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12 results on '"Chengyong Xu"'

1. Hot pressing and microstructural characterization of SiC and TiN added TiB2 ceramics

Author

Chengyong Xu and Loke Kok Foong

Subjects
010302 applied physics, Materials science, Process Chemistry and Technology, Metallurgy, Oxide, chemistry.chemical_element, Sintering, 02 engineering and technology, 021001 nanoscience & nanotechnology, Hot pressing, Microstructure, 01 natural sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, chemistry.chemical_compound, chemistry, 0103 physical sciences, Materials Chemistry, Ceramics and Composites, 0210 nano-technology, Tin, Boron, Diffusion bonding, Solid solution
Abstract

This investigation aimed to study the individual and synergic impacts of SiC and TiN additives on the sinterability and microstructure of TiB2-based ceramics. The hot-pressing method at 2000 °C was implemented to fabricate the samples. All three samples reached their near full densities thanks to the beneficial role of the incorporated phases. In terms of the TiB2–SiC composite, the in-situ SiO2 was produced over the sintering process because of a chemical reaction between TiO2 oxide and SiC reinforcement. On the other hand, the X-ray diffraction (XRD) pattern, along with the microstructural observations, revealed the in-situ formation of hexagonal BN (hBN) in the TiB2–TiN system. Moreover, the dissolution of boron into the TiN additive led to the formation of a solid solution, and consequently, a strong diffusion bonding was achieved. Although no hBN compound was identified in the ternary system of TiB2–SiC–TiN, the results confirmed the generation of TiC and TiC0·3N0.7 ingredients during the hot pressing.

Published
2021

2. Structural transformations of carboxyl acids networks induced by concentration and oriented external electric field

Author

Shilin Xu, Xiaoling Chen, Chengyong Xu, and Wei Li

Subjects
Terephthalic acid, Morphology (linguistics), Materials science, Polarity (physics), Substrate (chemistry), 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, law.invention, chemistry.chemical_compound, chemistry, law, Chemical physics, Electric field, Trimesic acid, Scanning tunneling microscope, 0210 nano-technology, Porosity
Abstract

The effects of concentration and an oriented external electric field on the transformations of hydrogen-bonded structures of trimesic acid (TMA) and terephthalic acid (TPA) have been investigated at a liquid–solid interface by scanning tunneling microscopy (STM). The triangular periodic TMA framework can be transformed into a flower-like structure by changing the STM sample bias sign in situ. Networks of TMA and TPA are porous at a negative substrate bias, but typically change to relatively compact forms when the polarity of the applied bias is reversed. This change is reversible if the applied bias is reversed. The effects have potentials to locally control the capture and release of analytes in host-guest systems and the 2D morphology in multicomponent layers.

Published
2021

3. Densification behavior and mechanical properties of hot-pressed TiC–WC ceramics

Author

Binta Hadi Jume, Chengyong Xu, and Loke Kok Foong

Subjects
010302 applied physics, Materials science, Precipitation (chemistry), Process Chemistry and Technology, Sintering, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Grain size, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Flexural strength, visual_art, 0103 physical sciences, Vickers hardness test, Materials Chemistry, Ceramics and Composites, visual_art.visual_art_medium, Ceramic, Composite material, 0210 nano-technology, Porosity, Solid solution
Abstract

The purpose of this paper was to investigate the influence of WC as a sintering aid on the sinterability and mechanical characteristics of TiC. For this purpose, two specimens, namely TiC-5 vol% WC and monolithic TiC, were manufactured using the hot-pressing route at 2000 °C for 2 h under 50 MPa. The addition of WC uplifted the sintering behavior of TiC. The XRD and microscopical evaluations revealed the precipitation of graphitized carbon in the TiC matrix. The results also manifested the complete dissolution of WC in the matrix, forming the (Ti,W)C solid solution. The addition of WC improved the Vickers hardness and flexural strength of TiC by ~12% and ~20%, respectively. Grain size, remaining porosity, and composition of the matrix were identified as the essential factors in boosting the mechanical properties of the TiC-WC specimen compared to the monolithic TiC.

Published
2020

5. Formation of hydrogen bond-based 2D two-component supramolecular networks at liquid-solid surface

Author

Ning Liu, Wei Li, Chengyong Xu, and Xinli Leng

Subjects
Terephthalic acid, Materials science, Hydrogen bond, Heptanoic acid, Supramolecular chemistry, Nonanoic acid, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Atomic and Molecular Physics, and Optics, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, law.invention, chemistry.chemical_compound, chemistry, Highly oriented pyrolytic graphite, Chemical engineering, law, Molecule, Scanning tunneling microscope, 0210 nano-technology
Abstract

Two kinds of variable binary supramolecular structures constructed by 1,3,5-benzenetricarboxylic acid (TMA) and terephthalic acid (TPA) on a highly oriented pyrolytic graphite (HOPG) were investigated by scanning tunneling microscopy (STM). Two different solvents (heptanoic acid and nonanoic acid) were utilized to affect the self-assembling structures of TMA and TPA at the liquid/HOPG interfaces. High-resolution STM measurement revealed that the functional networks of TMA/TPA are proposed from the hydrogen-bonding under different solvents environment, and the functionalized flower network could recognize three AgNO 3 molecules. These results could be helpful for designing functionalized molecular networks by multi-component self-assembling strategy.

Published
2018

6. Observation of a novel stapler band in 75As

Author

Q. B. Chen, Jie Meng, Dongxing Jiang, Xun Chen, Q.M. Chen, Shudong Zhang, Furong Xu, W.K. Zhou, J. J. Sun, Xue-Qian Li, Z. H. Li, J. Zhong, Yan-Lin Ye, Cheng Li, Chen-Yang Niu, H. Y. Wu, Yun Zheng, Chengyong Xu, Hui Hua, Cong-Bo Li, Shi-Peng Hu, W.Y. Liang, P. J. Li, Rushan Han, Guangsheng Li, Xiao-Guang Wu, He Chuangye, and Chen-Yu Wang

Subjects
Physics, Angular momentum, Nuclear and High Energy Physics, Valence (chemistry), 010308 nuclear & particles physics, Stapler band, Tilted axis cranking covariant density functional theory, 01 natural sciences, lcsh:QC1-999, Dipole, 75As, 0103 physical sciences, Density functional theory, Neutron, Covariant transformation, Atomic physics, 010306 general physics, Spectroscopy, Beam energy, Magnetic rotation, lcsh:Physics
Abstract

The heavy ion fusion–evaporation reaction study for the high-spin spectroscopy of 75As has been performed via the reaction channel 70Zn(9Be, 1p3n)75As at a beam energy of 42 MeV. The collective structure especially a dipole band in 75As is established for the first time. The properties of this dipole band are investigated in terms of the self-consistent tilted axis cranking covariant density functional theory. Based on the theoretical description and the examination of the angular momentum components, this dipole band can be interpreted as a novel stapler band, where the valence neutrons in ( 1 g 9 / 2 ) orbital rather than the collective core are responsible for the closing of the stapler of angular momentum.

Published
2017
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8. Sign-changeable spin-filter efficiency in linear carbon atomic chain

Author

Qihang Liu, Jun-jie Shi, Jiaxin Zheng, Chengyong Xu, Zhengxiang Gao, Ruge Quhe, Hong Li, Jing Lu, Qiye Zheng, and Lu Wang

Subjects
Condensed Matter::Quantum Gases, Materials science, Condensed matter physics, Spintronics, chemistry.chemical_element, Nanotechnology, Spin filter, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Quantum transport, Chain (algebraic topology), chemistry, Graphene electrode, Physics::Atomic and Molecular Clusters, Carbon, Sign (mathematics)
Abstract

It is well known that there is spin-filter efficiency (SFE) of a linear carbon atomic chain. In this article, we examine the quantum transport calculations of a linear carbon atomic chain connected to two half-planar graphene electrodes by using the first-principle method and reveal for the first time that sign of the SFE of such carbon atomic chain is changeable with the bias. This makes the carbon atomic chains attractive to potential application of spintronics.

Published
2013

9. Search for Higgs bosons decaying to τ+τ− pairs in pp¯ collisions at s=1.96 TeV

Author

S. Greder, Iain Alexander Bertram, Michael Rijssenbeek, S. Zelitch, V. N. Evdokimov, M. Rominsky, S. J. De Jong, Kristian Harder, A. Evdokimov, D. Cutts, Greg Landsberg, K. Herner, K. Soustruznik, W. Geng, A. A. Shchukin, Frank Fiedler, E. Kajfasz, Aaron Dominguez, A. Sanchez-Hernandez, N. Khalatyan, S. Yacoob, Robert Hirosky, Y. W. Liu, Philip Baringer, George Alverson, R. K. Shivpuri, V. Simak, G. C. Blazey, R. Yamada, Ketino Kaadze, Jean-Francois Grivaz, M. Naimuddin, D. Hedin, V. A. Bezzubov, J. P. Negret, V. V. Tokmenin, R. Luna-Garcia, M. Padilla, Michael Hildreth, S. Banerjee, P. Jonsson, A. Pal, D. Menezes, Andrew Askew, Darren Price, N. Huske, P. Verdier, Thomas Hebbeker, Mary Beth Adams, S. Uzunyan, Sabine Lammers, G. Gutierrez, O. Atramentov, S. Cihangir, Wade Cameron Fisher, D. R. Claes, Gavin Davies, Markus Wobisch, W. C. Yang, Thibault Guillemin, R. Jesik, K. A. Johns, M. Hohlfeld, Wendy Taylor, Amnon Harel, G. Facini, Elizaveta Shabalina, Frederic Deliot, R. Magaña-Villalba, S. W. Cho, Maxim Perfilov, Suneel Dutt, G. Obrant, Tiefu Zhao, V. Bunichev, Christopher George Tully, Daniel Duggan, Gianluca Petrillo, H. A. Neal, R. Lopes De Sa, S. Desai, M. C. Cousinou, B. Sanghi, Petr Vokac, S. W. Youn, J. T. Linnemann, J. K. Kraus, G.S. Muanza, Gilvan Alves, Fabrice Couderc, A. Alton, A. Dubey, V. A. Kuzmin, Shabnam Jabeen, G. Sajot, Mitchell Wayne, H. E. Fisk, D. Chakraborty, L. Bellantoni, M. S. Rangel, Chengyong Xu, Meng Wang, P. L.M. Podesta-Lerma, V. M. Podstavkov, Andrew White, D. K. Cho, Patrick Slattery, M. A. Carrasco-Lizarraga, H. Schellman, J. M. Kohli, A. V. Popov, Horst Severini, W. M. Van Leeuwen, Hakjae Lee, S. M. Lietti, Y. Scheglov, P. D. Grannis, K. Yip, Kaushik De, David T. Johnston, Dmitri Tsybychev, R. L. McCarthy, Gustaaf Brooijmans, Richard B. Lipton, A. Jayasinghe, Don Lincoln, J. F. Bartlett, L. Welty-Rieger, Shih-Chang Lee, Erich Varnes, T. H. Burnett, M. Fortner, Brad Abbott, A. Chandra, K. J. Smith, Pierre Petroff, Stefan Grünendahl, B. S. Acharya, R. Nayyar, Robert Kehoe, Y. T. Tsai, Y. A. Yatsunenko, J. Warchol, Y. N. Kharzheev, Y. Ilchenko, D. Smirnov, N. K. Mondal, D. Boline, H. T. Diehl, Raymond Brock, Viatcheslav Stolin, Liang Li, T. Nunnemann, R. Van Kooten, B. Baldin, Jean-Arcady Meyer, Ulrich Heintz, M. D. Corcoran, L. Bagby, R. Beuselinck, A. S. Santos, A. Croc, Lev Dudko, Jan Stark, Pedro G Mercadante, Christophe Royon, Ph Gris, P. Skubic, L. Stutte, M. H. Kirby, M. Vesterinen, Marco Verzocchi, L. Zivkovic, B. Tuchming, John Hobbs, A.S. Dyshkant, Henry Lubatti, Carlos Avila, L. Han, P. Lebrun, Jiri Kvita, Frank Filthaut, M. Diesburg, R. Madar, A. Patwa, A. Boehnlein, H. D. Wahl, Zdenek Hubacek, K. M. Chan, V. E. Bazterra, J. Ellison, Aran Garcia-Bellido, J. Barreto, Sergey Burdin, M. Eads, A. Tanasijczuk, J. Snow, K. Peters, S. Söldner-Rembold, S. P. Denisov, T. Schliephake, Victor Daniel Elvira, Sung Keun Park, R. D. Schamberger, Suyong Choi, P. Salcido, D. A. Stoyanova, L. S. Vertogradov, F. Miconi, Oleg Brandt, J. Martínez-Ortega, D. Jamin, R. Illingworth, M. Buehler, C. L. McGivern, Mark Richard James Williams, Marcia Begalli, J. Backusmayes, Martin Grunewald, Sergio F Novaes, M. P. Sanders, Milos Lokajicek, Hang Yin, G. Golovanov, E. E. Boos, Yurii Maravin, Michael Mulhearn, Bjoern Penning, J. Orduna, C. Belanger-Champagne, J. K. Lim, B. Åsman, Elemer Nagy, G. Grenier, D. Gerbaudo, Cecile Deterre, X. B. Bu, H. Hegab, V. Parihar, Michael Begel, Eduardo De Moraes Gregores, F. Guo, Vladimir Gavrilov, M. M. Meijer, G. Otero y Garzon, A. P. Heinson, T. Yasuda, Darien Wood, S. Fuess, T. Kurca, Marc Weber, Arnulf Quadt, I. Ripp-Baudot, A. Meyer, Gordon Watts, F. Badaud, V. Sirotenko, Marc Besancon, R. Bernhard, W. E. Cooper, Sharon Hagopian, Heriberto Castilla-Valdez, Meenakshi Narain, Zhanqiang Liu, M. Cooke, B. Calpas, S. Beale, Avto Kharchilava, J. Clutter, C. P. Buszello, J. Sekaric, Michael A. Strauss, A. K.A. Maciel, M. A. Pleier, Yuehong Xie, S. Blessing, S. Chevalier-Théry, Phillip Gutierrez, T. Head, D.P. Brown, Graham Wilson, T. Hoang, Gregorio Bernardi, D. Denisov, Alexander Khanov, Terry Richard Wyatt, J. M. Hauptman, Cecilia Elena Gerber, D. Wicke, Zeno Dixon Greenwood, Jason I. Brown, Dennis Stephen Mackin, P. F. Ding, Scott Snyder, Arnaud Duperrin, P. N. Ratoff, G. Savage, Hal Evans, Thomas Ferbel, M. Prewitt, P. Renkel, Lars Sonnenschein, P. Neustroev, N. Osman, Emanuela Barberis, Yuji Enari, G. Ginther, Jong-Sung Yu, N. Prokopenko, G. Alkhazov, W. M. Lee, Y. Peters, D. V. Bandurin, T. Dorland, A. S. Ito, A. Melnitchouk, Maksym Titov, M. Merkin, Ashok Kumar, M. Jaffré, B. C.K. Casey, R. Piegaia, Joseph Haley, Jianming Qian, A. Das, P. Svoisky, S. Schlobohm, Guennadi Borissov, I. Heredia-De La Cruz, J. Joshi, H. Greenlee, D. M. Strom, P. Polozov, M. Arov, S. Kulikov, Anthony Ross, Tulika Bose, Q. Z. Li, Neeti Parashar, T. Scanlon, Guo-Ming Chen, Alexander Kupco, S. Kermiche, Suman Bala Beri, V. Hynek, K. Devaughan, Andreas Werner Jung, A. Bross, I. Katsanos, Nikos Varelas, I. Razumov, M. Zielinski, Bing Zhou, N. Parua, D. Vilanova, Randy Ruchti, V. V. Lipaev, J. Lellouch, Serban Protopopescu, Jiping Zhu, J. Hays, A. Juste, Alexander Grohsjean, J. A. Parsons, J. Osta, P. A. Kasper, M. Aoki, D. Karmanov, Anna Goussiou, Andy Haas, Lev Uvarov, Sudhir Malik, Ia Iashvili, Todd Adams, Brajesh C Choudhary, E. De La Cruz-Burelo, Konstantinos Petridis, Marvin Johnson, A. L. Lyon, D. Edmunds, Zhenyu Ye, Yuri Gershtein, E. Camacho-Pérez, A. V. Kozelov, Andrew Brandt, Kirti Ranjan, Carsten Hensel, Reinhard Schwienhorst, U. Bassler, Gregory R Snow, Regina Demina, Grigory Safronov, S. Chakrabarti, P. Rubinov, Pushpalatha C Bhat, B. Hoeneisen, Lee Sawyer, M. Demarteau, A. Jonckheere, A. Lobodenko, Daria Zieminska, G. D. Alexeev, Flera Rizatdinova, Vipin Bhatnagar, R. Partridge, Kenneth Bloom, V. L. Malyshev, Gavin Grant Hesketh, S. Uvarov, B. Quinn, C. Schwanenberger, Alice Bean, Volker Buescher, Harald Fox, L. Suter, Maiko Takahashi, I. A. Vasilyev, V. M. Abazov, and V. Shary

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, High Energy Physics::Phenomenology, Scalar (mathematics), Tevatron, 7. Clean energy, 01 natural sciences, law.invention, Standard Model, Nuclear physics, law, 0103 physical sciences, Higgs boson, High Energy Physics::Experiment, 010306 general physics, Collider, Minimal Supersymmetric Standard Model, Boson
Abstract

We present a search for the production of neutral Higgs bosons decaying into τ + τ − pairs in p p ¯ collisions at a center-of-mass energy of 1.96 TeV. The data, corresponding to an integrated luminosity of 5.4 fb−1, were collected by the D0 experiment at the Fermilab Tevatron Collider. We set upper limits at the 95% C.L. on the product of production cross section and branching ratio for a scalar resonance decaying into τ + τ − pairs, and we interpret these limits as limits on the production of Higgs bosons in the minimal supersymmetric standard model (MSSM) and as constraints in the MSSM parameter space.

Published
2012

10. Measurement of the tt¯ production cross section using dilepton events in pp¯ collisions

Author

G. Ginther, I. Ripp-Baudot, A. Meyer, L. S. Vertogradov, Jianming Qian, J. Joshi, W. M. Lee, Guennadi Borissov, I. Heredia-De La Cruz, F. Badaud, B. Sanghi, J. Orduna, S. Kulikov, Neeti Parashar, A. Sanchez-Hernandez, Z. Hubacek, I. Razumov, M. Zielinski, M. C. Cousinou, R. Bernhard, W. E. Cooper, Zeno Dixon Greenwood, J. Hays, W. M. Van Leeuwen, David T. Johnston, Sung Keun Park, V. V. Tokmenin, L. Welty-Rieger, Pedro G Mercadante, Andrew Askew, Suyong Choi, M. Merkin, Arnaud Duperrin, W. C. Yang, G. Facini, H. A. Neal, G. Golovanov, X. B. Bu, H. E. Fisk, G. Alkhazov, V. E. Bazterra, Thibault Guillemin, Gregorio Bernardi, D. Denisov, Maxim Perfilov, A. Jayasinghe, Y. A. Yatsunenko, Viatcheslav Stolin, Carlos Avila, Hal Evans, Thomas Ferbel, M. Prewitt, Lars Sonnenschein, J. T. Linnemann, D. V. Bandurin, Marc Besancon, Jong-Sung Yu, A. Jonckheere, K. Yip, A. Lobodenko, K. J. Smith, Sergio F Novaes, Hang Yin, A. Das, Aran Garcia-Bellido, P. Renkel, P. N. Ratoff, Frederic Deliot, L. Bellantoni, P. Svoisky, Christopher George Tully, L. Stutte, Andrew White, A.S. Dyshkant, E. E. Boos, R. Magaña-Villalba, S. W. Cho, G. Obrant, Y. Peters, Maksym Titov, Daria Zieminska, Gianluca Petrillo, M. P. Sanders, R. D. Schamberger, Jiri Kvita, D. Gerbaudo, A. Evdokimov, Wendy Taylor, G. S. Muanza, G. Sajot, S. Schlobohm, Cecile Deterre, Yurii Maravin, B. C.K. Casey, D. Edmunds, Heriberto Castilla-Valdez, Vladimir Gavrilov, Shabnam Jabeen, M. Arov, H. Greenlee, G. Otero y Garzon, D. M. Strom, Gordon Watts, Robert Hirosky, P. D. Grannis, T. R. Wyatt, Anthony Ross, P. A. Kasper, P. Polozov, A. Bross, V. Sirotenko, Patrick Slattery, Zhenyu Ye, V. Bunichev, Philip Baringer, J. Piper, J. Clutter, M. S. Rangel, U. Bassler, H. Hegab, V. Parihar, Yuri Gershtein, Alexander Grohsjean, Yueh-Feng Liu, Serban Protopopescu, A. L. Lyon, Phillip Gutierrez, E. De La Cruz-Burelo, Konstantinos Petridis, Dmitri Tsybychev, R. L. McCarthy, Sergey Burdin, G. Gutierrez, Raymond Brock, M. Eads, G. Savage, Gilvan Alves, Regina Demina, M. Aoki, Andy Haas, P. Salcido, D. A. Stoyanova, Lev Uvarov, E. Camacho-Pérez, C. L. McGivern, D. Chakraborty, A. V. Kozelov, P. Neustroev, Andrew Brandt, M. Buehler, R. Beuselinck, Arnulf Quadt, Chengyong Xu, Mark Richard James Williams, S. P. Denisov, T. Nunnemann, B. Baldin, G. D. Alexeev, Flera Rizatdinova, Elizaveta Shabalina, Reinhard Schwienhorst, J. Sekaric, Michael A. Strauss, Don Lincoln, Erich Varnes, Horst Severini, John Hobbs, Kirti Ranjan, Elemer Nagy, V. Simak, Carsten Hensel, Sabine Lammers, Sw. Banerjee, D. Smirnov, S. Söldner-Rembold, Daniel Duggan, Markus Wobisch, Michael Begel, S. Desai, Avto Kharchilava, J. Barreto, P. Lebrun, D. Jamin, Grigory Safronov, S. Chakrabarti, N. Prokopenko, Eduardo De Moraes Gregores, M. Jaffré, Joseph Haley, D. N. Brown, N. K. Mondal, D. Boline, H. T. Diehl, Hakjae Lee, M. Vesterinen, A. Dubey, O. Atramentov, J. Snow, Petr Vokac, Sharon Hagopian, D. Wicke, P. Rubinov, R. Madar, Junjie Zhu, T. Hoang, Y. T. Tsai, Alexander Khanov, K. Peters, A. Boehnlein, Mitchell Wayne, H. Schellman, J. M. Kohli, T. Head, Dennis Stephen Mackin, Alexander Kupco, T. Scanlon, Guo-Ming Chen, S. Kermiche, Michael Mulhearn, V. M. Podstavkov, T. Schliephake, Victor Daniel Elvira, D. K. Cho, A. K.A. Maciel, Suman Bala Beri, V. Hynek, J. K. Lim, B. Calpas, A. S. Santos, L. S. Ancu, N. Osman, F. Miconi, Oleg Brandt, M. Fortner, Stefan Grünendahl, Richard B. Lipton, J. Martínez-Ortega, Bjoern Penning, T. H. Burnett, Marco Verzocchi, I. Katsanos, A. Chandra, Pushpalatha C Bhat, Kristian Harder, B. Åsman, J. Ellison, N. Parua, D. Vilanova, Randy Ruchti, P. Verdier, Tiefu Zhao, G. Grenier, A. Patwa, K. Devaughan, S. Fuess, T. Kurca, N. Huske, S. W. Youn, A. P. Heinson, L. Zivkovic, Todd Adams, B. Tuchming, C. Belanger-Champagne, Wade Cameron Fisher, S. Chevalier-Théry, V. A. Kuzmin, Marc Weber, S. Cihangir, B. Hoeneisen, A. Croc, M. Padilla, Lee Sawyer, D. Cutts, Andreas Werner Jung, J. K. Kraus, M. A. Pleier, Ph Gris, Graham Wilson, B. S. Acharya, Ulrich Heintz, D. Khatidze, Zhifu Liu, M. H. Kirby, Fabrice Couderc, M. Cooke, P. L.M. Podesta-Lerma, Marcia Begalli, Meenakshi Narain, R. Piegaia, Frank Filthaut, Greg Landsberg, Liang Li, D. Karmanov, R. Illingworth, Emanuela Barberis, Ketino Kaadze, K. Herner, M. Diesburg, Aaron Dominguez, Brad Abbott, D. Menezes, A. S. Ito, A. Melnitchouk, Lev Dudko, Sudhir Malik, Ia Iashvili, M. Demarteau, A. Tanasijczuk, Pierre Petroff, Ashok Kumar, P. Skubic, Suneel Dutt, Brajesh C Choudhary, A. Alton, Meng Wang, R. Jesik, K. A. Johns, M. A. Carrasco-Lizarraga, K. Soustruznik, R. Van Kooten, M. D. Corcoran, Q. Z. Li, T. Dorland, S. J. De Jong, J. F. Bartlett, R. Nayyar, Robert Kehoe, Tulika Bose, L. Han, Y. N. Kharzheev, Jean-Arcady Meyer, G. C. Blazey, L. Bagby, A. Juste, Anna Goussiou, K. M. Chan, A. A. Shchukin, R. Yamada, J. A. Parsons, J. Osta, Frank Fiedler, E. Kajfasz, M. Naimuddin, Gregory R Snow, P. Jonsson, V. V. Lipaev, J. Lellouch, A. Pal, A. V. Popov, Thomas Hebbeker, Gustaaf Brooijmans, Mary Beth Adams, Shih-Chang Lee, J. Warchol, M. Hohlfeld, S. Beale, Yuji Enari, Christophe Royon, H. D. Wahl, M. M. Meijer, T. Yasuda, Vipin Bhatnagar, R. Partridge, Kenneth Bloom, V. L. Malyshev, Gavin Grant Hesketh, S. Uvarov, B. Quinn, C. Schwanenberger, Alice Bean, Volker Buescher, Nikos Varelas, Bing Zhou, J. Backusmayes, Martin Grunewald, Milos Lokajicek, F. Guo, Darien Wood, C. P. Buszello, Harald Fox, Yuehong Xie, S. Blessing, Scott Snyder, L. Suter, Maiko Takahashi, I. A. Vasilyev, J. S. Brown, V. M. Abazov, R. K. Shivpuri, D. R. Claes, Gavin Davies, R. Lopes De Sa, V. Shary, S. M. Lietti, Y. Scheglov, Kaushik De, S. Greder, Jan Stark, Henry Lubatti, Iain Alexander Bertram, Michael Rijssenbeek, S. Zelitch, Jean-Francois Grivaz, V. N. Evdokimov, M. Rominsky, Martin Johnson, V. A. Bezzubov, J. P. Negret, R. Luna-Garcia, Michael Hildreth, Darren Price, S. Uzunyan, Amnon Harel, W. Geng, N. Khalatyan, S. Yacoob, George Alverson, D. Hedin, J. M. Hauptman, and Cecilia Elena Gerber

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), 010308 nuclear & particles physics, Sigma, Jet (particle physics), 7. Clean energy, 01 natural sciences, Standard Model, Nuclear physics, Cross section (physics), 0103 physical sciences, High Energy Physics::Experiment, Production (computer science), 010306 general physics, Bar (unit), Lepton
Abstract

We present a measurement of the a production cross section sigma((u) over bar) in p (p) over bar collisions at root s = 1.96 TeV using 5.4 fb(-1) of integrated luminosity collected with the D0 detector. We consider final states with at least two jets and two leptons (ee, e mu, mu mu), and events with one jet for the e mu final state as well. The measured cross section is sigma((u) over bar) = 7.36(-0.79)(+0.90)(stat + syst) pb. This result combined with the cross section measurement in the lepton + jets final state yields sigma((u) over bar) = 7.56(-0.56)(+0.63)(stat + syst) pb, which agrees with the standard model expectation. The relative precision of 8% of this measurement is comparable to the precision of the latest theoretical calculations. (C) 2011 Elsevier B.V. All rights reserved.

Published
2011

11. Sign-changeable spin-filter efficiency and giant magnetoresistance in seamless graphene nanoribbon junctions

Author

Lili Yu, Jing Lu, Rui Qin, Chengyong Xu, Xin Yan, Guangfu Luo, Linze Li, Jiaxin Zheng, Qihang Liu, Zhengxiang Gao, and Hong Li

Subjects
Materials science, General Computer Science, Magnetoresistance, Condensed matter physics, Graphene, Ab initio, General Physics and Astronomy, Giant magnetoresistance, General Chemistry, law.invention, Condensed Matter::Materials Science, Computational Mathematics, Zigzag, Ferromagnetism, Mechanics of Materials, law, Antiferromagnetism, Condensed Matter::Strongly Correlated Electrons, General Materials Science, Physics::Chemical Physics, Order of magnitude
Abstract

Sign-changeable spin-filter efficiency is predicted in both the ferromagnetic and antiferromagnetic configurations of a zigzag graphene nanoribbon bridging two half-planar graphene electrodes from ab initio quantum transport calculations. By changing edge spin-polarization configuration, we obtain giant room-temperature magnetoresistance, which is one order of magnitude larger than the maximum experimental results.

Published
2011

12. Measurement of theWZ→ℓνℓℓcross section and limits on anomalous triple gauge couplings inpp¯collisions ats=1.96TeV

Author

J. M. Hauptman, Cecilia Elena Gerber, D. Onoprienko, B. Sanghi, G. Otero y Garzon, Vipin Bhatnagar, V. M. Abazov, V. Shary, K. Devaughan, G. Ginther, Jianming Qian, B. Tiller, J. Joshi, Markus Wobisch, A. Dubey, G. Grenier, X. B. Bu, S. Greder, Iain Alexander Bertram, D. Buchholz, R. Partridge, D. A. Stoyanova, Michael Rijssenbeek, S. Zelitch, G. Alkhazov, Sung Keun Park, A. Das, Kenneth Bloom, M. Sosebee, V. L. Malyshev, D. Karmanov, D. V. Bandurin, A. S. Santos, L. S. Ancu, C. L. McGivern, Sudhir Malik, Jean-Francois Grivaz, Ia Iashvili, Brajesh C Choudhary, V. N. Evdokimov, L. S. Vertogradov, M. Rominsky, Anna Goussiou, Y. A. Yatsunenko, M. A. Carrasco-Lizarraga, Pedro G Mercadante, Viatcheslav Stolin, M. Arov, R. Illingworth, Y. Arnoud, D. Edmunds, Michael Begel, Andrew White, S. Hossain, Graham Wilson, E. De La Cruz-Burelo, M. Jaffré, Zhenyu Ye, Maria Elena Pol, Joseph Haley, Eduardo De Moraes Gregores, Gregory R Snow, R. Bernhard, M. Ćwiok, W. E. Cooper, Yuri Gershtein, Carlos Avila, S. Beale, Alexander Grohsjean, Peter Love, Andrew Brandt, L. Zivkovic, Elizaveta Shabalina, Daniel Duggan, Z. Liu, A. S. Ito, A. Melnitchouk, Lev Uvarov, H. E. Fisk, W. M. Lee, W. Geng, S. Desai, Petr Vokac, P. A. Kasper, E. Strauss, P. N. Ratoff, E. Camacho-Pérez, Alexander Kupco, Kirti Ranjan, Carsten Hensel, E. E. Boos, Heriberto Castilla-Valdez, Harald Fox, I. Ripp-Baudot, I. Katsanos, A. Meyer, M. Buehler, T. H. Burnett, Guennadi Borissov, I. Heredia-De La Cruz, V. V. Tokmenin, Reinhard Schwienhorst, N. Khalatyan, S. Yacoob, J. Sekaric, Michael A. Strauss, Arnaud Duperrin, Y. Peters, G. Facini, H. A. Neal, J. T. Linnemann, P. M. Tuts, Jong-Sung Yu, Mark Richard James Williams, Maksym Titov, N. Parua, D. Vilanova, Randy Ruchti, Maiko Takahashi, I. A. Vasilyev, P. Lebrun, Marco Verzocchi, Theodoros Christoudias, A. Evdokimov, A. Jonckheere, Aran Garcia-Bellido, V. V. Lipaev, J. Lellouch, Sergio F Novaes, F. Badaud, J. A. Benitez, Neeti Parashar, G. Savage, A. Lobodenko, K. Yip, George Alverson, Hua-Lei Yin, R. Unalan, B. Calpas, Robert Hirosky, R. Magaña-Villalba, L. Stutte, John Hobbs, J. F. Bartlett, S. W. Cho, G. Obrant, Gianluca Petrillo, Shabnam Jabeen, Y. W. Liu, A.S. Dyshkant, R. Nayyar, Robert Kehoe, D. Hedin, A. Patwa, S. Uvarov, Mark Owen, T. Scanlon, Guo-Ming Chen, J. Barreto, S. Kermiche, Philip Baringer, Sharon Hagopian, J. Piper, M. P. Sanders, Yurii Maravin, Vladimir Gavrilov, Ulrich Heintz, B. Spurlock, I. Razumov, M. Zielinski, Suman Bala Beri, V. Hynek, Raimund Ströhmer, Daria Zieminska, V. Simak, Gordon Watts, Jiri Kvita, Sabine Lammers, Zeno Dixon Greenwood, D. Gerbaudo, A. K.A. Maciel, Frank Filthaut, J. Hays, A. Juste, V. Sirotenko, Marcia Begalli, A. F. Barfuss, B. Quinn, S. Banerjee, Todd Adams, Suyong Choi, M. Pangilinan, C. Schwanenberger, Alice Bean, V. A. Bezzubov, J. P. Negret, M. Diesburg, Oleg Brandt, J. Clutter, T. R. Wyatt, Phillip Gutierrez, G. Gutierrez, Gilvan Alves, Chengyong Xu, M. C. Cousinou, N. Huske, U. Bassler, Raymond Brock, R. Beuselinck, Mitchell Wayne, H. Schellman, J. M. Kohli, Meenakshi Narain, J. Martínez-Ortega, Bjoern Penning, G. Golovanov, Volker Buescher, T. Gadfort, C. Belanger-Champagne, W. M. Van Leeuwen, A. Tanasijczuk, R. Luna-Garcia, P. Neustroev, Regina Demina, M. Kirsch, D. Smirnov, Stefan Grünendahl, B. C.K. Casey, R. Piegaia, D. Gillberg, Sergey Burdin, M. Merkin, M. Eads, S. P. Denisov, M. Abolins, Michael Hildreth, Samuel Calvet, David T. Johnston, Dmitri Tsybychev, R. L. McCarthy, Ketino Kaadze, S. Cihangir, Fabrice Couderc, D. Khatidze, B. Tuchming, T. Moulik, Gregorio Bernardi, D. Denisov, P. Polozov, J. Snow, K. Peters, D. Menezes, Darren Price, D. Jamin, Grigory Safronov, S. Chakrabarti, M. Cooke, Hal Evans, G. D. Alexeev, Flera Rizatdinova, S. Uzunyan, Liang Li, Suneel Dutt, Thomas Ferbel, M. Prewitt, Lars Sonnenschein, A. Alton, Meng Wang, G. Hesketh, S. Söldner-Rembold, P. Rubinov, Michael Mulhearn, Marvin Johnson, Lev Dudko, N. K. Mondal, D. Boline, A. L. Lyon, H. T. Diehl, T. A. Bolton, H. Nilsen, Amnon Harel, A. Boehnlein, Marc Besancon, A. V. Kozelov, Hwi Dong Yoo, Zdenek Hubacek, Yuji Enari, J. Ellison, Y. N. Kharzheev, Sa. Jain, S. Chevalier-Théry, S. Fuess, Jean-Arcady Meyer, Pushpalatha C Bhat, L. Bagby, W. Geist, Jun Guo, Q. Z. Li, Alexey Ferapontov, T. Kurca, Marc Weber, K. M. Chan, M. Wetstein, B. Hoeneisen, Lee Sawyer, J. A. Parsons, J. Osta, Nikos Varelas, E. Carrera, M. Demarteau, T. Dorland, Bing Zhou, Stephen Wimpenny, J. Backusmayes, Martin Grunewald, Milos Lokajicek, F. Guo, Darien Wood, C. P. Buszello, Yuehong Xie, S. Blessing, Scott Snyder, R. K. Shivpuri, D. R. Claes, Gavin Davies, Philippe Calfayan, S. M. Lietti, Y. Scheglov, Kaushik De, Jan Stark, Henry Lubatti, J. Cammin, S. J. De Jong, A. A. Shchukin, Frank Fiedler, E. Kajfasz, P. Vint, A. V. Popov, Gustaaf Brooijmans, J. Warchol, Aaron Dominguez, Dorothee Schaile, M. Padilla, M. Hohlfeld, Christophe Royon, H. D. Wahl, M. M. Meijer, Frederic Deliot, Christopher George Tully, N. Osman, Patrick Slattery, T. Yasuda, Wendy Taylor, V. Bunichev, J. K. Lim, B. Åsman, A. P. Heinson, M. A. Pleier, B. S. Acharya, R. Jesik, T. Nunnemann, B. Baldin, G. Weber, K. A. Johns, D. Chakraborty, Don Lincoln, Erich Varnes, M. Vesterinen, P. Haefner, Tiefu Zhao, R. Madar, Andre Sopczak, S. W. Youn, J. K. Kraus, T. Schliephake, Victor Daniel Elvira, P. Renkel, P. L.M. Podesta-Lerma, W. C. Yang, S. Schlobohm, Maxim Perfilov, H. Greenlee, P. Verdier, D. M. Strom, A. Bross, Brad Abbott, Wade Cameron Fisher, Pierre Petroff, Serban Protopopescu, Emanuela Barberis, L. Bellantoni, M. Aoki, Andy Haas, V. A. Kuzmin, P. D. Grannis, G. C. Blazey, Ashok Kumar, V. Parihar, A. Sanchez-Hernandez, R. Yamada, M. Naimuddin, P. Jonsson, Thomas Hebbeker, Andrew Askew, Mary Beth Adams, Avto Kharchilava, T. Hoang, D. N. Brown, Tulika Bose, Alexander Khanov, Kristian Harder, D. Cutts, J. Orduna, R. Van Kooten, M. D. Corcoran, Greg Landsberg, K. Herner, P. Skubic, R. D. Schamberger, L. Han, K. Soustruznik, G. S. Muanza, G. Sajot, Y. Hu, M. S. Rangel, P. Rich, Arnulf Quadt, Elemer Nagy, Sarah Catherine Eno, Horst Severini, Hakjae Lee, Junjie Zhu, D. Wicke, Richard B. Lipton, Dennis Stephen Mackin, O. Atramentov, V. M. Podstavkov, D. K. Cho, M. Fortner, A. Chandra, A. Croc, Ph Gris, M. H. Kirby, and P. Svoisky

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), 010308 nuclear & particles physics, Tevatron, Elementary particle, Lambda, 01 natural sciences, Standard Model, Nuclear physics, W and Z bosons, 0103 physical sciences, Grand Unified Theory, High Energy Physics::Experiment, 010306 general physics, Boson
Abstract

We present a new measurement of the WZ -> lvll (l = e, mu) cross section and limits on anomalous triple gauge couplings. Using 4.1 fb(-1) of integrated luminosity of p (p) over bar collisions at root s = 1.96 TeV, we observe 34 WZ candidate events with an estimated background of 6.0 +/- 0.4 events. We measure the WZ production cross section to be 3.89(-0.90)(+1.07) pb, in good agreement with the standard model prediction. We find no evidence for anomalous WWZ couplings and set 95% C.L. limits on the coupling parameters, -0.077 < lambda(z) < 0.093 and -0.029 < Delta kappa(z) < 0.080 in the HISZ parameterization for a Lambda = 2 TeV form factor scale. These are the best limits to date obtained from the direct measurement of the WWZ vertex.

Published
2011

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