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IEEE International Conference on Intelligent engineering Systems (INES)

作者： Y. Kunii B. Solvang G. Sziebig P. Korondi Department of Electrical and Electronic Engineering Chuo University Bunkyo Tokyo Japan Department of Industrial Engineering Narvik University College Narvik Norway Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Friction is a very old and universal issue in all mechanical systems. Since friction is non-linear, it is an ever challenging problem. Several empirical nonlinear friction models have been proposed in the technical literature. This paper does not propose any new model but it presents a new, tensor product (TP) based representation of the existing friction models which is suitable for control design. The TP model transformation is a relatively new method for transforming certain nonlinear models into polytopic model form. The main advantage of the TP model transformation is that the most of the linear state feedback design methods including Linear Matrix Inequality (LMI) can immediately applied to the resulting polytopic models to yield controllers with guaranteed performance.

关键词： Tensile stress Friction Control design Mechanical systems Linear matrix inequalities Industrial electronics Educational institutions Industrial engineering automation Informatics

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System-Size Independence of Directed Flow Measured at the BNL Relativistic Heavy-Ion Collider

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Physical Review Letters 2008年第25期101卷 252301-252301页

作者： B. I. Abelev M. M. Aggarwal Z. Ahammed B. D. Anderson D. Arkhipkin G. S. Averichev Y. Bai J. Balewski O. Barannikova L. S. Barnby J. Baudot S. Baumgart D. R. Beavis R. Bellwied F. Benedosso R. R. Betts S. Bhardwaj A. Bhasin A. K. Bhati H. Bichsel J. Bielcik J. Bielcikova B. Biritz L. C. Bland M. Bombara B. E. Bonner M. Botje J. Bouchet E. Braidot A. V. Brandin S. Bueltmann T. P. Burton M. Bystersky X. Z. Cai H. Caines M. Calderón de la Barca Sánchez J. Callner O. Catu D. Cebra R. Cendejas M. C. Cervantes Z. Chajecki P. Chaloupka S. Chattopadhyay H. F. Chen J. H. Chen J. Y. Chen J. Cheng M. Cherney A. Chikanian K. E. Choi W. Christie S. U. Chung R. F. Clarke M. J. M. Codrington J. P. Coffin T. M. Cormier M. R. Cosentino J. G. Cramer H. J. Crawford D. Das S. Dash M. Daugherity M. M. de Moura T. G. Dedovich M. DePhillips A. A. Derevschikov R. Derradi de Souza L. Didenko T. Dietel P. Djawotho S. M. Dogra X. Dong J. L. Drachenberg J. E. Draper F. Du J. C. Dunlop M. R. Dutta Mazumdar W. R. Edwards L. G. Efimov E. Elhalhuli M. Elnimr V. Emelianov J. Engelage G. Eppley B. Erazmus M. Estienne L. Eun P. Fachini R. Fatemi J. Fedorisin A. Feng P. Filip E. Finch V. Fine Y. Fisyak C. A. Gagliardi L. Gaillard D. R. Gangadharan M. S. Ganti E. Garcia-Solis V. Ghazikhanian P. Ghosh Y. N. Gorbunov A. Gordon O. Grebenyuk D. Grosnick B. Grube S. M. Guertin K. S. F. F. Guimaraes A. Gupta N. Gupta W. Guryn B. Haag T. J. Hallman A. Hamed J. W. Harris W. He M. Heinz S. Heppelmann B. Hippolyte A. Hirsch A. M. Hoffman G. W. Hoffmann D. J. Hofman R. S. Hollis H. Z. Huang E. W. Hughes T. J. Humanic G. Igo A. Iordanova P. Jacobs W. W. Jacobs P. Jakl F. Jin P. G. Jones E. G. Judd S. Kabana K. Kajimoto K. Kang J. Kapitan M. Kaplan D. Keane A. Kechechyan D. Kettler V. Yu. Khodyrev J. Kiryluk A. Kisiel S. R. Klein A. G. Knospe A. Kocoloski D. D. Koetke T. Kollegger M. Kopytine L. Kotchenda V. Kouchpil P. Kravtsov V. I. Kravtsov K. Krueger C. Kuhn A. Kumar L. Kumar P. Kurnadi M. A. C. Lamont J. M. Landgraf S. Lange S. LaPointe F. Laue J. Lauret A. University of Illinois at Chicago Chicago Illinois 60607 USA Panjab University Chandigarh 160014 India Variable Energy Cyclotron Centre Kolkata 700064 India Kent State University Kent Ohio 44242 USA Particle Physics Laboratory (JINR) Dubna Russia Laboratory for High Energy (JINR) Dubna Russia NIKHEF and Utrecht University Amsterdam The Netherlands Massachusetts Institute of Technology Cambridge Massachusetts 02139-4307 USA University of Birmingham Birmingham United Kingdom Institut de Recherches Subatomiques Strasbourg France Yale University New Haven Connecticut 06520 USA Brookhaven National Laboratory Upton New York 11973 USA Wayne State University Detroit Michigan 48201 USA University of Rajasthan Jaipur 302004 India University of Jammu Jammu 180001 India University of Washington Seattle Washington 98195 USA Nuclear Physics Institute AS CR 250 68 Řež/Prague Czech Republic University of California Los Angeles California 90095 USA Rice University Houston Texas 77251 USA Moscow Engineering Physics Institute Moscow Russia Shanghai Institute of Applied Physics Shanghai 201800 China University of California Davis California 95616 USA Texas A&M University College Station Texas 77843 USA Ohio State University Columbus Ohio 43210 USA University of Science and Technology of China Hefei 230026 China Institute of Particle Physics CCNU (HZNU) Wuhan 430079 China Tsinghua University Beijing 100084 China Creighton University Omaha Nebraska 68178 USA Pusan National University Pusan Republic of Korea Universidade de Sao Paulo Sao Paulo Brazil University of California Berkeley California 94720 USA Institute of Physics Bhubaneswar 751005 India University of Texas Austin Texas 78712 USA Institute of High Energy Physics Protvino Russia Universidade Estadual de Campinas Sao Paulo Brazil University of Frankfurt Frankfurt Germany Indiana University Bloomington Indiana 47408 USA Lawrence Berkeley National Laboratory Berkeley California 94720 US

We measure directed flow (v1) for charged particles in Au+Au and Cu+Cu collisions at sNN=200 and 62.4 GeV, as a function of pseudorapidity (η), transverse momentum (pt), and collision centrality, based on data from the STAR experiment. We find that the directed flow depends on the incident energy but, contrary to all available model implementations, not on the size of the colliding system at a given centrality. We extend the validity of the limiting fragmentation concept to v1 in different collision systems, and investigate possible explanations for the observed sign change in v1(pt).

关键词： Germanium alloys

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Forward Neutral-Pion Transverse Single-Spin Asymmetries in p+p Collisions at s=200 GeV

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Physical Review Letters 2008年第22期101卷 222001-222001页

作者： B. I. Abelev M. M. Aggarwal Z. Ahammed B. D. Anderson D. Arkhipkin G. S. Averichev Y. Bai J. Balewski O. Barannikova L. S. Barnby J. Baudot S. Baumgart D. R. Beavis R. Bellwied F. Benedosso R. R. Betts S. Bhardwaj A. Bhasin A. K. Bhati H. Bichsel J. Bielcik J. Bielcikova L. C. Bland S-L. Blyth M. Bombara B. E. Bonner M. Botje J. Bouchet E. Braidot A. V. Brandin S. Bueltmann T. P. Burton M. Bystersky X. Z. Cai H. Caines M. Calderón de la Barca Sánchez J. Callner O. Catu D. Cebra M. C. Cervantes Z. Chajecki P. Chaloupka S. Chattopadhyay H. F. Chen J. H. Chen J. Y. Chen J. Cheng M. Cherney A. Chikanian K. E. Choi W. Christie S. U. Chung R. F. Clarke M. J. M. Codrington J. P. Coffin T. M. Cormier M. R. Cosentino J. G. Cramer H. J. Crawford D. Das S. Dash M. Daugherity M. M. de Moura T. G. Dedovich M. DePhillips A. A. Derevschikov R. Derradi de Souza L. Didenko T. Dietel P. Djawotho S. M. Dogra X. Dong J. L. Drachenberg J. E. Draper F. Du J. C. Dunlop M. R. Dutta Mazumdar W. R. Edwards L. G. Efimov E. Elhalhuli V. Emelianov J. Engelage G. Eppley B. Erazmus M. Estienne L. Eun P. Fachini R. Fatemi J. Fedorisin A. Feng P. Filip E. Finch V. Fine Y. Fisyak J. Fu C. A. Gagliardi L. Gaillard M. S. Ganti E. Garcia-Solis V. Ghazikhanian P. Ghosh Y. N. Gorbunov A. Gordon H. Gos O. Grebenyuk D. Grosnick B. Grube S. M. Guertin K. S. F. F. Guimaraes A. Gupta N. Gupta W. Guryn B. Haag T. J. Hallman A. Hamed J. W. Harris W. He M. Heinz T. W. Henry S. Heppelmann B. Hippolyte A. Hirsch E. Hjort A. M. Hoffman G. W. Hoffmann D. J. Hofman R. S. Hollis M. J. Horner H. Z. Huang E. W. Hughes T. J. Humanic G. Igo A. Iordanova P. Jacobs W. W. Jacobs P. Jakl F. Jin P. G. Jones E. G. Judd S. Kabana K. Kajimoto K. Kang J. Kapitan M. Kaplan D. Keane A. Kechechyan D. Kettler V. Yu. Khodyrev J. Kiryluk A. Kisiel S. R. Klein A. G. Knospe A. Kocoloski D. D. Koetke T. Kollegger M. Kopytine L. Kotchenda V. Kouchpil K. L. Kowalik P. Kravtsov V. I. Kravtsov K. Krueger C. Kuhn A. Kumar P. Kurnadi M. A. C. Lamont J. M. Landgraf J. Langdon S. Lange S. LaPoi University of Illinois at Chicago Chicago Illinois 60607 USA Panjab University Chandigarh 160014 India Variable Energy Cyclotron Centre Kolkata 700064 India Kent State University Kent Ohio 44242 USA Particle Physics Laboratory (JINR) Dubna Russia Laboratory for High Energy (JINR) Dubna Russia NIKHEF and Utrecht University Amsterdam The Netherlands Indiana University Bloomington Indiana 47408 USA University of Birmingham Birmingham United Kingdom Institut de Recherches Subatomiques Strasbourg France Yale University New Haven Connecticut 06520 USA Brookhaven National Laboratory Upton New York 11973 USA Wayne State University Detroit Michigan 48201 USA University of Rajasthan Jaipur 302004 India University of Jammu Jammu 180001 India University of Washington Seattle Washington 98195 USA Nuclear Physics Institute AS CR 250 68 Řež/Prague Czech Republic Lawrence Berkeley National Laboratory Berkeley California 94720 USA Rice University Houston Texas 77251 USA SUBATECH Nantes France Moscow Engineering Physics Institute Moscow Russia Shanghai Institute of Applied Physics Shanghai 201800 China University of California Davis California 95616 USA Texas A&M University College Station Texas 77843 USA Ohio State University Columbus Ohio 43210 USA University of Science and Technology of China Hefei 230026 China Institute of Particle Physics CCNU (HZNU) Wuhan 430079 China Tsinghua University Beijing 100084 China Creighton University Omaha Nebraska 68178 USA Pusan National University Pusan Republic of Korea Universidade de Sao Paulo Sao Paulo Brazil University of California Berkeley California 94720 USA Institute of Physics Bhubaneswar 751005 India University of Texas Austin Texas 78712 USA Institute of High Energy Physics Protvino Russia Universidade Estadual de Campinas Sao Paulo Brazil University of Frankfurt Frankfurt Germany Pennsylvania State University University Park Pennsylvania 16802 USA University of Kentucky Lexington Kentuck

We report precision measurements of the Feynman x (xF) dependence, and first measurements of the transverse momentum (pT) dependence, of transverse single-spin asymmetries for the production of π0 mesons from polarized proton collisions at s=200 GeV. The xF dependence of the results is in fair agreement with perturbative QCD model calculations that identify orbital motion of quarks and gluons within the proton as the origin of the spin effects. Results for the pT dependence at fixed xF are not consistent with these same perturbative QCD-based calculations.

关键词： Germanium alloys

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P0-2-14 Production of biodiesel from waste oil by supercritical fluid technology

P0-2-14 Production of biodiesel from waste oil by supercriti...

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2007生物炼制国际会议(The International Conference on Biorefinery)

作者： Sheng-lan Tang Yu-jie Zhou Jian-an Zhang Ke-ke Cheng Hong-Juan Liu De-Hua Liu Chun Li Green Chemistry and Technology Division Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084China Food College Shihezi University Shihezi 832000 China Green Chemistry and Technology Division Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084China Institute of Applied chemistry Department of Chemical Engineering Tsinghua University Beijing 100084 China School of Life Science and Technology Beijing Institute the of Technology Beijing 100081 China

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Using genetic algorithm for magnitude model parameter identification

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Journal of Information and Computational Science 2007年第4期4卷 1105-1112页

作者： Tan, Bin Zhou, Haiyun Zhang, Jihua Tan, Bitao Tang, Litie Guo, Shibo Institute of Applied Mathematics and Mechanics Ordnance Engineering College Shijiazhuang 050003 China Northwest Institute of Nuclear Technology Xi'an 710024 China Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun 130033 China P.O.Box 21-189 Urumchi 841700 China

The parameter identification is actually a complicated nonlinear optimization problem. The traditional optimization algorithms are apt to be trapped into local minimum and the computation efficiencies are quite low. However genetic algorithm is a directed random search method, which has a good probability converge to global optimum. A genetic algorithm called Random Sampling and Space Reduction Genetic Algorithm RSSRGA was designed to evaluate magnitude model parameter. The method is based on Simple Genetic Algorithm (SGM). A set of magnitude measurement data was used to test the algorithms. Three GA models, SGA, RSGA (Rand Sample Genetic Algorithm) and RSSRGA were evaluated, and all models can find the satisfied solutions, but random sampling space reduction genetic algorithm has the fastest convergence rate.

关键词： Optimization

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Virtual Power Electronics: Novel Software Tools for Design, Modeling and Education

Virtual Power Electronics: Novel Software Tools for Design, ...

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Power Conversion Conference

作者： J. Hamar I. Nagy H. Funato S. Ogasawara O. Dranga Y. Nishida Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Ogasawara & Funato Laboratory Department of Electrical and Electronic Engineering Utsunomiya University Tochigi Japan School of Engineering James Cook University Townsville QLD Australia Energy Electronics Laboratory Department of Electrical & Electronic Engineering College of Engineering Nihon University Tokusada Kouriyama Japan

ISBN: (纸本)1424408431;9781424408436

The current paper is dedicated to present browser-based multimedia-rich software tools and e-learning curriculum to support the design and modeling process of power electronics circuits and to explain sometimes rather sophisticated phenomena. Two projects will be discussed. The so-called Inetele project is financed by the Leonardo da Vinci program of the European Union(EU). It is a collaborative project between numerous EU universities and institutes to develop state-of-the art curriculum in electrical engineering. Another cooperative project with participation of Japanese, European and Australian institutes focuses especially on developing e-learning curriculum, interactive design and modeling tools, furthermore on development of a virtual laboratory. Snapshots from these two projects will be presented.

关键词： Power electronics Software tools Software design Electronic learning Educational programs Process design Circuits Collaboration Educational institutions Art

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Enhanced strange baryon production in Au+Au collisions compared to p+p at sNN=200 GeV

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Physical Review C 2008年第4期77卷 044908-044908页

作者： B. I. Abelev M. M. Aggarwal Z. Ahammed B. D. Anderson D. Arkhipkin G. S. Averichev Y. Bai J. Balewski O. Barannikova L. S. Barnby J. Baudot S. Baumgart D. R. Beavis R. Bellwied F. Benedosso R. R. Betts S. Bhardwaj A. Bhasin A. K. Bhati H. Bichsel J. Bielcik J. Bielcikova L. C. Bland S.-L. Blyth M. Bombara B. E. Bonner M. Botje J. Bouchet E. Braidot A. V. Brandin S. Bueltmann T. P. Burton M. Bystersky X. Z. Cai H. Caines M. Calderón de la Barca Sánchez J. Callner O. Catu D. Cebra M. C. Cervantes Z. Chajecki P. Chaloupka S. Chattopadhyay H. F. Chen J. H. Chen J. Y. Chen J. Cheng M. Cherney A. Chikanian K. E. Choi W. Christie S. U. Chung R. F. Clarke M. J. M. Codrington J. P. Coffin T. M. Cormier M. R. Cosentino J. G. Cramer H. J. Crawford D. Das S. Dash M. Daugherity M. M. de Moura T. G. Dedovich M. DePhillips A. A. Derevschikov R. Derradi de Souza L. Didenko T. Dietel P. Djawotho S. M. Dogra X. Dong J. L. Drachenberg J. E. Draper F. Du J. C. Dunlop M. R. Dutta Mazumdar W. R. Edwards L. G. Efimov E. Elhalhuli V. Emelianov J. Engelage G. Eppley B. Erazmus M. Estienne L. Eun P. Fachini R. Fatemi J. Fedorisin A. Feng P. Filip E. Finch V. Fine Y. Fisyak J. Fu C. A. Gagliardi L. Gaillard M. S. Ganti E. Garcia-Solis V. Ghazikhanian P. Ghosh Y. G. Gorbunov A. Gordon O. Grebenyuk D. Grosnick B. Grube S. M. Guertin K. S. F. F. Guimaraes A. Gupta N. Gupta W. Guryn B. Haag T. J. Hallman A. Hamed J. W. Harris W. He M. Heinz T. W. Henry S. Heppelmann B. Hippolyte A. Hirsch E. Hjort A. M. Hoffman G. W. Hoffmann D. J. Hofman R. S. Hollis M. J. Horner H. Z. Huang E. W. Hughes T. J. Humanic G. Igo A. Iordanova P. Jacobs W. W. Jacobs P. Jakl F. Jin P. G. Jones E. G. Judd S. Kabana K. Kajimoto K. Kang J. Kapitan M. Kaplan D. Keane A. Kechechyan D. Kettler V. Yu. Khodyrev J. Kiryluk A. Kisiel S. R. Klein A. G. Knospe A. Kocoloski D. D. Koetke T. Kollegger M. Kopytine L. Kotchenda V. Kouchpil K. L. Kowalik P. Kravtsov V. I. Kravtsov K. Krueger C. Kuhn A. Kumar L. Kumar P. Kurnadi M. A. C. Lamont J. M. Landgraf S. Lange S. LaPointe F. L University of Illinois at Chicago Chicago Illinois 60607 USA Panjab University Chandigarh 160014 India Variable Energy Cyclotron Centre Kolkata 700064 India Kent State University Kent Ohio 44242 USA Particle Physics Laboratory (JINR) Dubna Russia Laboratory for High Energy (JINR) Dubna Russia NIKHEF and Utrecht University Amsterdam The Netherlands Indiana University Bloomington Indiana 47408 USA University of Birmingham Birmingham United Kingdom Institut de Recherches Subatomiques Strasbourg France Yale University New Haven Connecticut 06520 USA Brookhaven National Laboratory Upton New York 11973 USA Wayne State University Detroit Michigan 48201 USA University of Rajasthan Jaipur 302004 India University of Jammu Jammu 180001 India University of Washington Seattle Washington 98195 USA Nuclear Physics Institute AS CR CZ-25068 Rez/Prague Czech Republic Lawrence Berkeley National Laboratory Berkeley California 94720 USA Rice University Houston Texas 77251 USA SUBATECH Nantes France Moscow Engineering Physics Institute Moscow Russia Shanghai Institute of Applied Physics Shanghai 201800 People's Republic of China University of California Davis California 95616 USA Texas A&M University College Station Texas 77843 USA Ohio State University Columbus Ohio 43210 USA University of Science & Technology of China Hefei 230026 People's Republic of China Institute of Particle Physics CCNU (HZNU) Wuhan 430079 People's Republic of China Tsinghua University Beijing 100084 People's Republic of China Creighton University Omaha Nebraska 68178 USA Pusan National University Pusan Republic of Korea Universidade de Sao Paulo Sao Paulo Brazil University of California Berkeley California 94720 USA Institute of Physics Bhubaneswar 751005 India University of Texas Austin Texas 78712 USA Institute of High Energy Physics Protvino Russia Universidade Estadual de Campinas Sao Paulo Brazil University of Frankfurt Frankfurt Germany Pennsylvania State University

We report on the observed differences in production rates of strange and multistrange baryons in Au+Au collisions at sNN=200 GeV compared to p+p interactions at the same energy. The strange baryon yields in Au+Au collisions, when scaled down by the number of participating nucleons, are enhanced relative to those measured in p+p reactions. The enhancement observed increases with the strangeness content of the baryon, and it increases for all strange baryons with collision centrality. The enhancement is qualitatively similar to that observed at the lower collision energy sNN=17.3 GeV. The previous observations are for the bulk production, while at intermediate pT,1

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Centrality dependence of charged hadron and strange hadron elliptic flow from sNN=200 GeV Au+Au collisions

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Physical Review C 2008年第5期77卷 054901-054901页

作者： B. I. Abelev M. M. Aggarwal Z. Ahammed B. D. Anderson D. Arkhipkin G. S. Averichev Y. Bai J. Balewski O. Barannikova L. S. Barnby J. Baudot S. Baumgart D. R. Beavis R. Bellwied F. Benedosso R. R. Betts S. Bhardwaj A. Bhasin A. K. Bhati H. Bichsel J. Bielcik J. Bielcikova L. C. Bland M. Bombara B. E. Bonner M. Botje E. Braidot A. V. Brandin S. Bueltmann T. P. Burton M. Bystersky X. Z. Cai H. Caines M. Calderón de la Barca Sánchez J. Callner O. Catu D. Cebra M. C. Cervantes Z. Chajecki P. Chaloupka S. Chattopadhyay H. F. Chen J. H. Chen J. Y. Chen J. Cheng M. Cherney A. Chikanian K. E. Choi W. Christie S. U. Chung R. F. Clarke M. J. M. Codrington J. P. Coffin T. M. Cormier M. R. Cosentino J. G. Cramer H. J. Crawford D. Das S. Dash M. Daugherity M. M. de Moura T. G. Dedovich M. DePhillips A. A. Derevschikov R. Derradi de Souza L. Didenko T. Dietel P. Djawotho S. M. Dogra X. Dong J. L. Drachenberg J. E. Draper F. Du J. C. Dunlop M. R. Dutta Mazumdar W. R. Edwards L. G. Efimov E. Elhalhuli V. Emelianov J. Engelage G. Eppley B. Erazmus M. Estienne L. Eun P. Fachini R. Fatemi J. Fedorisin A. Feng P. Filip E. Finch V. Fine Y. Fisyak C. A. Gagliardi L. Gaillard M. S. Ganti E. Garcia-Solis V. Ghazikhanian P. Ghosh Y. N. Gorbunov A. Gordon O. Grebenyuk D. Grosnick B. Grube S. M. Guertin A. Gupta N. Gupta W. Guryn B. Haag T. J. Hallman A. Hamed J. W. Harris W. He M. Heinz S. Heppelmann B. Hippolyte A. Hirsch A. M. Hoffman G. W. Hoffmann D. J. Hofman R. S. Hollis H. Z. Huang E. W. Hughes T. J. Humanic G. Igo A. Iordanova P. Jacobs W. W. Jacobs P. Jakl F. Jin P. G. Jones E. G. Judd S. Kabana K. Kajimoto K. Kang J. Kapitan M. Kaplan D. Keane A. Kechechyan D. Kettler V. Yu. Khodyrev J. Kiryluk A. Kisiel S. R. Klein A. G. Knospe A. Kocoloski D. D. Koetke T. Kollegger M. Kopytine L. Kotchenda V. Kouchpil P. Kravtsov V. I. Kravtsov K. Krueger C. Kuhn A. Kumar L. Kumar P. Kurnadi M. A. C. Lamont J. M. Landgraf S. Lange S. LaPointe F. Laue J. Lauret A. Lebedev R. Lednicky C.-H. Lee M. J. LeVine C. Li Y. Li G. Lin X. Lin S. J. Lindenb University of Illinois at Chicago Chicago Illinois 60607 USA Panjab University Chandigarh 160014 India Variable Energy Cyclotron Centre Kolkata 700064 India Kent State University Kent Ohio 44242 USA Particle Physics Laboratory (JINR) Dubna Russia Laboratory for High Energy (JINR) Dubna Russia NIKHEF and Utrecht University Amsterdam The Netherlands Massachusetts Institute of Technology Cambridge MA 02139-4307 USA University of Birmingham Birmingham United Kingdom Institut de Recherches Subatomiques Strasbourg France Yale University New Haven Connecticut 06520 USA Brookhaven National Laboratory Upton New York 11973 USA Wayne State University Detroit Michigan 48201 USA University of Rajasthan Jaipur 302004 India University of Jammu Jammu 180001 India University of Washington Seattle Washington 98195 USA Nuclear Physics Institute AS CR 250 68 Řež/Prague Czech Republic Rice University Houston Texas 77251 USA Moscow Engineering Physics Institute Moscow Russia Shanghai Institute of Applied Physics Shanghai 201800 People's Republic of China University of California Davis California 95616 USA Texas A&M University College Station Texas 77843 USA Ohio State University Columbus Ohio 43210 USA University of Science & Technology of China Hefei 230026 People's Republic of China Institute of Particle Physics CCNU (HZNU) Wuhan 430079 People's Republic of China Tsinghua University Beijing 100084 People's Republic of China Creighton University Omaha Nebraska 68178 USA Pusan National University Pusan Republic of Korea Universidade de Sao Paulo Sao Paulo Brazil University of California Berkeley California 94720 USA Institute of Physics Bhubaneswar 751005 India University of Texas Austin Texas 78712 USA Institute of High Energy Physics Protvino Russia Universidade Estadual de Campinas Sao Paulo Brazil University of Frankfurt Frankfurt Germany Indiana University Bloomington Indiana 47408 USA Lawrence Berkeley National Laboratory Berkeley Californi

We present STAR results on the elliptic flow v2 of charged hadrons, strange and multistrange particles from sNN=200 GeV Au+Au collisions at the BNL Relativistic Heavy Ion Collider (RHIC). The detailed study of the centrality dependence of v2 over a broad transverse momentum range is presented. Comparisons of different analysis methods are made in order to estimate systematic uncertainties. To discuss the nonflow effect, we have performed the first analysis of v2 with the Lee-Yang zero method for KS0 and Λ. In the relatively low pT region, pT⩽2 GeV/c, a scaling with mT−m is observed for identified hadrons in each centrality bin studied. However, we do not observe v2(pT) scaled by the participant eccentricity to be independent of centrality. At higher pT,2⩽pT⩽6 GeV/c,v2 scales with quark number for all hadrons studied. For the multistrange hadron Ω, which does not suffer appreciable hadronic interactions, the values of v2 are consistent with both mT−m scaling at low pT and number-of-quark scaling at intermediate pT. As a function of collision centrality, an increase of pT-integrated v2 scaled by the participant eccentricity has been observed, indicating a stronger collective flow in more central Au+Au collisions.

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Spin alignment measurements of the K*0(892) and ϕ(1020) vector mesons in heavy ion collisions at sNN=200 GeV

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Physical Review C 2008年第6期77卷 061902(R)-061902(R)页

作者： B. I. Abelev M. M. Aggarwal Z. Ahammed B. D. Anderson D. Arkhipkin G. S. Averichev Y. Bai J. Balewski O. Barannikova L. S. Barnby J. Baudot S. Baumgart D. R. Beavis R. Bellwied F. Benedosso R. R. Betts S. Bhardwaj A. Bhasin A. K. Bhati H. Bichsel J. Bielcik J. Bielcikova B. Biritz L. C. Bland M. Bombara B. E. Bonner M. Botje J. Bouchet E. Braidot A. V. Brandin S. Bueltmann T. P. Burton M. Bystersky X. Z. Cai H. Caines M. Calderón de la Barca Sánchez J. Callner O. Catu D. Cebra R. Cendejas M. C. Cervantes Z. Chajecki P. Chaloupka S. Chattopadhyay H. F. Chen J. H. Chen J. Y. Chen J. Cheng M. Cherney A. Chikanian K. E. Choi W. Christie S. U. Chung R. F. Clarke M. J. M. Codrington J. P. Coffin T. M. Cormier M. R. Cosentino J. G. Cramer H. J. Crawford D. Das S. Dash M. Daugherity M. M. de Moura T. G. Dedovich M. DePhillips A. A. Derevschikov R. Derradi de Souza L. Didenko T. Dietel P. Djawotho S. M. Dogra X. Dong J. L. Drachenberg J. E. Draper F. Du J. C. Dunlop M. R. Dutta Mazumdar W. R. Edwards L. G. Efimov E. Elhalhuli M. Elnimr V. Emelianov J. Engelage G. Eppley B. Erazmus M. Estienne L. Eun P. Fachini R. Fatemi J. Fedorisin A. Feng P. Filip E. Finch V. Fine Y. Fisyak C. A. Gagliardi L. Gaillard D. R. Gangadharan M. S. Ganti E. Garcia-Solis V. Ghazikhanian P. Ghosh Y. N. Gorbunov A. Gordon O. Grebenyuk D. Grosnick B. Grube S. M. Guertin K. S. F. F. Guimaraes A. Gupta N. Gupta W. Guryn B. Haag T. J. Hallman A. Hamed J. W. Harris W. He M. Heinz S. Heppelmann B. Hippolyte A. Hirsch A. M. Hoffman G. W. Hoffmann D. J. Hofman R. S. Hollis H. Z. Huang E. W. Hughes T. J. Humanic G. Igo A. Iordanova P. Jacobs W. W. Jacobs P. Jakl F. Jin P. G. Jones E. G. Judd S. Kabana K. Kajimoto K. Kang J. Kapitan M. Kaplan D. Keane A. Kechechyan D. Kettler V. Yu. Khodyrev J. Kiryluk A. Kisiel S. R. Klein A. G. Knospe A. Kocoloski D. D. Koetke T. Kollegger M. Kopytine L. Kotchenda V. Kouchpil P. Kravtsov V. I. Kravtsov K. Krueger C. Kuhn A. Kumar L. Kumar P. Kurnadi M. A. C. Lamont J. M. Landgraf S. Lange S. LaPointe F. Laue J. Lauret A. University of Illinois at Chicago Chicago Illinois 60607 USA Panjab University Chandigarh 160014 India Variable Energy Cyclotron Centre Kolkata 700064 India Kent State University Kent Ohio 44242 USA Particle Physics Laboratory (JINR) Dubna Russia Laboratory for High Energy (JINR) Dubna Russia NIKHEF and Utrecht University Amsterdam The Netherlands Massachusetts Institute of Technology Cambridge Massachusetts 02139-4307 USA University of Birmingham Birmingham United Kingdom Institut de Recherches Subatomiques Strasbourg France Yale University New Haven Connecticut 06520 USA Brookhaven National Laboratory Upton New York 11973 USA Wayne State University Detroit Michigan 48201 USA University of Rajasthan Jaipur 302004 India University of Jammu Jammu 180001 India University of Washington Seattle Washington 98195 USA Nuclear Physics Institute AS CR 250 68 Řež / Prague Czech Republic University of California Los Angeles California 90095 USA Rice University Houston Texas 77251 USA Moscow Engineering Physics Institute Moscow Russia Shanghai Institute of Applied Physics Shanghai 201800 People's Republic of China University of California Davis California 95616 USA Texas A&M University College Station Texas 77843 USA Ohio State University Columbus Ohio 43210 USA University of Science & Technology of China Hefei 230026 People's Republic of China Institute of Particle Physics CCNU (HZNU) Wuhan 430079 People's Republic of China Tsinghua University Beijing 100084 People's Republic of China Creighton University Omaha Nebraska 68178 USA Pusan National University Pusan Republic of Korea Universidade de Sao Paulo Sao Paulo Brazil University of California Berkeley California 94720 USA Institute of Physics Bhubaneswar 751005 India University of Texas Austin Texas 78712 USA Institute of High Energy Physics Protvino Russia Universidade Estadual de Campinas Sao Paulo Brazil University of Frankfurt Frankfurt Germany Indiana University Bloomington Indi

We present the first spin alignment measurements for the K*0(892) and ϕ(1020) vector mesons produced at midrapidity with transverse momenta up to 5 GeV/c at sNN=200 GeV at RHIC. The diagonal spin-density matrix elements with respect to the reaction plane in Au+Au collisions are ρ00=0.32±0.04 (stat) ± 0.09 (syst) for the K*0 (0.8

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ρ0 photoproduction in ultraperipheral relativistic heavy ion collisions at sNN=200 GeV

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Physical Review C 2008年第3期77卷 034910-034910页

作者： B. I. Abelev M. M. Aggarwal Z. Ahammed B. D. Anderson D. Arkhipkin G. S. Averichev Y. Bai J. Balewski O. Barannikova L. S. Barnby J. Baudot S. Baumgart D. R. Beavis R. Bellwied F. Benedosso R. R. Betts S. Bhardwaj A. Bhasin A. K. Bhati H. Bichsel J. Bielcik J. Bielcikova L. C. Bland S.-L. Blyth M. Bombara B. E. Bonner M. Botje J. Bouchet E. Braidot A. V. Brandin S. Bueltmann T. P. Burton M. Bystersky X. Z. Cai H. Caines M. Calderón de la Barca Sánchez J. Callner O. Catu D. Cebra M. C. Cervantes Z. Chajecki P. Chaloupka S. Chattopadhyay H. F. Chen J. H. Chen J. Y. Chen J. Cheng M. Cherney A. Chikanian K. E. Choi W. Christie S. U. Chung R. F. Clarke M. J. M. Codrington J. P. Coffin T. M. Cormier M. R. Cosentino J. G. Cramer H. J. Crawford D. Das S. Dash M. Daugherity M. M. de Moura T. G. Dedovich M. DePhillips A. A. Derevschikov R. Derradi de Souza L. Didenko T. Dietel P. Djawotho S. M. Dogra X. Dong J. L. Drachenberg J. E. Draper F. Du J. C. Dunlop M. R. Dutta Mazumdar W. R. Edwards L. G. Efimov E. Elhalhuli V. Emelianov J. Engelage G. Eppley B. Erazmus M. Estienne L. Eun P. Fachini R. Fatemi J. Fedorisin A. Feng P. Filip E. Finch V. Fine Y. Fisyak J. Fu C. A. Gagliardi L. Gaillard M. S. Ganti E. Garcia-Solis V. Ghazikhanian P. Ghosh Y. N. Gorbunov A. Gordon O. Grebenyuk D. Grosnick B. Grube S. M. Guertin K. S. F. F. Guimaraes A. Gupta N. Gupta W. Guryn B. Haag T. J. Hallman A. Hamed J. W. Harris W. He M. Heinz T. W. Henry S. Hepplemann B. Hippolyte A. Hirsch E. Hjort A. M. Hoffman G. W. Hoffmann D. J. Hofman R. S. Hollis M. J. Horner H. Z. Huang E. W. Hughes T. J. Humanic G. Igo A. Iordanova P. Jacobs W. W. Jacobs P. Jakl F. Jin P. G. Jones E. G. Judd S. Kabana K. Kajimoto K. Kang J. Kapitan M. Kaplan D. Keane A. Kechechyan D. Kettler V. Yu. Khodyrev J. Kiryluk A. Kisiel S. R. Klein A. G. Knospe A. Kocoloski D. D. Koetke T. Kollegger M. Kopytine L. Kotchenda V. Kouchpil K. L. Kowalik P. Kravtsov V. I. Kravtsov K. Krueger C. Kuhn A. Kumar P. Kurnadi M. A. C. Lamont J. M. Landgraf S. Lange S. LaPointe F. Laue J. La University of Illinois at Chicago Chicago Illinois 60607 USA Panjab University Chandigarh 160014 India Variable Energy Cyclotron Centre Kolkata 700064 India Kent State University Kent Ohio 44242 USA Particle Physics Laboratory (JINR) Dubna Russia Laboratory for High Energy (JINR) Dubna Russia NIKHEF and Utrecht University Amsterdam The Netherlands Indiana University Bloomington Indiana 47408 USA University of Birmingham Birmingham United Kingdom Institut de Recherches Subatomiques Strasbourg France Yale University New Haven Connecticut 06520 USA Brookhaven National Laboratory Upton New York 11973 USA Wayne State University Detroit Michigan 48201 USA University of Rajasthan Jaipur 302004 India University of Jammu Jammu 180001 India University of Washington Seattle Washington 98195 USA Nuclear Physics Institute AS CR 250 68 Řež Prague Czech Republic Lawrence Berkeley National Laboratory Berkeley California 94720 USA Rice University Houston Texas 77251 USA SUBATECH Nantes France Moscow Engineering Physics Institute Moscow Russia Shanghai Institute of Applied Physics Shanghai 201800 China University of California Davis California 95616 USA Texas A&M University College Station Texas 77843 USA Ohio State University Columbus Ohio 43210 USA University of Science & Technology of China Hefei 230026 China Institute of Particle Physics CCNU (HZNU) Wuhan 430079 China Tsinghua University Beijing 100084 China Creighton University Omaha Nebraska 68178 USA Pusan National University Pusan Republic of Korea Universidade de Sao Paulo Sao Paulo Brazil University of California Berkeley California 94720 USA Institute of Physics Bhubaneswar 751005 India University of Texas Austin Texas 78712 USA Institute of High Energy Physics Protvino Russia Universidade Estadual de Campinas Sao Paulo Brazil University of Frankfurt Frankfurt Germany Pennsylvania State University University Park Pennsylvania 16802 USA University of Kentucky Lexington Kentuck

Photoproduction reactions occur when the electromagnetic field of a relativistic heavy ion interacts with another heavy ion. The STAR Collaboration presents a measurement of ρ0 and direct π+π− photoproduction in ultraperipheral relativistic heavy ion collisions at sNN=200 GeV. We observe both exclusive photoproduction and photoproduction accompanied by mutual Coulomb excitation. We find a coherent cross section of σ(AuAu→Au*Au*ρ0)=530±19(stat.)±57(syst.) mb, in accord with theoretical calculations based on a Glauber approach, but considerably below the predictions of a color dipole model. The ρ0 transverse momentum spectrum (pT2) is fit by a double exponential curve including both coherent and incoherent coupling to the target nucleus; we find σinc/σcoh=0.29±0.03(stat.)±0.08(syst.). The ratio of direct π+π− to ρ0 production is comparable to that observed in γp collisions at HERA and appears to be independent of photon energy. Finally, the measured ρ0 spin helicity matrix elements agree within errors with the expected s-channel helicity conservation.

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