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Scaling Properties of Hyperon Production in Au+Au Collisions at sNN=200 GeV

Physical Review Letters 2007年第6期98卷 062301-062301页

作者： J. Adams M. M. Aggarwal Z. Ahammed J. Amonett B. D. Anderson M. Anderson D. Arkhipkin G. S. Averichev Y. Bai J. Balewski O. Barannikova L. S. Barnby J. Baudot S. Bekele V. V. Belaga A. Bellingeri-Laurikainen R. Bellwied B. I. Bezverkhny S. Bhardwaj A. Bhasin A. K. Bhati H. Bichsel J. Bielcik J. Bielcikova L. C. Bland C. O. Blyth S-L. Blyth B. E. Bonner M. Botje J. Bouchet A. V. Brandin A. Bravar M. Bystersky R. V. Cadman X. Z. Cai H. Caines M. Calderón de la Barca Sánchez J. Castillo O. Catu D. Cebra Z. Chajecki P. Chaloupka S. Chattopadhyay H. F. Chen J. H. Chen Y. Chen J. Cheng M. Cherney A. Chikanian H. A. Choi W. Christie J. P. Coffin T. M. Cormier M. R. Cosentino J. G. Cramer H. J. Crawford D. Das S. Das M. Daugherity M. M. de Moura T. G. Dedovich M. DePhillips A. A. Derevschikov L. Didenko T. Dietel P. Djawotho S. M. Dogra W. J. Dong X. Dong J. E. Draper F. Du V. B. Dunin J. C. Dunlop M. R. Dutta Mazumdar V. Eckardt W. R. Edwards L. G. Efimov V. Emelianov J. Engelage G. Eppley B. Erazmus M. Estienne P. Fachini R. Fatemi J. Fedorisin K. Filimonov P. Filip E. Finch V. Fine Y. Fisyak J. Fu C. A. Gagliardi L. Gaillard J. Gans M. S. Ganti V. Ghazikhanian P. Ghosh J. E. Gonzalez Y. G. Gorbunov H. Gos O. Grebenyuk D. Grosnick S. M. Guertin K. S. F. F. Guimaraes Y. Guo N. Gupta T. D. Gutierrez 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 G. W. Hoffmann M. J. Horner H. Z. Huang S. L. Huang E. W. Hughes T. J. Humanic G. Igo P. Jacobs W. W. Jacobs P. Jakl F. Jia H. Jiang P. G. Jones E. G. Judd S. Kabana K. Kang J. Kapitan M. Kaplan D. Keane A. Kechechyan V. Yu. Khodyrev B. C. Kim J. Kiryluk A. Kisiel E. M. Kislov S. R. Klein D. D. Koetke T. Kollegger M. Kopytine L. Kotchenda V. Kouchpil K. L. Kowalik M. Kramer P. Kravtsov V. I. Kravtsov K. Krueger C. Kuhn A. I. Kulikov A. Kumar A. A. Kuznetsov M. A. C. Lamont J. M. Landgraf S. Lange S. LaPointe F. Laue J. Lauret A. Lebedev R. Lednicky C-H. Lee S. Lehocka M. J. LeVine C. Li Q. Li Y. Li G. Lin S. J. University of Birmingham Birmingham United Kingdom Panjab University Chandigarh 160014 India Variable Energy Cyclotron Centre Kolkata 700064 India Kent State University Kent Ohio 44242 USA University of California Davis California 95616 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 Institut de Recherches Subatomiques Strasbourg France Ohio State University Columbus Ohio 43210 USA SUBATECH Nantes France Wayne State University Detroit Michigan 48201 USA Yale University New Haven Connecticut 06520 USA University of Rajasthan Jaipur 302004 India University of Jammu Jammu 180001 India University of Washington Seattle Washington 98195 USA Brookhaven National Laboratory Upton New York 11973 USA Lawrence Berkeley National Laboratory Berkeley California 94720 USA Rice University Houston Texas 77251 USA Moscow Engineering Physics Institute Moscow Russia Nuclear Physics Institute AS CR 250 68 Řež/Prague Czech Republic Argonne National Laboratory Argonne Illinois 60439 USA Shanghai Institute of Applied Physics Shanghai 201800 China University of Science and Technology of China Hefei 230026 China University of California Los Angeles California 90095 USA 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 University of Texas Austin Texas 78712 USA Institute of High Energy Physics Protvino Russia University of Frankfurt Frankfurt Germany Max-Planck-Institut für Physik Munich Germany Massachusetts Institute of Technology Cambridge Massachusetts 02139-4307 USA Institute of Particle Physics CCNU (HZNU) Wuhan 430079 China Texas A&M University College Station Texas 77843 USA Warsaw University of Technology

We present the scaling properties of Λ, Ξ, and Ω in midrapidity Au+Au collisions at the Brookhaven National Laboratory Relativistic Heavy Ion Collider at sNN=200 GeV. The yield of multistrange baryons per participant nucleon increases from peripheral to central collisions more rapidly than that of Λ, indicating an increase of the strange-quark density of the matter produced. The strange phase-space occupancy factor γs approaches unity for the most central collisions. Moreover, the nuclear modification factors of p, Λ, and Ξ are consistent with each other for 2

关键词： Elementary particles

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Partonic Flow and ϕ-Meson Production in Au+Au Collisions at sNN=200 GeV

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Physical Review Letters 2007年第11期99卷 112301-112301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 V. V. Belaga A. Bellingeri-Laurikainen 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 A. V. Brandin A. Bravar T. P. Burton M. Bystersky R. V. Cadman X. Z. Cai H. Caines M. Calderón de la Barca Sánchez J. Callner O. Catu D. Cebra Z. Chajecki P. Chaloupka S. Chattopadhyay H. F. Chen J. H. Chen J. Y. Chen J. Cheng M. Cherney A. Chikanian W. Christie S. U. Chung 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 L. Didenko T. Dietel P. Djawotho S. M. Dogra X. Dong J. L. Drachenberg J. E. Draper F. Du V. B. Dunin J. C. Dunlop M. R. Dutta Mazumdar V. Eckardt W. R. Edwards L. G. Efimov V. Emelianov J. Engelage G. Eppley B. Erazmus M. Estienne 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 H. Gos O. Grebenyuk D. Grosnick B. Grube S. M. Guertin K. S. F. F. Guimaraes N. Gupta 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. Jia P. G. Jones E. G. Judd S. Kabana K. Kang J. Kapitan M. Kaplan D. Keane A. Kechechyan D. Kettler V. Yu. Khodyrev B. C. Kim J. Kiryluk A. Kisiel E. M. Kislov 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. I. Kulikov A. Kumar P. Kurnadi A. A. Kuznetsov M. A. C. Lamont J. M. Landgraf S. Lange S. LaPointe F. Laue J. Lauret A. Lebedev R. Lednicky C-H. 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 SUBATECH Nantes France 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 Brookhaven National Laboratory Upton New York 11973 USA Lawrence Berkeley National Laboratory Berkeley California 94720 USA Rice University Houston Texas 77251 USA Moscow Engineering Physics Institute Moscow Russia Nuclear Physics Institute AS CR 250 68 Řež/Prague Czech Republic Argonne National Laboratory Argonne Illinois 60439 USA Shanghai Institute of Applied Physics Shanghai 201800 China University of California Davis California 95616 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 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 University of Frankfurt Frankfurt Germany Texas A&M University College Station Texas 77843 USA Max-Planck-Institut für Physik Munich Germany Massachusetts Institute of Technology Cambridge Massachusetts 02139-4307 USA University of California Los Angel

We present first measurements of the ϕ-meson elliptic flow (v2(pT)) and high-statistics pT distributions for different centralities from sNN=200 GeV Au+Au collisions at RHIC. In minimum bias collisions the v2 of the ϕ meson is consistent with the trend observed for mesons. The ratio of the yields of the Ω to those of the ϕ as a function of transverse momentum is consistent with a model based on the recombination of thermal s quarks up to pT∼4 GeV/c, but disagrees at higher momenta. The nuclear modification factor (RCP) of ϕ follows the trend observed in the KS0 mesons rather than in Λ baryons, supporting baryon-meson scaling. These data are consistent with ϕ mesons in central Au+Au collisions being created via coalescence of thermalized s quarks and the formation of a hot and dense matter with partonic collectivity at RHIC.

关键词： Fluid mechanics

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Transverse Momentum and Centrality Dependence of High-pT Nonphotonic Electron Suppression in Au+Au Collisions at sNN=200 GeV

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Physical Review Letters 2007年第19期98卷 192301-192301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 V. V. Belaga A. Bellingeri-Laurikainen 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 A. V. Brandin A. Bravar T. P. Burton M. Bystersky R. V. Cadman X. Z. Cai H. Caines M. Calderón de la Barca Sánchez J. Callner O. Catu D. Cebra Z. Chajecki P. Chaloupka S. Chattopadhyay H. F. Chen J. H. Chen J. Y. Chen J. Cheng M. Cherney A. Chikanian W. Christie S. U. Chung 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 L. Didenko T. Dietel P. Djawotho S. M. Dogra X. Dong J. L. Drachenberg J. E. Draper F. Du V. B. Dunin J. C. Dunlop M. R. Dutta Mazumdar V. Eckardt W. R. Edwards L. G. Efimov V. Emelianov J. Engelage G. Eppley B. Erazmus M. Estienne 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 H. Gos O. Grebenyuk D. Grosnick S. M. Guertin K. S. F. F. Guimaraes N. Gupta 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. Hofman R. 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. Jia P. G. Jones E. G. Judd S. Kabana K. Kang J. Kapitan M. Kaplan D. Keane A. Kechechyan D. Kettler V. Yu. Khodyrev B. C. Kim J. Kiryluk A. Kisiel E. M. Kislov 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. I. Kulikov A. Kumar P. Kurnadi A. A. Kuznetsov M. A. C. Lamont J. M. Landgraf S. Lange S. LaPointe F. Laue J. Lauret A. Lebedev R. Lednicky C.-H. Lee S. Lehocka University of Illinois Chicago Illinois 61801 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 SUBATECH Nantes France 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 Brookhaven National Laboratory Upton New York 11973 USA Lawrence Berkeley National Laboratory Berkeley California 94720 USA Rice University Houston Texas 77251 USA Moscow Engineering Physics Institute Moscow Russia Nuclear Physics Institute AS CR 250 68 Řež/Prague Czech Republic Argonne National Laboratory Argonne Illinois 60439 USA Shanghai Institute of Applied Physics Shanghai 201800 China University of California Davis California 95616 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 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 University of Frankfurt Frankfurt Germany Texas A&M University College Station Texas 77843 USA Max-Planck-Institut für Physik Munich Germany Massachusetts Institute of Technology Cambridge Massachusetts 02139-4307 USA University of California Los Angeles Califor

The STAR collaboration at the BNL Relativistic Heavy-Ion Collider (RHIC) reports measurements of the inclusive yield of nonphotonic electrons, which arise dominantly from semileptonic decays of heavy flavor mesons, ov... 详细信息

关键词： Heavy ions

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Mass, quark-number, and sNN dependence of the second and fourth flow harmonics in ultrarelativistic nucleus-nucleus collisions

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Physical Review C 2007年第5期75卷 054906-054906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 S. Bekele V. V. Belaga A. Bellingeri-Laurikainen 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 A. V. Brandin A. Bravar T. P. Burton M. Bystersky R. V. Cadman X. Z. Cai H. Caines M. Calderón de la Barca Sánchez J. Callner J. Castillo O. Catu D. Cebra Z. Chajecki P. Chaloupka S. Chattopadhyay H. F. Chen J. H. Chen J. Cheng M. Cherney A. Chikanian W. Christie S. U. Chung J. P. Coffin T. M. Cormier M. R. Cosentino J. G. Cramer H. J. Crawford D. Das S. Das S. Dash M. Daugherity M. M. de Moura T. G. Dedovich M. DePhillips A. A. Derevschikov L. Didenko T. Dietel P. Djawotho S. M. Dogra X. Dong J. L. Drachenberg J. E. Draper F. Du V. B. Dunin J. C. Dunlop M. R. Dutta Mazumdar V. Eckardt W. R. Edwards L. G. Efimov V. Emelianov J. Engelage G. Eppley B. Erazmus M. Estienne P. Fachini R. Fatemi J. Fedorisin K. Filimonov 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 H. Gos O. Grebenyuk D. Grosnick S. M. Guertin K. S. F. F. Guimaraes N. Gupta 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. Hofman R. Hollis M. J. Horner H. Z. Huang S. L. Huang E. W. Hughes T. J. Humanic G. Igo A. Iordanova P. Jacobs W. W. Jacobs P. Jakl F. Jia P. G. Jones E. G. Judd S. Kabana K. Kang J. Kapitan M. Kaplan D. Keane A. Kechechyan D. Kettler V. Yu. Khodyrev B. C. Kim J. Kiryluk A. Kisiel E. M. Kislov 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. I. Kulikov A. Kumar P. Kurnadi A. A. Kuznetsov M. A. C. Lamont J. M. Landgraf S. Lange S. LaPointe F. Laue J. Lauret A. Lebed Yale University New Haven Connecticut 06520 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 Illinois Chicago USA University of Birmingham Birmingham United Kingdom Institut de Recherches Subatomiques Strasbourg France Ohio State University Columbus Ohio 43210 USA SUBATECH Nantes France 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 Brookhaven National Laboratory Upton New York 11973 USA Lawrence Berkeley National Laboratory Berkeley California 94720 USA Rice University Houston Texas 77251 USA Moscow Engineering Physics Institute Moscow Russia Nuclear Physics Institute AS CR 250 68 Řež/Prague Czech Republic Argonne National Laboratory Argonne Illinois 60439 USA Shanghai Institute of Applied Physics Shanghai 201800 People's Republic of China University of California Davis California 95616 USA University of Science & Technology of China Hefei 230026 People's Republic of China Tsinghua University Beijing 100084 People's Republic of China Creighton University Omaha Nebraska 68178 USA 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 University of Frankfurt Frankfurt Germany Texas A&M University College Station Texas 77843 USA Max-Planck-Institut für Physik Munich Germany Massachusetts Institute of Technology Cambridge Massachusetts 02139-4307 USA Institute of Particle Physics CCNU (HZNU) Wuhan 430079 Peopl

We present STAR measurements of the azimuthal anisotropy parameter v2 for pions, kaons, protons, Λ,Λ¯,Ξ+Ξ¯, and Ω+Ω¯, along with v4 for pions, kaons, protons, and Λ+Λ¯ at midrapidity for Au+Au collisions at sNN=62.4 and 200 GeV. The v2(pT) values for all hadron species at 62.4 GeV are similar to those observed in 130 and 200 GeV collisions. For observed kinematic ranges, v2 values at 62.4, 130, and 200 GeV are as little as 10–15% larger than those in Pb+Pb collisions at sNN=17.3 GeV. At intermediate transverse momentum (pT from 1.5–5 GeV/c), the 62.4 GeV v2(pT) and v4(pT) values are consistent with the quark-number scaling first observed at 200 GeV. A four-particle cumulant analysis is used to assess the nonflow contributions to pions and protons and some indications are found for a smaller nonflow contribution to protons than pions. Baryon v2 is larger than antibaryon v2 at 62.4 and 200 GeV, perhaps indicating either that the initial spatial net-baryon distribution is anisotropic, that the mechanism leading to transport of baryon number from beam- to midrapidity enhances v2 or that antibaryon and baryon annihilation is larger in the in-plane direction.

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Exploration and safety evaluation on Panzhihua iron barren rock with physical geographical methods

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Chinese Journal Of Geochemistry 2006年第B8期25卷 37-37页

作者： Xianguo TUO Wan LEI Zhengqi XU Jinxi LI Keliang MU College of Information Engineering Chengdu University of Technology Chengdu 610059 China The College of Applied Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu 610059 China

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Global polarization measurement in Au+Au collisions

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Physical Review C 2007年第2期76卷 024915-024915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 V. V. Belaga A. Bellingeri-Laurikainen 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 A. V. Brandin 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 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 L. Didenko T. Dietel P. Djawotho S. M. Dogra X. Dong J. L. Drachenberg J. E. Draper F. Du V. B. Dunin J. C. Dunlop M. R. Dutta Mazumdar W. R. Edwards L. G. Efimov V. Emelianov J. Engelage G. Eppley B. Erazmus M. Estienne 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 H. Gos O. Grebenyuk D. Grosnick B. Grube S. M. Guertin K. S. F. F. Guimaraes A. Gupta N. Gupta 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 P. G. Jones E. G. Judd S. Kabana K. Kang J. Kapitan M. Kaplan D. Keane A. Kechechyan D. Kettler V. Yu. Khodyrev J. Kiryluk A. Kisiel E. M. Kislov 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. I. Kulikov A. Kumar P. Kurnadi A. A. Kuznetsov M. A. C. Lamont J. M. Landgraf S. Lange S. LaPointe F. Laue J. Lauret A. Lebedev R. Lednic 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 SUBATECH Nantes France 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 Brookhaven National Laboratory Upton New York 11973 USA Lawrence Berkeley National Laboratory Berkeley California 94720 USA Rice University Houston Texas 77251 USA Moscow Engineering Physics Institute Moscow Russia Nuclear Physics Institute AS CR 250 68 Řež/Prague Czech Republic 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 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 University of Frankfurt Frankfurt Germany Massachusetts Institute of Technology Cambridge MA 02139-4307 USA University of California Los Angeles California 90095 USA Warsaw

The system created in noncentral relativistic nucleus-nucleus collisions possesses large orbital angular momentum. Because of spin-orbit coupling, particles produced in such a system could become globally polarized along the direction of the system angular momentum. We present the results of Λ and Λ¯ hyperon global polarization measurements in Au+Au collisions at sNN=62.4 and 200 GeV performed with the STAR detector at the BNL Relativistic Heavy Ion Collider (RHIC). The observed global polarization of Λ and Λ¯ hyperons in the STAR acceptance is consistent with zero within the precision of the measurements. The obtained upper limit, |PΛ,Λ¯|⩽0.02, is compared with the theoretical values discussed recently in the literature.

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Strangelet search in Au+Au collisions at sNN=200 GeV

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Physical Review C 2007年第1期76卷 011901(R)-011901(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 V. V. Belaga A. Bellingeri-Laurikainen 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 A. V. Brandin A. Bravar T. P. Burton M. Bystersky R. V. Cadman X. Z. Cai H. Caines M. Calderón de la Barca Sánchez J. Callner O. Catu D. Cebra Z. Chajecki P. Chaloupka S. Chattopadhyay H. F. Chen J. H. Chen J. Y. Chen J. Cheng M. Cherney A. Chikanian W. Christie S. U. Chung 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 L. Didenko T. Dietel P. Djawotho S. M. Dogra X. Dong J. L. Drachenberg J. E. Draper F. Du V. B. Dunin J. C. Dunlop M. R. Dutta Mazumdar V. Eckardt W. R. Edwards L. G. Efimov V. Emelianov J. Engelage G. Eppley B. Erazmus M. Estienne 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 H. Gos O. Grebenyuk D. Grosnick S. M. Guertin K. S. F. F. Guimaraes N. Gupta 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. Hofman R. 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. Jia P. G. Jones E. G. Judd S. Kabana K. Kang J. Kapitan M. Kaplan D. Keane A. Kechechyan D. Kettler V. Yu. Khodyrev B. C. Kim J. Kiryluk A. Kisiel E. M. Kislov 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. I. Kulikov A. Kumar P. Kurnadi A. A. Kuznetsov M. A. C. Lamont J. M. Landgraf S. Lange S. LaPointe F. Laue J. Lauret A. Lebedev R. Lednicky C-H. Lee S. Lehocka University of Illinois Chicago Illinois 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 SUBATECH Nantes France 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 Brookhaven National Laboratory Upton New York 11973 USA Lawrence Berkeley National Laboratory Berkeley California 94720 USA Rice University Houston Texas 77251 USA Moscow Engineering Physics Institute Moscow Russia Nuclear Physics Institute AS CR 250 68 Řež/Prague Czech Republic Argonne National Laboratory Argonne Illinois 60439 USA Shanghai Institute of Applied Physics Shanghai 201800 People's Republic of China University of California Davis California 95616 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 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 University of Frankfurt Frankfurt Germany Texas A&M University College Station Texas 77843 USA Max-Planck-Institut für Physik Munich Germany Massachusetts Institute of Technology Cambridg

We have searched for strangelets in a triggered sample of 61 million central (top 4%) Au+Au collisions at sNN=200 GeV near beam rapidities at the STAR solenoidal tracker detector at the BNL Relativistic Heavy Ion Collider. We have sensitivity to metastable strangelets with lifetimes of order ⩾0.1 ns, in contrast to limits over ten times longer in BNL Alternating Gradient Synchrotron (AGS) studies and longer still at the CERN Super Proton Synchrotron (SPS). Upper limits of a few 10−6 to 10−7 per central Au+Au collision are set for strangelets with mass ≳30 GeV/c2.

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Strange particle production in p+p collisions at s=200 GeV

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Physical Review C 2007年第6期75卷 064901-064901页

作者： B. I. Abelev J. Adams M. M. Aggarwal Z. Ahammed J. Amonett B. D. Anderson M. Anderson D. Arkhipkin G. S. Averichev Y. Bai J. Balewski O. Barannikova L. S. Barnby J. Baudot S. Bekele V. V. Belaga A. Bellingeri-Laurikainen R. Bellwied F. Benedosso S. Bhardwaj A. Bhasin A. K. Bhati H. Bichsel J. Bielcik J. Bielcikova L. C. Bland S.-L. Blyth B. E. Bonner M. Botje J. Bouchet A. V. Brandin A. Bravar T. P. Burton M. Bystersky R. V. Cadman X. Z. Cai H. Caines M. Calderón de la Barca Sánchez J. Castillo O. Catu D. Cebra Z. Chajecki P. Chaloupka S. Chattopadhyay H. F. Chen J. H. Chen J. Cheng M. Cherney A. Chikanian W. Christie J. P. Coffin T. M. Cormier M. R. Cosentino J. G. Cramer H. J. Crawford D. Das S. Das S. Dash M. Daugherity M. M. de Moura T. G. Dedovich M. DePhillips A. A. Derevschikov L. Didenko T. Dietel P. Djawotho S. M. Dogra W. J. Dong X. Dong J. E. Draper F. Du V. B. Dunin J. C. Dunlop M. R. Dutta Mazumdar V. Eckardt W. R. Edwards L. G. Efimov V. Emelianov J. Engelage G. Eppley B. Erazmus M. Estienne P. Fachini R. Fatemi J. Fedorisin K. Filimonov P. Filip E. Finch V. Fine Y. Fisyak J. Fu C. A. Gagliardi L. Gaillard M. S. Ganti V. Ghazikhanian P. Ghosh J. E. Gonzalez Y. G. Gorbunov H. Gos O. Grebenyuk D. Grosnick S. M. Guertin K. S. F. F. Guimaraes A. Gupta T. D. Gutierrez 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 M. J. Horner H. Z. Huang S. L. Huang E. W. Hughes T. J. Humanic G. Igo P. Jacobs W. W. Jacobs P. Jakl F. Jia H. Jiang P. G. Jones E. G. Judd S. Kabana K. Kang J. Kapitan M. Kaplan D. Keane A. Kechechyan V. Yu. Khodyrev B. C. Kim J. Kiryluk A. Kisiel E. M. Kislov S. R. Klein A. Kocoloski D. D. Koetke T. Kollegger M. Kopytine L. Kotchenda V. Kouchpil K. L. Kowalik M. Kramer P. Kravtsov V. I. Kravtsov K. Krueger C. Kuhn A. I. Kulikov A. Kumar A. A. Kuznetsov M. A. C. Lamont J. M. Landgraf S. Lange S. LaPointe F. Laue J. Lauret A. Lebedev R. Lednicky C.-H. Lee S. Lehocka M. J. LeVine C. Li Q. Li Y. Li Yale University New Haven Connecticut 06520 USA University of Birmingham Birmingham United Kingdom Panjab University Chandigarh 160014 India Variable Energy Cyclotron Centre Kolkata 700064 India Kent State University Kent Ohio 44242 USA University of California Davis California 95616 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 Illinois Chicago Illinois USA Institut de Recherches Subatomiques Strasbourg France Ohio State University Columbus Ohio 43210 USA SUBATECH Nantes France 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 Brookhaven National Laboratory Upton New York 11973 USA Lawrence Berkeley National Laboratory Berkeley California 94720 USA Rice University Houston Texas 77251 USA Moscow Engineering Physics Institute Moscow Russia Nuclear Physics Institute AS CR 250 68 Řež/Prague Czech Republic Argonne National Laboratory Argonne Illinois 60439 USA Shanghai Institute of Applied Physics Shanghai 201800 People's Republic of China University of Science & Technology of China Hefei 230026 People's Republic of China Tsinghua University Beijing 100084 People's Republic of China Creighton University Omaha Nebraska 68178 USA 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 University of Frankfurt Frankfurt Germany University of California Los Angeles California 90095 USA Max-Planck-Institut für Physik Munich Germany Massachusetts Institute of Technology Cambridge Massachusetts 02139-4307 USA Institute of Particle Physics CCNU (HZNU) Wuha

We present strange particle spectra and yields measured at midrapidity in s=200 GeV proton-proton (p+p) collisions at the BNL Relativistic Heavy Ion Collider (RHIC). We find that the previously observed universal transverse mass (mT≡pT2+m2) scaling of hadron production in p+p collisions seems to break down at higher mT and that there is a difference in the shape of the mT spectrum between baryons and mesons. We observe midrapidity antibaryon to baryon ratios near unity for Λ and Ξ baryons and no dependence of the ratio on transverse momentum, indicating that our data do not yet reach the quark-jet dominated region. We show the dependence of the mean transverse momentum 〈pT〉 on measured charged particle multiplicity and on particle mass and infer that these trends are consistent with gluon-jet dominated particle production. The data are compared with previous measurements made at the CERN Super Proton Synchrotron and Intersecting Storage Rings and in Fermilab experiments and with leading-order and next-to-leading-order string fragmentation model predictions. We infer from these comparisons that the spectral shapes and particle yields from p+p collisions at RHIC energies have large contributions from gluon jets rather than from quark jets.

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Forward Λ production and nuclear stopping power in d+Au collisions at sNN=200 GeV

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Physical Review C 2007年第6期76卷 064904-064904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 V. V. Belaga A. Bellingeri-Laurikainen 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 A. V. Brandin A. Bravar 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 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 L. Didenko T. Dietel P. Djawotho S. M. Dogra X. Dong J. L. Drachenberg J. E. Draper F. Du V. B. Dunin J. C. Dunlop M. R. Dutta Mazumdar V. Eckardt W. R. Edwards L. G. Efimov V. Emelianov J. Engelage G. Eppley B. Erazmus M. Estienne 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 H. Gos O. Grebenyuk D. Grosnick B. Grube S. M. Guertin K. S. F. F. Guimaraes N. Gupta 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. Jia P. G. Jones E. G. Judd S. Kabana K. Kang J. Kapitan M. Kaplan D. Keane A. Kechechyan D. Kettler V. Yu. Khodyrev J. Kiryluk A. Kisiel E. M. Kislov 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. I. Kulikov A. Kumar P. Kurnadi A. A. Kuznetsov 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 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 SUBATECH Nantes France 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 Brookhaven National Laboratory Upton New York 11973 USA Lawrence Berkeley National Laboratory Berkeley California 94720 USA Rice University Houston Texas 77251 USA Moscow Engineering Physics Institute Moscow Russia Nuclear Physics Institute AS CR 250 68 Řež/Prague Czech Republic 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 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 University of Frankfurt Frankfurt Germany Max-Planck-Institut für Physik Munich Germany Massachusetts Institute of Technology Cambridge MA 02139-4307 USA University of Calif

We report the measurement of Λ and Λ¯ yields and inverse slope parameters in d+Au collisions at sNN=200 GeV at forward and backward rapidities (y=±2.75), using data from the STAR forward time projection chambers. The contributions of different processes to baryon transport and particle production are probed exploiting the inherent asymmetry of the d+Au system. Comparisons to model calculations show that baryon transport on the deuteron side is consistent with multiple collisions of the deuteron nucleons with gold participants. On the gold side, HIJING-based models without a hadronic rescattering phase do not describe the measured particle yields, while models that include target remnants or hadronic rescattering do. The multichain model can provide a good description of the net baryon density in d+Au collisions at energies currently available at the BNL Relativistic Heavy Ion Collider, and the derived parameters of the model agree with those from nuclear collisions at lower energies.

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Rapidity and species dependence of particle production at large transverse momentum for d+Au collisions at sNN=200 GeV

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Physical Review C 2007年第5期76卷 054903-054903页

作者： B. I. Abelev J. Adams M. M. Aggarwal Z. Ahammed J. Amonett B. D. Anderson M. Anderson D. Arkhipkin G. S. Averichev Y. Bai J. Balewski O. Barannikova L. S. Barnby J. Baudot S. Bekele V. V. Belaga A. Bellingeri-Laurikainen R. Bellwied F. Benedosso S. Bhardwaj A. Bhasin A. K. Bhati H. Bichsel J. Bielcik J. Bielcikova L. C. Bland S.-L. Blyth B. E. Bonner M. Botje J. Bouchet A. V. Brandin A. Bravar M. Bystersky R. V. Cadman X. Z. Cai H. Caines M. Calderón de la Barca Sánchez J. Castillo O. Catu D. Cebra Z. Chajecki P. Chaloupka S. Chattopadhyay H. F. Chen J. H. Chen J. Cheng M. Cherney A. Chikanian W. Christie J. P. Coffin T. M. Cormier M. R. Cosentino J. G. Cramer H. J. Crawford D. Das S. Das M. Daugherity M. M. de Moura T. G. Dedovich M. DePhillips A. A. Derevschikov L. Didenko T. Dietel P. Djawotho S. M. Dogra W. J. Dong X. Dong J. E. Draper F. Du V. B. Dunin J. C. Dunlop M. R. Dutta Mazumdar V. Eckardt W. R. Edwards L. G. Efimov V. Emelianov J. Engelage G. Eppley B. Erazmus M. Estienne P. Fachini R. Fatemi J. Fedorisin K. Filimonov P. Filip E. Finch V. Fine Y. Fisyak J. Fu C. A. Gagliardi L. Gaillard M. S. Ganti V. Ghazikhanian P. Ghosh J. E. Gonzalez Y. G. Gorbunov H. Gos O. Grebenyuk D. Grosnick S. M. Guertin K. S. F. F. Guimaraes Y. Guo N. Gupta T. D. Gutierrez 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 M. J. Horner H. Z. Huang S. L. Huang E. W. Hughes T. J. Humanic G. Igo P. Jacobs W. W. Jacobs P. Jakl F. Jia H. Jiang P. G. Jones E. G. Judd S. Kabana K. Kang J. Kapitan M. Kaplan D. Keane A. Kechechyan V. Yu. Khodyrev B. C. Kim J. Kiryluk A. Kisiel E. M. Kislov S. R. Klein A. Kocoloski D. D. Koetke T. Kollegger M. Kopytine L. Kotchenda V. Kouchpil K. L. Kowalik M. Kramer P. Kravtsov V. I. Kravtsov K. Krueger C. Kuhn A. I. Kulikov A. Kumar A. A. Kuznetsov M. A. C. Lamont J. M. Landgraf S. Lange S. LaPointe F. Laue J. Lauret A. Lebedev R. Lednicky C.-H. Lee S. Lehocka M. J. LeVine C. Li Q. Li Y. Li G. Lin X. Lin Yale University New Haven Connecticut 06520 USA University of Birmingham Birmingham United Kingdom Panjab University Chandigarh 160 014 India Variable Energy Cyclotron Centre Kolkata 700 064 India Kent State University Kent Ohio 44242 USA University of California Davis California 95616 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 Illinois Chicago USA Institut de Recherches Subatomiques Strasbourg France Ohio State University Columbus Ohio 43210 USA SUBATECH Nantes France Wayne State University Detroit Michigan 48201 USA University of Rajasthan Jaipur 302 004 India University of Jammu Jammu 180 001 India University of Washington Seattle Washington 98195 USA Brookhaven National Laboratory Upton New York 11973 USA Lawrence Berkeley National Laboratory Berkeley California 94720 USA Rice University Houston Texas 77251 USA Moscow Engineering Physics Institute Moscow Russia Nuclear Physics Institute AS CR 250 68 Řež/Prague Czech Republic Argonne National Laboratory Argonne Illinois 60439 USA Shanghai Institute of Applied Physics Shanghai 201800 People's Republic of China University of Science & Technology of China Hefei 230026 People's Republic of China Tsinghua University Beijing 100084 People's Republic of China Creighton University Omaha Nebraska 68178 USA Universidade de Sao Paulo Sao Paulo Brazil University of California Berkeley California 94720 USA University of Texas Austin Texas 78712 USA Institute of High Energy Physics Protvino Russia University of Frankfurt Frankfurt Germany University of California Los Angeles California 90095 USA Max-Planck-Institut für Physik Munich Germany Massachusetts Institute of Technology Cambridge Massachusetts 02139-4307 USA Institute of Particle Physics CCNU (HZNU) Wuhan 430079 People's Republic of China Texas A&M Univers

We determine rapidity asymmetry in the production of charged pions, protons, and antiprotons for large transverse momentum (pT) for d+Au collisions at sNN=200 GeV. The rapidity asymmetry is defined as the ratio of particle yields at backward rapidity (Au beam direction) to those at forward rapidity (d beam direction). The identified hadrons are measured in the rapidity regions |y|<0.5 and 0.5<|y|<1.0 for the pT range 2.5nuclear shadowing, saturation effects, and recombination and also to a phenomenological parton model. We find that asymmetries are sensitive to model parameters and show model preference. The rapidity dependence of π−/π+ and p¯/p ratios in peripheral d+Au and forward neutron-tagged events are used to study the contributions of valence quarks and gluons to particle production at high pT.

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