Search

Your search keyword '"W. X. Gao"' showing total 33 results
Start Over Author "W. X. Gao"
33 results on '"W. X. Gao"'

3. 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

4. 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

7. Determination of CC slab solidification using nail shooting technique

Author

Z W Han, W X Gao, Dengfu Chen, Qiang Liu, Mujun Long, Qiangqiang Wang, and D H Luo

Subjects
Materials science, Mechanical Engineering, Metallurgy, Metals and Alloys, Shell (structure), Continuous casting, Transverse plane, Mechanics of Materials, Casting (metalworking), Materials Chemistry, Nail (fastener), Slab, Point (geometry), Composite material, Water spray
Abstract

The technology of nail shooting was improved and used to study the transverse shape of the solidified shell during steel continuous casting. Three locations across the slab width (1/2, 1/4 and 1/8) were measured by nail shooting and which indicated a larger solidification coefficient and longer liquid core in the slab at higher casting speeds. The solidified shell across the slab width direction was non-uniform due to uneven secondary spray cooling. The point of final solidification at locations 1/8 and 1/4 was much longer than the position between the slab centre and location 1/4, leading to a long solidification end of >2 m, which is poor for the application of dynamic soft reduction. A mathematical model was developed to simulate the growth of the solidified shell and which was in good agreement with the measurements measured by nail shooting. Based on the measurements and simulations, the water spray pattern was improved, making the solidified shell more uniform. Dynamic soft reduction was the...

Published
2012

8. Study on performances of heating system with solar hybrid air source heat pump in winter

Author

Q Wang, L Yang, W Y Zhou, W X Gao, and Yaran Wang

Subjects
Heating system, Nuclear engineering, Air source heat pumps, Time schedule, Heat supply, Environmental science, Astrophysics::Earth and Planetary Astrophysics, Radiation, Hot water supply
Abstract

Taking Tianjin as an example, a time schedule for household hot water supply was set up. By simulating hot water supply and space heating in 24 hours, running performances of the system, hybrid by solar and air source heat pump, were studied under the unfavorable heat supply conditions in the month with minimum solar radiation. The interaction between the performances of hot water supply and space heating was analyzed.

Published
2018

9. Small polaron effect on carrier recombination in perovskite manganite thin films

Author

G.-R Wu, G.C. Xiong, W.-X Gao, Hiroshi Negishi, Misao Sasaki, M. Inoue, and T Isa

Subjects
Paramagnetism, Effective mass (solid-state physics), Condensed matter physics, Ferromagnetism, Chemistry, Thermoelectric effect, Materials Chemistry, General Chemistry, Electron hole, Condensed Matter Physics, Polaron, Manganite, Perovskite (structure)
Abstract

Photoinduced ‘transient thermoelectric effect (TTE)’ in perovskite manganite La 0.6 Ca 0.4 MnO 3 thin film has been measured under magnetic fields. The fast decay process of TTE signals is due to a recombination of photogenerated electron–hole pairs through Mn 4+ ions as capture centers, whose evaluated cross section σ obeys the power law σ ∝ T − n ( n =0.75) in the ferromagnetic phase far below T c and in the paramagnetic phase. From the observed relaxation time τ 1 , we evaluated the parameter α characterizing a small polaron effect and the effective mass m ∗ ; both are enhanced appreciably near T c . Such anomaly is attributed to the change in the thermal velocity of diffusing holes with downspin due to a small polaron effect .

Published
2001

11. 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

12. 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

13. A determination of α in e+e− annihilation at GeV

Author

J. S. Kang, R. C. Walker, Steve Schnetzer, S. Ebara, N. Takashimizu, K. Gotow, Moo Hyun Lee, P. N. Kirk, Y. Fujii, M. H. Ye, F. Liu, Kazuo Abe, Y. Yamashita, T. Ishizuka, T. Aso, Tsunehiko Omori, David Stuart, Richard Breedon, Y. K. Li, C. A. Fry, S. Lusin, Dong-Chul Son, Ryuki Tanaka, Bj Kim, Takashi Sasaki, K. Ueno, J. Rowe, H. Miyata, Y. Takaiwa, J. Vinson, Y. Sakai, A. Bodek, M. E. Mattson, Robert Stone, A. Murakami, Seong Keun Kim, J. R. Smith, F. Kajino, W. G. Yan, W. X. Gao, D. Y. Kim, T. Thomas, S. S. Myung, C. Velisarris, Hiroyuki Sagawa, S. Matsumoto, T. Nozaki, C. Rosenfeld, A. Maki, L. Y. Zheng, K. L. Sterner, Stephen L. Olsen, M. Oyoshi, A. Abashian, Yoshimasa Kurihara, S. Kobayashi, S. Kanda, R. L. Lander, C. P. Cheng, S. Wilson, Suyong Choi, Kisoo Lee, Saroj Kumar Sahu, Kazumasa Miyano, Yasuhiro Sugimoto, Y. S. Chung, Susumu Terada, R. Poling, S. Behari, T. Kumita, K. W. Park, L. E. Piilonen, L. M. Chinitz, and Winston Ko

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Logarithm, Electron–positron annihilation, High Energy Physics::Phenomenology, Monte Carlo method, Jet (particle physics), Nuclear physics, Strong coupling, High Energy Physics::Experiment, Matrix element
Abstract

We present a study of differential two jet ratios in multi-hadronic final states produced by e(+)e(-) annihilation in the AMY detector at TRISTAN. The data are compared to the predictions of the next-to-leading logarithm parton-shower (NLL PS) Monte Carlo and the O(alpha(s)(2)) matrix element QCD models. We determine the strong coupling strength alpha(s)(57.3 GeV) = 0.130 +/- 0.006.

Published
1995

14. Fabrication of Aharonov-Bohm rings in Si/SiGe heterostructure

Author

S. Washburn, Kam-Leung Lee, J. O. Chu, W. X. Gao, and K. Ismail

Subjects
Condensed matter physics, Magnetoresistance, Chemistry, Doping, Conductance, Heterojunction, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Computer Science::Other, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Condensed Matter::Materials Science, Etching (microfabrication), Electrical and Electronic Engineering, Reactive-ion etching, Lithography, Electron-beam lithography
Abstract

A sub-micron trenching technique has been developed to fabricate Aharonov-Bohm ring structures in a high mobility Si/Si"0"."7Ge"0"."3 modulation doped heterostructure. Scanning electron-beam lithography is used to expose the area defining the ring contour, and reactive-ion etching follows to recess this area, thus forcing electrons to flow inside the ring. Conductance in the Si/SiGe rings exhibits oscillations in magnetoresistance, which is the first observation of this effect in Si-based materials. The amplitude of the oscillations is comparable to that of similar devices on similar mobility GaAs/GaAlAs heterostructures.

Published
1995

15. Tunneling between edge states in clean multiple GaAs/AlxGa1−xAs rings and increase of the phase coherence length with magnetic field

Author

J. M. Hong, Khalid EzzEldin Ismail, Jian Liu, Kim Y. Lee, Sean Washburn, and W. X. Gao

Subjects
Physics, Statistics::Theory, X-ray absorption spectroscopy, education.field_of_study, Statistics::Applications, Condensed matter physics, Oscillation, Population, Landau quantization, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Magnetic field, Amplitude, education, Quantum tunnelling, Order of magnitude
Abstract

In GaAs/${\mathrm{Al}}_{\mathit{x}}$${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$As coupled four-ring and two-ring samples, large Aharonov-Bohm (AB) oscillations have been observed for magnetic fields 0B4.5 T. The oscillation spectrum changes systematically corresponding to the subband (Landau level) population inside the one-dimensional channels. Multiple tunneling between the edge states encircling the lithographically defined islands causes well-resolved high harmonics ne/h of the fundamental Aharonov-Bohm oscillation frequency with n\ensuremath{\le}8. Such high harmonics indicate participation from several islands and require very long phase coherence lengths ${\mathit{l}}_{\mathrm{\ensuremath{\varphi}}}$. The frequencies ${\mathit{f}}_{\mathit{n}}$=ne/h of all harmonics decrease with increasing B in accord with a simple model. These findings are evidence for ballistic transport in these large complex devices. The B dependence of the quantum interference amplitudes ${\mathit{G}}_{\mathit{n}}$(B) for AB oscillations of frequency ne/h is qualitatively different from the previously published results: They increase by about an order of magnitude with increasing B before decaying at very high field. The increase in ${\mathit{G}}_{\mathit{n}}$(B) is exploited to infer ${\mathit{l}}_{\mathrm{\ensuremath{\varphi}}}$ and indicates that ${\mathit{l}}_{\mathrm{\ensuremath{\varphi}}}$(B) increases with B at a rate \ensuremath{\ge}1.3 \ensuremath{\mu}m/T.

Published
1994

16. Phase coherence and tunneling between edge-states in multiple GaAs/AlxGa#x2212;x#x2212;x#x2212;xAs rings

Author

Kim Y. Lee, J. M. Hong, Jian Liu, K. Ismail, W. X. Gao, and Sean Washburn

Subjects
Materials science, Condensed matter physics, Magnetoresistance, Heterojunction, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Magnetic field, Tunnel effect, symbols.namesake, Ballistic conduction, Harmonics, symbols, General Materials Science, Aharonov–Bohm effect, Quantum tunnelling
Abstract

In a GaAs/AlGaAs 4-coupled-ring sample, large Aharonov-Bohm (AB) oscillations were studied up to harmonic order n = 8 for magnetic fields 0 < B < 4.5T. The frequencies of all harmonics of the AB oscillations decrease as predicted by a simple model. The results also suggest an increase of the quantum mechanical phase coherence length (lφ) with increased B.

Published
1994

17. Measurements of cross section and asymmetry fore+e−→bb¯and heavy quark fragmentation at KEK TRISTAN

Author

S. K. Choi, A. Maki, L. Y. Zheng, Hiroyuki Sagawa, M. Oyoshi, Yasuhiro Sugimoto, Y. S. Chung, H. Miyata, R. L. Lander, Y. Sakai, Robert Stone, L. M. Chinitz, S. S. Myung, Bj Kim, S. Kanda, C. Velisarris, M. Shirai, Winston Ko, W. X. Gao, M. H. Ye, Kazuo Abe, J. R. Smith, F. Liu, C. P. Cheng, W. G. Yan, A. Murakami, K. Gotow, Y. Fujii, C. A. Fry, K. W. Park, Stephen L. Olsen, T. Thomas, J. Rowe, A. Bodek, R. Poling, M. E. Mattson, D. K. Cho, Yoshimasa Kurihara, L. E. Piilonen, T. Aso, M. E. Zomorrodian, David Stuart, Dong-Chul Son, K. L. Sterner, M. H. Lee, Kazumasa Miyano, K. Okubo, C. Rosenfeld, P. N. Kirk, S. Matsumoto, Y. Yamashita, Susumu Terada, Ryuki Tanaka, Y. Takaiwa, S. Wilson, Tsunehiko Omori, T. Nozaki, D. Y. Kim, R. C. Walker, A. Abashian, Steve Schnetzer, S. K. Kim, Saroj Kumar Sahu, N. Takashimizu, Takashi Sasaki, F. Kajino, K. B. Lee, Richard Breedon, K. Ueno, J. Vinson, T. Kumita, F. Sannes, Y. K. Li, S. Lusin, J. S. Kang, S. Kobayashi, S. Ebara, and T. Ishizuka

Subjects
Quark, Nuclear physics, Physics, Particle physics, Annihilation, Muon, Meson, Electron–positron annihilation, Hadron, Bottom quark, Charm quark
Abstract

Using 773 muons found in hadronic events from 142 pb-1 of data at a c.m. energy of 57.8 GeV, we extract the cross section and forward-backward charge asymmetry for the e+e- --> bbBAR process, and the heavy quark fragmentation function parameters for the Peterson model. For the analysis of the e+e- --> bbBAR process, we use a method in which the behavior of the c quark and lighter quarks is assumed, with only that of the b quark left indeterminate. The cross section and asymmetry for e+e- --> bbBAR are found to be R(b) = 0.57 +/- 0.06(stat) +/- 0.08(syst) and A(b) = -0.59 +/- 0.09 +/- 0.09, respectively. They are consistent with the standard model predictions. For the study of the fragmentation function we use the variable [x(e)], the fraction of the beam energy carried by the heavy hadrons. We obtain [x(E)]c = 0.56(-0.05-0.03)+0.04+0.03 and [x(E)]b = 0.65(-0.04-0.06)+0.06+0.05, respectively. These are in good agreement with previously measured values.

Published
1994

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

19. Forward-backward charge asymmetry of quark pairs produced at the KEK TRISTANe+e−collider

Author

K. Gotow, Y. Fujii, Stephen L. Olsen, S. S. Myung, Richard Breedon, J. S. Kang, K. L. Sterner, T. Aso, L. E. Piilonen, Yoshimasa Kurihara, K. Ueno, M. E. Mattson, F. Kajino, M. H. Lee, A. T.M. Wang, J. Vinson, S. Ebara, S. Kanda, S. Wilson, Robert Stone, D. Stuart, Kisoo Lee, C. A. Fry, P. N. Kirk, S. Kobayashi, K. W. Park, C. Velisarris, Sunghee Kim, W. X. Gao, C. Rosenfeld, T. Kumita, Y. Yamashita, C. P. Cheng, Ron Poling, Yasuhiro Sugimoto, T. Ishizuka, Winston Ko, S. K. Choi, F. Sannes, Dong-Chul Son, Hiroyuki Sagawa, T. Thomas, S. Lusin, Bj Kim, D. Haim, Y. S. Chung, J. R. Smith, Takashi Sasaki, M. Oyoshi, J. Rowe, A. Abashian, R. L. Lander, W. G. Yan, A. Maki, A. Bodek, Y. K. Li, L. Y. Zheng, Kazuo Abe, N. Morgan, Saroj Kumar Sahu, L. M. Chinitz, R. C. Walker, Steve Schnetzer, N. Takashimizu, M. H. Ye, F. Liu, Tsunehiko Omori, T. Nozaki, S. Matsumoto, H. Miyata, Y. Sakai, Kazumasa Miyano, Susumu Terada, A. Murakami, Ryuki Tanaka, and Y. Takaiwa

Subjects
Physics, Quark, Particle physics, High Energy Physics::Lattice, Electron–positron annihilation, media_common.quotation_subject, High Energy Physics::Phenomenology, Charge (physics), Jet (particle physics), Asymmetry, law.invention, Standard Model, Nuclear physics, Pair production, law, High Energy Physics::Experiment, Collider, media_common
Abstract

We report on a measurement of the forward-backward charge asymmetry in e+e- --> qqBAR at KEK TRISTAN, where. the asymmetry is near maximum. We sum over all flavors and measure the asymmetry by determining the charge of the quark jets. In addition we exploit flavor dependencies in the jet charge determination to enhance the contributions of certain flavors. This provides a check on the asymmetries of individual flavors. The measurement agrees with the standard model expectations.

Published
1994

20. Measurements of the inclusive jet cross section in photon-photon interactions at TRISTAN

Author

J. R. Smith, S. Lusin, Takashi Sasaki, Saroj Kumar Sahu, S. Behari, Dong-Chul Son, David Stuart, Bj Kim, Stephen L. Olsen, M. H. Lee, Yoshimasa Kurihara, N. Morgan, S. K. Choi, T. Nozaki, C. Velisarris, Sunghee Kim, Kisoo Lee, K. Ohkubo, T. Ishizuka, F. Kajino, A. Maki, L. Y. Zheng, A. Murakami, Robert Stone, M. Shirai, K. Gotow, M. H. Ye, Kazumasa Miyano, Y. Fujii, Kazuo Abe, S. S. Myung, A. Abashian, W. G. Yan, C. Rosenfeld, T. Aso, J. S. Kang, Richard Breedon, K. Ueno, F. Liu, S. Kobayashi, A. Bodek, P. N. Kirk, J. Vinson, M. Oyoshi, Susumu Terada, T. Kumita, W. X. Gao, F. Sannes, S. Ebara, C. P. Cheng, K. L. Sterner, D. Haim, T. Thomas, Winston Ko, Ryuki Tanaka, Y. Takaiwa, S. Kanda, D. Y. Kim, R. L. Lander, D. K. Cho, L. E. Piilonen, C. A. Fry, Y. K. Li, S. Wilson, Y. Yamashita, J. Rowe, S. Matsumoto, R. C. Walker, Steve Schnetzer, N. Takashimizu, K. W. Park, Yasuhiro Sugimoto, M. E. Mattson, Y. S. Chung, L. M. Chinitz, Hiroyuki Sagawa, Tsunehiko Omori, H. Miyata, and Y. Sakai

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Photon, High Energy Physics::Phenomenology, Detector, Physics::Optics, Parton, Jet (particle physics), Photon structure function, Nuclear physics, Cross section (physics), High Energy Physics::Experiment, Perturbation theory (quantum mechanics)
Abstract

We present cross section measurements for inclusive jet production in almost-real photon-photon interactions at TRISTAN using the AMY detector. The results are compared with leading-order QCD calculations for different parameterizations of the parton density in the photon.

Published
1994

21. [Studies of hypoxic rat brain mitochondrial transcription activity in vitro]

Author

W X, Gao, J Z, Liu, L P, Wu, and M C, Cai

Subjects
Male, Transcription, Genetic, Animals, Brain, Mitochondrial Proton-Translocating ATPases, Rats, Wistar, Hypoxia, Mitochondria, Rats
Abstract

To explore the effects of acute and chronic hypoxia on brain mitochondrial transcription activity in vitro of rats.Animal grouping: Wistar rats were randomized into acute hypoxic group (AH), chronic hypoxic group (CH) and the control. Mitochondrial transcription activity in vitro was measured in each group respectively as well as mitochondrial F0F1-ATPase activity, and effects of environmental ATP concentration on mitochondrial transcription activity in vitro was observed.Brain mitochondrial transcription activity and F0F1-ATPase activity were marked depressed in AH while partly reversed in CH, and they were linearly related. Mitochondrial transcription activity in vitro was affected by ATP concentration diphasely.Acute hypoxia may impair brain mitochondria energy metabolism by way of depressing mitochondrial transcription and then partially recover during chronic hypoxia. And mitochondrial transcription in vitro might be precisely regulated by ATP concentration.

Published
2011

22. Correlations between Aharonov-Bohm effects and one-dimensional subband populations in GaAs/AlxGa1−xAs rings

Author

Jian Liu, K. Ismail, S. Washburn, W. X. Gao, J. M. Hong, and Kim Y. Lee

Subjects
Physics, symbols.namesake, Amplitude, Magnetoresistance, Condensed matter physics, Scattering, Ballistic conduction, symbols, Trapping, Electron, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Aharonov–Bohm effect, Magnetic field
Abstract

The Aharonov-Bohm (AB) interference patterns in ring-shaped conductors are usually dominated by random features. The amplitude of the oscillations is random from sample to sample and from point to point on the magnetic field axis owing to random scattering of the electron trajectories by impurities within the wires. We report experiments on devices made wet etching and global gates, which have shown major progress towards removing the random features. In loops that exhibit ballistic conductance plateaus and cyclotron orbit trapping at 4.2 K, the random pattern of AB oscillations (observed for T

Published
1993

23. Measurement of α from the moment of particle momenta within jets from e+e- annihilation

Author

Robert Stone, David Stuart, Kisoo Lee, Kazuo Abe, A. Abashian, Sun Kee Kim, J. R. Smith, F. Sannes, T. Thomas, W. X. Gao, Kazumasa Miyano, B. J. Kim, S. Kanda, R. C. Walker, M. Oyoshi, Steve Schnetzer, Takashi Sasaki, Ko Winston, N. Takashimizu, J. Rowe, M. E. Mattson, Richard Breedon, Dong-Chul Son, L. E. Piilonen, C. Rosenfeld, A. Bodek, W. G. Yan, Yasuhiro Sugimoto, Y. S. Chung, M. H. Ye, Hiroyuki Sagawa, C. Velisarris, S. L. Olsen, R. L. Lander, S. K. Choi, K. Gotow, Y. Fujii, K. Ueno, J. Vinson, Y. K. Li, P. N. Kirk, Susumu Terada, T. Kumita, S. Wilson, D. Haim, N. Morgan, F. Liu, M. E. Zomorrodian, S. Kobayashi, Y. Yamashita, Tsunehiko Omori, Yoshimasa Kurihara, Saroj Kumar Sahu, L. M. Chinitz, C. P. Cheng, T. Nozaki, J. S. Kang, A. Murakami, T. Aso, H. Miyata, C. A. Fry, M. H. Lee, S. Ebara, Y. Sakai, K. W. Park, T. Ishizuka, R. Poling, Ryuki Tanaka, Y. Takaiwa, S. Matsumoto, A. Maki, L. Y. Zheng, F. Kajino, S. S. Myung, K. L. Sterner, and S. Lusin

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Logarithm, Electron–positron annihilation, High Energy Physics::Phenomenology, Jet (particle physics), Nuclear physics, Momentum, Moment (mathematics), Particle, High Energy Physics::Experiment
Abstract

We present a study of the third moment of the inclusive momentum distribution of particles within jets produced by e+e- annihilation at TRISTAN. In this analysis, the QCD coupling strength alpha(s) is determined by fits to the prediction of the Next-to-Leading Logarithm Parton-Shower model. The measured value of alpha(s) (57.9 GeV) = 0.134(-0.005)+0.006.

Published
1993

24. Evidence for hard scattering of hadronic constituents of photons in photon-photon collisions of TRISTAN

Author

Hiroyuki Sagawa, K. Gotow, R. L. Lander, C. Rosenfeld, S. Wilson, Richard Breedon, K. Tomioka, R. C. Walker, Steve Schnetzer, S. S. Myung, L. E. Piilonen, Y. Takaiwa, M. Frautschi, S. Matsumoto, J. Vinson, S. K. Choi, E. H. Low, A. Murakami, F. Sannes, David Stuart, S. Kanda, A. Bacala, K. P. Hu, E. Araki, A. T.M. Wang, T. Nozaki, Y. Oshi, T. Ishizuka, W. G. Yan, H. Kagan, C. P. Cheng, A. Z. Lai, Sun Kee Kim, S. L. Olsen, T. Kumita, Dong-Chul Son, Y. K. Li, C. Velisarris, J. S. Kang, P. N. Kirk, Kazuo Abe, J. Lim, Takashi Sasaki, J. R. Smith, T. Kojima, Yoshimasa Kurihara, Robert Stone, S. Lusin, Tsunehiko Omori, Y. Yamashita, K. Ueno, Yusuke Higashi, Kaori Maeshima, W. X. Gao, P. Gu, M. E. Mattson, H. Miyata, Kazumasa Miyano, C. A. Fry, R. L. Malchow, M. H. Ye, A. Sill, H. Yoshinaka, Yongsun Kim, B. J. Kim, A. Maki, R. D. Kass, Moo Hyun Lee, Winston Ko, S. Kobayashi, Susumu Terada, R. Poling, T. Thomas, D. Blanis, A. Abashian, K. L. Sterner, Rr Mcneil, F. Kajino, R. Tanaka, J. Rowe, A. Bodek, Y. Sakai, Yasuhiro Sugimoto, and Y. Fujii

Subjects
Physics, Nuclear physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Photon, Luminosity (scattering theory), Scattering, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment, Nuclear Experiment
Abstract

We present results of an experimental study of e+e−+ hadrons in the kinematic regime for which the process is interpreted as hadron production in collisions of almost-real photons. The data sample corresponds to an integrated luminosity of 27.5 pb− and covers center-of-mass energies from 55 to 61.4 GeV. We observe more events than expected from the incoherent sum of quark-parton and vector-meson-dominance models, and we give a quantitative explanation of the excess by including the hard scattering of the hadronic constituents of the photons calculated with QCD.

Published
1992

25. Effects of hydrogen surface pretreatment of silicon dioxide on the nucleation and surface roughness of polycrystalline silicon films prepared by rapid thermal chemical vapor deposition

Author

Y. Z. Hu, C. Y. Zhao, E. A. Irene, W. X. Gao, and C. Basa

Subjects
Materials science, Physics and Astronomy (miscellaneous), Silicon, Silicon dioxide, Nucleation, Analytical chemistry, chemistry.chemical_element, Surface finish, engineering.material, Epitaxy, chemistry.chemical_compound, Polycrystalline silicon, chemistry, Ellipsometry, Surface roughness, engineering
Abstract

It is well known that Si surface treatment is crucial for low‐temperature Si epitaxy. Although considerable work exists which is aimed at elucidating the effects of Si surface pretreatments on Si epitaxy, little is known about the effects of SiO2 surface pretreatments for polycrystalline silicon (poly‐Si) growth. We report on a study of SiO2 surface pretreatment effects on poly‐Si nucleation and film surface roughness using a low energy hydrogen ion beam (200 eV) and H2 gas annealing (850 °C) in a rapid thermal chemical vapor deposition system. In situ real‐time ellipsometry was used to monitor the surfaces during pretreatment and observe the nucleation. The microstructure and surface roughness of the deposited poly‐Si films are determined by analysis of in situ spectroscopic ellipsometry (SE) and atomic force microscopy (AFM) measurements. Hydrogen ion beam pretreatment was found to produce higher nuclei density and a smoother poly‐Si surface than nonpretreated substrates, and the opposite was found for ...

Published
1996

26. Observation of ballistic conductance and Aharonov–Bohm oscillations in Si/SiGe heterostructures

Author

Khalid EzzEldin Ismail, Sean Washburn, W. X. Gao, J. O. Chu, and Kim Y. Lee

Subjects
Physics, Physics and Astronomy (miscellaneous), Condensed matter physics, Doping, Conductance, Heterojunction, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Coherence length, Condensed Matter::Materials Science, symbols.namesake, Astronomical interferometer, symbols, Harmonic, Aharonov–Bohm effect, Quantum well
Abstract

We have fabricated quantum devices from remotely doped Si/SiGe heterostructures. The devices are interferometers (loops) similar in plan to those used in experiments on ballistic GaAs/AlxGa1−xAs devices. The loops are approximately 2r=0.8 μm in diameter with linewidths of w=0.4 μm. We have observed clear Aharonov–Bohm (AB) oscillations that vanish systematically as the carrier temperature increases. Response of up to the second harmonic of the fundamental AB frequency e/h implies a phase coherence length of around Lφ=1.2 μm. In some samples, we see steps in conductance G(Vg) as a function of gate voltage similar to the ballistic mode steps seen in GaAs/AlxGa1−xAs point contacts.

Published
1994

27. Estimating soil total nitrogen contents from visible/near-infrared reflectance based on successive projections algorithm

Author

C Zhang, W X Gao, H W Peng, Y Liu, X M Shu, and Tiezhu Shi

Subjects
Svm regression, Geography, Visible near infrared, Linear regression, Near-infrared spectroscopy, Total nitrogen, Soil properties, Spectroscopy, Reflectivity, Algorithm, Remote sensing
Abstract

The Visible/near-infrared reflectance (Vis/NIR) spectroscopy combined with multiple regression methods have been employed to assess various soil properties quantitatively. However, useless or irrelevant information in some bands worsen the performances of the calibrated models. Successive projections algorithm (SPA) is an effective technique for selecting informative variables, and its application potential in estimating soil contents using visible/near-infrared reflectance (Vis/NIR) spectroscopy has not been explored. This paper aimed to explore the effect of SPA combined with support vector machine regression (SVMR) on soil total nitrogen (TN) contents estimation using Vis/NIR spectroscopy. For this purpose, SPA-SVMR was compared with full spectrum based SVMR (FS-SVMR) for soil total nitrogen (TN) estimation, respectively. The results showed that the SPA-SVMR model (R2v = 0.58, RMSEV = 0.364) performed better than the FS-SVMR model (R2v = 0.49, RMSEV = 0.394). We concluded that the SPA could eliminate the uninformative variables and improve the performance of SVMR on estimating TN contents. In further study, using the SPA-SVMR method to estimate other soil properties is necessary to test this finding.

Published
2014

28. 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

29. 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

Catalog

Books, media, physical & digital resources
See catalog results