. Y. Li, C. M. Yang, G. Zioulas, S. Q. Zhang, J. He, Chun-Hua Jiang, R. B. Li, H. S. Mao, S. Z. Lin, W. R. Zhao, H. W. Zhao, J. C. Li, Y. Zhang, S. Whittaker, J. G. Lu, F. A. Harris, L. Jones, T. H. Burnett, D. Kong, Y. P. Tan, S. Q. Tang, Y. H. Zhou, X. R. Shi, Z. P. Zheng, R. J. Wilson, D. H. Zhang, C. S. Yu, B. S. Cheng, G. P. Chen, S. Jin, L. P. Zhou, F. Wang, T. Hu, C. Y. Yang, Z. Z. Du, S. J. Sun, S. M. Wang, R. Cowan, Z. P. Mao, D. Z. Xu, G. L. Tong, W. D. Li, E. Prabhakar, J. H. Gu, X. C. Meng, B. A. Zhuang, F. Li, J. Standifird, H. L. Ni, R. G. Liu, J. Schultz, Xingzhu Cui, A. J. Lankford, B. Schmid, S. H. Kang, P. F. Lang, R. K. Yamamoto, G. P. Zhou, D. Q. Huang, D. G. Hitlin, Z. A. Liu, H. Shen, M. Mandelkern, C. Z. Yuan, Y. L. Han, A. J. S. Smith, Y. Jin, Q. P. Jia, Cunfeng Wei, J. Y. Zhang, E. Torrence, A. Breakstone, L. S. Wang, M. H. Ye, R. S. Xu, C. C. Zhang, S. T. Xue, X. L. Fan, B. K. Kim, P. Gratton, Y. S. Zhu, H. L. Ding, J. Z. Bai, W. G. Yan, Y. K. Que, X. M. Xia, J. W. Zhang, Y. Y. Zhang, M. L. Gao, J. W. Zhao, E. C. Ma, T. J. Wang, Z. Q. Xu, Lei Zhang, X. Q. Hu, Z. Q. Yu, D. Paluselli, Joseph Izen, H. L. Zhang, Y. F. Gu, G. Rong, H. Z. Shi, D. M. Xi, W. J. Wisniewski, Y. B. Chen, J. Yan, D. X. Zhao, B. Y. Zhang, M. He, J. Synodinos, Y. F. Lai, H. F. Chen, D. P. Stoker, J. C. Chen, D. L. Shen, Y. Y. Wang, R. Malchow, X. F. Song, X. Y. Shen, Jun-Bing Ma, J. Quigley, J. Oyang, J. Fang, L. S. Zheng, S. Q. Gao, Z. J. Ke, S. J. Chen, L. Z. Wang, S. D. Gu, G. Y. Hu, B. Lowery, M. H. Kelsey, M. G. Zhao, W. Dunwoodie, F. Sun, Q. M. Zhu, S. W. Han, M. Z. Wang, S. Q. Luo, H. S. Sun, X. N. Li, I. Blum, X. C. Lou, A. M. Ma, H. S. Zhou, J. H. Liu, Y. Z. Huang, Michael Schernau, W. Yang, F. C. Porter, J. Nie, Y. Y. Shao, C. S. Gao, Jinxing Zheng, W. X. Gu, Y. N. Guo, S. L. Olsen, W. H. Toki, H. B. Lan, S. Z. Ye, M. Hatanaka, P. P. Xie, P. Q. Li, W. G. Li, H. M. Liu, P. Wang, Y. B. Liu, Y. Q. Chen, and X. H. Li

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Branching fraction, Electron–positron annihilation, Nuclear physics, Pseudoscalar, D meson, High Energy Physics::Experiment, Center of mass, Exponential decay, Neutrino, Nuclear Experiment
Abstract

Purely leptonic decays of the charged D meson have been studied using the reaction e + e − →D ∗+ D − at a center of mass energy of 4.03 GeV. A search was performed for D→μνμ recoiling against a D0 or D+ which had been reconstructed from its hadronic decay products. A single event candidate was found in the reaction e + e − →D ∗+ D − , where D ∗+ →π + D 0 with the D0→K−π+, and the recoiling D− decaying via D − →μ − ν μ . This yields a branching fraction value B(D→μνμ)=0.08−0.05−0.02+0.16+0.05%, and a corresponding value of the pseudoscalar decay constant fD=300−150−40+180+80 MeV.

Published
1998
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12. Direct measurement ofB(Ds+→φX+)

Author

J. Z. Bai, O. Bardon, I. Blum, A. Breakstone, T. Burnett, G. P. Chen, H. F. Chen, J. Chen, S. J. Chen, S. M. Chen, Y. Chen, Y. B. Chen, Y. Q. Chen, B. S. Cheng, R. F. Cowan, X. Z. Cui, H. L. Ding, Z. Z. Du, W. Dunwoodie, X. L. Fan, J. Fang, C. S. Gao, M. L. Gao, S. Q. Gao, P. Gratton, J. H. Gu, S. D. Gu, W. X. Gu, Y. F. Gu, Y. N. Guo, S. W. Han, Y. Han, F. A. Harris, J. He, M. He, D. G. Hitlin, G. Y. Hu, T. Hu, X. Q. Hu, D. Q. Huang, Y. Z. Huang, J. M. Izen, C. H. Jiang, S. Jin, Y. Jin, L. Jones, S. H. Kang, Z. J. Ke, M. H. Kelsey, B. K. Kim, D. Kong, Y. F. Lai, H. B. Lan, P. F. Lang, A. Lankford, F. Li, J. Li, P. Q. Li, Q. Li, R. B. Li, W. Li, W. D. Li, W. G. Li, X. H. Li, X. N. Li, S. Z. Lin, H. M. Liu, J. Liu, J. H. Liu, Q. Liu, R. G. Liu, Y. Liu, Z. A. Liu, X. C. Lou, B. Lowery, J. G. Lu, J. Y. Lu, S. Luo, Y. Luo, A. M. Ma, E. C. Ma, J. M. Ma, R. Malchow, M. Mandelkern, H. S. Mao, Z. P. Mao, X. C. Meng, H. L. Ni, J. Nie, S. L. Olsen, J. Oyang, D. Paluselli, L. J. Pan, J. Panetta, F. Porter, E. Prabhakar, N. D. Qi, Y. K. Que, G. Rong, M. Schernau, B. Schmid, J. Schultz, Y. Y. Shao, D. L. Shen, H. Shen, X. Y. Shen, H. Y. Sheng, H. Z. Shi, E. Soderstrom, X. F. Song, J. Standifird, D. Stoker, F. Sun, H. S. Sun, S. J. Sun, J. Synodinos, Y. P. Tan, S. Q. Tang, W. Toki, G. L. Tong, F. Wang, L. S. Wang, L. Z. Wang, M. Wang, P. Wang, P. L. Wang, S. M. Wang, T. J. Wang, Y. Y. Wang, M. Weaver, C. L. Wei, W. J. Wisniewski, D. M. Xi, X. M. Xia, P. P. Xie, D. Z. Xu, R. S. Xu, Z. Q. Xu, S. T. Xue, J. Yan, W. G. Yan, C. M. Yang, C. Y. Yang, H. Yang, W. Yang, M. H. Ye, S. Z. Ye, K. Young, C. S. Yu, C. X. Yu, Z. Q. Yu, C. Z. Yuan, B. Y. Zhang, C. C. Zhang, D. H. Zhang, H. L. Zhang, J. Zhang, J. W. Zhang, L. S. Zhang, S. Q. Zhang, Y. Zhang, Y. Y. Zhang, D. X. Zhao, J. W. Zhao, M. Zhao, W. R. Zhao, J. P. Zheng, L. S. Zheng, Z. P. Zheng, G. P. Zhou, H. S. Zhou, L. Zhou, X. F. Zhou, Y. H. Zhou, Q. M. Zhu, Y. C. Zhu, Y. S. Zhu, and B. A. Zhuang

Subjects
Hadronic decay, Nuclear physics, Physics, Nuclear and High Energy Physics, Pair production, Luminosity (scattering theory), Branching fraction
Abstract

The absolute inclusive branching fraction of D_s^+→φX^+ has been measured from data collected by the BES detector at a center-of-mass energy of 4.03 GeV, corresponding to an integrated luminosity of 22.3 pb^(-1). At this energy, direct pair production e^+e^-→D_s^+D_s^- has been observed. We have selected D_s candidate events by reconstructing five hadronic decay modes D_s^+→φπ^+, K^(0*)K^+, K^0K^+, f0^(π+) and K^0K^-π^+π^+ and have searched for inclusive φ’s in the recoiling D_s^-. We observed three recoiling φ’s in the 166.4 ± 31.8 D_s candidate events, which leads to the absolute branching fraction B(D_s^+→φX^+)=(17.8(-7.2 -6.3)^(+15.1+0.6)) % and B(D_s-6.3+→φπ-6.3+)=(3.6_(-1.6 -1.3)(^_3.1+0.4) %. [S0556-2821(97)02423-5]

Published
1998
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13. Measurement of the branching fraction ofDsinclusive semileptonic decayDs+→e+X

Author

O. Bardon, J. Y. Lu, Q. P. Jia, J. C. Li, Kai Yi, L. Zhang, B. W. Shen, Michael J. Fero, Y. B. Liu, J. Panetta, P. F. Lang, X. C. Meng, F. A. Harris, C. C. Zhang, S. M. Chen, Y. C. Zhu, Y. Luo, J. T. He, X. Q. Hu, J. Standifird, C. M. Yang, Jun Wang, Y. Q. Chen, X. H. Li, Y. F. Gu, M. L. Gao, S. Z. Lin, W. R. Zhao, M. He, P. L. Wang, Meng Wang, S. D. Gu, X. L. Fan, D. L. Shen, Jun-Bing Ma, H. B. Lan, Y. Zhang, W. J. Xiong, Z. P. Zheng, Dehong Zhang, J. L. Hu, Y. G. Wu, Qiyang Zhang, Y. Jin, L. Jones, Chun-Hua Jiang, Y. B. Chen, E. Soderstrom, B. Lowery, Z. Q. Yu, S. Q. Tang, J. G. Lu, Z. Q. Xu, H. Z. Shi, S. Q. Zhang, J. H. Liu, R. B. Li, Y. H. Zhou, Xiru Huang, X. F. Song, Y. F. Lai, H. L. Ni, J. W. Zhao, Michael Schernau, W. Yang, Wei Li, H. F. Chen, L. Z. Wang, G. L. Tong, G. F. Xu, S. Z. Ye, M. H. Kelsey, J. Nie, S. Jin, Xuan Yang, B. A. Zhuang, T. Hu, S. T. Xue, L. J. Pan, J. Oyang, Q. H. Hu, E. C. Ma, J. F. Qiu, G. Y. Hu, Y. Y. Shao, C. S. Gao, W. X. Gu, H. L. Zhang, W. G. Yan, Jinxing Zheng, W. H. Toki, D. M. Xi, T. H. Burnett, D. G. Hitlin, J. Yan, D. P. Stoker, H. Yang, Q. M. Zhu, P. Gratton, L. P. Zhou, Lei Zhang, F. Wang, C. Y. Yang, X. M. Xia, Z. P. Mao, F. Sun, T. J. Wang, M. Z. Wang, Z. W. Chai, Joseph Izen, G. Rong, H. S. Sun, X. N. Li, Y. S. Zhu, J. Synodinos, J. Yang, L. S. Wang, M. H. Ye, X. Y. Shen, R. S. Xu, Y. H. Qu, E. Prabhakar, J. G. Bian, A. J. Lankford, Y. K. Que, J. Chen, W. Dunwoodie, G. P. Chen, W. D. Li, D. Z. Xu, B. K. Kim, S. W. Han, H. S. Mao, A. M. Ma, H. S. Zhou, Q. Y. Li, J. He, Stephen L. Olsen, B. S. Cheng, D. H. Zhang, C. S. Yu, X. Y. Zhang, R. G. Liu, J. H. Gu, J. Schultz, B. Schmid, K. K. Young, J. P. Liu, S. Q. Gao, Z. J. Ke, W. G. Li, H. Shen, H. M. Liu, Cunfeng Wei, P. P. Xie, P. Q. Li, J. W. Zhang, D. X. Zhao, B. Y. Zhang, Y. Y. Wang, Q. Liu, R. Cowan, S. W. Ye, M. Weaver, Xingzhu Cui, Z. T. Yu, A. Breakstone, Y. N. Guo, Y. L. Han, S. Q. Luo, I. Blum, H. W. Zhao, Y. Z. Huang, F. C. Porter, D. Paluselli, D. Kong, Y. P. Tan, P. Wang, M. G. Zhao, S. M. Wang, X. R. Shi, J. C. Chen, F. Lu, Xuanhong Lou, R. Malchow, J. Fang, L. S. Zheng, G. P. Zhou, Z. Z. Du, S. H. Kang, S. J. Sun, J. Y. Zhang, M. Mandelkern, C. Z. Yuan, Y. Y. Zhang, H. L. Ding, W. J. Wisniewski, Z. A. Liu, J. Z. Bai, H. Y. Sheng, C. X. Yu, and N. D. Qi

Subjects
Hadronic decay, Combinatorics, Physics, Semileptonic decay, Nuclear and High Energy Physics, Meson, Branching fraction
Abstract

Author(s): Bai, JZ; Bardon, O; Bian, JG; Blum, I; Breakstone, A; Burnett, T; Chai, ZW; Chen, GP; Chen, HF; Chen, J; Chen, JC; Chen, SM; Chen, Y; Chen, YB; Chen, YQ; Cheng, BS; Cowan, RF; Cui, XZ; Ding, HL; Du, ZZ; Dunwoodie, W; Fan, XL; Fang, J; Fero, M; Gao, CS; Gao, ML; Gao, SQ; Gratton, P; Gu, JH; Gu, SD; Gu, WX; Gu, YF; Guo, YN; Han, SW; Han, Y; Harris, FA; He, J; He, JT; He, M; Hitlin, DG; Hu, GY; Hu, JL; Hu, QH; Hu, T; Hu, XQ; Huang, XP; Huang, YZ; Izen, JM; Jia, QP; Jiang, CH; Jin, S; Jin, Y; Jones, L; Kang, SH; Ke, ZJ; Kelsey, MH; Kim, BK; Kong, D; Lai, YF; Lan, HB; Lang, PF; Lankford, A; Li, J; Li, PQ; Li, Q; Li, RB; Li, W; Li, WD; Li, WG; Li, XH; Li, XN; Lin, SZ; Lu, F; Liu, HM; Liu, J; Liu, JH; Liu, Q; Liu, RG; Liu, Y; Liu, ZA; Lou, XC; Lowery, B; Lu, JG; Lu, JY; Luo, SQ | Abstract: The absolute inclusive semileptonic branching fraction of the [Formula presented] meson has been measured based on [Formula presented] of [Formula presented] collision data collected with the Beijing Spectrometer at [Formula presented] At this energy, the [Formula presented] are produced in pairs: [Formula presented] We reconstructed [Formula presented] [Formula presented] events in five hadronic decay modes. In the recoil system of these events, several [Formula presented] inclusive semileptonic decays were observed and the branching fraction is estimated to be [Formula presented] © 1997 The American Physical Society.

Published
1997
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14. Structure Analysis of thefJ(1710)in the Radiative DecayJ/ψ→γK+K−

Author

M. L. Gao, Y. L. Han, Y. B. Chen, Xuan Yang, L. C. Lu, Y. F. Lai, Kai Yi, F. Lu, H. F. Chen, L. S. Wang, H. B. Lan, M. H. Ye, W. G. Yan, Y. P. Tan, S. M. Wang, S. Q. Zhang, Jun-Bing Ma, Lei Zhang, S. Q. Luo, H. L. Ni, G. Rong, S. Z. Lin, W. R. Zhao, Y. Zhang, S. D. Gu, S. W. Han, B. W. Shen, Z. Z. Du, Jiming Yang, S. J. Sun, A. M. Ma, X. Q. Hu, H. S. Zhou, G. P. Zhou, S. H. Kang, Q. H. Hu, E. C. Ma, C. Z. Yuan, C. C. Zhang, Z. D. Cheng, X. Y. Zhang, R. G. Liu, H. L. Zhang, Y. F. Gu, J. F. Qiu, Q. J. Li, Wei Li, Y. Z. Huang, S. Q. Tang, J. G. Bian, Qiyang Zhang, D. L. Shen, X. C. Meng, W. J. Xiong, Y. Jin, H. W. Zhao, S. Q. Gao, Z. J. Ke, De. H. Zhang, W. X. Gu, P. Wang, L. Zhang, Z. A. Liu, J. C. Li, F. Sun, H. S. Mao, W. H. Zhao, W. Y. Ding, C. Y. Yang, Z. P. Zheng, P. F. Lang, S. M. Chen, Y. C. Zhu, H. L. Ding, B. S. Cheng, P. L. Wang, Men Wang, G. F. Xu, S. Jin, Y. N. Guo, T. J. Wang, J. H. Gu, Xiru Huang, J. Z. Bai, D. H. Zhang, G. L. Tong, C. S. Yu, Y. Luo, H. Shen, R. B. Li, Z. Q. Xu, Y. H. Qu, J. T. He, B. A. Zhuang, Y. S. Zhu, Q. Liu, R. S. Xu, J. G. Lu, Y. G. Xie, H. Y. Sheng, J. He, Y. H. Zhou, Y. K. Que, Cunfeng Wei, T. Hu, C. X. Yu, X. Y. Shen, N. D. Qi, J. W. Zhang, C. M. Yang, Chun-Hua Jiang, X. M. Xia, Z. W. Chai, Z. Q. Yu, M. G. Zhao, J. H. Liu, Xingzhu Cui, Z. T. Yu, J. Nie, Y. Y. Shao, C. S. Gao, Jinxing Zheng, J. C. Chen, Q. M. Zhu, Miao He, J. Fang, L. S. Zheng, M. Z. Wang, S. W. Ye, H. S. Sun, X. N. Li, L. P. Zhou, F. Wang, D. M. Xi, J. Yan, Z. P. Mao, J. Y. Zhang, D. X. Zhao, B. Y. Zhang, Y. Y. Zhang, Y. Y. Wang, S. Z. Ye, S. T. Xue, G. Y. Hu, H. Z. Shi, X. F. Song, L. Z. Wang, W. G. Li, H. M. Liu, J. P. Liu, P. P. Xie, P. Q. Li, X. L. Fan, J. W. Zhao, G. P. Chen, W. D. Li, Jun Wang, Y. Q. Chen, X. H. Li, J. Y. Lu, Y. B. Liu, J. L. Hu, and Y. G. Wu

Subjects
Nuclear physics, Physics, Structure analysis, Electron–positron annihilation, Radiative decay, General Physics and Astronomy
Published
1996
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15. Studies ofξ(2230) inJ/ψRadiative Decays

Author

J. Z. Bai, G. P. Chen, H. F. Chen, S. J. Chen, S. M. Chen, Y. Chen, Y. B. Chen, Y. Q. Chen, B. S. Cheng, X. Z. Cui, H. L. Ding, W. Y. Ding, Z. Z. Du, X. L. Fan, J. Fang, C. S. Gao, M. L. Gao, S. Q. Gao, J. H. Gu, S. D. Gu, W. X. Gu, Y. F. Gu, Y. N. Guo, S. W. Han, Y. Han, J. He, M. He, G. Y. Hu, T. Hu, X. Q. Hu, D. Q. Huang, T. Huang, Y. Z. Huang, C. H. Jiang, S. Jin, Y. Jin, S. H. Kang, Z. J. Ke, Y. F. Lai, H. B. Lan, P. F. Lang, F. Li, J. Li, P. Q. Li, Q. Li, R. B. Li, W. Li, W. D. Li, W. G. Li, X. H. Li, X. N. Li, S. Z. Lin, H. M. Liu, J. Liu, J. H. Liu, Q. Liu, R. G. Liu, Y. Liu, Z. A. Liu, J. G. Lu, J. Y. Lu, S. Q. Luo, Y. Luo, A. M. Ma, E. C. Ma, J. M. Ma, H. S. Mao, Z. P. Mao, X. C. Meng, H. L. Ni, J. Nie, N. D. Qi, Y. K. Que, G. Rong, Y. Y. Shao, B. W. Shen, D. L. Shen, H. Shen, X. Y. Shen, H. Y. Sheng, H. Z. Shi, X. F. Song, F. Sun, H. S. Sun, S. J. Sun, Y. P. Tan, S. Q. Tang, G. L. Tong, F. Wang, L. S. Wang, L. Z. Wang, M. Wang, P. Wang, P. L. Wang, S. M. Wang, T. J. Wang, Y. Y. Wang, C. L. Wei, D. M. Xi, X. M. Xia, P. P. Xie, Y. G. Xie, W. J. Xiong, D. Z. Xu, R. S. Xu, Z. Q. Xu, S. T. Xue, J. Yan, W. G. Yan, C. M. Yang, C. Y. Yang, J. Yang, W. Yang, M. H. Ye, S. W. Ye, S. Z. Ye, C. S. Yu, C. X. Yu, Z. Q. Yu, Z. T. Yu, C. Z. Yuan, B. Y. Zhang, C. C. Zhang, D. H. Zhang, H. L. Zhang, J. Zhang, J. W. Zhang, L. Zhang, L. S. Zhang, S. Q. Zhang, X. Y. Zhang, Y. Zhang, Y. Y. Zhang, D. X. Zhao, H. W. Zhao, J. W. Zhao, M. Zhao, P. D. Zhao, W. R. Zhao, J. P. Zheng, L. S. Zheng, Z. P. Zheng, G. P. Zhou, H. S. Zhou, Li Zhou, X. F. Zhou, Y. H. Zhou, Q. M. Zhu, Y. C. Zhu, Y. S. Zhu, and B. A. Zhuang

Subjects
Physics, Particle physics, Glueball, Radiative transfer, General Physics and Astronomy
Abstract

The BES experiment at the Beijing electron-positron collider has observed the $\ensuremath{\xi}$(2230) signal in ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, ${K}^{+}{K}^{\ensuremath{-}}$, ${K}_{S}^{0}{K}_{S}^{0}$, and $p\overline{p}$ final states with $4.6\ensuremath{\sigma}$, $4.1\ensuremath{\sigma}$, $4.0\ensuremath{\sigma}$, and $3.8\ensuremath{\sigma}$ statistical significances, respectively. The new observations of two nonstrange decay modes of $\ensuremath{\xi}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and $p\overline{p}$ are important evidence for the glueball interpretation of the $\ensuremath{\xi}(2230)$.

Published
1996
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16. Direct measurement of theDsbranching fraction to φπ

Author

Z. P. Zheng, C. C. Zhang, D. Paluselli, G. L. Tong, B. A. Zhuang, Xingzhu Cui, E. Torrence, H. Shen, J. C. Chen, Xuanhong Lou, R. Malchow, H. S. Mao, S. D. Gu, Q. Liu, J. Panetta, Y. P. Tan, S. M. Wang, S. M. Chen, B. S. Cheng, X. C. Meng, J. Standifird, A. J. S. Smith, A. Breakstone, Y. S. Zhu, Y. C. Zhu, J. Fang, L. S. Zheng, Jun-Bing Ma, J. Synodinos, R. B. Li, D. Q. Huang, J. W. Zhang, H. L. Ding, Z. Q. Xu, J. H. Gu, J. Quigley, P. Gratton, P. L. Wang, X. F. Zhou, J. Schultz, S. J. Chen, X. M. Xia, D. X. Zhao, B. Y. Zhang, G. Zioulas, Pihong Zhao, W. X. Zhao, Y. Y. Wang, X. L. Fan, D. P. Stoker, W. X. Gu, S. Q. Tang, W. Dunwoodie, W. H. Toki, W. G. Li, M. L. Gao, M. G. Zhao, W. J. Wisniewski, S. H. Kang, I. Blum, O. Bardon, E. Soderstrom, J. C. Li, M. Mandelkern, C. Z. Yuan, Q. J. Li, Wei Li, D. Z. Xu, Y. Jin, H. Y. Sheng, S. Whittaker, C. M. Yang, W. X. Gao, R. Cowan, J. G. Lu, L. J. Pan, F. A. Harris, L. Jones, H. C. Cui, Y. H. Zhou, Y. B. Chen, H. B. Lan, C. X. Yu, Jiang Changhui, H. M. Liu, R. G. Liu, G. P. Zhou, Y. F. Lai, R. S. Xu, H. Z. Shi, S. Q. Gao, N. D. Qi, R. K. Yamamoto, R. J. Wilson, H. F. Chen, W. F. Wang, B. Schmid, T. Hu, J. Y. Zhang, X. F. Song, Y. K. Que, Q. M. Zhu, P. Wang, P. F. Lang, F. Li, Li Zhou, Z. Z. Du, B. K. Kim, L. S. Wang, M. H. Ye, J. W. Zhao, Y. Y. Zhang, M. H. Kelsey, S. J. Sun, D. G. Hitlin, X. Q. Li, Y. Z. Huang, L. Z. Wang, M. Z. Wang, K. R. He, H. S. Sun, J. Oyang, X. Q. Hu, X. N. Li, H. L. Ni, C. Y. Yang, D. M. Xi, S. Z. Ye, J. Yan, M. Hatanaka, Y. F. Gu, J. H. Liu, W. G. Yan, X. R. Shi, Michael Schernau, W. Yang, M. He, D. L. Shen, J. Nie, Z. A. Liu, F. C. Porter, H. B. Yao, S. T. Xue, Y. Y. Shao, F. Sun, C. S. Gao, G. Y. Hu, Jinxing Zheng, Lei Zhang, J. Z. Bai, D. H. Zhang, G. P. Chen, Joseph Izen, T. J. Wang, W. D. Li, S. L. Olsen, C. S. Yu, G. Rong, P. P. Xie, E. Prabhakar, B. Lowery, A. J. Lankford, S. W. Han, P. Q. Li, A. M. Ma, H. S. Zhou, X. Y. Shen, Y. N. Guo, Y. L. Han, E. C. Ma, H. L. Zhang, Y. Q. Chen, Z. Q. Yu, S. Z. Lin, W. R. Zhao, Q. P. Jia, Y. Zhang, H. B. Hu, Y. B. Liu, S. Q. Zhang, Michael J. Fero, J. He, T. H. Burnett, F. Wang, and Z. P. Mao

Subjects
Nuclear physics, Physics, Particle physics, Pion, Pair production, Meson, law, Branching fraction, Electron–positron annihilation, Yield (chemistry), Pi, Collider, law.invention
Abstract

The Beijing Spectrometer (BES) Collaboration has observed exclusive pair production of D_s mesons at the Beijing Electron-Positron Collider (BEPC) at a center-of-mass energy of 4.03 GeV. The D_s mesons are detected in the φπ^+, K¯^(*0)K^+, and K¯^0K^+ decay modes; two fully reconstructed events yield the value (3.9_(-1.9-1.1)^(+5.1+1.8))% for the D_s branching fraction to φπ. This is the first direct, model-independent measurement of this quantity.

Published
1995
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17. A measurement of decay widths

Author

H. S. Mao, Z. D. Cheng, W. H. Zhao, S. Q. Tang, B. S. Cheng, Y. P. Tan, S. M. Wang, S. D. Gu, Y. B. Liu, J. H. Gu, P. Wang, J. H. Liu, W. Yang, X. C. Meng, Pihong Zhao, W. X. Gu, H. Y. Sheng, H. L. Ding, T. J. Wang, Y. Z. Huang, J. Nie, C. X. Yu, S. H. Kang, H. Shen, C. Z. Yuan, Ya-Nan Guo, S. M. Chen, Y. C. Zhu, Y. Y. Shao, Wei Li, P. L. Wang, X. F. Zhou, Z. Q. Yu, S. T. Xue, C. S. Gao, H. P. Hu, N. D. Qi, Jinxing Zheng, L. J. Pan, R. S. Xu, Y. S. Zhu, G. Y. Hu, Z. A. Liu, Y. G. Xie, Y. K. Que, J. Y. Zhang, Q. Liu, Y. Q. Chen, X. Y. Shen, G. P. Zhou, X. X. Xie, Y. B. Chen, Q. M. Zhu, F. Li, H. L. Ni, M. Z. Wang, R. B. Li, L. S. Wang, Cunfeng Wei, Y. Y. Zhang, M. H. Ye, H. S. Sun, X. N. Li, K. R. He, S. W. Han, J. Z. Bai, P. F. Lang, Y. N. Guo, W. Z. Fang, D. X. Zhao, B. Y. Zhang, H. B. Lan, W. G. Li, J. W. Zhang, Y. L. Han, Y. Y. Wang, Jiang Changhui, S. Z. Ye, Z. Z. Du, H. M. Liu, D. Z. Xu, A. M. Ma, H. S. Zhou, Q. Y. Li, J. He, J. Fang, L. S. Zheng, X. Y. Zhang, R. G. Liu, L. P. Zhou, Z. P. Mao, P. P. Xie, D. H. Ma, P. Q. Li, M. G. Zhao, Y. Jin, S. Q. Luo, S. Q. Zhang, G. P. Chen, Xingzhu Cui, F. Sun, C. M. Yang, W. X. Gao, W. D. Li, S. Q. Gao, Z. J. Ke, X. L. Fan, Z. P. Zheng, J. W. Zhao, W. G. Yan, Lei Zhang, G. Rong, Bing Zhou, S. Z. Lin, W. R. Zhao, X. Q. Hu, D. M. Xi, J. Yan, Y. F. Gu, G. L. Tong, M. He, B. A. Zhuang, Y. Zhang, D. L. Shen, M. L. Gao, J. C. Li, S. J. Chen, Y. F. Lai, H. F. Chen, J. G. Lu, Y. H. Zhou, T. Hu, X. M. Xia, D. Q. Huang, C. C. Zhang, S. Jin, Z. Q. Xu, Jun-Bing Ma, H. C. Cui, H. Z. Shi, D. H. Zhang, C. S. Yu, X. F. Song, E. C. Ma, H. L. Zhang, L. Z. Wang, Q. M. Li, B. W. Shen, W. Y. Ding, and C. Y. Yang

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Muon, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, Hadron, Detector, High Energy Physics::Experiment, Electron, Atomic physics, Resonance (particle physics)
Abstract

The cross sections for e+e− → hadrons, e+e−, μ+μ− have been measured in the vicinity of the J Ψ resonance using the BES detector operated at BEPC. The partial widths for J Ψ to hadrons, electrons, muons and the total width have been determined to be Γh = 74.1 ± 8.1 keV, Γe = 5.14 ± 0.39 keV, Γμ = 5.13 ± 0.52 keV, and Γ = 84.4 ± 8.9 keV, respectively.

Published
1995
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18. The BES detector

Author

R. G. Liu, Z. Z. Du, Wei Li, Z.Q. Chen, Xi Wang, S. M. Wang, Junguang Lu, S. W. Han, R. S. Xu, H. S. Zhou, Y. K. Que, Li Zhou, B.Z. Dong, J. Shen, G. Rong, H. L. Ding, C. H. Jiang, R. B. Li, Yao Zhang, C. Q. Feng, Jia Li, X. M. Xia, X. Liu, Jin Li, C.S. Yu, Z.Q. Zhao, Z.D. Nie, Min Zhou, Lei Li, Hongming Zhang, G.Y. Wang, H. C. Cui, C. L. Wei, H. Z. Shi, D. X. Zhao, B. Y. Zhang, Y. Y. Wang, Y.H. Qu, Z.Y. Liu, J.G. Wang, Z. P. Zheng, B. A. Zhuang, W.H. Tian, G.S. Zhu, D. H. Ma, Jing Zhou, Lin Zhou, X.J. Hou, Zhen-An Liu, L. J. Pan, Q. P. Jia, Ming-Han Ye, Xuan Yang, S. D. Gu, G. P. Zhou, X. C. Meng, H. S. Mao, H. L. Ni, J. Xiao, Y. Q. Chen, X. F. Song, G.P. Zhong, Guo-Ming Chen, S. Z. Lin, W. R. Zhao, Y. N. Gao, Y.Z. Guan, T. J. Wang, Ya-Nan Guo, W.D. Lu, L. S. Zheng, S. Q. Tang, C.Y. Zhang, Q. M. Li, M. L. Gao, P. L. Wang, J.S. Hu, Hui Li, C.G. Lu, B. W. Shen, Yue-Hua Zhou, X.R. Yang, J. Z. Bai, D. M. Xi, Pihong Zhao, M. Zheng, P. P. Zhao, Y. S. Zhu, W. X. Gu, J. Yan, W. Liu, Y. H. Zhou, Z.Y. Lu, Y. F. Lai, Shao-Min Chen, F.C. Lin, W.P. Niu, E. C. Ma, Dehong Zhang, X. Z. Cui, W. G. Yan, C. M. Yang, S.P. Yan, W. X. Gao, S.Q. Li, Y. Z. Huang, H. L. Zhang, S.G. Zhu, Z.Z. Wei, Chunmei Zhang, Q. Ju, M. Wang, H. Y. Sheng, L. S. Wang, Y. Y. Zhang, Z. Q. Yu, Shun-Qi Zhang, M. He, D. L. Shen, J.W. Wu, X. Du, W.S. Zheng, N. D. Qi, Chen-Hua Yu, Lei Zhang, K. R. He, J. Zhao, Willis Lin, D. Q. Huang, T.Z. Ruan, M. G. Zhao, J.J. Qian, Ping Wang, C.Z. Yang, S. T. Xue, P. F. Lang, G. Y. Hu, S. Q. Gao, J. W. Zhang, J.P. Sheng, Y.W. Deng, Zirui Wang, Siguang Wang, F.K. Tang, Qian Liu, Zhe Wang, S.Q. Wu, B.C. Xuan, J. M. Ma, Q. Bian, Y. L. Han, L.J. Chen, Yue-Yuan Zhang, X.S. Dong, Xiao-Xi Xie, Jianping Zheng, Lu Wang, W. Hao, C. Y. Yang, Z.D. Wu, F. Y. Li, Geoffrey Zhang, S.H. Wu, Z. Feng, Y. N. Guo, J.Y. Wang, P. P. Xie, G.N. Liang, J.W. Hu, P. Q. Li, J. He, W. G. Li, J.G. Xu, W.M. Wu, F. Wang, Y. C. Zhu, Z. P. Mao, J. Nie, Z.X. Li, Chang-Chun Zhang, Y. Y. Shao, C. S. Gao, Z.S. Fu, Y.K. Chi, H.F. Guo, Q. M. Zhu, S.S. Deng, H. S. Sun, Z. Q. Xu, Z. G. Zhao, Xin Wu, and D. Li

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Spectrometer, Physics::Instrumentation and Detectors, Electron–positron annihilation, Detector, Particle identification, Charged particle, law.invention, Nuclear physics, Positron, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Center of mass, Collider, Instrumentation
Abstract

The Beijing Spectrometer (BES) is a general purpose solenoidal detector at the Beijing Electron Positron Collider (BEPC). It is designed to study exclusive final states in e + e − annihilations at the center of mass energy from 3.0 to 5.6 GeV. This requires large solid angle coverage combined with good charged particle momentum resolution, good particle identification and high photon detection efficiency at low energies. In this paper we describe the construction and the performance of BES detector.

Published
1994
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19. Influence of nitrogenizing and Al-doping on microstructures and thermoelectric properties of iron disilicide materials

Author

Haiyan Chen, Y. F. Lu, Xinbing Zhao, Tiejun Zhu, Eckhard Müller, H. L. Ni, and A. Mrotzek

Subjects
Silicides, Materials science, Rapid solidification processing, Silicon, Annealing (metallurgy), Mechanical Engineering, Metallurgy, Doping, Metals and Alloys, chemistry.chemical_element, General Chemistry, Thermoelectric materials, various, Thermal conductivity, chemistry, Mechanics of Materials, Aluminium, Thermoelectric properties, Seebeck coefficient, Thermoelectric effect, Materials Chemistry, Composite material
Abstract

Aluminium doped iron disilicide based thermoelectric materials FeAlxSi2 (x=0.05, 0.10) were prepared by rapid solidification, nitrogenizing treatment and hot uniaxial pressing. β-FeSi2 phase with dispersed silicon have been obtained for all the hot-pressed samples after annealing at 1073 K for 20 h. The Seebeck coefficient α, electrical conductivity σ and thermal conductivity κ were measured from room temperature to 973 K. It was found that the Seebeck coefficients were markedly enhanced by the nitrogenizing treatment, but they decreased with increasing aluminium concentration x. The nitrogenizing treatment also significantly decreased the thermal conductivities of the Al-doped samples, especially for the sample with higher aluminium concentration. The maximum figure of merit of Z=1.55×10−4 K−1 at 743 K was obtained for FeAl0.05Si2 without nitrogenizing. It is concluded that nitrogenizing treatment is promising to improve the thermoelectric properties for more heavily Al-doped FeSi2.

Published
2005

20. Measurement of the mass of the τ lepton

Author

J. Z. Bai, O. Bardon, R. A. Becker-Szendy, I. Blum, A. Breakstone, T. Burnett, G. P. Chen, H. F. Chen, J. Chen, S. J. Chen, S. M. Chen, Y. Chen, Y. B. Chen, Y. Q. Chen, B. S. Cheng, R. F. Cowan, H. C. Cui, X. Z. Cui, H. L. Ding, Z. Z. Du, W. Dunwoodie, X. L. Fan, J. Fang, C. S. Gao, M. L. Gao, S. Q. Gao, W. X. Gao, P. Gratton, J. H. Gu, S. D. Gu, W. X. Gu, Y. F. Gu, Y. N. Guo, S. W. Han, Y. Han, F. A. Harris, M. Hatanaka, J. He, K. R. He, M. He, D. G. Hitlin, G. Y. Hu, T. Hu, X. Q. Hu, D. Q. Huang, Y. Z. Huang, J. M. Izen, Q. P. Jia, C. H. Jiang, Z. Z. Jiang, S. Jin, Y. Jin, L. Jones, S. H. Kang, Z. J. Ke, M. H. Kelsey, B. K. Kim, Y. F. Lai, H. B. Lan, P. F. Lang, A. Lankford, F. Li, J. Li, P. Q. Li, Q. Li, R. B. Li, W. Li, W. D. Li, W. G. Li, X. H. Li, X. N. Li, Y. S. Li, S. Z. Lin, H. M. Liu, J. Liu, J. H. Liu, Q. Liu, R. G. Liu, Y. Liu, Z. A. Liu, X. C. Lou, B. Lowery, F. Lu, J. G. Lu, Y. Luo, A. M. Ma, D. H. Ma, E. C. Ma, J. M. Ma, H. S. Mao, Z. P. Mao, R. Malchow, M. Mandelkern, H. Marsiske, X. C. Meng, H. L. Ni, J. Nie, S. L. Olsen, J. Oyang, D. Paluselli, L. J. Pan, J. Panetta, F. Porter, E. Prabhakar, N. D. Qi, Y. K. Que, J. Quigley, G. Rong, M. Schernau, B. Schmid, J. Schultz, Y. Y. Shao, B. W. Shen, D. L. Shen, H. Shen, X. Y. Shen, H. Y. Sheng, H. Z. Shi, X. R. Shi, A. Smith, E. Soderstrom, X. F. Song, J. Standifird, D. Stoker, F. Sun, H. S. Sun, S. J. Sun, J. Synodinos, Y. P. Tan, S. Q. Tang, W. Toki, G. L. Tong, E. Torrence, F. Wang, L. S. Wang, L. Z. Wang, M. Wang, P. Wang, P. L. Wang, S. M. Wang, T. J. Wang, Y. Y. Wang, C. L. Wei, S. Whittaker, R. Wilson, W. J. Wisniewski, Y. G. Wu, D. M. Xi, X. M. Xia, P. P. Xie, X. X. Xie, W. J. Xiong, D. Z. Xu, M. K. Xu, R. S. Xu, Y. D. Xu, Z. Q. Xu, S. T. Xue, R. Yamamoto, J. Yan, W. G. Yan, C. M. Yang, C. Y. Yang, J. Yang, W. Yang, H. B. Yao, M. H. Ye, S. W. Ye, S. Z. Ye, C. S. Yu, C. X. Yu, Y. H. Yu, Z. Q. Yu, C. Z. Yuan, J. Y. Zeng, B. Y. Zhang, C. C. Zhang, D. H. Zhang, H. L. Zhang, J. Zhang, J. W. Zhang, L. S. Zhang, S. Q. Zhang, Y. Zhang, Y. Y. Zhang, D. X. Zhao, H. W. Zhao, J. W. Zhao, M. Zhao, P. D. Zhao, W. R. Zhao, J. P. Zheng, L. S. Zheng, Z. P. Zheng, G. P. Zhou, H. S. Zhou, Li Zhou, X. F. Zhou, Y. H. Zhou, H. G. Zhu, Q. M. Zhu, Y. C. Zhu, Y. S. Zhu, B. A. Zhuang, and G. Zioulas

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Muon, Spectrometer, Branching fraction, Maximum likelihood, Electron–positron annihilation, General Physics and Astronomy, Elementary particle, State (functional analysis), Mass measurement, law.invention, Particle decay, Pair production, law, High Energy Physics::Experiment, Collider, Energy (signal processing), Lepton
Abstract

The mass of the \ensuremath{\tau} lepton has been measured at the Beijing Electron-Positron Collider using the Beijing Spectrometer. A search near threshold for ${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\rightarrow}${\mathrm{\ensuremath{\tau}}}^{+}$${\mathrm{\ensuremath{\tau}}}^{\mathrm{\ensuremath{-}}}$ was performed. Candidate events were identified by requiring that one \ensuremath{\tau} decay via \ensuremath{\tau}\ensuremath{\rightarrow}e\ensuremath{\nu}\ensuremath{\nu}\ifmmode\bar\else\textasciimacron\fi{}, and the other via \ensuremath{\tau}\ensuremath{\rightarrow}\ensuremath{\mu}\ensuremath{\nu}\ensuremath{\nu}\ifmmode\bar\else\textasciimacron\fi{}. The mass value, obtained from a fit to the energy dependence of the ${\mathrm{\ensuremath{\tau}}}^{+}$${\mathrm{\ensuremath{\tau}}}^{\mathrm{\ensuremath{-}}}$ cross section, is ${\mathit{m}}_{\mathrm{\ensuremath{\tau}}}$=1776.${9}_{\mathrm{\ensuremath{-}}0.5}^{+0.4}$\ifmmode\pm\else\textpm\fi{}0.2 MeV.

Published
1996

21. Direct Measurement of the Pseudoscalar Decay Constant, f_D_s

Author

J. Z. Bai, O. Bardon, I. Blum, A. Breakstone, T. Burnett, G. P. Chen, H. F. Chen, J. Chen, S. J. Chen, S. M. Chen, Y. Chen, Y. B. Chen, Y. Q. Chen, B. S. Cheng, R. F. Cowan, H. C. Cui, X. Z. Cui, H. L. Ding, Z. Z. Du, W. Dunwoodie, X. L. Fan, J. Fang, M. Fero, C. S. Gao, M. L. Gao, S. Q. Gao, W. X. Gao, P. Gratton, J. H. Gu, S. D. Gu, W. X. Gu, Y. F. Gu, Y. N. Guo, S. W. Han, Y. Han, F. A. Harris, M. Hatanaka, J. He, K. R. He, M. He, D. G. Hitlin, G. Y. Hu, H. B. Hu, T. Hu, X. Q. Hu, D. Q. Huang, Y. Z. Huang, J. M. Izen, Q. P. Jia, C. H. Jiang, Y. Jin, L. Jones, S. H. Kang, M. H. Kelsey, B. K. Kim, Y. F. Lai, H. B. Lan, P. F. Lang, A. Lankford, F. Li, J. Li, P. Q. Li, Q. Li, R. B. Li, W. Li, W. D. Li, W. G. Li, X. Li, X. N. Li, S. Z. Lin, H. M. Liu, J. H. Liu, Q. Liu, R. G. Liu, Y. Liu, Z. A. Liu, X. C. Lou, B. Lowery, J. G. Lu, A. M. Ma, E. C. Ma, J. M. Ma, H. S. Mao, Z. P. Mao, R. Malchow, M. Mandelkern, X. C. Meng, H. L. Ni, J. Nie, S. L. Olsen, J. Oyang, D. Paluselli, L. J. Pan, J. Panetta, F. Porter, E. Prabhakar, N. D. Qi, Y. K. Que, J. Quigley, G. Rong, M. Schernau, B. Schmid, J. Schultz, Y. Y. Shao, D. L. Shen, H. Shen, X. Y. Shen, H. Y. Sheng, H. Z. Shi, X. R. Shi, A. Smith, E. Soderstrom, X. F. Song, J. Standifird, D. Stoker, F. Sun, H. S. Sun, S. J. Sun, J. Synodinos, Y. P. Tan, S. Q. Tang, W. Toki, G. L. Tong, E. Torrence, F. Wang, L. S. Wang, L. Z. Wang, M. Wang, P. Wang, P. L. Wang, S. M. Wang, T. J. Wang, W. Wang, Y. Y. Wang, S. Whittaker, R. Wilson, W. J. Wisniewski, D. M. Xi, X. M. Xia, P. P. Xie, D. Z. Xu, R. S. Xu, Z. Q. Xu, S. T. Xue, R. Yamamoto, J. Yan, W. G. Yan, C. M. Yang, C. Y. Yang, W. Yang, H. B. Yao, M. H. Ye, S. Z. Ye, C. S. Yu, C. X. Yu, Z. Q. Yu, C. Z. Yuan, B. Y. Zhang, C. C. Zhang, D. H. Zhang, H. L. Zhang, J. Zhang, J. W. Zhang, L. S. Zhang, S. Q. Zhang, Y. Zhang, Y. Y. Zhang, D. X. Zhao, J. W. Zhao, M. Zhao, P. D. Zhao, W. R. Zhao, W. X. Zhao, J. P. Zheng, L. S. Zheng, Z. P. Zheng, G. P. Zhou, H. S. Zhou, Li Zhou, X. F. Zhou, Y. H. Zhou, Q. M. Zhu, Y. C. Zhu, Y. S. Zhu, B. A. Zhuang, and G. Zioulas

Subjects
Pseudoscalar, Physics, Nuclear physics, Particle physics, Meson, Branching fraction, Electron–positron annihilation, General Physics and Astronomy, Exponential decay
Abstract

The Beijing Spectrometer (BES) experiment has observed purely leptonic decays of the D_s meson in the reaction e^+e^-→D_s^+D_s^- at a c.m. energy of 4.03 GeV. Three events are observed in which one D_s decays hadronically to φπ, K̅ ^(*0)K, or K̅^0K, and the other decays leptonically to μν_μ or τν_τ. With the assumption of μ-τ universality, values of the branching fraction, B(D_s→μν_μ) = (1.5_(-0.6-0.2)^(+1.3+0.3))%, and the D_s pseudoscalar decay constant, f_D_s = (4.3_(-1.3-0.4)^(+1.5+0.4))×10^2 MeV, are obtained.

Published
1995

22. Erratum: Search for a vector glueball by a scan of theJ/ψresonance [Phys. Rev. D 54, 1221 (1996)]

Author

J. Panetta, S. M. Chen, Y. C. Zhu, A. Breakstone, P. L. Wang, X. F. Zhou, G. P. Chen, H. S. Mao, W. D. Li, J. Synodinos, P. Gratton, Z. Q. Xu, X. M. Xia, B. S. Cheng, F. A. Harris, L. Jones, H. W. Zhao, Z. P. Zheng, X. C. Meng, P. Wang, J. Standifird, R. S. Xu, W. Dunwoodie, J. H. Gu, S. Jin, J. He, X. Q. Hu, Y. F. Gu, D. Kong, J. Schultz, G. L. Tong, M. H. Kelsey, F. Li, H. L. Ni, D. P. Stoker, A. J. S. Smith, D. L. Shen, W. J. Xiong, Y. P. Tan, B. A. Zhuang, C. Y. Yang, O. Bardon, S. M. Wang, S. Q. Tang, R. B. Li, X. L. Fan, E. Soderstrom, J. G. Lu, R. Cowan, Q. J. Li, Wei Li, S. W. Ye, Z. Q. Yu, Y. H. Zhou, R. J. Wilson, P. F. Lang, H. Y. Sheng, L. J. Pan, J. C. Li, J. W. Zhao, S. D. Gu, Y. S. Zhu, J. Oyang, C. X. Yu, X. K. Que, T. Hu, H. L. Ding, D. Paluselli, N. D. Qi, Y. B. Chen, C. M. Yang, Q. Liu, Z. A. Liu, S. Q. Gao, Z. J. Ke, M. L. Gao, B. K. Kim, H. B. Lan, E. Torrence, T. H. Burnett, Pihong Zhao, D. G. Hitlin, D. X. Zhao, B. Y. Zhang, Jiming Yang, W. J. Wisniewski, W. X. Gu, S. Q. Zhang, D. Z. Xu, L. S. Wang, M. H. Ye, Miao He, J. C. Chen, Xuanhong Lou, T. J. Wang, W. H. Toki, Y. Y. Wang, R. Malchow, L. P. Zhou, R. G. Liu, G. P. Zhou, Jun-Bing Ma, C. C. Zhang, S. H. Kang, M. Mandelkern, C. Z. Yuan, B. Schmid, J. Fang, L. S. Zheng, S. Z. Ye, M. Hatanaka, Y. F. Lai, H. F. Chen, X. Y. Shen, S. T. Xue, H. Shen, M. G. Zhao, K. K. Young, J. Z. Bai, G. Y. Hu, Cunfeng Wei, J. Y. Zhang, J. W. Zhang, P. P. Xie, Y. Y. Zhang, Z. Z. Du, S. J. Sun, S. L. Olsen, B. W. Shen, D. Q. Huang, H. Z. Shi, X. F. Song, L. Z. Wang, P. Q. Li, W. G. Li, S. Z. Lin, W. R. Zhao, Y. Zhang, H. M. Liu, Michael J. Fero, J. P. Liu, F. Sun, J. Quigley, Y. Luo, G. Zioulas, Chun-Hua Jiang, S. Whittaker, R. K. Yamamoto, D. H. Zhang, C. S. Yu, E. C. Ma, H. L. Zhang, E. Prabhakar, D. M. Xi, A. J. Lankford, J. Yan, W. G. Yan, Lei Zhang, Joseph Izen, G. Rong, Q. P. Jia, I. Blum, Y. Jin, Y. Z. Huang, Y. B. Liu, F. C. Porter, X. R. Shi, Y. N. Guo, Y. L. Han, Y. Q. Chen, S. W. Han, A. M. Ma, H. S. Zhou, X. H. Li, S. Q. Luo, J. H. Liu, Michael Schernau, W. Yang, J. Nie, F. Wang, Z. P. Mao, Y. Y. Shao, C. S. Gao, Jinxing Zheng, B. Lowery, Q. M. Zhu, M. Z. Wang, H. S. Sun, X. N. Li, and Xingzhu Cui

Subjects
Physics, Nuclear and High Energy Physics, Glueball, Quantum mechanics, Quantum electrodynamics, Resonance (particle physics)
Published
1998
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23. Occupational contact dermatitis in manufacture of vanillin

Author

X S, Wang, Y S, Xue, Y, Jiang, H L, Ni, H, Zhu, B G, Luo, and S Q, Luo

Subjects
Flavoring Agents, Male, Chemistry, Chemical Phenomena, Dermatitis, Occupational, Benzaldehydes, Guinea Pigs, Animals, Humans, Female, Patch Tests, Dermatitis, Contact
Published
1987

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