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25 results on '"X. L. Fan"'

1. The ferromagnetic resonance in WxMo1−x/YIG heterostructures

Author

L. Ma, L. L. Lang, H. A. Zhou, X. L. Fan, Z. Shi, H. R. Fu, C. Y. You, and N. Tian

Subjects
Physics, QC1-999
Abstract

The effective spin mixing conductance Gmixeff in WxMo1−x (WMo)/Y3Fe5O12 (YIG) heterostructure has been studied by the measurements of electron spin resonance and spin pumping technique which are based on the ferromagnetic resonance (FMR). It is interesting to find that the FMR linewidth for both YIG single layer and WMo/YIG heterostructures shows twofold and fourfold symmetry contributions although Gmixeff exhibits isotropic feature. The Gmixeff and resistivity ρ present a maximum and minimum value at x = 0.42 for WxMo1−x/YIG heterostructures, respectively, which could be ascribed to the complex phase constituents of the alloy films. This work emphasized that the consistent measurement orientation of YIG single layer and WMo/YIG heterostructures should be strictly obeyed to get the accurate Gmixeff owing to the anisotropic feature of in-plane FMR linewidth, which has always been ignored. Proper alloyed Mo could adjust the spin current related phenomenon of W based alloys, to achieve the high efficiency of spin current production from the large effective spin mixing conductance.

Published
2018
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2. The tunneling magnetoresistance current dependence on cross sectional area, angle and temperature

Author

Z. H. Zhang, Lihui Bai, C.-M. Hu, S. Hemour, K. Wu, X. L. Fan, D. S. Xue, and D. Houssameddine

Subjects
Physics, QC1-999
Abstract

The magnetoresistance of a MgO-based magnetic tunnel junction (MTJ) was studied experimentally. The magnetoresistance as a function of current was measured systematically on MTJs for various MgO cross sectional areas and at various temperatures from 7.5 to 290.1 K. The resistance current dependence of the MTJ was also measured for different angles between the two ferromagnetic layers. By considering particle and angular momentum conservation of transport electrons, the current dependence of magnetoresistance can be explained by the changing of spin polarization in the free magnetic layer of the MTJ. The changing of spin polarization is related to the magnetoresistance, its angular dependence and the threshold current where TMR ratio equals zero. A phenomenological model is used which avoid the complicated barrier details and also describes the data.

Published
2015
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3. Impact Behaviors of Cantilevered Nano-beams Based on the Nonlocal Theory

Author

X. L. Fan, J. W. Yan, N. Zhang, Linquan Yao, and Cheng Li

Subjects
Physics, Cantilever, Deformation (mechanics), Field (physics), Constitutive equation, 02 engineering and technology, Mechanics, 021001 nanoscience & nanotechnology, Stress (mechanics), Moment (mathematics), 020303 mechanical engineering & transports, 0203 mechanical engineering, Deflection (engineering), Bending moment, 0210 nano-technology
Abstract

The present study is motivated by the shock response of a nano-cantilever component in nano-scaled electromechanical system (NEMS). For this purpose, the mechanical properties of a cantilevered nano-beams subjected to impact load are presented for the first time. Our work is concerned with the special moment that the impact deformation gets most and the impact velocity reduces to zero. The nonlocal theory proposed by Eringen is applied to reveal the nonlocal effect involved in impact behaviors at nano-scale. To this end, the classical impact stress is determined first using the law of conservation of energy. Subsequently, the nonlocal impact stress is obtained from the nonlocal constitutive equation and clamped-free boundary constraints of cantilevered nano-beams, where an imaginary equivalent symmetrical nano-structure is constructed to solve the unknown coefficients in general solution of stress of nonlocal field. The bending moment in nonlocal theory is gained from the stress of nonlocal field and the deflection in nonlocal field under impact load is calculated. Finally, the nonlocal dynamical load coefficient is derived via the maximal nonlocal impact deflection divided by the corresponding traditional static deflection at free edge. In numerical examples, the maximal stress of nonlocal field, the maximal nonlocal impact deflection, and the nonlocal dynamical load coefficient are calculated, respectively, to show the significant nonlocal small-scale effect in cantilevered nano-beams subjected to impact load. The conclusion is that the nonlocality plays a remarkable role in nano-scaled impact behaviors and it cannot be neglected. The existence of scale coefficient decreases the nonlocal impact stress, deflection, and dynamical load coefficient. On the contrary, the impact velocity results in a higher nonlocal impact stress, deflection, and dynamical load coefficient. With increasing the scale coefficient, the nonlocal effect increases and the strengthening physical manifestation of nano-structural equivalent stiffness becomes even more pronounced. The results reported herein are expected to provide a useful reference for understanding the scale effect in dynamic impact that often occurs in the working process of NEMS.

Published
2019

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

5. Observation of the π(1800) and π2(1880) mesons in ηηπ− decay

Author

X. Shen, M. Lu, J. J. Manak, J. M. LoSecco, Jens H. Kuhn, M. Witkowski, M. Hayek, N. M. Cason, K. Danyo, D. B. White, W. D. Shephard, V. A. Bodyagin, Irina Vardanyan, S. U. Chung, A. I. Ostrovidov, J. Hu, E. I. Ivanov, P. Eugenio, J. P. Cummings, H. J. Willutzki, M. A. Kostin, N. B. Sinev, R. W. Hackenburg, J. P. Dowd, X. L. Fan, N. Shenhav, Amiran Tomaradze, C. Olchanski, V. V. Lipaev, V. Dorofeev, D. P. Weygand, J. M. Bishop, D. I. Ryabchikov, Kamal K. Seth, D. Joffe, D. L. Stienike, B. Sharin, J. S. Suh, Todd Adams, Vladimir Korotkikh, M. Nozar, T. K. Pedlar, Z. Bar-Yam, E. King, W. Kern, A. A. Yershov, L. I. Sarycheva, S. A. Taegar, Andrey Gribushin, G. S. Adams, D. S. Brown, A. V. Popov, S. P. Denisov, and Olga Kodolova

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Meson, Partial wave analysis, State (functional analysis)
Abstract

A partial-wave analysis of the reaction π − p → η η π − p at 18 GeV/c has been performed on a data sample of approximately 4000 events obtained by Brookhaven experiment E852. The J P C = 0 − + π ( 1800 ) state is observed in the a 0 ( 980 ) η and f 0 ( 1500 ) π decay modes. It has a mass of 1876 ± 18 ± 16 MeV / c 2 and a width of 221 ± 26 ± 38 MeV / c 2 . The J P C = 2 − + π 2 ( 1880 ) meson is observed decaying through a 2 ( 1320 ) η . It has a mass of 1929 ± 24 ± 18 MeV / c 2 and a width of 323 ± 87 ± 43 MeV / c 2 . Both states are potential candidates for non-exotic hybrid mesons.

Published
2008

6. Exotic meson production in BNL experiment E852

Author

M Chasse, J. Hu, Andrey Gribushin, N. Shenhav, Todd Adams, Vladimir Korotkikh, S. A. Taegar, H. J. Willutzki, P. Eugenio, V Dorofeev, A. I. Demianov, W. D. Shephard, D. I. Ryabchikov, K. Danyo, Olga Kodolova, J. S. Suh, C. Olchanski, N. M. Cason, S. U. Chung, K. K. Seth, L. I. Sarycheva, D. L. Stienike, G. S. Adams, D. Joffe, R. W. Hackenburg, J. P. Dowd, N. B. Sinev, X. Shen, M. Lu, D. S. Brown, A. V. Popov, M. Nozar, Jens H. Kuhn, V. V. Lipaev, J. J. Manak, E. King, M. Witkowski, John M. LoSecco, M. Hayek, E. I. Ivanov, I. Kachaev, A Tomaradze, X. L. Fan, A. I. Ostrovidov, T. K. Pedlar, D. P. Weygand, J. M. Bishop, D. B. White, V. A. Bodyagin, M. A. Kostin, J Krenkel, Irina Vardanyan, Z. Bar-Yam, W. Kern, A. A. Yershov, S. P. Denisov, and J. P. Cummings

Subjects
Nuclear physics, Physics, History, Particle physics, Meson, Exotic meson, Computer Science Applications, Education
Abstract

The status of spin-exotic mesons is reviewed. There is now compelling evidence for at least three π1 states between one and two GeV. Preliminary results from the reaction π−p → π+π+π−π−π0p show structure in the exotic waves corresponding to IGJPC = 0−2+−.

Published
2005

7. Exotic meson production in the f1(1285)π− system observed in the reaction π−p→ηπ+π−π−p at 18 GeV/c

Author

N. M. Cason, S. P. Denisov, S. U. Chung, M. Lu, J. P. Cummings, Z. Bar-Yam, H. J. Willutzki, P. Eugenio, N. B. Sinev, S. A. Taegar, R. W. Hackenburg, J. P. Dowd, W. Kern, A. A. Yershov, Amiran Tomaradze, J. S. Suh, C. Olchanski, J. Kuhn, J. J. Manak, J. Napolitano, V. Dorofeev, E. I. Ivanov, T. K. Pedlar, M. Witkowski, Kamal K. Seth, D. Joffe, M. Hayek, I. Kachaev, D. B. White, V. V. Lipaev, V. A. Bodyagin, D. P. Weygand, M. A. Kostin, L. I. Sarycheva, A. I. Demianov, J. M. LoSecco, Irina Vardanyan, X. Shen, N. Shenhav, K. Danyo, J. Hu, A. I. Ostrovidov, J. M. Bishop, Todd Adams, Vladimir Korotkikh, W. D. Shephard, X. L. Fan, D. L. Stienike, E. King, Andrey Gribushin, Olga Kodolova, D. I. Ryabchikov, G. S. Adams, D. S. Brown, A. V. Popov, and M. Nozar

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Flux tube, Meson, Partial wave analysis, Theoretical models, Parity (physics), Exotic meson, Atomic physics, Nuclear Experiment, Quantum number
Abstract

This Letter reports results from the partial wave analysis of the π−π−π+η final state in π−p collisions at 18 GeV /c . Strong evidence is observed for production of two mesons with exotic quantum numbers of spin, parity and charge conjugation, JPC=1−+ in the decay channel f1(1285)π−. The mass M=1709±24±41 MeV /c 2 and width Γ=403±80±115 MeV /c 2 of the first state are consistent with the parameters of the previously observed π1(1600). The second resonance with mass M=2001±30±92 MeV /c 2 and width Γ=333±52±49 MeV /c 2 agrees very well with predictions from theoretical models. In addition, the presence of π2(1900) is confirmed with mass M=2003±88±148 MeV /c 2 and width Γ=306±132±121 MeV /c 2 and a new state, a1(2096), is observed with mass M=2096±17±121 MeV /c 2 and width Γ=451±41±81 MeV /c 2 . The decay properties of these last two states are consistent with flux tube model predictions for hybrid mesons with non-exotic quantum numbers.

Published
2004
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8. Observation of Exotic Meson Production in the Reactionπ−p→η′π−pat18GeV/c

Author

J. P. Cummings, A. I. Ostrovidov, D. B. White, V. A. Bodyagin, M. A. Kostin, J. Napolitano, M. Nozar, E. I. Ivanov, H. J. Willutzki, J. M. Bishop, E. King, S. A. Taegar, I. Kachaev, Todd Adams, Vladimir Korotkikh, Olga Kodolova, M. Witkowski, V. V. Lipaev, N. Shenhav, D. I. Ryabchikov, M. Hayek, N. M. Cason, J. J. Manak, L. I. Sarycheva, S. U. Chung, D. Joffe, J. A. Smith, Jens H. Kuhn, J. M. LoSecco, N. B. Sinev, D. L. Stienike, W. D. Shephard, G. S. Adams, T. K. Pedlar, X. L. Fan, D. S. Brown, V. Dorofeev, A. V. Popov, Kamal K. Seth, S. P. Denisov, D. P. Weygand, Irina Vardanyan, R. W. Hackenburg, X. Shen, J. P. Dowd, Amiran Tomaradze, Z. Bar-Yam, W. Kern, A. A. Yershov, K. Danyo, P. Eugenio, and C. Olchanski

Subjects
Physics, Particle physics, Crystallography, Meson, Partial wave analysis, Pi, General Physics and Astronomy, Exotic meson
Abstract

An amplitude analysis of an exclusive sample of 5765 events from the reaction {pi}{sup -}p{yields}{eta}{prime}{pi}{sup -}p at 18 GeV/c is described. The {eta}{prime}{pi}{sup -} production is dominated by natural parity exchange and by three partial waves: those with J{sup PC}=1{sup -+} , 2{sup ++} , and 4{sup ++} . A mass-dependent analysis of the partial-wave amplitudes indicates the production of the a{sub 2}(1320) meson as well as the a{sub 4}(2040) meson, observed for the first time decaying to {eta}{prime}{pi}{sup -} . The dominant, exotic (non-q{bar q}) 1{sup -+} partial wave is shown to be resonant with a mass of 1.597{+-}0.010{sup +0.045}{sub -0.010} GeV/c{sup 2} and a width of 0.340{+-}0.040{+-}0.050 GeV /c{sup 2} . This exotic state, the {pi}{sub 1}(1600) , is produced with a t dependence which is different from that of the a{sub 2}(1320) meson, indicating differences between the production mechanisms for the two states.

Published
2001

9. Study of theχc0(1P03)State of Charmonium Formed inp¯pAnnihilations

Author

P. F. Dalpiaz, Kamal K. Seth, Nadia Pastrone, S. Bagnasco, R. Mussa, W. Marsh, John Peoples, S. Jin, Paolo Rumerio, A. Buzzo, M. Mandelkern, R. Calabrese, Maria Margherita Obertino, Marco Pallavicini, R. Cester, M. Stancari, A. Hahn, A. Santroni, J. Schultz, S. Pordes, M. Savrie, E. Menichetti, M. Lo Vetere, J. Streets, G. Zioulas, K. Gollwitzer, D. Bettoni, S. J. Werkema, Enrico Robutti, W. Baldini, M. Ambrogiani, Amiran Tomaradze, J. L. Rosen, M. M. Macri, C. Patrignani, G. Lasio, J. Kasper, Giulio Stancari, Mauro Marinelli, X. L. Fan, Eleonora Luppi, P. Maas, Stefano Argiro, Giorgio Borreani, Gabriele Garzoglio, F. Marchetto, T. K. Pedlar, and M. Martini

Subjects
Quantum chromodynamics, Physics, Particle physics, General Physics and Astronomy, State (functional analysis), Fermilab
Published
1999

10. 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

11. 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

12. 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

13. 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

14. 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

15. 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

16. 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

17. Nonlinear behavior for the uniform mode and horizontal standing spin-wave modes in metallic ferromagnetic microstrips: Experiment and theory

Author

Robert E. Camley, B. W. Southern, Can-Ming Hu, Yongsheng Gui, X. L. Fan, and M. P. Wismayer

Subjects
Physics, Condensed matter physics, Field (physics), Plane (geometry), business.industry, Resonance, Condensed Matter Physics, Magnetostatics, Electronic, Optical and Magnetic Materials, Amplitude, Optics, Spin wave, business, Microwave, Spin-½
Abstract

Micron-sized rectangular ferromagnetic bars have a variety of spin excitations, including a quasi-uniform mode, horizontal and vertical standing spin-wave modes, and edge and corner modes. When driven by a strong microwave field, these modes differ from those found in the linear regime. For example, the resonance field or frequency becomes amplitude dependent. We study the nonlinear spin dynamics in such microstrips, both experimentally and theoretically, for a geometry where the static magnetic field is perpendicular to the plane of the sample. Experimentally, it is found that, at a fixed microwave frequency, the resonance field for the uniform mode is significantly reduced as the microwave power is increased. In contrast, the resonance fields for the standing horizontal spin-wave modes are only slightly reduced. This behavior is confirmed theoretically using micromagnetic calculations, and an intuitive explanation for this behavior is developed.

Published
2012

18. Analysis of the line shape of electrically detected ferromagnetic resonance

Author

Can-Ming Hu, Yongsheng Gui, Z. X. Cao, Michael Harder, and X. L. Fan

Subjects
Physics, Spin pumping, Condensed matter physics, Spintronics, Spin polarization, Condensed Matter::Other, Spin engineering, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Ferromagnetic resonance, Electronic, Optical and Magnetic Materials, Condensed Matter::Materials Science, Magnetization, 0103 physical sciences, Spin Hall effect, 010306 general physics, 0210 nano-technology, Spin (physics)
Abstract

This work reviews and examines two particular issues related with the new technique of electrical detection of ferromagnetic resonance (FMR). This powerful technique has been broadly applied for studying magnetization and spin dynamics over the past ten years. The first issue is the relation and distinction between different mechanisms that give rise to a photovoltage via FMR in spintronic devices, and the second is the proper analysis of the FMR line shape, which has become the ``Achilles heel'' in interpreting experimental results, especially for either studying the spin pumping effect or quantifying spin Hall angles via the electrically detected FMR.

Published
2011

19. Exotic Meson Decay toωπ0π−

Author

D. B. White, V. A. Bodyagin, Irina Vardanyan, G. S. Adams, A. I. Ostrovidov, R. W. Hackenburg, J. P. Dowd, X. Shen, M. Witkowski, M. Hayek, T. K. Pedlar, K. K. Seth, Amiran Tomaradze, M. A. Kostin, N. M. Cason, P. Eugenio, Olga Kodolova, E. King, S. A. Taegar, J. J. Manak, J. P. Cummings, Z. Bar-Yam, J. S. Suh, S. U. Chung, V. V. Lipaev, J. M. LoSecco, D. P. Weygand, H. J. Willutzki, Todd Adams, Vladimir Korotkikh, M. Lu, K. Danyo, W. Kern, A. A. Yershov, L. I. Sarycheva, X. L. Fan, A. I. Demianov, Andrey Gribushin, N. B. Sinev, D. I. Ryabchikov, C. Olchanski, J. Hu, E. I. Ivanov, M. Nozar, D. L. Stienike, N. Shenhav, D. S. Brown, A. V. Popov, W. D. Shephard, V. Dorofeev, D. Joffe, I. Kachaev, J. M. Bishop, J. Kuhn, and S. P. Denisov

Subjects
Physics, Particle physics, Meson, Isovector, Partial wave analysis, General Physics and Astronomy, Exotic meson, Omega
Abstract

A partial-wave analysis of the mesons from the reaction $\pi^{-}% p\to\pi^{+}\pi^{-}\pi^{-}\pi^{0}\pi^{0}p$ has been performed. The data show $b_{1}\pi$ decay of the spin-exotic states $\pi_{1}(1600)$ and \ $\pi_{1}(2000)$. Three isovector $2^{-+}$ states were seen in the $\omega\rho^{-}$ decay channel. In addition to the well known $\pi_{2}(1670)$, signals were also observed for $\pi_{2}(1880)$ and $\pi_{2}(1970)$.

Published
2005

20. Exotic andqq¯resonances in theπ+π−π−system produced inπ−pcollisions at18 GeV/c

Author

K. Danyo, W. D. Shephard, T. K. Pedlar, K. K. Seth, D. B. White, V. A. Bodyagin, J. P. Cummings, Irina Vardanyan, H. J. Willutzki, Todd Adams, Vladimir Korotkikh, Jens H. Kuhn, Suh-urk Chung, X. L. Fan, X. Shen, M. A. Kostin, N. Shenhav, E. I. Ivanov, D. Joffe, V. Dorofeev, J. M. LoSecco, P. Eugenio, V. V. Lipaev, J. Hu, A. I. Ostrovidov, C. Olchanski, M. Lu, R. W. Hackenburg, J. P. Dowd, Amiran Tomaradze, J. M. Bishop, N. M. Cason, J. Napolitano, J. J. Manak, D. L. Stienike, J. S. Suh, D. I. Ryabchikov, Z. Bar-Yam, S. A. Taegar, M. Witkowski, L. I. Sarycheva, W. Kern, A. A. Yershov, M. Hayek, E. King, D. P. Weygand, G. S. Adams, D. S. Brown, A. V. Popov, Olga Kodolova, S. P. Denisov, and M. Nozar

Subjects
Physics, Nuclear and High Energy Physics, Crystallography, Resonance
Abstract

A partial-wave analysis of the reaction ${\ensuremath{\pi}}^{\ensuremath{-}}\stackrel{\ensuremath{\rightarrow}}{p}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}p$ at $18 \mathrm{GeV}/c$ has been performed on a data sample of 250 000 events obtained in the Brookhaven experiment E852. The well-known ${a}_{1}(1260),$ ${a}_{2}(1320)$ and ${\ensuremath{\pi}}_{2}(1670)$ resonant states are observed. The existence of the $\ensuremath{\pi}(1800),$ ${a}_{1}(1700)$ and ${a}_{4}(2040)$ states is confirmed. The ${a}_{3}(1874)$ state is also observed. The exotic ${1}^{\ensuremath{-}+}$ ${\ensuremath{\pi}}_{1}(1600)$ state produced in the natural parity exchange process is found to decay in the $\ensuremath{\rho}(770){\ensuremath{\pi}}^{\ensuremath{-}}$ channel. A mass-dependent fit results in a resonance mass of $1593\ifmmode\pm\else\textpm\fi{}{8}_{\ensuremath{-}47}^{+29} \mathrm{MeV}{/c}^{2}$ and a width of $168\ifmmode\pm\else\textpm\fi{}{20}_{\ensuremath{-}12}^{+150} \mathrm{MeV}{/c}^{2}.$

Published
2002

21. Monte Carlo simulation of the Tau/charm Factory at IHEP

Author

Y. Z. Huang, H. M. Liu, S. Jin, B. S. Cheng, S. M. Chen, D. H. Zhang, S. Z. Ye, J. L. Hu, X. L. Fan, W. J. Xiong, and A. M. Ma

Subjects
Nuclear physics, Physics, Particle physics, Monte Carlo method, Factory (object-oriented programming), High Energy Physics::Experiment, Charm (quantum number), Neutrino
Abstract

We report new results of a Monte Carlo study to assess the merits of the Tau/charm factory. We investigate several key physics issues, such as the identification of glueballs and the determination of the upper limit of the τ neutrino mass. We conclude with an overview of our plans for the near future.

Published
1996

22. 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

23. 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

24. 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

25. Level attraction and level repulsion of magnon coupled with a cavity anti-resonance

Author

J W Rao, C H Yu, Y T Zhao, Y S Gui, X L Fan, D S Xue, and C-M Hu

Subjects
anti-resonance, cavity photon-magnon coupled system, level attraction, Science, Physics, QC1-999
Abstract

We report on coherent and dissipative coupling between a magnon mode and an anti-resonance of transmission in a cylindrical microwave cavity. By effectively suppressing coherent coupling, we observe the hybridized dispersion to change from level repulsion to level attraction. A careful examination reveals distinct differences in the line shape and phase evolution of transmission spectra between these coupling behaviors. For a quantitative understanding of the interactions between the magnon mode and the cavity anti-resonance, we develop a model which precisely describes our experimental observations, particularly, the signature in the line shape and phase of the microwave transmission. Our work sets a foundation for understanding strong coupling between magnon modes and cavity anti-resonances. In addition, it also confirms the ubiquity of level attraction in coupled magnon-photon systems, which may be helpful to develop future magnon-based hybrid quantum systems.

Published
2019
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