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27 results on '"Stephen L. Olsen"'

1. First Direct Search for Inelastic Boosted Dark Matter with COSINE-100

Author

S. Choi, R. L. C. Pitta, H. W. Joo, W. G. Thompson, K. A. Shin, Stephen L. Olsen, Carsten Rott, K. W. Kim, H. Prihtiadi, F. Mouton, A. Scarff, E. Barbosa de Souza, Yong Hamb Kim, V. A. Kudryavtsev, Reina H. Maruyama, Nam Young Kim, H. J. Kim, Govinda Adhikari, J.H. Lee, N. J. C. Spooner, W. A. Lynch, G. S. Kim, David Leonard, M. Kauer, Kangsoon Park, P. Adhikari, Y. D. Kim, J. H. Jo, N. Carlin, Woosik Kang, G. H. Yu, Insik Hahn, Won Nam Kang, H. Kim, Hyun Su Lee, Mitra Djamal, Joo Young Lee, B. J. Park, Eunju Jeon, S. K. Kim, C. Ha, Y. J. Ko, Liang Yang, S. J. Ra, A. C. Ezeribe, Hansoo Park, Hyangkyu Park, and Moo Hyun Lee

Subjects
Physics, Physics - Instrumentation and Detectors, COLISÕES DE ÍONS PESADOS RELATIVÍSTICOS, Dark matter, FOS: Physical sciences, General Physics and Astronomy, Instrumentation and Detectors (physics.ins-det), Electron, Parameter space, Inelastic scattering, 01 natural sciences, Galaxy, Dark photon, Standard Model, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Event (particle physics), Nuclear Experiment
Abstract

A search for inelastic boosted dark matter (iBDM) using the COSINE-100 detector with 59.5 days of data is presented. This relativistic dark matter is theorized to interact with the target material through inelastic scattering with electrons, creating a heavier state that subsequently produces standard model particles, such as an electron-positron pair. In this study, we search for this electron-positron pair in coincidence with the initially scattered electron as a signature for an iBDM interaction. No excess over the predicted background event rate is observed. Therefore, we present limits on iBDM interactions under various hypotheses, one of which allows us to explore an area of the experimental search for iBDM using a terrestrial detector., 6 pages, 5 figures

Published
2018

2. Background model for the NaI(Tl) crystals in COSINE-100

Author

Seonho Choi, J. H. Jo, H. Prihtiadi, E. Barbosa de Souza, A. C. Ezeribe, Stephen L. Olsen, M. Kauer, Ju-Yeol Lee, F. Mouton, B.H. Kim, W.A. Lynch, Hongjoo Kim, Reina H. Maruyama, Carsten Rott, K. W. Kim, W. G. Thompson, Y.D. Kim, C. Ha, Govinda Adhikari, N. Carlin, J. Y. Lee, Eunju Jeon, Nam Young Kim, W. Q. Choi, V. A. Kudryavtsev, Kangsoon Park, J.S. Park, A. Scarff, H. W. Joo, Insik Hahn, Hansoo Park, S.H. Yong, Hyangkyu Park, Moo Hyun Lee, M.C. Kim, S. K. Kim, Woon Gu Kang, N. J. C. Spooner, Hyun Su Lee, Mitra Djamal, P. Adhikari, David Leonard, A.J.F. Hubbard, W. Kang, Yong Hamb Kim, Walter C. Pettus, H. J. Kim, S. J. Ra, and Liang Yang

Subjects
Physics - Instrumentation and Detectors, Physics and Astronomy (miscellaneous), Regular Article - Experimental Physics, Monte Carlo method, Dark matter, FOS: Physical sciences, lcsh:Astrophysics, 01 natural sciences, Particle detector, Nuclear physics, lcsh:QB460-466, 0103 physical sciences, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010306 general physics, Engineering (miscellaneous), Instrumentation and Methods for Astrophysics (astro-ph.IM), Background radiation, Physics, Isotope, 010308 nuclear & particles physics, Instrumentation and Detectors (physics.ins-det), Scintillation counter, Measuring instrument, lcsh:QC770-798, Astrophysics - Instrumentation and Methods for Astrophysics, Radioactive decay
Abstract

The COSINE-100 dark matter search experiment is an array of NaI(Tl) crystal detectors located in the Yangyang Underground Laboratory (Y2L). To understand measured backgrounds in the NaI(Tl) crystals we have performed Monte Carlo simulations using the Geant4 toolkit and developed background models for each crystal that consider contributions from both internal and external sources, including cosmogenic nuclides. The background models are based on comparisons of measurement data with Monte Carlo simulations that are guided by a campaign of material assays and are used to evaluate backgrounds and identify their sources. The average background level for the six crystals (70 kg total mass) that are studied is 3.5 counts/day/keV/kg in the (2–6) keV energy interval. The dominant contributors in this energy region are found to be \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$^{210}$$\end{document}210Pb and \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$^3$$\end{document}3H.

Published
2018

3. COMMENTS ON THE XYZ MESONS

Author

Stephen L. Olsen

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Meson, Bar (music), High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Astronomy and Astrophysics, Tetraquark, Atomic and Molecular Physics, and Optics
Abstract

Belle and BaBar have recently reported observations of meson states that decay to final states containing a c and [Formula: see text]-quark but with properties that do not match well to those expected for any of the as-yet unassigned charmonium [Formula: see text] meson states. Among the suggested interpretations for these states are meson-antimeson molecular states, diquark-antidiquark tetraquarks and/or [Formula: see text]-gluon hybrid mesona. I briefly review what is experimentally known about these states and comment on the status of recent attempts to classify them.

Published
2006
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4. OBSERVATION OF LARGE CP VIOLATION IN THE B-MESON SYSTEM

Author

Stephen L. Olsen

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, media_common.quotation_subject, Zero (complex analysis), Astronomy and Astrophysics, Resonance (particle physics), Asymmetry, Atomic and Molecular Physics, and Optics, law.invention, Nuclear physics, KEKB, law, CP violation, B meson, Collider, media_common
Abstract

A measurement of the CP violation parameter sin 2ϕ1 based on a 29.1 fb-1 data sample recorded at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric e+ e- collider is reported. One neutral B meson is fully reconstructed as a J/ψKS, ψ(2S)KS, χc1KS, ηcKS, J/ψKL or J/ψK*0 decay and the flavor of the accompanying B meson is identified from its decay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we determine sin 2ϕ1 = 0.99±0.14(stat) ±0.06(sys). Since this value is more than 6σ from zero, we can conclude that CP symmetry is violated in the neutral B meson system.

Published
2002
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5. Observation off2′(1525) Production in HighQ2Two Photon Interactions at TRISTAN

Author

Takashi Sasaki, A. M. Bacala, Richard Lander, Jeffrey Rowe, Satyajit Behari, T. Aso, Tadao Nozaki, A. Abashian, K. Gotow, Y. Fujii, Koji Ueno, Naomi Takashimizu, Shigeo Matsumoto, Hitoshi Miyata, Hiroyuki Sagawa, Soo Kyung Choi, Tsunehiko Omori, Dong Yong Kim, Yoshinobu Takaiwa, Kazumasa Miyano, Y. Sakai, Ho Seok Ahn, Yasuhiro Sugimoto, Susumu Terada, Yousuke Yamashita, C. Rosenfeld, Richard Breedon, Winston Ko, Stephen L. Olsen, A. Murakami, Yoshimasa Kurihara, Moo Hyun Lee, Hong Joo Kim, Miyuki Shirai, Steve Schnetzer, Sun Kee Kim, Leo Piilonen, A. Maki, Kazuo Abe, Shigeharu Kobayashi, Joo Sang Kang, Akinori Kimura, and N. Nakajima

Subjects
Physics, Nuclear physics, Photon, Two-photon excitation microscopy, General Physics and Astronomy, Virtual particle, Resonance (particle physics)
Abstract

We have studied K S 0 K S 0 production in the interactions of a virtual photon ( Q 2 >0) with a real photon and observed the resonance production of f 2 ′ (1525). A total of 5.0±2.2(sta)±0.5(sys) f...

Published
2001
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6. The BES upgrade

Author

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

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

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

Published
2001
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7. An experimental study of the process e+e−→e+e−μ+μ−

Author

R. L. Lander, N. Nakajima, S. K. Choi, C. Rosenfeld, K. Gotow, Takashi Sasaki, H. S. Ahn, P. N. Kirk, Saroj Kumar Sahu, H. Miyata, Y. Yamashita, Y. Sakai, Yuki Fujii, Winston Ko, K. Ueno, S. Behari, A. Murakami, Tsunehiko Omori, L. E. Piilonen, Moo Hyun Lee, A. M. Bacala, Koji Abe, S. Igarashi, T. Aso, Richard Breedon, D. Y. Kim, J. Rowe, M. Sato, Yasuhiro Sugimoto, S. S. Myung, A. Abashian, Hiroyuki Sagawa, A. Kimura, T. Nozaki, J. S. Kang, S. K. Kim, Y. Takaiwa, Hyunyong Kim, S. Kobayashi, Kazumasa Miyano, Naomi Takashimizu, Susumu Terada, Stephen L. Olsen, Yoshimasa Kurihara, M. Shirai, T. J. Wang, Steve Schnetzer, A. Maki, L. Y. Zheng, and S. Matsumoto

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Analytical chemistry, High Energy Physics::Experiment, Luminosity
Abstract

We present the results of a study of e + e − μ + μ − final states produced in e + e − collisions at a center-of-mass energy of 58 GeV using the AMY detector at TRISTAN. The data correspond to a total integrated luminosity of 292.8 pb −1 . The results show good agreement with order α 4 QED predictions.

Published
1998
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8. Search forψ(2S)production ine+e−annihilations at 4.03 GeV

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Photon, Electron, Radiation, law.invention, Nuclear physics, Positron, law, Metastability, High Energy Physics::Experiment, Production (computer science), Collider
Abstract

A search is performed for the production of the ψ(2S) in e^+e^- annihilation at a center-of-mass energy of 4.03 GeV using the BES detector operated at the Beijing Electron Positron Collider (BEPC). The kinematic features of the reconstructed ψ(2S) signal are consistent with its being produced only in association with an energetic photon resulting from initial state radiation (ISR). Limits are placed on ψ(2S) production from the decay of unknown charmonia or metastable hybrids that might be produced in e^+e^- annihilations at 4.03 GeV. Under the assumption that the observed cross section for ψ(2S) production is due entirely to ISR, the partial width Γ_(ee) of the ψ(2S) is measured to be 2.07±0.32keV.

Published
1998
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9. Puzzles in Hadronic Charmonium Decays

Author

Stephen L. Olsen

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Meson, High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment, Astronomy and Astrophysics, Tensor, Pseudoscalar meson, Atomic and Molecular Physics, and Optics, Bar (unit)
Abstract

Recent results of experimental studies of hadronic decays of charmonium states using the BES detector are reported. A number of puzzling features are observed. Foremost among these is the large discrepancy between the decay rates for J/ψ and ψ(2S) decays to ρπ and [Formula: see text] final states, first observed by the Mark II experiment. We find suppressions for ψ(2S) decays to these modes of factors in excess of sixty and twenty, respectively. Similar, although less dramatic, suppressions of vector plus tensor meson final states are also observed. No suppression is seen for axialvector plus pseudoscalar meson decays, but a strong flavor-SU(3) violation is seen in [Formula: see text] final states that has an opposite character for the J/ψ and ψ(2S).

Published
1997
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10. Measurement of the forward-backward asymmetry in ee → b and the b-quark branching ratio to muons at TRISTAN using neural networks

Author

Takashi Sasaki, P. N. Kirk, Hiroyuki Sagawa, Suyong Choi, K. Gotow, Y. Fujii, S. S. Myung, C. Rosenfeld, A. Murakami, M. H. Lee, M. Shirai, Y. Yamashita, S. Igarashi, F. Liu, A. Maki, T. Aso, L. Y. Zheng, K. Ohkubo, S. Kobayashi, D. Y. Kim, S. Behari, Yasuhiro Sugimoto, S. Matsumoto, T. Nozaki, Stephen L. Olsen, H. S. Ahn, N. Takashimizu, Yoshimasa Kurihara, Kazuo Abe, N. Nakajima, S. Kanda, M. Yang, R. L. Lander, S. K. Sahu, Kazumasa Miyano, T. J. Wang, Y. Takaiwa, Steve Schnetzer, H. Fujimoto, Susumu Terada, Winston Ko, Richard Breedon, K. Ueno, M. Sato, Seong Keun Kim, A. Abashian, J. S. Kang, F. Kajino, J. Rowe, Tsunehiko Omori, H. Miyata, Y. Sakai, and L. E. Piilonen

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Artificial neural network, Branching fraction, media_common.quotation_subject, High Energy Physics::Phenomenology, Forward backward, Asymmetry, Bottom quark, Standard Model, Nuclear physics, High Energy Physics::Experiment, media_common, Bar (unit)
Abstract

The forward-backward asymmetry in e(+)e(-) --> b (b) over bar at root s = 57.9 GeV and the b-quark branching ratio to muons have been measured using neural networks. Unlike previous methods for measuring the b (b) over bar forward-backward asymmetry where the estimated background from c-quark decays and other sources are subtracted, here events are categorized as either b (b) over bar or non-b (b) over bar events by neural networks based on event-by-event characteristics. The determined asymmetry is -0.429 +/- 0.044(stat) +/- 0.047(sys) and is consistent with the prediction of the standard model. The measured B (B) over bar mixing parameter is 0.136 +/- 0.037(stat) +/- 0.040(sys) +/- 0.002(model) and the measured b-quark branching ratio to muons is 0.122 +/- 0.006(stat) +/- 0.007(sys).

Published
1996
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11. New limits on the masses of the selectron and photino

Author

Richard Breedon, R. L. Lander, C. Rosenfeld, M. Sato, T. J. Wang, S. K. Sahu, Kazumasa Miyano, L. E. Piilonen, Hiroyuki Sagawa, Y. Fujii, Y. Takaiwa, Tsunehiko Omori, H. Fujimoto, T. Nozaki, S. Behari, Stephen L. Olsen, Susumu Terada, A. Abashian, S. Igarashi, S. S. Myung, J. S. Kang, N. Takashimizu, S. Kobayashi, F. Liu, F. Kajino, Yoshimasa Kurihara, H. Miyata, D. Y. Kim, Y. Sakai, K. Ohkubo, A. Maki, Moo Hyun Lee, M. Shirai, A. Murakami, J. Rowe, L. Y. Zheng, Kazuo Abe, Seong Keun Kim, N. Nakajima, H. S. Ahn, P. N. Kirk, Winston Ko, Y. Yamashita, Takashi Sasaki, Suyong Choi, M. Yang, S. Matsumoto, Steve Schnetzer, S. Kanda, K. Gotow, T. Aso, K. Ueno, and Y. Sugimoto

Subjects
Massless particle, Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Selectron tube, Electron–positron annihilation, Scalar (mathematics), Supersymmetry, Center of mass, Photino, Standard Model
Abstract

A study of e + e − annihilations into final states containing a single energetic photon with no accompanying particles is made at a center of mass energy of 57.8 GeV. The measured cross section is consistent with expectations from standard model processes and is used to set limits on the masses of the scalar electron and photino particles predicted by supersymmetry theories. If the photino is assumed to be massless, the 90% confidence level lower limit on the mass of the degenerate scalar electron is 65.5 GeV. If the results of all the single photon experiments are combined, this lower limit increases to 79.3 GeV.

Published
1996
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12. Study of two particle azimuthal correlations ine+e−annihilation at √s=58 GeV

Author

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

Subjects
Physics, Particle physics, Annihilation, High Energy Physics::Phenomenology, Hadron, Monte Carlo method, Perturbative QCD, Parton, Hadronization, Gluon, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Event (particle physics)
Abstract

We have measured the azimuthal correlation of hadrons produced in e(+)e(-) annihilations at root s=58 GeV. In perturbative QCD these correlations are sensitive to the interference between soft gluons emitted at large angles with respect to the event axis. However, Monte Carlo calculations incorporating QCD-inspired hadronization models in which the correlation of interjet particles is treated in a phenomenological manner describe the data well. We also observe that angular ordering of the parton showering in the LUND Monte Carlo program improves the agreement with the data.

Published
1995
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13. Measurement of charm production in two-photon processes using inclusive lepton events at TRISTAN

Author

L. E. Piilonen, Bj Kim, S. K. Sahu, Kazumasa Miyano, K. Ohkubo, Seong Keun Kim, M. H. Lee, Susumu Terada, K. Gotow, Y. Fujii, M. Oyoshi, N. Nakajima, A. Murakami, P. N. Kirk, T. Aso, S. Behari, H. S. Ahn, Suyong Choi, Takashi Sasaki, R. L. Lander, Y. Yamashita, S. Matsumoto, S. Kobayashi, Kisoo Lee, Kazuo Abe, K. Ueno, Y. Sugimoto, A. Abashian, H. Fujimoto, J. R. Smith, S. Kanda, M. Yang, Winston Ko, Hiroyuki Sagawa, J. Rowe, J. S. Kang, F. Kajino, Tsunehiko Omori, Dong-Chul Son, T. J. Wang, A. Bodek, Ryuki Tanaka, Steve Schnetzer, M. Shirai, Y. Takaiwa, N. Takashimizu, C. Rosenfeld, H. Miyata, Y. Sakai, Stephen L. Olsen, S. S. Myung, A. Maki, L. Y. Zheng, Yoshimasa Kurihara, T. Nozaki, F. Liu, D. Y. Kim, Richard Breedon, and M. Sato

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Muon, High Energy Physics::Phenomenology, Hadron, Electron, Charm quark, Nuclear physics, High Energy Physics::Experiment, Center of mass, Charm (quantum number), Nuclear Experiment, Lepton
Abstract

Measurements of open charm production in photon-photon collisions made with the AMY detector at TRISTAN are reported. Charmed hadrons were identified by detecting the high momentum muons or electrons from their semileptonic decays. The data sample corresponds to an integrated luminosity of 275 pb −1 at an average center of mass energy of 58 GeV. Results are presented in the form of cross sections of inclusive leptons from charm for both muons and electrons. The measured cross section is 1.8 standard deviations higher than theoretical predictions based on the direct and photon-gluon fusion process, where the mass of charm quark is assumed to be 1.6 GeV.

Published
1995
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14. A measurement of Bose-Einstein correlations in e+e− annihilation at TRISTAN

Author

M. E. Mattson, H. Miyata, A. Murakami, Kazuo Abe, Hiroyuki Sagawa, K. Ueno, Y. Sugimoto, J. Rowe, A. Bodek, P. N. Kirk, Y. Yamashita, Tsunehiko Omori, Ryuki Tanaka, Y. Takaiwa, T. Nozaki, Bj Kim, S. Matsumoto, C. Rosenfeld, C. A. Fry, J. S. Kang, Stephen L. Olsen, F. Kajino, Yoshimasa Kurihara, F. Liu, M. Oyoshi, K. Gotow, N. Takashimizu, M. Shirai, R. C. Walker, S. S. Myung, T. Aso, Steve Schnetzer, S. Kanda, Richard Breedon, Seong Keun Kim, Saroj Kumar Sahu, Takashi Sasaki, S. Ebara, K. L. Sterner, M. Sato, J. Vinson, Suyong Choi, S. Behari, A. Maki, L. Y. Zheng, R. L. Lander, D. Y. Kim, Moo Hyun Lee, K. Ohkubo, L. E. Piilonen, Winston Ko, C. Velissaris, Kazumasa Miyano, Susumu Terada, N. Nakajima, S. Kobayashi, A. Abashian, Y. Fujii, and Y. Sakai

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, law, Track (disk drive), Detector, High Energy Physics::Experiment, Bose–Einstein correlations, Collider, law.invention
Abstract

Using e+e− annihilation events accumulated with the AMY detector at the TRISTAN collider, we have studied the Bose-Einstein correlations in the distributions of like-sign charged tracks. As reference samples we used the opposite-sign charged track pairs and mixed pairs, which are like-sign pairs synthesized from tracks belonging to different events. The results of the different reference samples give approximately 0.45 for the correlation strength and approximately 0.65 fm for the source size. Previous measurements of these parameters in e+e− annihilation at energies from CESR to LEP show remarkably flat dependence on s . Our results conform well with this picture.

Published
1995
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15. 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
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16. A high-Q2 measurement of the photon structure function F2

Author

N. Takashimizu, T. Nozaki, Bj Kim, N. Nakajima, Dong-Chul Son, K. Gotow, David Stuart, Winston Ko, T. Aso, Saroj Kumar Sahu, S. Behari, Takashi Sasaki, Kazuo Abe, F. Kajino, J. S. Kang, F. Liu, S. Kobayashi, C. Rosenfeld, M. E. Mattson, S. Ebara, Moo Hyun Lee, Richard Breedon, K. Ueno, Y. Sugimoto, K. Ohkubo, S. S. Myung, L. E. Piilonen, P. N. Kirk, Suyong Choi, H. Fujimoto, J. R. Smith, Y. Yamashita, K. L. Sterner, A. Abashian, Y. Sakai, Kisoo Lee, S. Kanda, D. Y. Kim, T. J. Wang, H. Miyata, Y. Fujii, Ryuki Tanaka, Y. Takaiwa, C. Velissaris, M. Oyoshi, R. L. Lander, M. Yang, M. Shirai, Stephen L. Olsen, Yoshimasa Kurihara, A. Maki, A. Murakami, Seong Keun Kim, Tsunehiko Omori, J. Rowe, L. Y. Zheng, S. Matsumoto, A. Bodek, Steve Schnetzer, Kazumasa Miyano, Susumu Terada, Hiroyuki Sagawa, M. Sato, and J. Vinson

Subjects
Momentum, Physics, Nuclear physics, Nuclear and High Energy Physics, Photon, law, Detector, Parton, Atomic physics, Collider, Photon structure function, law.invention
Abstract

The photon structure function F 2 γ has been measured at average Q 2 values of 73 and 390 GeV 2 using data collected by the AMY detector at the TRISTAN e + e − collider. F 2 γ is observed to be increasing as ln Q 2 . The x -dependence of F 2 γ , where x is the momentum fraction carried by the parton inside the photon, is also measured. The measurements are compared with several parton density models.

Published
1995
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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
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18. 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
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19. 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
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20. Exotic meson candidates: some recent results

Author

Stephen L. Olsen and Marvin L. Marshak

Subjects
Quark, Nuclear physics, Physics, Particle physics, Particle decay, Meson, Dalitz plot, Invariant mass, B meson, Exotic meson, Particle identification
Abstract

Recent results on the so‐called XYZ states are presented, including: a near‐threshold ωJ/ψ mass peak seen by Belle in the two‐photon process γγ→ωJ/ψ; evidence from CDF for a φJ/ψ mass peak in B−φJ/ψ decays; a Belle search for D*Dπ decays of the 1−−Y states; and a Dalitz‐plot analysis of B→Kπ±ψ′ decays by Belle that confirms their original claim for the Z(4430)+→π±ψ.

Published
2009
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21. Status of BEPC-II and BES-III

Author

Stephen L. Olsen and Marvin L. Marshak

Subjects
Physics, Particle physics, Physics::Instrumentation and Detectors, Hadron, Detector, Computer Science::Computational Geometry, Particle identification, law.invention, Nuclear physics, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Positron emission, Collider
Abstract

The status of the BEPC‐II e+e− collider and the new BES‐III detector is reviewed.The status of the BEPC‐II e+e− collider and the new BES‐III detector is reviewed.

Published
2009
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23. Measurement of the near-thresholde+e−→DD¯cross section using initial-state radiation

Author

B. G. Cheon, K. Kinoshita, D. Liventsev, Stephen L. Olsen, I. Tikhomirov, G. S. Varner, R. Itoh, P. Wang, Yu. V. Usov, A. Chen, V.N. Zhilich, R. Mizuk, H. Shibuya, D. Heffernan, G. R. Moloney, K. Senyo, T. Kawasaki, Yoshinobu Unno, Anton Poluektov, H. Miyata, L. S. Peak, K. Ueno, M. Shapkin, W. A. Mitaroff, O. Zyukova, Zhenyu Zhang, Y. Hoshi, D. Epifanov, V.E. Shebalin, Y. J. Kim, H. Kichimi, S. K. Choi, K. Miyabayashi, H. Ozaki, M. Starič, K. Hayasaka, T. Lesiak, A. Drutskoy, H. Hayashii, H. Sahoo, Youngjoon Kwon, Y. Iwasaki, F. Mandl, Vladimir Zhulanov, K. Tamai, Y. Sakai, R. Pestotnik, T. Sumiyoshi, Takayoshi Ohshima, Vladislav Balagura, Antonio Limosani, U. Bitenc, A. Matyja, S. Ogawa, Joowon Lee, O. Schneider, N. Katayama, L. E. Piilonen, G. Pakhlova, A. Somov, K. Inami, H. J. Hyun, I. Bedny, M. J. Lee, Y. Watanabe, D. H. Kah, M. Bračko, I. Adachi, S. Uno, Y. Miyazaki, B. Shwartz, S. Y. Suzuki, Tatiana Medvedeva, C. H. Wang, Hirokazu Ishino, A. M. Bakich, A. Vinokurova, W. T. Chen, H. Kawai, S. Villa, T. Uglov, Ju Hwan Kang, P. Chang, P. Krokovny, V. M. Aulchenko, N. Gabyshev, A. Kibayashi, S. W. Lin, S. McOnie, Sadaharu Uehara, R. Chistov, A. Ishikawa, A. Bay, T. Nozaki, F. Takasaki, C. W. Park, A. J. Schwartz, R. Seidl, Samo Stanič, Andrey Sokolov, H. O. Kim, S. Okuno, Yu-xi Liu, Jasvinder A. Singh, J. Dalseno, S. K. Kim, T. Aushev, Rakesh Kumar, T. E. Browder, Y. Teramoto, Bruce Yabsley, Toru Iijima, M. Danilov, C. C. Kuo, S. Nishida, S. Eidelman, K. Vervink, X. L. Wang, Y. Choi, A.S. Kuzmin, P. Pakhlov, A. Bozek, A. Zupanc, O. Nitoh, Hiroaki Aihara, C. Z. Yuan, A. Bondar, S. Korpar, Jolanta Brodzicka, B. Golob, J. S. Lange, J. G. Shiu, W. S. Hou, K. Arinstein, and Y. Yusa

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Cross section (physics), Range (particle radiation), Positron, Luminosity (scattering theory), Detector, High Energy Physics::Experiment, Electron, Radiation, Energy (signal processing)
Abstract

We report measurements of the exclusive cross section for e+e-→DD, where D=D0 or D+, in the center-of-mass energy range from the DD threshold to 5 GeV with initial-state radiation. The analysis is based on a data sample collected with the Belle detector with an integrated luminosity of 673fb-1. © 2008 The American Physical Society.

Published
2008
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24. Observation of a Near-Threshold Enhancement in thepp¯Mass Spectrum from RadiativeJ/ψ→γpp¯Decays

Author

K. Li, X. L. Luo, L. W. Song, J. Z. Wang, M. H. Ye, Y. C. Zhu, Stephen L. Olsen, R. B. Li, D. P. Jin, N. Wu, P. L. Wang, Meng Wang, J. J. He, L. Y. Dong, D. H. Zhang, Y. Jin, Y. J. Zhang, S. D. Yang, C. S. Yu, Fang Liu, C. F. Liu, Yingchun Zhu, Y. N. Guo, H. Shen, R. Y. Li, J. W. Zhao, Feng Shi, S. T. Xue, G. W. Yu, S. L. Zang, D. X. Zhao, Jing Wang, Y. B. Zhao, S. P. Chi, F. Lu, B. Y. Zhang, Jiemin Li, L. S. Wang, Xintong Li, F. Li, X. X. Xie, F. C. Ma, J. F. Chang, C. D. Qian, S. D. Gu, Guangzhao Zhou, Cunfeng Wei, Ning Zhou, H. Y. Zhang, Liang Huang, Yiyun Zhang, Q. Yue, B. X. Zhang, Q. J. Li, Xingzhu Cui, K. J. Zhu, J. M. Yuan, Yang Tian, Z. P. Zheng, H. S. Chen, G. S. Huang, M. L. Gao, Bing Zhou, Y. X. Ye, Y. Zeng, X. Y. Shen, Z. Zhao, J. F. Qiu, J. W. Zhang, Jie Chen, S. S. Fang, Z. J. Lu, Y. Q. Guo, J. Ying, J. Y. Zhang, Y. B. Chen, Y. B. Liu, J. Nie, Y. F. Lai, H. F. Chen, Yudan Wang, L. P. Zhou, S. Q. Tang, J. G. Bian, Xiru Huang, G. L. Tong, S. X. Du, W. F. Wang, X. C. Meng, G. R. Lu, Z. J. Guo, B. A. Zhuang, H. H. Li, Z. P. Mao, X. Q. Li, Y. K. Heng, Y. Y. Zhang, M. L. Yan, Z. A. Zhu, X. Y. Zhang, G. S. Varner, R. G. Liu, Y. S. Dai, T. Hong, G. Li, C. Z. Yuan, S. Q. Zhang, Zheng Wang, J. B. Liu, F. A. Harris, C. S. Gao, Jinxing Zheng, P. P. Zhao, Jiming Yang, Zhe Wang, C. D. Fu, Y. Z. Sun, X. S. Jiang, W. D. Li, X. Tang, Z. P. Zhang, K. L. He, Chun-Hua Jiang, W. B. Yan, S. W. Han, Qiyang Zhang, Z. Y. Wang, J. M. Zhang, J. C. Chen, Xuanhong Lou, W. H. Toki, Lei Zhang, R. Malchow, Joseph Izen, G. Rong, P. Wang, Zujian Wang, Q. M. Zhu, Y. Yuan, Y. S. Zhu, Y. M. Dai, Jun-Bing Ma, J. Fang, L. S. Zheng, Y. C. Xu, M. Z. Wang, D. Paluselli, W. X. Gong, D. Kong, W. R. Zhao, H. S. Sun, Y. P. Chu, X. B. Ji, F. Liu, M. Y. Gong, Haiping Peng, B.S. Zou, Jiawei Zhao, Y. N. Gao, J. Chen, H. M. Hu, Z. J. Ke, Z. J. Sun, L. P. Fu, Houbing Lu, C. C. Zhang, J. C. Li, H. X. Yang, W. G. Li, H. M. Liu, X. H. Mo, J. G. Lu, T. Hu, XZ（蔡翔舟） Cai, J. P. Liu, G. A. Yang, Z. Z. Du, B. D. Jones, S.S. Sun, X. C. Zhong, Z. X. Liu, W. Dunwoodie, D. Tian, G. F. Xu, S. Jin, H. Y. Sheng, N. D. Qi, Z. A. Liu, Y. Ban, J. Z. Bai, M. He, D. L. Shen, C. X. Liu, X. M. Xia, H. Y. Fu, Z. D. Nie, E. C. Ma, and X. H. He

Subjects
Physics, Nuclear physics, Antiparticle, Particle decay, Mass spectrum, Radiative transfer, General Physics and Astronomy, High Energy Physics::Experiment, Invariant mass, Elementary particle, Atomic physics, Nucleon, Resonance (particle physics)
Abstract

We observe a narrow enhancement near 2m(p) in the invariant mass spectrum of pp pairs from radiative J/psi-->gammapp decays. No similar structure is seen in J/psi-->pi(0)pp decays. The results are based on an analysis of a 58 x 10(6) event sample of J/psi decays accumulated with the BESII detector at the Beijing electron-positron collider. The enhancement can be fit with either an S- or P-wave Breit-Wigner resonance function. In the case of the S-wave fit, the peak mass is below 2m(p) at M=1859(+3)(-10) (stat)+5-25(syst) MeV/c(2) and the total width is Gamma

Published
2003
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25. A Detailed Monte-Carlo Simulation for the Belle TOF System

Author

Youngjoon Kwon, M. D. Jones, G. S. Varner, J. Yashima, J. L. Rodriguez, T. H. Kim, H. Kichimi, N. Gabyshev, M. D. Peters, D. W. Kim, J. W. Nam, B. C. K. Casey, Yong Choi, Yangheng Zheng, Jeong Hwan Kim, J. Zhang, and Stephen L. Olsen

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, Monte Carlo method, Physics::Medical Physics, Readout electronics, FOS: Physical sciences, Time resolution, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Scintillation counter, High Energy Physics::Experiment, Nuclear Experiment, Instrumentation, Beam (structure)
Abstract

We have developed a detailed Monte Carlo simulation program for the Belle TOF system. Based on GEANT simulation, it takes account of all physics processes in the TOF scintillation counters and readout electronics. The simulation reproduces very well the performance of the Belle TOF system, including the dE/dx response, the time walk effect, the time resolution, and the hit efficiency due to beam background. In this report, we will describe the Belle TOF simulation program in detail., To be submitted to NIM

Published
2002

26. Study of the hadronic decays ofχcstates

Author

Q. H. Hu, R. B. Li, P. P. Xie, X. Ju, Dehong Zhang, J. G. Lu, J. Panetta, Y. C. Zhu, P. Q. Li, F. Lu, Y. H. Xie, H. W. Zhao, P. Gratton, X. M. Xia, T. J. Wang, Y. Q. Chen, X. H. Li, P. L. Wang, J. Y. Zhang, D. Li, H. B. Li, T. Hu, B. W. Shen, S. T. Xue, Y. L. Han, W. R. Zhao, Jiawei Zhao, J. W. Zhao, G. Y. Hu, X. Y. Zhang, G. W. Yu, F. A. Harris, R. G. Liu, Xuan Yang, J. P. Liu, C. C. Zhang, Y. Y. Zhang, S. Q. Gao, Z. J. Ke, J. Oyang, Y. J. Sun, S. W. Ye, M. Weaver, C. Y. Yang, G. F. Xu, L. S. Wang, Z. Q. Yu, A. J. Lankford, X. R. Qi, H. Z. Shi, B. Lowery, W. G. Li, X. F. Song, D. G. Hitlin, B. D. Jones, M. H. Ye, H. Shen, Xingzhu Cui, L. Z. Wang, D. M. Xi, J. Yan, M. G. Zhao, Y. H. Qu, M. H. Kelsey, X. Y. Shen, Jiming Yang, X. Q. Hu, Y. X. Ye, Cunfeng Wei, Y. F. Gu, H. M. Liu, C. Z. Yuan, X. C. Meng, J. Standifird, W. G. Yan, Z. G. Zhao, M. He, D. L. Shen, J. W. Zhang, I. Blum, Qiyang Zhang, Michael Schernau, W. Yang, Y. B. Chen, P. F. Lang, S. Q. Tang, Chun-Hua Jiang, Lei Zhang, J. Nie, M. L. Gao, G. P. Chen, J. F. Qiu, Stephen L. Olsen, B. K. Kim, Y. Z. Huang, Joseph Izen, G. Rong, W. D. Li, Y. Y. Shao, C. S. Gao, P. Wang, Jinxing Zheng, Bing Zhou, J. C. Chen, Xuanhong Lou, R. Malchow, D. H. Zhang, Y. Yuan, L. J. Pan, F. C. Porter, Y. H. Yu, Y. S. Zhu, J. C. Li, D. Paluselli, C. S. Yu, D. X. Zhao, B. Y. Zhang, Jiemin Li, Jun-Bing Ma, L. P. Zhou, S. Q. Zhang, Q. M. Zhu, Y. F. Lai, Y. Y. Wang, E. C. Ma, L. S. Zheng, H. F. Chen, F. Wang, H. L. Zhang, Z. P. Mao, W. Dunwoodie, Y. Z. Sun, H. S. Mao, M. Z. Wang, K. L. He, S. W. Han, L. Y. Dong, F. Sun, B. S. Cheng, H. S. Sun, X. N. Li, J. H. Gu, Y. N. Guo, H. S. Zhou, J. G. Bian, J. He, C. M. Yang, Y. Jin, Z. P. Zheng, G. L. Tong, C. D. Qian, B. A. Zhuang, Y. B. Liu, X. L. Luo, J. L. Hu, Y. G. Wu, J. J. He, D. Kong, S. D. Gu, S. M. Wang, G. P. Zhou, G. S. Varner, Cheng-Kui Li, W. X. Gu, W. H. Toki, Y. G. Xie, Y. K. Que, J. Chen, H. M. Hu, K. J. Zhu, H. L. Ding, H. Y. Sheng, C. X. Yu, N. D. Qi, Y. Ban, J. Z. Bai, and Z. Z. Du

Subjects
Combinatorics, Nuclear physics, Physics, High Energy Physics - Phenomenology, Nuclear and High Energy Physics, Hadron, High Energy Physics - Experiment
Abstract

Hadronic decays of the P-wave spin-triplet charmonium states \chi_cJ (J=0,1,2) are studied using a sample of \psi(2S) decays collected by the BES detector operating at the BEPC storage ring. Branching fractions for the decays \chi_c1 going to K_s^0 K^+ \pi^- + c.c., \chi_c0 going to K_s^0 K_s^0, \chi_c2 going to K_s^0 K_s^0, \chi_c0 going to \phi \phi, \chi_c2 going to \phi \phi and \chi_cJ going to K^+ K^- K^+ K^- are measured for the first time, and those for \chi_cJ going to \pi^+ \pi^- \pi^+ \pi^-, $ \chi_cJ going to \pi^+ \pi^- K^+ K^-, \chi_cJ going to \pi^+ \pi^- p \bar{p} and \chi_cJ going to 3(\pi^+ \pi^-) are measured with improved precision. In addition, we determine the masses of the \chi_c0 and \eta_c to be M_{\chi_{c0}}=3414.1 \pm 0.6(stat) \pm 0.8 (sys) MeV and M_{\eta_c}=2975.8 \pm 3.9(stat) \pm 1.2 (sys) MeV., Comment: 24 pages, 12 figures, 6 tables, use revtex, submitted to Phys. Rev. D

Published
1999
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27. A Review of Charmed Particle Production in Hadronic Collisions

Author

Stephen L. Olsen

Subjects
Semileptonic decay, Physics, Large Hadron Collider, Muon, Meson, Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, Hadron, Baryon, Nuclear physics, Cross section (physics), Physics::Accelerator Physics, High Energy Physics::Experiment, Fermilab, Nuclear Experiment
Abstract

A review of recent experimental results on the production of Charmed Particles in hadronic collisions is reported. Comparisons with theoretical predictions are made. Results from Neutrino beam dump experiments at the CERN SPS and direct muon production at Fermilab indicate that central production of Charmed mesons occurs with a total cross section of 10 to 20 microbarns. Charmed mesons and Baryons have also been observed at the CERN ISR with cross sections that appear to be considerably larger. Some recent experimental limits on the production of B particles are also reviewed.

Published
1980
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