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K/π Fluctuations at Relativistic Energies

Physical Review Letters 2009年第9期103卷 092301-092301页

作者： B. I. Abelev M. M. Aggarwal Z. Ahammed B. D. Anderson D. Arkhipkin G. S. Averichev J. Balewski O. Barannikova L. S. Barnby J. Baudot S. Baumgart D. R. Beavis R. Bellwied F. Benedosso M. J. Betancourt R. R. Betts 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 E. Bruna S. Bueltmann T. P. Burton M. Bystersky X. Z. Cai H. Caines M. Calderón de la Barca Sánchez 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 R. F. Clarke M. J. M. Codrington R. Corliss T. M. Cormier M. R. Cosentino J. G. Cramer H. J. Crawford D. Das S. Das S. Dash M. Daugherity L. C. De Silva T. G. Dedovich M. DePhillips A. A. Derevschikov R. Derradi de Souza L. Didenko P. Djawotho S. M. Dogra X. Dong J. L. Drachenberg J. E. Draper 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. J. Garcia-Solis A. Geromitsos F. Geurts 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 E. Hjort A. M. Hoffman G. W. Hoffmann D. J. Hofman R. S. Hollis H. Z. Huang T. J. Humanic L. Huo G. Igo A. Iordanova P. Jacobs W. W. Jacobs P. Jakl C. Jena F. Jin C. L. Jones P. G. Jones J. Joseph E. G. Judd S. Kabana K. Kajimoto K. Kang J. Kapitan D. Keane A. Kechechyan D. Kettler V. Yu. Khodyrev D. P. Kikola J. Kiryluk A. Kisiel S. R. Klein A. G. Knospe A. Kocoloski D. D. Koetke M. Kopytine W. Korsch L. Kotchenda V. Kouchpil P. Kravtsov V. I. Kravtsov K. Krueger M. Krus C. Kuhn L. Kumar P. Kurnadi M. A. C. Lamont J. M. Landgraf S. LaPoin 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 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 NIKHEF and Utrecht University Amsterdam The Netherlands 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 Old Dominion University Norfolk Virginia 23529 USA 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 Lawrence Berkeley National Laboratory Berkeley California 94720 USA SUBATECH Nantes France Pennsylvania State University University Park Pennsylvania 1

We report K/π fluctuations from Au+Au collisions at sNN=19.6, 62.4, 130, and 200 GeV using the STAR detector at the Relativistic Heavy Ion Collider. K/π fluctuations in central collisions show little dependence on incident energy and are on the same order as those from NA49 at the Super Proton Synchrotron in central Pb+Pb collisions at sNN=12.3 and 17.3 GeV. We report results for the collision centrality dependence of K/π fluctuations and results for charge-separated fluctuations. We observe that the K/π fluctuations scale with the charged particle multiplicity density.

关键词： Heavy ions

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Observation of Two-Source Interference in the Photoproduction Reaction AuAu→AuAuρ0

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Physical Review Letters 2009年第11期102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 D. R. Beavis R. Bellwied F. Benedosso M. J. Betancourt 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 E. Bruna 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 R. Corliss T. M. Cormier M. R. Cosentino J. G. Cramer H. J. Crawford D. Das S. Dash M. Daugherity C. De Silva T. G. Dedovich M. DePhillips A. A. Derevschikov R. Derradi de Souza L. Didenko 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 E. Hjort A. M. Hoffman G. W. Hoffmann D. J. Hofman R. S. Hollis H. Z. Huang T. J. Humanic G. Igo A. Iordanova P. Jacobs W. W. Jacobs P. Jakl F. Jin C. L. Jones P. G. Jones J. Joseph E. G. Judd S. Kabana K. Kajimoto K. Kang J. Kapitan M. Kaplan D. Keane A. Kechechyan D. Kettler V. Yu. Khodyrev D. P. Kikola J. Kiryluk A. Kisiel S. R. Klein A. G. Knospe A. Kocoloski D. D. Koetke M. Kopytine L. Kotchenda V. Kouchpil P. Kravtsov V. I. Kravtsov K. Krueger M. Krus C. Kuhn L. Kumar P. Kurnadi M. A. C. Lamont J. M. Landgraf University of Illinois at Chicago Chicago Illinois 60607 USA Panjab University Chandigarh 160014 India Variable Energy Cyclotron Center 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 Old Dominion University Norfolk Virginia 23529 USA 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 Lawrence Berkeley National Laboratory Berkeley California 94720 USA SUBATECH Nantes France Pennsylvania

In ultraperipheral relativistic heavy-ion collisions, a photon from the electromagnetic field of one nucleus can fluctuate to a quark-antiquark pair and scatter from the other nucleus, emerging as a ρ0. The ρ0 production occurs in two well-separated (median impact parameters of 20 and 40 F for the cases considered here) nuclei, so the system forms a two-source interferometer. At low transverse momenta, the two amplitudes interfere destructively, suppressing ρ0 production. Since the ρ0 decays before the production amplitudes from the two sources can overlap, the two-pion system can only be described with an entangled nonlocal wave function, and is thus an example of the Einstein-Podolsky-Rosen paradox. We observe this suppression in 200 GeV per nucleon-pair gold-gold collisions. The interference is 87%±5%(stat.)±8%(syst.) of the expected level. This translates into a limit on decoherence due to wave function collapse or other factors of 23% at the 90% confidence level.

关键词： Heavy ions

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Growth of Long Range Forward-Backward Multiplicity Correlations with Centrality in Au+Au Collisions at sNN=200 GeV

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Physical Review Letters 2009年第17期103卷 172301-172301页

作者： B. I. Abelev M. M. Aggarwal Z. Ahammed B. D. Anderson D. Arkhipkin G. S. Averichev J. Balewski O. Barannikova L. S. Barnby J. Baudot S. Baumgart D. R. Beavis R. Bellwied F. Benedosso M. J. Betancourt R. R. Betts 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 E. Bruna S. Bueltmann T. P. Burton M. Bystersky X. Z. Cai H. Caines M. Calderón de la Barca Sánchez 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 R. F. Clarke M. J. M. Codrington R. Corliss T. M. Cormier M. R. Cosentino J. G. Cramer H. J. Crawford D. Das S. Dash M. Daugherity L. C. De Silva T. G. Dedovich M. DePhillips A. A. Derevschikov R. Derradi de Souza L. Didenko 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. J. Garcia-Solis A. Geromitsos F. Geurts 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 E. Hjort A. M. Hoffman G. W. Hoffmann D. J. Hofman R. S. Hollis H. Z. Huang T. J. Humanic L. Huo G. Igo A. Iordanova P. Jacobs W. W. Jacobs P. Jakl C. Jena F. Jin C. L. Jones P. G. Jones J. Joseph E. G. Judd S. Kabana K. Kajimoto K. Kang J. Kapitan D. Keane A. Kechechyan D. Kettler V. Yu. Khodyrev D. P. Kikola J. Kiryluk A. Kisiel A. G. Knospe A. Kocoloski D. D. Koetke M. Kopytine W. Korsch L. Kotchenda V. Kouchpil P. Kravtsov V. I. Kravtsov K. Krueger M. Krus C. Kuhn L. Kumar P. Kurnadi M. A. C. Lamont J. M. Landgraf S. LaPointe J. Lauret 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 Massachusetts Institute of Technology Cambridge Massachusetts A 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 NIKHEF and Utrecht University Amsterdam The Netherlands 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 Old Dominion University Norfolk Virginia 23529 USA 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 Lawrence Berkeley National Laboratory Berkeley California 94720 USA SUBATECH Nantes France Pennsylvania State University University Park Pennsylvania

Forward-backward multiplicity correlation strengths have been measured with the STAR detector for Au+Au and p+p collisions at sNN=200 GeV. Strong short- and long-range correlations (LRC) are seen in central Au+Au collisions. The magnitude of these correlations decrease with decreasing centrality until only short-range correlations are observed in peripheral Au+Au collisions. Both the dual parton model (DPM) and the color glass condensate (CGC) predict the existence of the long-range correlations. In the DPM, the fluctuation in the number of elementary (parton) inelastic collisions produces the LRC. In the CGC, longitudinal color flux tubes generate the LRC. The data are in qualitative agreement with the predictions of the DPM and indicate the presence of multiple parton interactions.

关键词： Atomic physics

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Measurements of ϕ meson production in relativistic heavy-ion collisions at the BNL Relativistic Heavy Ion Collider (RHIC)

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Physical Review C 2009年第6期79卷 064903-064903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 S. -L. Blyth M. Bombara B. E. Bonner M. Botje J. Bouchet E. Braidot A. V. Brandin E. Bruna 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 C. De Silva T. G. Dedovich M. DePhillips A. A. Derevschikov R. Derradi de Souza L. Didenko 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 T. J. Humanic G. Igo A. Iordanova P. Jacobs W. W. Jacobs P. Jakl F. Jin P. G. Jones J. Joseph 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 M. Kopytine L. Kotchenda V. Kouchpil P. Kravtsov V. I. Kravtsov K. Krueger M. Krus C. Kuhn L. Kumar P. Kurnadi M. A. C. Lamont J. M. Landgraf S. LaPointe J. Lauret A. Lebedev R. Lednicky C. - 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 CZ-25068 Řež/Prague Czech Republic University of California Los Angeles California 90095 USA Lawrence Berkeley National Laboratory Berkeley California 94720 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 Indiana U

We present results for the measurement of ϕ meson production via its charged kaon decay channel ϕ→K+K− in Au+Au collisions at sNN=62.4,130, and 200 GeV, and in p+p and d+Au collisions at sNN=200 GeV from the STAR experiment at the BNL Relativistic Heavy Ion Collider (RHIC). The midrapidity (|y|<0.5) ϕ meson transverse momentum (pT) spectra in central Au+Au collisions are found to be well described by a single exponential distribution. On the other hand, the pT spectra from p+p, d+Au, and peripheral Au+Au collisions show power-law tails at intermediate and high pT and are described better by Levy distributions. The constant ϕ/K− yield ratio vs beam species, collision centrality, and colliding energy is in contradiction with expectations from models having kaon coalescence as the dominant mechanism for ϕ production at RHIC. The Ω/ϕ yield ratio as a function of pT is consistent with a model based on the recombination of thermal s quarks up to pT~4 GeV/c, but disagrees at higher transverse momenta. The measured nuclear modification factor, RdAu, for the ϕ meson increases above unity at intermediate pT, similar to that for pions and protons, while RAA is suppressed due to the energy loss effect in central Au+Au collisions. Number of constituent quark scaling of both Rcp and v2 for the ϕ meson with respect to other hadrons in Au+Au collisions at sNN=200 GeV at intermediate pT is observed. These observations support quark coalescence as being the dominant mechanism of hadronization in the intermediate pT region at RHIC.

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Pion interferometry in Au+Au and Cu+Cu collisions at sNN=62.4 and 200 GeV

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Physical Review C 2009年第2期80卷 024905-024905页

作者： B. I. Abelev M. M. Aggarwal Z. Ahammed B. D. Anderson D. Arkhipkin G. S. Averichev J. Balewski O. Barannikova L. S. Barnby J. Baudot S. Baumgart D. R. Beavis R. Bellwied F. Benedosso M. J. Betancourt R. R. Betts 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 E. Bruna S. Bueltmann T. P. Burton M. Bystersky X. Z. Cai H. Caines M. Calderón de la Barca Sánchez 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 R. F. Clarke M. J. M. Codrington R. Corliss T. M. Cormier M. R. Cosentino J. G. Cramer H. J. Crawford D. Das S. Dash M. Daugherity L. C. De Silva T. G. Dedovich M. DePhillips A. A. Derevschikov R. Derradi de Souza L. Didenko 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 M. S. Ganti D. R. Gangadharan E. J. Garcia-Solis A. Geromitsos F. Geurts 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 E. Hjort A. M. Hoffman G. W. Hoffmann D. J. Hofman R. S. Hollis H. Z. Huang T. J. Humanic G. Igo A. Iordanova P. Jacobs W. W. Jacobs P. Jakl C. Jena F. Jin C. L. Jones P. G. Jones J. Joseph E. G. Judd S. Kabana K. Kajimoto K. Kang J. Kapitan D. Keane A. Kechechyan D. Kettler V. Yu. Khodyrev D. P. Kikola J. Kiryluk A. Kisiel S. R. Klein A. G. Knospe A. Kocoloski D. D. Koetke M. Kopytine W. Korsch L. Kotchenda V. Kouchpil P. Kravtsov V. I. Kravtsov K. Krueger M. Krus C. Kuhn L. Kumar P. Kurnadi M. A. C. Lamont J. M. Landgraf S. LaPointe 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 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 NIKHEF and Utrecht University Amsterdam The Netherlands 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 Old Dominion University Norfolk Virginia 23529 USA 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 Lawrence Berkeley National Laboratory Berkeley California 94720 USA SUB

We present a systematic analysis of two-pion interferometry in Au+Au collisions at sNN=62.4 GeV and Cu+Cu collisions at sNN=62.4 and 200 GeV using the STAR detector at the Relativistic Heavy Ion Collider (RHIC). The multiplicity and transverse momentum dependences of the extracted correlation lengths (radii) are studied. The scaling with charged particle multiplicity of the apparent system volume at final interaction is studied for the RHIC energy domain. The multiplicity scaling of the measured correlation radii is found to be independent of colliding system and collision energy.

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Systematic measurements of identified particle spectra in pp, d+Au, and Au+Au collisions at the STAR detector

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Physical Review C 2009年第3期79卷 034909-034909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 E. Bruna 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 C. De Silva T. G. Dedovich M. DePhillips A. A. Derevschikov R. Derradi de Souza L. Didenko 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 E. Hjort A. M. Hoffman G. W. Hoffmann D. J. Hofman R. S. Hollis H. Z. Huang T. J. Humanic G. Igo A. Iordanova P. Jacobs W. W. Jacobs P. Jakl F. Jin P. G. Jones J. Joseph 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 M. Kopytine L. Kotchenda V. Kouchpil P. Kravtsov V. I. Kravtsov K. Krueger M. Krus C. Kuhn L. Kumar P. Kurnadi M. A. C. Lamont J. M. Landgraf S. LaPointe J. Lauret A. Lebedev R. Lednicky C.-H. Le 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 CZ-25068 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 Indiana University Bloomington Indiana 47408 USA Lawrence Berkeley National L

Identified charged-particle spectra of π±, K±, p, and p¯ at midrapidity (|y|<0.1) measured by the dE/dx method in the STAR (solenoidal tracker at the BNL Relativistic Heavy Ion Collider) time projection chamber are reported for pp and d+Au collisions at sNN=200 GeV and for Au+Au collisions at 62.4, 130, and 200 GeV. Average transverse momenta, total particle production, particle yield ratios, strangeness, and baryon production rates are investigated as a function of the collision system and centrality. The transverse momentum spectra are found to be flatter for heavy particles than for light particles in all collision systems; the effect is more prominent for more central collisions. The extracted average transverse momentum of each particle species follows a trend determined by the total charged-particle multiplicity density. The Bjorken energy density estimate is at least several GeV/fm3 for a formation time less than 1 fm/c. A significantly larger net-baryon density and a stronger increase of the net-baryon density with centrality are found in Au+Au collisions at 62.4 GeV than at the two higher energies. Antibaryon production relative to total particle multiplicity is found to be constant over centrality, but increases with the collision energy. Strangeness production relative to total particle multiplicity is similar at the three measured RHIC energies. Relative strangeness production increases quickly with centrality in peripheral Au+Au collisions, to a value about 50% above the pp value, and remains rather constant in more central collisions. Bulk freeze-out properties are extracted from thermal equilibrium model and hydrodynamics-motivated blast-wave model fits to the data. Resonance decays are found to have little effect on the extracted kinetic freeze-out parameters because of the transverse momentum range of our measurements. The extracted chemical freeze-out temperature is constant, independent of collision system or centrality; its value is close to the

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Measurement of D* mesons in jets from p+p collisions at s=200 GeV

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Physical Review D 2009年第11期79卷 112006-112006页

作者： B. I. Abelev M. M. Aggarwal Z. Ahammed B. D. Anderson D. Arkhipkin G. S. Averichev J. Balewski O. Barannikova L. S. Barnby J. Baudot S. Baumgart D. R. Beavis R. Bellwied F. Benedosso M. J. Betancourt R. R. Betts 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 E. Bruna S. Bueltmann T. P. Burton M. Bystersky X. Z. Cai H. Caines M. Calderón de la Barca Sánchez 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 R. F. Clarke M. J. M. Codrington R. Corliss T. M. Cormier M. R. Cosentino J. G. Cramer H. J. Crawford D. Das S. Dash M. Daugherity L. C. De Silva T. G. Dedovich M. DePhillips A. A. Derevschikov R. Derradi de Souza L. Didenko 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. J. Garcia-Solis A. Geromitsos F. Geurts 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 E. Hjort A. M. Hoffman G. W. Hoffmann D. J. Hofman R. S. Hollis H. Z. Huang T. J. Humanic G. Igo A. Iordanova P. Jacobs W. W. Jacobs P. Jakl C. Jena F. Jin C. L. Jones P. G. Jones J. Joseph E. G. Judd S. Kabana K. Kajimoto K. Kang J. Kapitan D. Keane A. Kechechyan D. Kettler V. Yu. Khodyrev D. P. Kikola J. Kiryluk A. Kisiel S. R. Klein A. G. Knospe A. Kocoloski D. D. Koetke M. Kopytine W. Korsch L. Kotchenda V. Kouchpil P. Kravtsov V. I. Kravtsov K. Krueger M. Krus C. Kuhn L. Kumar P. Kurnadi M. A. C. Lamont J. M. Landgraf S. LaPointe 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 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 NIKHEF and Utrecht University Amsterdam The Netherlands 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 Old Dominion University Norfolk Virginia 23529 USA 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 Lawrence Berkeley National Laboratory Berkeley California 94720 USA SUBATECH Nantes France Pennsylvania State University University Park Pennsylvania 1

We report the measurement of charged D* mesons in inclusive jets produced in proton-proton collisions at a center-of-mass energy s=200 GeV with the STAR experiment at the Relativistic Heavy Ion Collider. For D* meson...

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Beam-energy and system-size dependence of dynamical net charge fluctuations

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Physical Review C 2009年第2期79卷 024906-024906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 Moira T. G. Dedovich M. DePhillips A. A. Derevschikov R. Derradi de Souza L. Didenko T. Dictel 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 T. J. Hallman A. Hamed J. W. Harris W. He M. Heinz S. Heppelmann B. Hippolyte A. Hirsch E. Hjort A. M. Hoffman G. W. Hoffmann D. J. Hofman R. S. Hollis H. Z. Huang T. J. Humanic L. Huo G. Igo A. Iordanova P. Jacobs W. W. Jacobs P. Jakl C. Jena F. Jin C. L. Jones P. G. Jones J. Joseph 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 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. LaPointe F. Laue J. Lauret 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 University of California Los Angeles California 90095 USA Rice University Houston Texas 77251 USA Moscow Engineering Physics Institute Moscow Russia Old Dominion University Norfolk VA 23529 USA 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 Lawrence Berkeley National Laboratory Berke

We present measurements of net charge fluctuations in Au+Au collisions at sNN=19.6, 62.4, 130, and 200 GeV, Cu+Cu collisions at sNN=62.4 and 200 GeV, and p+p collisions at s=200 GeV using the dynamical net charge fluctuations measure ν+−,dyn. We observe that the dynamical fluctuations are nonzero at all energies and exhibit a modest dependence on beam energy. A weak system size dependence is also observed. We examine the collision centrality dependence of the net charge fluctuations and find that dynamical net charge fluctuations violate 1/Nch scaling but display approximate 1/Npart scaling. We also study the azimuthal and rapidity dependence of the net charge correlation strength and observe strong dependence on the azimuthal angular range and pseudorapidity widths integrated to measure the correlation.

关键词： MEAN TRANSVERSE-MOMENTUM BY-EVENT FLUCTUATIONS HEAVY-ION COLLISIONS QUARK-GLUON PLASMA nuclear COLLISIONS AU COLLISIONS MULTIPLICITY SIGNAL GEV/C

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Measurement of Bottom Versus Charm as a Function of Transverse Momentum with Electron-Hadron Correlations in p+p Collisions at s=200 GeV

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Physical Review Letters 2009年第8期103卷 082002-082002页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander K. Aoki L. Aphecetche R. Armendariz S. H. Aronson J. Asai E. T. Atomssa R. Averbeck T. C. Awes B. Azmoun V. Babintsev M. Bai G. Baksay L. Baksay A. Baldisseri K. N. Barish P. D. Barnes B. Bassalleck A. T. Basye S. Bathe S. Batsouli V. Baublis C. Baumann A. Bazilevsky S. Belikov R. Bennett A. Berdnikov Y. Berdnikov A. A. Bickley J. G. Boissevain H. Borel K. Boyle M. L. Brooks H. Buesching V. Bumazhnov G. Bunce S. Butsyk C. M. Camacho S. Campbell B. S. Chang W. C. Chang J.-L. Charvet S. Chernichenko J. Chiba C. Y. Chi M. Chiu I. J. Choi R. K. Choudhury T. Chujo P. Chung A. Churyn V. Cianciolo Z. Citron C. R. Cleven B. A. Cole M. P. Comets P. Constantin M. Csanád T. Csörgő T. Dahms S. Dairaku K. Das G. David M. B. Deaton K. Dehmelt H. Delagrange A. Denisov D. d’Enterria A. Deshpande E. J. Desmond O. Dietzsch A. Dion M. Donadelli O. Drapier A. Drees K. A. Drees A. K. Dubey A. Durum D. Dutta V. Dzhordzhadze Y. V. Efremenko J. Egdemir F. Ellinghaus W. S. Emam T. Engelmore A. Enokizono H. En’yo S. Esumi K. O. Eyser B. Fadem D. E. Fields M. Finger, Jr. M. Finger F. Fleuret S. L. Fokin Z. Fraenkel J. E. Frantz A. Franz A. D. Frawley K. Fujiwara Y. Fukao T. Fusayasu S. Gadrat I. Garishvili A. Glenn H. Gong M. Gonin J. Gosset Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji H.-Å. Gustafsson T. Hachiya A. Hadj Henni C. Haegemann J. S. Haggerty H. Hamagaki R. Han H. Harada E. P. Hartouni K. Haruna E. Haslum R. Hayano M. Heffner T. K. Hemmick T. Hester X. He H. Hiejima J. C. Hill R. Hobbs M. Hohlmann W. Holzmann K. Homma B. Hong T. Horaguchi D. Hornback S. Huang T. Ichihara R. Ichimiya Y. Ikeda K. Imai J. Imrek M. Inaba Y. Inoue D. Isenhower L. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov D. Ivanischev B. V. Jacak J. Jia J. Jin O. Jinnouchi B. M. Johnson K. S. Joo D. Jouan F. Kajihara S. Kametani N. Kamihara J. Kamin M. Kaneta J. H. Kang H. Kanou J. Kapustinsky D. Kawall A. V. Kazantsev T. Kempel A. Khanza University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 USA Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 USA Chemistry Department Stony Brook University Stony Brook SUNY New York 11794-3400 USA RIKEN Nishina Center for Accelerator-Based Science Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA New Mexico State University Las Cruces New Mexico 88003 USA Kyoto University Kyoto 606-8502 Japan SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) BP 20722 - 44307 Nantes France Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Collider-Accelerator Department Brookhaven National Laboratory Upton New York 11973-5000 USA Florida Institute of Technology Melbourne Florida 32901 USA Dapnia CEA Saclay F-91191 Gif-sur-Yvette France University of California - Riverside Riverside California 92521 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA University of New Mexico Albuquerque New Mexico 87131 USA Abilene Christian University Abilene Texas 79699 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region 188300 Russia Institut für Kernphysik University of Muenster D-48149 Muenster Germany Saint Petersburg State Polytechnic University St. Petersburg Russia Yonsei University IPAP Seoul 120-749 Korea Institute of Physics Academia Sinica Ta

The momentum distribution of electrons from semileptonic decays of charm and bottom quarks for midrapidity |y|<0.35 in p+p collisions at s=200 GeV is measured by the PHENIX experiment at the Relativistic Heavy Ion... 详细信息

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Gluon-Spin Contribution to the Proton Spin from the Double-Helicity Asymmetry in Inclusive π0 Production in Polarized p+p Collisions at s=200 GeV

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Physical Review Letters 2009年第1期103卷 012003-012003页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander K. Aoki L. Aphecetche J. Asai E. T. Atomssa R. Averbeck T. C. Awes B. Azmoun V. Babintsev M. Bai G. Baksay L. Baksay A. Baldisseri K. N. Barish P. D. Barnes B. Bassalleck A. T. Basye S. Bathe S. Batsouli V. Baublis C. Baumann A. Bazilevsky S. Belikov R. Bennett A. Berdnikov Y. Berdnikov A. A. Bickley J. G. Boissevain H. Borel K. Boyle M. L. Brooks H. Buesching V. Bumazhnov G. Bunce S. Butsyk C. M. Camacho S. Campbell P. Chand B. S. Chang W. C. Chang J.-L. Charvet S. Chernichenko C. Y. Chi M. Chiu I. J. Choi R. K. Choudhury T. Chujo P. Chung A. Churyn V. Cianciolo Z. Citron B. A. Cole P. Constantin M. Csanád T. Csörgő T. Dahms S. Dairaku K. Das G. David A. Denisov D. d’Enterria A. Deshpande E. J. Desmond O. Dietzsch A. Dion M. Donadelli O. Drapier A. Drees K. A. Drees A. K. Dubey A. Durum D. Dutta V. Dzhordzhadze Y. V. Efremenko J. Egdemir F. Ellinghaus T. Engelmore A. Enokizono H. En’yo S. Esumi K. O. Eyser B. Fadem D. E. Fields M. Finger M. Finger, Jr. F. Fleuret S. L. Fokin Z. Fraenkel J. E. Frantz A. Franz A. D. Frawley K. Fujiwara Y. Fukao T. Fusayasu I. Garishvili A. Glenn H. Gong M. Gonin J. Gosset Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji H.-Å. Gustafsson A. Hadj Henni J. S. Haggerty H. Hamagaki R. Han E. P. Hartouni K. Haruna E. Haslum R. Hayano M. Heffner T. K. Hemmick T. Hester X. He J. C. Hill M. Hohlmann W. Holzmann K. Homma B. Hong T. Horaguchi D. Hornback S. Huang T. Ichihara R. Ichimiya Y. Ikeda K. Imai J. Imrek M. Inaba D. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov D. Ivanischev B. V. Jacak J. Jia J. Jin B. M. Johnson K. S. Joo D. Jouan F. Kajihara S. Kametani N. Kamihara J. Kamin J. H. Kang J. Kapustinsky D. Kawall A. V. Kazantsev T. Kempel A. Khanzadeev K. M. Kijima J. Kikuchi B. I. Kim D. H. Kim D. J. Kim E. Kim S. H. Kim E. Kinney K. Kiriluk A. Kiss E. Kistenev J. Klay C. Klein-Boesing L. Kochenda V. Kochetkov B. Komkov M. Konno J. Koster A. Kozlov A. Král A. Krav University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 USA Chemistry Department Stony Brook University Stony Brook SUNY New York 11794-3400 USA RIKEN Nishina Center for Accelerator-Based Science Wako Saitama 351-0198 JAPAN RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA New Mexico State University Las Cruces New Mexico 88003 USA Kyoto University Kyoto 606-8502 Japan SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) BP 20722 - 44307 Nantes France Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794 USA. Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Collider-Accelerator Department Brookhaven National Laboratory Upton New York 11973-5000 USA Florida Institute of Technology Melbourne Florida 32901 USA Dapnia CEA Saclay F-91191 Gif-sur-Yvette France University of California - Riverside Riverside California 92521 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA University of New Mexico Albuquerque New Mexico 87131 USA Abilene Christian University Abilene Texas 79699 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region 188300 Russia Institut für Kernphysik University of Muenster D-48149 Muenster Germany Saint Petersburg State Polytechnic University Saint Petersburg Russia Bhabha Atomic Research Centre Bombay 400 085 India Yonsei University IPAP Seoul 120-749 Korea Institute of Physics Academia Sinica Taipei 11529 Taiwan Columbia University New Y

The double helicity asymmetry in neutral pion production for pT=1 to 12 GeV/c was measured with the PHENIX experiment to access the gluon-spin contribution, ΔG, to the proton spin. Measured asymmetries are consistent with zero, and at a theory scale of μ2=4 GeV2 a next to leading order QCD analysis gives ΔG[0.02,0.3]=0.2, with a constraint of −0.7<ΔG[0.02,0.3]<0.5 at Δχ2=9 (∼3σ) for the sampled gluon momentum fraction (x) range, 0.02 to 0.3. The results are obtained using predictions for the measured asymmetries generated from four representative fits to polarized deep inelastic scattering data. We also consider the dependence of the ΔG constraint on the choice of the theoretical scale, a dominant uncertainty in these predictions.

关键词： Inelastic scattering

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