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27 results on '"K. P. Hu"'

1. Cross-feeding promotes heterogeneity within yeast cell populations

Author

Kevin K. Y. Hu, Ankita Suri, Geoff Dumsday, and Victoria S. Haritos

Subjects
Science
Abstract

Abstract Cellular heterogeneity in cell populations of isogenic origin is driven by intrinsic factors such as stochastic gene expression, as well as external factors like nutrient availability and interactions with neighbouring cells. Heterogeneity promotes population fitness and thus has important implications in antimicrobial and anticancer treatments, where stress tolerance plays a significant role. Here, we study plasmid retention dynamics within a population of plasmid-complemented ura3∆0 yeast cells, and show that the exchange of complementary metabolites between plasmid-carrying prototrophs and plasmid-free auxotrophs allows the latter to survive and proliferate in selective environments. This process also affects plasmid copy number in plasmid-carrying prototrophs, further promoting cellular functional heterogeneity. Finally, we show that targeted genetic engineering can be used to suppress cross-feeding and reduce the frequency of plasmid-free auxotrophs, or to exploit it for intentional population diversification and division of labour in co-culture systems.

Published
2024
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2. Observation of Gamma Rays up to 320 TeV from the Middle-aged TeV Pulsar Wind Nebula HESS J1849−000

Author

M. Amenomori, S. Asano, Y. W. Bao, X. J. Bi, D. Chen, T. L. Chen, W. Y. Chen, Xu Chen, Y. Chen, Cirennima, S. W. Cui, Danzengluobu, L. K. Ding, J. H. Fang, K. Fang, C. F. Feng, Zhaoyang Feng, Z. Y. Feng, Qi Gao, A. Gomi, Q. B. Gou, Y. Q. Guo, Y. Y. Guo, Y. Hayashi, H. H. He, Z. T. He, K. Hibino, N. Hotta, Haibing Hu, H. B. Hu, K. Y. Hu, J. Huang, H. Y. Jia, L. Jiang, P. Jiang, H. B. Jin, K. Kasahara, Y. Katayose, C. Kato, S. Kato, I. Kawahara, T. Kawashima, K. Kawata, M. Kozai, D. Kurashige, Labaciren, G. M. Le, A. F. Li, H. J. Li, W. J. Li, Y. Li, Y. H. Lin, B. Liu, C. Liu, J. S. Liu, L. Y. Liu, M. Y. Liu, W. Liu, H. Lu, X. R. Meng, Y. Meng, K. Munakata, K. Nagaya, Y. Nakamura, Y. Nakazawa, H. Nanjo, C. C. Ning, M. Nishizawa, R. Noguchi, M. Ohnishi, S. Okukawa, S. Ozawa, X. Qian, X. L. Qian, X. B. Qu, T. Saito, Y. Sakakibara, M. Sakata, T. Sako, T. K. Sako, T. Sasaki, J. Shao, M. Shibata, A. Shiomi, H. Sugimoto, W. Takano, M. Takita, Y. H. Tan, N. Tateyama, S. Torii, H. Tsuchiya, S. Udo, H. Wang, S. F. Wang, Y. P. Wang, Wangdui, H. R. Wu, Q. Wu, J. L. Xu, L. Xue, Z. Yang, Y. Q. Yao, J. Yin, Y. Yokoe, Y. L. Yu, A. F. Yuan, L. M. Zhai, H. M. Zhang, J. L. Zhang, X. Zhang, X. Y. Zhang, Y. Zhang, Yi Zhang, Ying Zhang, S. P. Zhao, Zhaxisangzhu, X. X. Zhou, and Y. H. Zou

Subjects
Galactic cosmic rays, Pulsar wind nebulae, Gamma-ray sources, Gamma-ray astronomy, Gamma-ray observatories, Astrophysics, QB460-466
Abstract

Gamma rays from HESS J1849−000, a middle-aged TeV pulsar wind nebula (PWN), are observed by the Tibet air shower array and the muon detector array. The detection significance of gamma rays reaches 4.0 σ and 4.4 σ levels above 25 TeV and 100 TeV, respectively, in units of the Gaussian standard deviation σ . The energy spectrum measured between 40 TeV < E < 320 TeV for the first time is described with a simple power-law function of ${dN}/{dE}={(2.86\pm 1.44)\times {10}^{-16}(E/40\,\mathrm{TeV})}^{-2.24\pm 0.41}\,{\mathrm{TeV}}^{-1}\,{\mathrm{cm}}^{-2}\,{{\rm{s}}}^{-1}$ . The gamma-ray energy spectrum from the sub-TeV ( E < 1 TeV) to sub-PeV (100 TeV < E < 1 PeV) ranges, including the results of previous studies, can be modeled with the leptonic scenario, i.e., inverse Compton scattering by high-energy electrons accelerated by the PWN of PSR J1849−0001. On the other hand, the gamma-ray energy spectrum can also be modeled with the hadronic scenario in which gamma rays are generated from the decay of neutral pions produced by collisions between accelerated cosmic-ray protons and the ambient molecular cloud found in the gamma-ray-emitting region. The cutoff energy of cosmic-ray protons E _p,cut is estimated as ${\mathrm{log}}_{10}({E}_{{\rm{p}},\mathrm{cut}}/\mathrm{TeV})={3.73}_{-0.66}^{+2.98}$ , suggesting that protons are accelerated up to the PeV energy range. Our study thus proposes that HESS J1849−000 should be further investigated as a new candidate as a Galactic PeV cosmic-ray accelerator, or “PeVatron.”

Published
2023
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3. Sulfur dioxide acts as an antioxidant and delays programmed cell death in wheat aleurone layers upstream of H2S and NO signaling pathways

Author

K.-K. Sun, D.-B. Zhu, G.-F. Yao, K.-D. Hu, and H. Zhang

Subjects
ascorbate peroxidase, catalase, gibberellic acid, protein storage vacuoles, guaiacol peroxidase, reactive oxygen species, superoxide dismutase, Biology (General), QH301-705.5, Plant ecology, QK900-989
Abstract

Sulfur dioxide is a widespread air pollutant and it also acts as a signaling molecule in various processes in mammals. However, the role of SO2 in programmed cell death (PCD) in plants is unclear. Here we studied the role of SO2 in gibberellin (GA)-treated wheat aleurone layers. The results showed that 100 μM SO2 donor (NaHSO3/Na2SO3) could effectively delay PCD and inhibit the coalescence of small protein storage vacuoles (PSVs) in aleurone cells treated with GA. Also, SO2 could reduce the accumulation of hydrogen peroxide and superoxide anion in GA-treated aleurone layers. In this process, SO2 could sustain higher activities of catalase, guaiacol peroxidase, ascorbate peroxidase, and superoxide dismutase and lower activities of lipoxygenase and polyphenol oxidase by comparing with GA alone. In addition, an induction of endogenous H2S and NO was observed in SO2-treated aleurone layers. The application of NO scavenger cPTIO could accelerate PCD in SO2 or H2S treated aleurone cells, suggesting that NO alleviated PCD by acting downstream of SO2 and H2S. In conclusion, these results imply that SO2 could delay PCD in GA-treated wheat aleurone layers by enhancing cellular antioxidative capacity and H2S/NO signals act downstream of SO2.

Published
2018
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4. Effects of recrystallization annealing on microstructure and mechanical properties of low-carbon air-hardening steel LH800

Author

X Luo, Z L Mi, Y X Wu, H T Jiang, and K H Hu

Subjects
air-hardening steel LH800, batch annealing, bimodal microstructure, recrystallization kinetics, yield plateau, Materials of engineering and construction. Mechanics of materials, TA401-492, Chemical technology, TP1-1185
Abstract

The process of recrystallization annealingaffects grain size and morphology, and thus, plays a vital role in tailoring the mechanical properties of the air-hardening steel LH800. In this paper, we investigated the recrystallization behavior, microstructure evolution, and mechanical properties of cold-rolled LH800 steel during the batch annealing process. We also studied the relationship between the recrystallization behavior and the microstructure as well as the mechanical properties, in obtaining air-hardening steel with good cold formability. The results show that when annealing at 700 °C with extended holding time, the cold-rolled deformed structure recrystallizes gradually, a large number of nanoscale carbides are formed and dispersed in the matrix, and the bimodal microstructure of the coarse and fine grain ferrite is distributed in lamellae along the rolling direction. With an increase in holding time, the volume fraction of nano carbide decreases, bimodal structure disappears gradually, and the ferrite grain size tends to be uniform. The air-hardening steel LH800 has lower yield strength, highest elongation, and best cold forming performance when annealed at 700 °C for 4 h. The essence of the yield point elongation of the LH800 during tensile testing is revealed, based on the evolution of recrystallized microstructure and the change of nano-scale carbides in the ferrite matrix during the annealing process.

Published
2021
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5. Stomatal closure in sweet potato leaves induced by sulfur dioxide involves H2S and NO signaling pathways

Author

K. -D. Hu, J. Tang, D. -L. Zhao, L. -Y. Hu, Y. -H. Li, Y. -S. Liu, R. Jones, and H. Zhang

Subjects
abscisic acid, gaseous signals, sulfur metabolism, Biology (General), QH301-705.5, Plant ecology, QK900-989
Abstract

Sulfur dioxide (SO2) is a well-known and widespread air pollutant but it also acts as signaling molecule in various processes in animals. However, there is limited information on the role of SO2 in plants except of its toxicity. Here we studied the role of SO2 on stomatal movements in sweet potato (Ipomoea batatas) leaves. SO2, generated by Na2SO3/NaHSO3 solutions, was applied on epidermal strips. We found that the SO2 donor induced stomatal closure in a dose-dependent manner. Rapid increases in endogenous hydrogen sulfide and nitric oxide content levels were observed in leaves after the treatment with the SO2 donor. The SO2-induced stomatal closure was reversed by the H2S scavenger hypotaurine and the NO-specific scavenger cPTIO. Our results indicate that the SO2-induced stomatal closure was likely mediated by the H2S and NO signaling pathways.

Published
2014
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6. Characteristics of damage to buildings by debris flows on 7 August 2010 in Zhouqu, Western China

Author

K. H. Hu, P. Cui, and J. Q. Zhang

Subjects
Environmental technology. Sanitary engineering, TD1-1066, Geography. Anthropology. Recreation, Environmental sciences, GE1-350, Geology, QE1-996.5
Abstract

A debris-flow catastrophe hit the city of Zhouqu, Gansu Province, western China, at midnight on 7 August 2010 following a local extreme rainfall of 77.3 mm h−1 in the Sanyanyu and Luojiayu ravines, which are located to the north of the urban area. Eight buildings damaged in the event were investigated in detail to study the characteristics and patterns of damage to buildings by debris flows. It was found that major structural damage was caused by the frontal impact of proximal debris flows, while non-structural damage was caused by lateral accumulation and abrasion of sediment. The impact had a boundary decreasing effect when debris flows encountered a series of obstacles, and the inter-positioning of buildings produced so-called back shielding effects on the damage. Impact, accumulation, and abrasion were the three main patterns of damage to buildings in this event. The damage scale depended not only on the flow properties, such as density, velocity, and depth, but also on the structural strength of buildings, material, orientation, and geometry. Reinforced concrete-framed structures can effectively resist a much higher debris-flow impact than brick-concrete structures. With respect to the two typical types of structure, a classification scheme to assess building damage is proposed by referring to the Chinese Classification System of Earthquake Damage to Buildings. Furthermore, three damage scales (major structural, minor structural, and non-structural damage) are defined by critical values of impact pressure. Finally, five countermeasures for effectively mitigating the damage are proposed according to the on-site investigation.

Published
2012
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7. Thermodynamics and kinetics of the hydrolysis of atmospherically relevant organonitrates and organosulfates

Author

K. S. Hu, A. I. Darer, and M. J. Elrod

Subjects
Physics, QC1-999, Chemistry, QD1-999
Abstract

The presence of alcohol, organonitrate, and organosulfate species related to the gaseous precursor isoprene in ambient secondary organic aerosol (SOA) has stimulated investigations of the nature of SOA-phase chemical processing. Recent work has suggested that certain isoprene-derived organonitrates are able to efficiently convert to organosulfates and alcohols on ambient SOA. In order to better understand the structure activity relationships previously observed for the isoprene-derived organonitrates and organosulfates, the hydrolysis reactions of a number of monofunctional and difunctional organonitrates and organosulfates with varying carbon substitution properties were investigated. Nuclear magnetic resonance techniques were used to study the bulk phase aqueous reactions of these organonitrates and organosulfates in order to determine hydrolysis reaction rate and, in some cases, thermodynamics information. Electronic structure calculations were also carried out to determine the enthalpy of hydrolysis for these species, and for the previously studied isoprene-derived species. The results suggest that while organonitrates and organosulfates are thermodynamically unstable with respect to the corresponding alcohols at standard state, only the tertiary organonitrates (and perhaps some tertiary organosulfates) are able to efficiently hydrolyze on SOA timescales and acidities.

Published
2011
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8. Hydrogen sulfide alleviated chromium toxicity in wheat

Author

H. Zhang, L. -Y. Hu, P. Li, K. -D. Hu, C. -X. Jiang, and J. -P. Luo

Subjects
amylase, antioxidative enzymes, esterase, lipid peroxidation, seed germination, triticum aestivum, Biology (General), QH301-705.5, Plant ecology, QK900-989
Abstract

Effects of H2S on seed germination under chromium (Cr) stress were investigated in wheat (Triticum aestivum L.). Under Cr stress, the percentage of germination of wheat seeds decreased, but this decrease could be alleviated by pretreatment with NaHS, an H2S donor, in a dose-dependent manner. Furthermore, NaHS significantly enhanced the activities of amylase, esterase, superoxide dismutase, catalase, ascorbate peroxidase, and guaiacol peroxidase in Cr-stressed germinating seeds, whereas reduced the Cr-induced increase in lipoxygenase activity and over-production of malondialdehyde (MDA) and H2O2, and sustained slightly higher content of endogenous H2S.

Published
2010
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9. An eligible biological allograft patch in tension-free herniorrhaphy of swine

Author

M H, Deng, Y S, Zhong, J, Yan, K P, Hu, Z C, Yao, C, Chen, and G F, Xu

Subjects
CD4-Positive T-Lymphocytes, Swine, Tumor Necrosis Factor-alpha, Tensile Strength, Interleukin-1beta, Animals, Biocompatible Materials, Female, CD8-Positive T-Lymphocytes, Surgical Mesh, Herniorrhaphy
Abstract

Current patches made from macromolecular compounds or composix for tension-free herniorrhaphy are still unsatisfactory in biocompatibility. The ideal patch should be a biological patch with good biocompatibility. Herein allograft patches modified by tissue engineering were used in tension-free herniorrhaphy of swines. Tough membrane tissues from swine were modified with patented tissue engineering techniques to develop allograft patches for tension-free herniorrhaphy. Histological, and physical tests of the allograft patch were performed subsequently, which revealed that the allograft patch was sufficient and satisfactory for tension-free herniorrhaphy. The allograft patches were next used in tension-free herniorrhaphy of abdominal external hernia models of swines and compared to polypropylene patches. Serous CD4+, CD8+ T cells, interleukin-1β (IL-1β), and tumor necrosis factor α (TNF-α) were determined preoperatively and postoperatively. Local pathological changes were recorded postoperatively in swines. In vivo application of the allograft patches revealed that there were no significant serous cellular immune responses in swines, and inflammation induced by allograft patches was significantly lower compared to polypropylene patches, the allograft patches gradually degenerated and new collagen fibers appeared. Abdominal external hernias were cured with allograft patches and without relapse. The modified allograft patch with satisfactory biocompatibility was eligible and sufficient in tension-free herniorrhaphy of swine. Clinical trials should be performed for further evaluation of the allograft patch.

Published
2013

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

Author

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

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

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

Published
1992

11. SEARCH FOR CHARGED HEAVY LEPTONS WITH ARBITRARY NEUTRINO MASSES IN e+e− ANNIHILATIONS AT $\sqrt{s} = 50 - 60.8~{\rm GeV}$

Author

Richard Breedon, M. H. Ye, Hiroyuki Sagawa, H. Miyata, J. Vinson, S. Lusin, W. Metcalf, K. Gotow, C. G. Trahern, T. Kumita, David Stuart, Takashi Sasaki, H. S. Budd, Kazuo Abe, C. Rosenfeld, Y. C. Zhu, S. L. Olsen, A. Sill, D. Perticone, F. Sannes, Y. Fujii, J. S. Kang, Y. Sugimoto, T. Mori, R. R. McNeil, Kaori Maeshima, K. Ohta, K. P. Hu, Winston Ko, K. Ueno, F. Kajino, Yasuo Higashi, M. H. Lee, R. Tanaka, E. J. Kim, E. H. Thorndike, J. Lim, G. N. Kim, S. Kobayashi, Robert Stone, J. Li, D. Blanis, Y. Sakai, Y. H. Ho, S.K. Kim, N. M. Shaw, Tsunehiko Omori, P. Gu, I. H. Park, S. Matsumoto, J. Liu, T. Nozaki, R. L. Malchow, P. Auchincloss, K. L. Sterner, Bj Kim, R. L. Imlay, D. H. Han, Yongsun Kim, J. Rowe, T. Ishizuka, R. D. Kass, K. Tomioka, A. Maki, C. P. Cheng, A. Bodek, C. A. Fry, S. S. Myung, H. W. Zheng, R. C. Walker, A. Bacala, Steve Schnetzer, H. Harada, Y. Takaiwa, Dong-Chul Son, H. Kagan, C. Velissaris, M. E. Mattson, A. Abashian, Y. Ishi, Yoshimasa Kurihara, E. H. Low, S. Wilson, P. N. Kirk, R. L. Lander, Y. Yamashita, Y. K. Li, A. Murakami, M. Frautschi, R. Poling, Kazumasa Miyano, Sarah Catherine Eno, Susumu Terada, T. Thomas, A. T.M. Wang, J. R. Smith, Hyunyong Kim, and L. E. Piilonen

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, High Energy Physics::Phenomenology, Hadron, Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics, Massless particle, Nuclear physics, Pair production, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Lepton
Abstract

Results of a search for the pair production of charged heavy leptons in e+e− annihilations over the center-of-mass energy range of 50 to 60.8 GeV are reported. We assume that the leptons are of the sequential type but have allowed for the case where the associated neutrino might be massive. Separate searches for evidence for decays to hadronic and leptonic final states, searches specialized for the case where the charged lepton and its associated neutrino are close in mass, and a search for stable heavy leptons have uncovered no evidence for the production of such particles at these energies. Mass limits for heavy leptons and their associated neutrinos are determined for a range of hadronic and leptonic decay branching fractions. A sequential charged heavy lepton with mass between 12.6 and 29.6 GeV/c2 and with massless neutrino is excluded at the 95% confidence level.

Published
1991

12. A measurement of the photon structure function F2

Author

J. Rowe, A. Bodek, Richard Breedon, T. Kumita, Y. Sugimoto, E. H. Low, Robert Stone, David Stuart, S. Kanda, M. E. Mattson, T. Nozaki, H. Kagan, J. S. Kang, Y. Ishi, C. Velisarris, E. J. Kim, Takashi Sasaki, Kazumasa Miyano, A. Murakami, Yusuke Higashi, K. Ueno, J. Vinson, L. E. Piilonen, J. R. Smith, P. N. Kirk, T. Kojima, T. Yasuda, Y. C. Zhu, Y. Yamashita, Kazuo Abe, S. L. Olsen, C. A. Fry, K. Gotow, S. K. Choi, M. H. Ye, N. M. Shaw, R. L. Malchow, H. Miyata, E. H. Thorndike, Hiroyuki Sagawa, C. P. Cheng, J. Lim, Kaori Maeshima, Yongsun Kim, A. T.M. Wang, M. Frautschi, W. Metcalf, Y. Yamagishi, H. Harada, R. D. Kass, B. J. Kim, Y. Takaiwa, Sarah Catherine Eno, P. Gu, Susumu Terada, A. Bacala, H. S. Budd, C. Rosenfeld, T. Ishizuka, A. Sill, R. L. Lander, Dong-Chul Son, Tsunehiko Omori, Yoshimasa Kurihara, S. Matsumoto, S. S. Myung, H. W. Zheng, Moo Hyun Lee, K. Ohta, S. Schenetzer, Winston Ko, P. Auchincloss, S. Kobayashi, F. Sannes, Y. H. Ho, Hyunyong Kim, K. P. Hu, D. H. Han, A. Maki, G. N. Kim, Y. K. Li, S. Lusin, S. Wilson, R. Poling, R. C. Walker, D. Blanis, R. Tanaka, K. L. Sterner, A. Z. Lai, Rr Mcneil, S. K. Kim, F. Kajino, Y. Fujii, Y. Sakai, T. Thomas, and A. Abashian

Subjects
Quantum chromodynamics, Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Structure function, Range (statistics), High Energy Physics::Experiment, Photon structure function
Abstract

The photon structure function F2 has been measured at average Q2 values of 73,160 and 390 ( GeV c ) 2 . We compare the x dependence of the Q2 = 73 ( GeV c ) 2 data with theoretical expectations based on QCD. In addition we present results on the Q2 evolution of the structure function for the intermediate x range (0.3⩽ x ⩽0.8). The results are consistent with QCD.

Published
1990

13. Measurements ofRfore+e−annihilation at the KEK collider TRISTAN

Author

M. Frautschi, Y. Sakai, M. H. Ye, Y. Fujii, Hiroyuki Sagawa, Y. K. Li, D. H. Han, E. H. Thorndike, T. Mori, D. Perticone, J. Lim, R. Poling, Y. Sugimoto, J. Li, A. Bacala, Yoshimasa Kurihara, W. Metcalf, Robert Stone, Rr Mcneil, T. Nozaki, J. S. Kang, L. E. Piilonen, E. H. Low, E. J. Kim, C. G. Trahern, A. Murakami, H. S. Budd, Takashi Sasaki, T. Kumita, S. K. Kim, R. C. Walker, Steve Schnetzer, K. Ueno, A. Abashian, F. Sannes, Kazuo Abe, G. N. Kim, Kaori Maeshima, K. P. Hu, C. P. Cheng, Y. Yamagishi, R. L. Malchow, F. Kajino, R. Tanaka, C. A. Fry, Yongsun Kim, P. Gu, R. L. Lander, T. Kojima, A. Sill, H. Kagan, R. Imlay, R. D. Kass, M. H. Lee, T. Yasuda, K. Ohta, Winston Ko, N. M. Shaw, A. Maki, Richard Breedon, K. Gotow, Kazumasa Miyano, S. Kobayashi, David Stuart, S. Lusin, S. Matsumoto, Y. H. Ho, D. Blanis, S. Wilson, Y. Takaiwa, J. Vinson, A. Bodek, Hyunyong Kim, Dong-Chul Son, Sarah Catherine Eno, I. H. Park, Susumu Terada, J. Liu, Yusuke Higashi, Y. C. Zhu, K. L. Sterner, H. Harada, S. L. Olsen, T. Ishizuka, P. Auchincloss, S. S. Myung, H. W. Zheng, T. Thomas, M. E. Mattson, Y. Ishi, P. N. Kirk, Y. Yamashita, A. T.M. Wang, J. R. Smith, Tsunehiko Omori, C. Rosenfeld, and H. Miyata

Subjects
Nuclear physics, Physics, Particle physics, Antiparticle, Muon, Annihilation, Pair production, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Antimatter, Electron–positron annihilation, Hadron, Elementary particle
Abstract

The ratio {ital R} of the total cross section for {ital e}{sup +}{ital e}{sup {minus}} annihilation into hadrons to the lowest-order QED cross section for {ital e}{sup +}{ital e}{sup {minus}}{r arrow}{mu}{sup +}{mu}{sup {minus}} has been measured for center-of-mass energies ranging from 50 to 61.4 GeV. If we allow for an overall shift of {minus}4.9%, about 1.5 times our estimated normalization error, the results are consistent with the standard-model predictions.

Published
1990

14. Observation of anomalous production of muon pairs in e+e− annihilation into four-lepton final states

Author

S. S. Myung, H. W. Zheng, H. Kagan, M. H. Ye, Rr Mcneil, E. H. Thorndike, J. Lim, A. Maki, M. E. Mattson, A. Bodek, C. A. Fry, Gordon Watts, S. K. Kim, Y. Ishi, R. C. Walker, Steve Schnetzer, Tsunehiko Omori, D. H. Han, P. Gu, H. Ichinose, Hiroyuki Sagawa, F. Kajino, Y. Sakai, M. Dickson, S. Lusin, T. Thomas, Yoshimasa Kurihara, Kazuo Abe, J. Li, David Stuart, P. N. Kirk, T. Nozaki, R. L. Malchow, C. Velissaris, Yasuhiro Sugimoto, L. E. Piilonen, W. Metcalf, N. M. Shaw, Yongsun Kim, Kaori Maeshima, Y. Yamashita, E. J. Kim, H. S. Budd, Y. Yamagishi, C. P. Cheng, M. Frautschi, R. D. Kass, R. Tanaka, Y. Takaiwa, Takashi Sasaki, Y. C. Zhu, H. Miyata, S. L. Olsen, Hyunyong Kim, E. H. Low, G. N. Kim, A. Bacala, Dong-Chul Son, M. H. Lee, F. Sannes, A. Sill, A. Murakami, K. P. Hu, Y. Fujii, S. Wilson, D. Blanis, K. Ohta, A. Abashian, T. Kojima, J. R. Smith, Winston Ko, Yusuke Higashi, S. Matsumoto, T. Yasuda, S. Kobayashi, Y. H. Ho, R. Imlay, K. Gotow, K. L. Sterner, C. Rosenfeld, A. T.M. Wang, T. Mori, C. G. Trahern, T. Kumita, Kazumasa Miyano, Sarah Catherine Eno, Susumu Terada, B. J. Kim, Y. K. Li, R. Poling, R. L. Lander, Robert Stone, H. Harada, P. Auchincloss, Richard Breedon, J. Vinson, D. Perticone, J. S. Kang, K. Ueno, I. H. Park, J. Liu, and T. Ishizuka

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Muon, Electron–positron annihilation, Bremsstrahlung, law.invention, Nuclear physics, Angular distribution, law, Beam direction, High Energy Physics::Experiment, Nuclear Experiment, Collider, Lepton
Abstract

We report results of a study of four-lepton final states produced in e+e− collisions at center-of-mass energies from 50 to 61.4 GeV using the AMY detector at the TRISTAN collider. For the cases where two or three charged tracks are produced at large angles relative to the beam direction, the cross sections agree with QED. However, we observe an excess of e+e−→e+e−μ+μ− events with four tracks at wide angles and with dimuon mass less than 1.0 GeV/c2.

Published
1990

15. Multihadron-event properties ine+e−annihilation ats=52−57GeV

Author

R. Tanaka, M. Frautschi, H. Miyata, A. Abashian, Takashi Sasaki, J. Li, M. H. Lee, L. E. Piilonen, Y. Sakai, W. Metcalf, H. Kagan, N. M. Shaw, T. Mori, I. H. Park, R. R. McNeil, P. Auchincloss, J. Liu, S. Wilson, R. L. Imlay, T. Ishizuka, S. Lusin, D. Perticone, Hiroyuki Sagawa, C. A. Fry, S. Matsumoto, Kazumasa Miyano, J. S. Kang, A. Bodek, T. Kojima, C. P. Cheng, T. Yasuda, Y. Takaiwa, K. Ueno, E. H. Low, Yasuhiro Sugimoto, Tsunehiko Omori, R. C. Walker, S. Kobayashi, F. Sannes, A. Maki, K. Gotow, Y. Fujii, Steve Schnetzer, C. G. Trahern, Dong-Chul Son, Kazuo Abe, T. Kumita, Robert Stone, T. Nozaki, K. P. Hu, Hyunyong Kim, Richard Breedon, H. S. Budd, G. N. Kim, S. S. Myung, H. W. Zheng, Sarah Catherine Eno, Susumu Terada, R. L. Lander, Kaori Maeshima, J. Vinson, E. J. Kim, Y. Yamagishi, M. H. Ye, H. Harada, Yoshimasa Kurihara, J. R. Smith, T. Thomas, D. H. Han, Yusuke Higashi, Y. K. Li, A. Murakami, R. Poling, M. E. Mattson, A. Sill, A. T.M. Wang, K. Ohta, Winston Ko, Y. Ishi, P. N. Kirk, Y. H. Ho, Y. Yamashita, D. Blanis, A. Bacala, K. L. Sterner, S. K. Kim, R. L. Malchow, F. Kajino, Yongsun Kim, R. D. Kass, E. H. Thorndike, J. Lim, P. Gu, David Stuart, Y. C. Zhu, S. L. Olsen, and C. Rosenfeld

Subjects
Quantum chromodynamics, Astroparticle physics, Physics, Particle physics, Annihilation, High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment, Parton, Elementary particle, Quantum field theory, Nuclear Experiment, Hadronization
Abstract

We present the general properties of multihadron final states produced by {ital e}{sup +}{ital e}{sup {minus}} annihilation at center-of-mass energies from 52 to 57 GeV in the AMY detector at the KEK collider TRISTAN. Global shape, inclusive charged-particle, and particle-flow distributions are presented. Our measurements are compared with QCD+fragmentation models that use either leading-logarithmic parton-shower evolution or QCD matrix elements at the parton level, and either string or cluster fragmentation for hadronization.

Published
1990

16. A search for leptoquark and colored lepton pair production in e+e− annihilations at TRISTAN

Author

E. H. Thorndike, Y. Sugimoto, P. Auchincloss, J. Lim, T. Nozaki, A. T.M. Wang, J. R. Smith, P. Gu, Hyunyong Kim, M. H. Lee, C. Rosenfeld, W. Metcalf, T. Kojima, I. H. Park, T. Yasuda, Y. Fujii, E. J. Kim, Dong-Chul Son, S. Wilson, David Stuart, J. Liu, F. Sannes, Takashi Sasaki, K. Gotow, K. P. Hu, T. Ishizuka, P. N. Kirk, R. Imlay, M. Frautschi, Tsunehiko Omori, Y. K. Li, A. Bacala, R. R. McNeill, S. K. Kim, Y. Yamashita, Yusuke Higashi, Y. C. Zhu, S. L. Olsen, D. H. Han, Richard Breedon, G. N. Kim, S. Matsumoto, A. Maki, N. M. Shaw, R. Poling, T. Mori, F. Kajino, C. A. Fry, D. Perticone, Y. Sakai, M. H. Ye, A. Abashian, J. S. Kang, M. E. Mattson, J. Vinson, J. Li, R. L. Lander, L. E. Piilonen, R. L. Malchow, Y. Ishi, R. Tanaka, K. Ueno, Y. Takaiwa, C. G. Trahern, E. H. Low, Robert Stone, S. Lusin, T. Kumita, R. D. Kass, T. Thomas, A. Murakami, C. P. Cheng, Hiroyuki Sagawa, A. Sill, R. C. Walker, Steve Schnetzer, Yk Kim, K. Ohta, D. Blanis, Winston Ko, H. Miyata, Kazuo Abe, S. Kobayashi, Kazumasa Miyano, Kaori Maeshima, Yoshimasa Kurihara, H. S. Budd, Y. Yamagishi, K. L. Sterner, Sarah Catherine Eno, Susumu Terada, H. Harada, H. Kagan, A. Bodek, S. S. Myung, and H. W. Zheng

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Pair production, Colored, Electron–positron annihilation, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Leptoquark, Lepton
Abstract

We report on a search for the pair production of leptoquarks and colored leptons in e + e − annihilations t center-of-mass energies from 50 to 60.8 GeV, using the AMY detector at TRISTAN. No evidence for such particles is found and 95% CL mass limits are given.

Published
1990

17. Forward-backward charge asymmetry ine+e−→hadron jets

Author

D. Stuart, R. E. Breedon, G. N. Kim, Winston Ko, R. L. Lander, K. Maeshima, R. L. Malchow, J. R. Smith, R. Imlay, P. Kirk, J. Lim, R. R. McNeil, W. Metcalf, S. S. Myung, C. P. Cheng, P. Gu, J. Li, Y. K. Li, M. H. Ye, Y. C. Zhu, A. Abashian, K. Gotow, K. P. Hu, E. H. Low, M. E. Mattson, L. Piilonen, K. L. Sterner, S. Lusin, C. Rosenfeld, A. T. M. Wang, S. Wilson, M. Frautschi, H. Kagan, R. Kass, C. G. Trahern, K. Abe, Y. Fujii, Y. Higashi, S. K. Kim, Y. Kurihara, A. Maki, T. Nozaki, T. Omori, H. Sagawa, Y. Sakai, Y. Sugimoto, Y. Takaiwa, S. Terada, R. Walker, F. Kajino, D. Perticone, R. Poling, T. Thomas, Y. Ishi, K. Miyano, H. Miyata, T. Sasaki, Y. Yamashita, A. Bacala, J. Liu, I. H. Park, F. Sannes, S. Schnetzer, R. Stone, J. Vinson, P. Auchincloss, D. Blanis, A. Bodek, H. Budd, S. Eno, C. A. Fry, H. Harada, Y. H. Ho, Y. K. Kim, T. Kumita, T. Mori, S. L. Olsen, N. M. Shaw, A. Sill, E. H. Thorndike, K. Ueno, H. W. Zheng, S. Kobayashi, A. Murakami, J. S. Kang, H. J. Kim, M. H. Lee, D. H. Han, E. J. Kim, D. Son, T. Kojima, S. Matsumoto, R. Tanaka, Y. Yamagishi, T. Yasuda, T. Ishizuka, and K. Ohta (The AMY Collaboration)

Subjects
Quark, Physics, Particle physics, Annihilation, High Energy Physics::Lattice, Computer Science::Information Retrieval, media_common.quotation_subject, High Energy Physics::Phenomenology, Hadron, General Physics and Astronomy, Elementary particle, Charge (physics), Asymmetry, Standard Model, Nuclear physics, High Energy Physics::Experiment, Production (computer science), media_common
Abstract

The forward-backward asymmetry of quarks produced in {ital e}{sup +}{ital e}{sup {minus}} annihilations, summed over all flavors, is measured at {radical}{ital s} between 50 and 60.8 GeV. Methods of determining the charge direction of jet pairs are discussed. The asymmetry is found to agree with the five-flavor standard model.

Published
1990

18. A search for SUSY particles in e +e − annihilations at s=50–60.8GeV

Author

K. Gotow, Y. Fujii, T. Mori, H. Kagan, H. Itoh, Yasuhiro Sugimoto, Y. T. Xu, A. Maki, E. H. Low, C. G. Trahern, T. Kumita, I. H. Park, Tsunehiko Omori, W. Metcalf, S. Matsumoto, Kazuo Abe, Z. P. Mao, S. Lusin, Y. K. Li, T. Ishizuka, J.S. Kang, A. Bacala, M. C.S. Williams, S. Kobayashi, R. C. Walker, M. Frautschi, H. Harada, Kaori Maeshima, Steve Schnetzer, A. T.M. Wang, A. Murakami, D. Perticone, P. Auchincloss, Y. Yamagishi, T. Kojima, S. Wilson, E.J. Kim, R. L. Lander, F. Sannes, G. N. Kim, T. Yasuda, P. N. Kirk, K. Ueno, J. Li, K. P. Hu, A. Bodek, M.H. Lee, Robert Stone, J. R. Smith, Hiroyuki Sagawa, Richard Breedon, Y. Yamashita, R. L. Malchow, Yusuke Higashi, R. L. Imlay, Yongsun Kim, C. P. Cheng, J. Vinson, R. D. Kass, D. Son, M. E. Mattson, N. M. Shaw, Y. Ishi, C. Rosenfeld, H. S. Budd, H. Miyata, Y. Sakai, Ryuki Tanaka, Y. Takaiwa, K. Toyoshima, T. Thomas, S. S. Myung, H. W. Zheng, R. Poling, A. Abashian, Yoshimasa Kurihara, Kazumasa Miyano, Sarah Catherine Eno, Susumu Terada, H. J. Kim, D. Blanis, K. L. Sterner, E. H. Thorndike, J. Lim, D.H. Han, P. Gu, H. Yokota, David Stuart, S. K. Kim, Y. C. Zhu, S. L. Olsen, F. Kajino, R. R. McNeil, A. Sill, C. A. Fry, K. Ohta, Y. H. Ho, L. E. Piilonen, M. H. Ye, KO Winston, T. Nozaki, and Takashi Sasaki

Subjects
Physics, Quark, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, High Energy Physics::Phenomenology, Supersymmetry, lcsh:QC1-999, Nuclear physics, Pair production, Higgs boson, High Energy Physics::Experiment, lcsh:Physics, Lepton
Abstract

Searches for the pair production of the supersymmetric partner particles of leptons, quarks, and non-minimal Higgs have been made in e + e − annihilations at center-of-mass energies between 50 and 60.8 GeV using the AMY detector at TRISTAN. No evidence for their existence is observed and 95% CL mass limits are presented.

Published
1990

19. Studies on conotoxins of Conus betulinus

Author

J S, Chen, C X, Fan, K P, Hu, K H, Wei, and M N, Zhong

Subjects
China, Patch-Clamp Techniques, Potassium Channels, Pyramidal Cells, Molecular Sequence Data, Mollusk Venoms, In Vitro Techniques, Hippocampus, Sodium Channels, Rats, Respiratory Function Tests, Lethal Dose 50, Mice, Animals, Receptors, Cholinergic, Amino Acid Sequence, Conotoxins, Chromatography, High Pressure Liquid
Abstract

The biological activity and toxicity of crude venom from Conus betulinus, which was collected from the South China Sea, were studied. The venom shows Ach receptor activity, K+ current effect, and low toxicity. Four peptide components, named BeTXIa, BeTXIb, BeTXIIa, and BeTXIIb, were purified by gel-filtration with Sephadex followed by HPLC, and finally sequenced on an ABI model 491 sequencer. The low-molecular-weight peptides BeTXIa and b have 14 and 15 amino acid residues, respectively, while BeTXIIa and b have 27 and 30 amino acid residues, respectively. The results indicate that BeTXs from the venom of C. betulinus are a set of small peptides with a high cysteine content like known conotoxins. However, it is meaningful to find that these sequences have specific chemical characteristics in their cysteine framework which differ greatly from known cysteine frameworks in conotoxin structures.

Published
1999

20. Mass limits of charged Higgs boson at largetanβfrome+e−annihilations ats=50−60.8GeV

Author

D. H. Han, A. Sill, K. Ohta, Winston Ko, Y. H. Ho, Robert Stone, Hiroyuki Sagawa, A. Bacala, N. M. Shaw, Dong-Chul Son, C. G. Trahern, T. Kumita, David Stuart, Yusuke Higashi, Y. K. Li, A. Murakami, R. L. Malchow, Y. Takaiwa, H. S. Budd, Yasuhiro Sugimoto, R. C. Walker, Yongsun Kim, R. Poling, Bj Kim, J. Li, P. N. Kirk, T. Kojima, Takashi Sasaki, Y. C. Zhu, R. D. Kass, Steve Schnetzer, S. L. Olsen, T. Yasuda, H. Kagan, R. L. Imlay, Y. Yamashita, Yoshimasa Kurihara, K. Gotow, Y. Fujii, C. P. Cheng, E. H. Thorndike, E. H. Low, J. Lim, M. E. Mattson, Kazumasa Miyano, M. Frautschi, A. Maki, S. Wilson, T. Mori, Kazuo Abe, Y. Ishi, P. Gu, T. Nozaki, Sarah Catherine Eno, Susumu Terada, P. Auchincloss, A. T.M. Wang, E. J. Kim, Kaori Maeshima, Y. Yamagishi, M. H. Ye, M. H. Lee, J. R. Smith, W. Metcalf, S. Matsumoto, F. Sannes, S. S. Myung, H. W. Zheng, R. L. Lander, K. P. Hu, Richard Breedon, J. Vinson, H. Harada, S. K. Kim, J. Rowe, A. Bodek, F. Kajino, C. Velissaris, C. Rosenfeld, R. Tanaka, G. N. Kim, S. Lusin, D. Blanis, I. H. Park, J. Liu, T. Ishizuka, K. L. Sterner, D. Perticone, J. S. Kang, R. R. McNeil, K. Ueno, S. Kobayashi, C. A. Fry, Hyunyong Kim, T. Thomas, A. Abashian, H. Miyata, Y. Sakai, Tsunehiko Omori, and L. E. Piilonen

Subjects
Physics, Antiparticle, Particle decay, Particle physics, Pair production, Computer Science::Information Retrieval, Antimatter, High Energy Physics::Phenomenology, Higgs boson, High Energy Physics::Experiment, Elementary particle, Lepton, Higgs sector
Abstract

A search for the pair production of charged Higgs particles decaying via the {ital H}{sup {minus}}{r arrow}{tau}{bar {nu}} mode has been made in {ital e}{sup +}{ital e}{sup {minus}} annihilations at center-of-mass energies between 50 and 60.8 GeV using the AMY detector at the KEK collider TRISTAN. No evidence for their existence is observed and 95%-C.L. mass limits are presented. The result has been interpreted in terms of the tan{beta} parameter in the Higgs sector.

Published
1990

22. Measurement of e^{+}e^{-}→bb¯ forward-backward charge asymmetry between √s =52 and 57 GeV

Author

C. Rosenfeld, Yasuhiro Sugimoto, Z. P. Mao, M. H. Lee, Takashi Sasaki, S. Wilson, David Stuart, A. Bacala, D. H. Han, G. N. Kim, Robert Stone, H. Harada, K. Gotow, Y. Fujii, S. Matsumoto, D. Blanis, A. Bodek, L. E. Piilonen, J. Li, Y. C. Zhu, S. L. Olsen, H. Kozuka, J. Vinson, K. Toyoshima, P. Perez, H. Kagan, H. W. Zheng, Y. T. Xu, N. M. Shaw, Steve Schnetzer, T. Nozaki, Y. Ishi, Y. K. Li, A. Murakami, R. L. Imlay, E. H. Thorndike, J. Lim, M. E. Mattson, S. S. Myung, Kazuo Abe, K. Ueno, R. Poling, C. P. Cheng, E. J. Kim, P. N. Kirk, P. Gu, K. Ohta, Winston Ko, Dong-Chul Son, Ryuki Tanaka, Kaori Maeshima, Y. Takaiwa, K. L. Sterner, Kazumasa Miyano, K. Sparks, Y. H. Ho, Y. Yamashita, R. L. Malchow, Yongsun Kim, R. D. Kass, Sarah Catherine Eno, Susumu Terada, Yoshimasa Kurihara, Hiroyuki Sagawa, A. Maki, E. H. Low, Alan Sill, H. S. Budd, T. L.T. Thomas, Yusuke Higashi, R. L. Lander, M. Frautschi, Hyunyong Kim, J. R. Smith, A. Abashian, M. C.S. Williams, R. R. McNeil, S. K. Kim, H. Ichinose, F. Kajino, A. T.M. Wang, C. A. Fry, H. Itoh, J. S. Kang, Hideo Yokota, S. Kobayashi, I. H. Park, T. Ishizuka, H. Miyata, Y. Sakai, S. Lusin, D. Perticone, Tsunehiko Omori, T. Mori, C. G. Trahern, T. Kumita, T. Takeda, W. Metcalf, F. Sannes, and K. P. Hu

Subjects
Physics, Particle physics, Annihilation, Pair production, Electron–positron annihilation, Hadron, General Physics and Astronomy, Production (computer science), Charge (physics), Bottom quark, Energy (signal processing)
Abstract

Using 123 multihadronic inclusive muon-production ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$ annihilation events at an average c.m. energy of 55.2 GeV, we extracted the forward-backward charge asymmetry of the ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$\ensuremath{\rightarrow}bb\ifmmode\bar\else\textasciimacron\fi{} process and the R ratio for bb\ifmmode\bar\else\textasciimacron\fi{} production. We used an analysis method in which the behavior of the c quark and lighter quarks is assumed, with only that of the b quark left indeterminate. The results, ${A}_{b}$=-0.72\ifmmode\pm\else\textpm\fi{}0.28(stat)\ifmmode\pm\else\textpm\fi{}0.13(syst) and ${R}_{b}$=0.57\ifmmode\pm\else\textpm\fi{}0.16\ifmmode\pm\else\textpm\fi{}0.10, are consistent with the standard model.

Published
1989

23. Search for unstable heavy neutral leptons ine+e−annihilations at√sfrom 50 to 60.8 GeV

Author

F. Naito, Kazumasa Miyano, K. Sparks, M. C.S. Williams, I. H. Park, K. Eguchi, S. Igarashi, K. Toyoshima, H. Murata, T. Ishizuka, H. Kagan, Y. C. Zhu, S. L. Olsen, L. E. Piilonen, Yusuke Higashi, Sarah Catherine Eno, Susumu Terada, Yasuhiro Sugimoto, R. L. Lander, M. Frautschi, Z. P. Mao, P. N. Kirk, Tsunehiko Omori, K. Gotow, Y. Fujii, E. H. Thorndike, H. Harada, J. Lim, Y. Yamashita, J. S. Kang, A. Abashian, Y. K. Li, A. Murakami, S. S. Myung, K. Hanaoka, Takashi Sasaki, R. L. Malchow, R. Poling, D. Blanis, P. Gu, S. Kobayashi, Yongsun Kim, C. Rosenfeld, K. Ueno, H. Asakura, R. D. Kass, Richard Breedon, H. Miyata, J. Vinson, James C. Green, J. R. Smith, Y. Sakai, H. W. Zheng, K. L. Sterner, K. Ohta, Winston Ko, T. Nozaki, Y. Ishi, Hyunyong Kim, S. Lusin, T. Kojima, R. Chiba, Hiroyuki Sagawa, E. J. Kim, Y. H. Ho, S. K. Kim, Alan Sill, S. Trentalange, D. Perticone, H. Ichinose, F. Kajino, D. H. Han, G. N. Kim, Dong-Chul Son, A. T.M. Wang, N. M. Shaw, H. S. Budd, Hideo Yokota, R. R. McNeil, Kiyosumi Tsuchiya, C. A. Fry, H. Itoh, M. E. Mattson, T. Yasuda, Kazuo Abe, J. Li, R. L. Imlay, A. Bodek, C. P. Cheng, Kaori Maeshima, T. Mori, Y. Yamagishi, Ryuki Tanaka, Y. Takaiwa, R. Coombes, A. Maki, Yoshimasa Kurihara, E. H. Low, R. C. Walker, Steve Schnetzer, T. L.T. Thomas, C. G. Trahern, T. Kumita, M. Ogawa, A. Bacala, Robert Stone, M. H. Lee, S. Matsumoto, W. Metcalf, S. Sakamoto, F. Sannes, K. P. Hu, S. Wilson, and Y. T. Xu

Subjects
Physics, Particle physics, Muon, Annihilation, High Energy Physics::Phenomenology, General Physics and Astronomy, Elementary particle, Fermion, Nuclear physics, Massless particle, High Energy Physics::Experiment, Neutrino, Boson, Lepton
Abstract

A search for unstable heavy neutral leptons has been made at center-of-mass energies from 50 to 60.8 GeV with the AMY detector at the KEK Storage ring TRISTAN. The neutral leptons are assumed to decay via mixing to electrons and muons. Events with two leptons were searched for. No evidence for their existence was found. Limits in the mass range \ensuremath{\le}28.1 GeV/${c}^{2}$ and mixing-parameter range 9\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}10}$\ensuremath{\le}\ensuremath{\Vert}${U}_{\mathrm{lL}}$${\ensuremath{\Vert}}^{2}$\ensuremath{\le}1 are presented for Dirac- and Majorana-type neutrinos.

Published
1989

24. Comparison of quark and gluon jets produced in high-energye+e−annihilations

Author

H. W. Zheng, E. H. Thorndike, J. Lim, W. Metcalf, D. Blanis, H. Miyata, R. R. McNeil, Dong-Chul Son, Y. Ishi, P. Auchincloss, E. J. Kim, K. L. Sterner, Hideo Yokota, K. Toyoshima, C. A. Fry, P. Gu, T. Yasuda, F. Sannes, Takashi Sasaki, H. Itoh, K. P. Hu, A. Bacala, J. Li, S. S. Myung, Robert Stone, Y. Sugimoto, R. L. Imlay, S. Lusin, Y. Sakai, M. C.S. Williams, J. S. Kang, C. P. Cheng, Yusuke Higashi, T. Mori, Kazumasa Miyano, Tsunehiko Omori, P. N. Kirk, S. Wilson, T. Kojima, Hyunyong Kim, K. Ohta, Winston Ko, Sarah Catherine Eno, J. R. Smith, Susumu Terada, Y. Yamashita, S. Kobayashi, Y. Fujii, S. K. Kim, Y. H. Ho, L. E. Piilonen, T. Nozaki, Hiroyuki Sagawa, Yoshimasa Kurihara, F. Kajino, A. Abashian, A. Maki, C. G. Trahern, Alan Sill, David Stuart, T. Kumita, Y. K. Li, A. Murakami, D. H. Han, Z. P. Mao, G. N. Kim, R. Poling, R. L. Malchow, H. S. Budd, R. C. Walker, Richard Breedon, Steve Schnetzer, H. Harada, E. H. Low, M. E. Mattson, Y. C. Zhu, S. L. Olsen, K. Gotow, D. Perticone, Yongsun Kim, J. Vinson, R. D. Kass, Y. T. Xu, T. L.T. Thomas, M. H. Lee, A. T.M. Wang, N. M. Shaw, S. Matsumoto, K. Ueno, I. H. Park, Y. Takaiwa, T. Ishizuka, Kazuo Abe, R. L. Lander, M. Frautschi, Kaori Maeshima, Y. Yamagishi, H. Kagan, C. Rosenfeld, R. Tanaka, and A. Bodek

Subjects
Physics, Quark, Quantum chromodynamics, Particle physics, Annihilation, High Energy Physics::Lattice, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, High Energy Physics::Phenomenology, General Physics and Astronomy, Elementary particle, Parton, Jet (particle physics), Particle identification, Gluon, Nuclear physics, High Energy Physics::Experiment
Abstract

Three-jet events produced in {ital e}{sup +}e{sup {minus}} annihilations are used to provide comparisons between quark and gluon jets. Differences between quark-induced and gluon-induced jets are observed. Quark jets tend to have a more tightly collimated structure than gluon jets, which is reflected in the concentration of a larger fraction of the jet's energy near the jet axis.

Published
1989

25. Search for non-minimal Higgs production in e+e− annihilations at

Author

W. Metcalf, Yusuke Higashi, Robert Stone, M. C.S. Williams, E. H. Thorndike, R. Tanaka, T. Nozaki, E. H. Low, J. Lim, S. Lusin, A. Bacala, T. Thomas, A. Murakami, H. Miyata, Kazuo Abe, M. E. Mattson, F. Sannes, Hiroyuki Sagawa, Y. Ishi, K. P. Hu, P. Gu, Kaori Maeshima, Y. Yamagishi, P. N. Kirk, J. R. Smith, Hyunyong Kim, N. M. Shaw, Y. Yamashita, H. S. Budd, R. L. Malchow, Tsunehiko Omori, D. H. Han, Yongsun Kim, R. D. Kass, G. N. Kim, K. Gotow, David Stuart, Y. Takaiwa, Dong-Chul Son, A. Bodek, C. A. Fry, A. Abashian, C. Rosenfeld, E. J. Kim, H. Itoh, K. Toyoshima, A. Maki, Takashi Sasaki, Y. C. Zhu, S. L. Olsen, Yoshimasa Kurihara, R. Imlay, L. E. Piilonen, C. G. Trahern, M. H. Lee, T. Kumita, J. Li, A. T.M. Wang, S. Matsumoto, C. P. Cheng, R. C. Walker, Steve Schnetzer, Y. Sakai, A. Sill, S. S. Myung, H. W. Zheng, T. Mori, K. Ohta, Winston Ko, Y. Fujii, S. Kobayashi, Y. H. Ho, D. Blanis, K. L. Sterner, Rr Mcneil, S. K. Kim, F. Kajino, M. Frautschi, Y. T. Xu, H. Yokota, S. Wilson, Y. Sugimoto, T. Kojima, T. Yasuda, H. Kagan, Z. P. Mao, H. Harada, Richard Breedon, J. Vinson, R. L. Lander, P. Auchincloss, I. H. Park, T. Ishizuka, D. Perticone, J. S. Kang, K. Ueno, Kazumasa Miyano, K. Sparks, Sarah Catherine Eno, Susumu Terada, and R. Poling

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, Higgs boson, Production (economics)
Published
1989

26. Search for a fourth-generation charge -(1/3 quark

Author

W. Metcalf, F. Sannes, P. N. Kirk, K. P. Hu, Y. Sugimoto, Y. Yamashita, Y. K. Li, A. Murakami, C. Rosenfeld, J. S. Kang, M. C.S. Williams, S. S. Myung, J. R. Smith, T. Kojima, E. H. Low, E. H. Thorndike, H. W. Zheng, H. Asakura, J. Lim, Dong-Chul Son, Y. Fujii, A. Abashian, I. H. Park, K. Gotow, D. H. Han, M. E. Mattson, S. Wilson, G. N. Kim, Richard Breedon, Kazumasa Miyano, P. Gu, Yusuke Higashi, T. Yasuda, Hyunyong Kim, Harris Kagan, R. Tanaka, Hiroyuki Sagawa, T. Ishizuka, T. Mori, Sarah Catherine Eno, Susumu Terada, David Stuart, Y. Sakai, Alan Sill, A. T.M. Wang, Y. T. Xu, Sun Kee Kim, J. Vinson, K. Ohta, Winston Ko, Y. C. Zhu, S. L. Olsen, T. Nozaki, H. S. Budd, C. G. Trahern, R. R. McNeil, T. Kumita, Y. H. Ho, S. Kobayashi, C. A. Fry, A. Bacala, H. Itoh, R. L. Malchow, P. Auchincloss, D. Blanis, Robert Stone, Yongsun Kim, A. Bodek, R. D. Kass, Hideo Yokota, K. L. Sterner, K. Toyoshima, F. Kajino, Ron Poling, Z. P. Mao, J. Li, H. Harada, K. Ueno, R. L. Imlay, C. P. Cheng, D. Perticone, R. L. Lander, M. Frautschi, H. Miyata, Y. Ishi, E. J. Kim, Takashi Sasaki, S. Lusin, A. Maki, Kazuo Abe, Kaori Maeshima, Y. Yamagishi, Tsunehiko Omori, M. H. Lee, S. Matsumoto, R. C. Walker, Steve Schnetzer, T. L.T. Thomas, Yoshimasa Kurihara, N. M. Shaw, Y. Takaiwa, and L. E. Piilonen

Subjects
Quark, Physics, Massless particle, Nuclear physics, Particle physics, Annihilation, Branching fraction, General Physics and Astronomy, High Energy Physics::Experiment, Elementary particle, Charge (physics), Energy (signal processing), Boson
Abstract

By studying ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$ annihilations in the center-of-mass energy range between 50 and 60.8 GeV, we have established a 95%-confidence-level lower limit on the mass of a fourth-generation charge -(1/3 quark b' of 27.2 GeV. In contrast with all previous searches, this limit has been obtained through consideration of the decay processes b'\ensuremath{\rightarrow}b\ensuremath{\gamma} and b'\ensuremath{\rightarrow}bg aswell as b'\ensuremath{\rightarrow}${\mathrm{cW}}^{\mathrm{\ensuremath{-}}}$. For the cases where any one of the three decay modes dominates, we obtain higher mass limits.

Published
1989

27. Secondary T-cell Pancreatic Lymphoma Mimicking Acute Pancreatitis.

Author

X-N Shao, K-Y Hu, C-J Wu, Z. Shen, and W-X Chen

Abstract

Anaplastic large cell lymphoma (ALCL) is a highly malignant non-Hodgkin's T-cell lymphoma (NHL), and it accounts for 2-8 per cent of all lymphomas (1). Here, we report a case of secondary pancreatic anaplastic large cell lymphoma which presented as acute pancreatitis. After an extensive review of the published literature on PubMed, there was only one case of secondary T-cell pancreatic lymphoma that presented as acute pancreatitis. Our case appears to be the second one. [ABSTRACT FROM AUTHOR]

Published
2013

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