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Simulated scanning tunneling microscopy images of three-dimensional clusters: H8Si8O12 on Si(100)−2×1

Physical Review B 2004年第8期70卷 085402-085402页

作者： Yunqing Chen Kevin S. Schneider Mark M. Banaszak Holl B. G. Orr Physics Department Harrison M. Randall Laboratory The University of Michigan Ann Arbor Michigan 48109-1120 USA Chemistry Department The University of Michigan Ann Arbor Michigan 48109-1055 USA Applied Physics Program Harrison M. Randall Laboratory The University of Michigan Ann Arbor Michigan 48109-1120 USA

A scanning tunneling microscopy (STM) simulation based on the Bardeen perturbation method is used to generate simulated images of two possible chemisorption modes, monovertex and cracked cluster, for H8Si8O12 on Si(100)−2×1. The tip and sample are represented by cluster models, and electronic structure calculations are performed using density-functional theory. Simulated STM images are compared to experimental STM data acquired at nominally identical tunneling conditions. The simulated STM images elucidate the preferred monovertex attachment model, in addition to providing an understanding of the cluster features and apparent vertical and lateral dimensions observed in the experimental STM data.

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ESR of quantum spin chains with staggered fields

ESR of quantum spin chains with staggered fields

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作者： Asano, T. Ajiro, Y. Inagaki, Y. Nojiri, H. Sakon, T. Ishida, T. Nogami, T. Boucher, J.P. Motokawa, M. Department of Physics Kyushu University 6-10-1 Hakozki Higashi-ku Fukuoka 812-8581 Japan Kawaguchi Saitama 332-0012 Japan Graduate School of Science and Technology Kobe University Kobe 657-8501 Japan Department of Physics Okayama University Okayama 700-8530 Japan Department of Mechanical Engineering Akita University Akita 010-8502 Japan Department of Applied Physics and Chemistry University of Electro-Communications Chofu Tokyo 182-8585 Japan Laboratoire de Spectroméetrie Université J. Fourier BP 87 F-38402 Saint-Martin d'Heres Cedex France Institute for Materials Research Tohoku University Sendai 980-8577 Japan

We study electron spin resonance (ESR) of S = 1/2 antiferromagnetic Heisenberg chain systems, Cu-benzoate and Cu-pyrimidine, with staggered fields caused by alternating g-tensor and Dzyaloshinskii-Moriya interaction. We observe clearly the effect of the staggered fields on the shift and the linewidth of ESR spectra. Especially, in Cu-benzoate, we reveal the field-induced gap and the quantum critical behavior as a dynamical crossover. © 2003 Elsevier B.V. All rights reserved.

关键词： Antiferromagnetic materials

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Monolayer Pattern Evolution via Substrate Strain-Mediated Spinodal Decomposition

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Physical Review Letters 2004年第16期93卷 166104-166104页

作者： Kevin S. Schneider Wei Lu Thomas M. Owens Daniel R. Fosnacht M. M. Banaszak Holl B. G. Orr Chemistry Department The University of Michigan Ann Arbor Michigan 48109-1055 USA Mechanical Engineering Department The University of Michigan Ann Arbor Michigan 48109-2125 USA Applied Physics Program The Harrison M. Randall Laboratory The University of Michigan Ann Arbor Michigan 48109-1120 USA Physics Department The Harrison M. Randall Laboratory The University of Michigan Ann Arbor Michigan 48109-1120 USA

Investigations of octylsilane (C8H17SiH3) monolayer pattern formation on Au(111) are reported. Scanning tunneling microscopy data display the evolution of a ∼6 nm scale pattern of interwoven features concomitant with ejection of surface Au atoms and relaxation of the Au(111) 23×3 surface reconstruction. Numerical simulations suggest the surface dynamics are governed by a substrate strain-mediated spinodal decomposition mechanism, novel to organic monolayer formation. Collectively, the experimental and theoretical data indicate strain-inducing Si-Au bond interactions drive the pattern formation and the alkyl chains play a negligible role.

关键词： Self assembly

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Linear, Redox‐Active Pt6and Pt2Pd2Pt2Clusters†

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Angewandte Chemie 2004年第38期116卷

作者： Eri Goto Rowshan A. Begum Shuzhong Zhan Tomoaki Tanase Katsumi Tanigaki Ken Sakai Department of Chemistry Faculty of Science Nara Women's University Kitauoya‐higashi‐machi Nara 630‐8285 Japan Fax: (+81) 742‐20‐3399 Department of Physics Graduate School of Science Tohoku University Aoba‐ku Sendai 980‐8578 and CREST JST Japan Department of Applied Chemistry Faculty of Science Tokyo University of Science Kagurazaka 1‐3 Shinjuku‐ku Tokyo 162‐8601 Japan

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Visualization of Local Valence Structures in Quasi‐One‐Dimensional Halogen‐Bridged Complexes [Ni1−xPdx(chxn)2Br]Br2by STM†

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Angewandte Chemie 2004年第24期116卷

作者： Shinya Takaishi Hitoshi Miyasaka Ken‐ichi Sugiura Masahiro Yamashita Hiroyuki Matsuzaki Hideo Kishida Hiroshi Okamoto Hisaaki Tanaka Kazuhiro Marumoto Hiroshi Ito Shin‐ichi Kuroda Tomohide Takami Department of Chemistry Graduate School of Science Tokyo Metropolitan University and CREST (JST) 1‐1 Minamiosawa Hachioji Tokyo 192‐0397 Japan Fax: (+81) 426‐77‐2525 Department of Advanced Material Science Graduate School of Frontier Science The University of Tokyo Kashiwa Chiba 277‐8561 Japan Department of Applied Physics Graduate School of Engineering Nagoya University Furocho Chikusa‐ku Nagoya Aichi 464‐8603 Japan Visionarts Research Inc. 5‐3‐22 Minami‐aoyama Minato‐ku Tokyo 107‐0062 Japan

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[{[Pt(en)2][PtX2(en)2]}3][{(MX5)X3}2]⋅12 H2O: Quasi‐One‐Dimensional Halogen‐Bridged PtII–PtIVMixed‐Valence Compounds with Magnetic Counteranions†

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Angewandte Chemie 2004年第36期116卷

作者： Masahiro Yamashita Daisuke Kawakami Satoshi Matsunaga Yoshio Nakayama Mari Sasaki Shinya Takaishi Fumiyasu Iwahori Hitoshi Miyasaka Ken‐ichi Sugiura Yoshiki Wada Hiroshi Miyamae Hiroyuki Matsuzaki Hiroshi Okamoto Hisaaki Tanaka Kazuhiro Marumoto Shin‐ichi Kuroda Department of Chemistry Graduate School of Science Tokyo Metropolitan University and CREST(JST) 1‐1 Minamiosawa Hachioji Tokyo 192‐0397 Japan Fax: (+81) 426‐77‐2525 Advanced Materials Laboratory National Institute for Materials Science 1‐1 Namiki Tsukuba Ibaraki 305‐0044 Japan Faculty of Science Josai University 1‐1 Keyakidai Sakado Saitama 350‐0295 Japan Department of Advanced Materials Science Graduate School of Frontier Science The University of Tokyo Kashiwa Chiba 277‐8561 Japan Department of Applied Physics Graduate School of Engineering Nagoya University Furocho Chikusa‐ku Nagoya Aichi 464‐8603 Japan

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Direct Observation of Bonding and Charge Ordering in (EDO‐TTF)2PF6†

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Angewandte Chemie 2004年第28期116卷

作者： Shinobu Aoyagi Kenichi Kato Akira Ota Hideki Yamochi Gunzi Saito Hiroyoshi Suematsu Makoto Sakata Masaki Takata Department of Applied Physics Nagoya University Nagoya 464‐8603 Japan SPring‐8/JASRI Kouto Mikazuki Sayo Hyogo 679‐5198 Japan Fax: (+81) 791‐58‐0946 Division of Chemistry Graduate School of Science Kyoto University Sakyo‐ku Kyoto 606‐8502 Japan Research Center for Low Temperature and Materials Sciences Kyoto University Sakyo‐ku Kyoto 606‐8502 Japan

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Single identified hadron spectra from sNN=130GeV Au+Au collisions

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Physical Review C 2004年第2期69卷 024904-024904页

作者： K. Adcox S. S. Adler N. N. Ajitanand Y. Akiba J. Alexander L. Aphecetche Y. Arai S. H. Aronson R. Averbeck T. C. Awes K. N. Barish P. D. Barnes J. Barrette B. Bassalleck S. Bathe V. Baublis A. Bazilevsky S. Belikov F. G. Bellaiche S. T. Belyaev M. J. Bennett Y. Berdnikov S. Botelho M. L. Brooks D. S. Brown N. Bruner D. Bucher H. Buesching V. Bumazhnov G. Bunce J. M. Burward-Hoy S. Butsyk T. A. Carey P. Chand J. Chang W. C. Chang L. L. Chavez S. Chernichenko C. Y. Chi J. Chiba M. Chiu R. K. Choudhury T. Christ T. Chujo M. S. Chung P. Chung V. Cianciolo B. A. Cole D. G. d’Enterria G. David H. Delagrange A. Denisov A. Deshpande E. J. Desmond O. Dietzsch B. V. Dinesh A. Drees A. Durum D. Dutta K. Ebisu Y. V. Efremenko K. El Chenawi H. En’yo S. Esumi L. Ewell T. Ferdousi D. E. Fields S. L. Fokin Z. Fraenkel A. Franz A. D. Frawley S.-Y. Fung S. Garpman T. K. Ghosh A. Glenn A. L. Godoi Y. Goto S. V. Greene M. Grosse Perdekamp S. K. Gupta W. Guryn H.-Å. Gustafsson J. S. Haggerty H. Hamagaki A. G. Hansen H. Hara E. P. Hartouni R. Hayano N. Hayashi X. He T. K. Hemmick J. M. Heuser M. Hibino J. C. Hill D. S. Ho K. Homma B. Hong A. Hoover T. Ichihara K. Imai M. S. Ippolitov M. Ishihara B. V. Jacak W. Y. Jang J. Jia B. M. Johnson S. C. Johnson K. S. Joo S. Kametani J. H. Kang M. Kann S. S. Kapoor S. Kelly B. Khachaturov A. Khanzadeev J. Kikuchi D. J. Kim H. J. Kim S. Y. Kim Y. G. Kim W. W. Kinnison E. Kistenev A. Kiyomichi C. Klein-Boesing S. Klinksiek L. Kochenda V. Kochetkov D. Koehler T. Kohama D. Kotchetkov A. Kozlov P. J. Kroon K. Kurita M. J. Kweon Y. Kwon G. S. Kyle R. Lacey J. G. Lajoie J. Lauret A. Lebedev D. M. Lee M. J. Leitch X. H. Li Z. Li D. J. Lim M. X. Liu X. Liu Z. Liu C. F. Maguire J. Mahon Y. I. Makdisi V. I. Manko Y. Mao S. K. Mark S. Markacs G. Martinez M. D. Marx A. Masaike F. Matathias T. Matsumoto P. L. McGaughey E. Melnikov M. Merschmeyer F. Messer M. Messer Y. Miake T. E. Miller A. Milov S. Mioduszewski R. E. Mischke G. C. Mishra J. T. Mitchell A. K. Mohanty D. P. Morrison J. M. Moss F. Mühlbacher M. Vanderbilt University Nashville Tennessee 37235 USA Brookhaven National Laboratory Upton New York 11973-5000 USA Chemistry Department State University of New York Stony Brook New York 11794 USA KEK High Energy Accelerator Research Organization Tsukuba-shi Ibaraki-ken 305-0801 Japan SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) Boîte Postal 20722 - 44307 Nantes France Department of Physics and Astronomy State University of New York Stony Brook New York 11794 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA University of California Riverside California 92521 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Georgia State University Atlanta Georgia 30303 USA University of New Mexico Albuquerque New Mexico 87131 USA Institut für Kernphysik University of Muenster D-48149 Muenster Germany PNPI Petersburg Nuclear Physics Institute Gatchina Russia Institute for High Energy Physics (IHEP) Protvino Russia RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA Iowa State University Ames Iowa 50011 USA Russian Research Center “Kurchatov Institute ” Moscow Russia St. Petersburg State Technical University St. Petersburg Russia Universidade de São Paulo Instituto de Física Caixa Postal 66318 São Paulo CEP05315-970 Brazil New Mexico State University Las Cruces New Mexico 88003 USA Bhabha Atomic Research Centre Bombay 400 085 India Institute of Physics Academia Sinica Taipei 11529 Taiwan Columbia University New York New York 10027 USA and Nevis Laboratories Irvington New York 10533 USA Institute of Physics University of Tsukuba Tsukuba Ibaraki 305 Japan Korea University Seoul 136-701 Korea Nagasaki Institute of Applied Science Nagasaki-shi Nagasaki 851-0193 Japan Kyoto University Kyoto 606 Japan RIKEN (The Institute of Physical and Chemical Research) Wako Saitama 351-0198 Japan Weizmann Institute Rehovot 76100 Israel Florida State University Tallahassee

Transverse momentum spectra and yields of hadrons are measured by the PHENIX collaboration in Au+Au collisions at sNN=130GeV at the Relativistic Heavy Ion Collider. The time-of-flight resolution allows identification of pions to transverse momenta of 2GeV∕c and protons and antiprotons to 4GeV∕c. The yield of pions rises approximately linearly with the number of nucleons participating in the collision, while the number of kaons, protons, and antiprotons increases more rapidly. The shape of the momentum distribution changes between peripheral and central collisions. Simultaneous analysis of all the pT spectra indicates radial collective expansion, consistent with predictions of hydrodynamic models. Hydrodynamic analysis of the spectra shows that the expansion velocity increases with collision centrality and collision energy. This expansion boosts the particle momenta, causing the yield from soft processes to exceed that for hard to large transverse momentum, perhaps as large as 3GeV∕c.

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Bose-Einstein Correlations of Charged Pion Pairs in Au+Au Collisions at sNN=200 GeV

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Physical Review Letters 2004年第15期93卷 152302-152302页

作者： S. S. Adler S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba J. Alexander R. Amirikas L. Aphecetche S. H. Aronson R. Averbeck T. C. Awes R. Azmoun V. Babintsev A. Baldisseri K. N. Barish P. D. Barnes B. Bassalleck S. Bathe S. Batsouli V. Baublis A. Bazilevsky S. Belikov Y. Berdnikov S. Bhagavatula J. G. Boissevain H. Borel S. Borenstein M. L. Brooks D. S. Brown N. Bruner D. Bucher H. Buesching V. Bumazhnov G. Bunce J. M. Burward-Hoy S. Butsyk X. Camard J.-S. Chai P. Chand W. C. Chang S. Chernichenko C. Y. Chi J. Chiba M. Chiu I. J. Choi J. Choi R. K. Choudhury T. Chujo V. Cianciolo Y. Cobigo B. A. Cole P. Constantin D. G. d'Enterria G. David H. Delagrange A. Denisov A. Deshpande E. J. Desmond O. Dietzsch O. Drapier A. Drees R. du Rietz A. Durum D. Dutta Y. V. Efremenko K. El Chenawi A. Enokizono H. En'yo S. Esumi L. Ewell D. E. Fields F. Fleuret S. L. Fokin B. D. Fox Z. Fraenkel J. E. Frantz A. Franz A. D. Frawley S.-Y. Fung S. Garpman T. K. Ghosh A. Glenn G. Gogiberidze M. Gonin J. Gosset Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp W. Guryn H.-Å. Gustafsson T. Hachiya J. S. Haggerty H. Hamagaki A. G. Hansen E. P. Hartouni M. Harvey R. Hayano X. He M. Heffner T. K. Hemmick J. M. Heuser M. Hibino J. C. Hill W. Holzmann K. Homma B. Hong A. Hoover T. Ichihara V. V. Ikonnikov K. Imai D. Isenhower M. Ishihara M. Issah A. Isupov B. V. Jacak W. Y. Jang Y. Jeong J. Jia O. Jinnouchi B. M. Johnson S. C. Johnson K. S. Joo D. Jouan S. Kametani N. Kamihara J. H. Kang S. S. Kapoor K. Katou S. Kelly B. Khachaturov A. Khanzadeev J. Kikuchi D. H. Kim D. J. Kim D. W. Kim E. Kim G.-B. Kim H. J. Kim E. Kistenev A. Kiyomichi K. Kiyoyama C. Klein-Boesing H. Kobayashi L. Kochenda V. Kochetkov D. Koehler T. Kohama M. Kopytine D. Kotchetkov A. Kozlov P. J. Kroon C. H. Kuberg K. Kurita Y. Kuroki M. J. Kweon Y. Kwon G. S. Kyle R. Lacey V. Ladygin J. G. Lajoie A. Lebedev S. Leckey D. M. Lee S. Lee M. J. Leitch X. H. Li H. Lim A. Litvinenko M. X. Liu Y. Liu C. F. Maguire Y. I. Makdisi A. Malakhov V. I. Manko Y. Ma Brookhaven National Laboratory Upton New York 11973-5000 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA KEK High Energy Accelerator Research Organization Tsukuba-shi Ibaraki-ken 305-0801 Japan RIKEN (The Institute of Physical and Chemical Research) Wako Saitama 351-0198 Japan Florida State University Tallahassee Florida 32306 USA SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) BP 20722 44307 Nantes 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 Institute for High Energy Physics (IHEP) Protvino Russia 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 USA Institut für Kernphysik University of Muenster D-48149 Muenster Germany Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 USA PNPI Petersburg Nuclear Physics Institute Gatchina Russia RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA Iowa State University Ames Iowa 50011 USA St. Petersburg State Technical University St. Petersburg Russia Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France New Mexico State University Las Cruces New Mexico 88003 USA Lawrence Livermore National Laboratory Livermore California 94550 USA KAERI Cyclotron Application Laboratory Seoul South Korea Bhabha Atomic Research Centre Bombay 400 085 India Institute of Physics Academia Sinica Taipei 11529 Taiwan Yonsei University IPAP Seoul 120-749 Korea Kangnung National University Kangnung 210-702 South Korea Universidade de São Paulo Instituto de Física Caixa

Bose-Einstein correlations of identically charged pion pairs were measured by the PHENIX experiment at midrapidity in Au+Au collisions at sNN=200 GeV. The Bertsch-Pratt radius parameters were determined as a function of the transverse momentum of the pair and as a function of the centrality of the collision. Using the standard core-halo partial Coulomb fits, and a new parametrization which constrains the Coulomb fraction as determined from the unlike-sign pion correlation, the ratio Rout/Rside is within 0.8–1.1 for 0.25<〈kT〉<1.2 GeV/c. The centrality dependence of all radii is well described by a linear scaling in Npart1/3, and Rout/Rside for 〈kT〉∼0.45 GeV/c is approximately constant at unity as a function of centrality.

关键词： Charged particles

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J/ψ Production from Proton-Proton Collisions at s=200 GeV

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Physical Review Letters 2004年第5期92卷 051802-051802页

作者： S. S. Adler S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba J. Alexander R. Amirikas L. Aphecetche S. H. Aronson R. Averbeck T. C. Awes R. Azmoun V. Babintsev A. Baldisseri K. N. Barish P. D. Barnes B. Bassalleck S. Bathe S. Batsouli V. Baublis A. Bazilevsky S. Belikov Y. Berdnikov S. Bhagavatula J. G. Boissevain H. Borel S. Borenstein M. L. Brooks D. S. Brown N. Bruner D. Bucher H. Buesching V. Bumazhnov G. Bunce J. M. Burward-Hoy S. Butsyk X. Camard J.-S. Chai P. Chand W. C. Chang S. Chernichenko C. Y. Chi J. Chiba M. Chiu I. J. Choi J. Choi R. K. Choudhury T. Chujo V. Cianciolo Y. Cobigo B. A. Cole P. Constantin D. G. d’Enterria G. David H. Delagrange A. Denisov A. Deshpande E. J. Desmond O. Dietzsch O. Drapier A. Drees K. A. Drees R. du Rietz A. Durum D. Dutta Y. V. Efremenko K. El Chenawi A. Enokizono H. En’yo S. Esumi L. Ewell D. E. Fields F. Fleuret S. L. Fokin B. D. Fox Z. Fraenkel J. E. Frantz A. Franz A. D. Frawley S.-Y. Fung S. Garpman T. K. Ghosh A. Glenn G. Gogiberidze M. Gonin J. Gosset Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp W. Guryn H.-Å. Gustafsson T. Hachiya J. S. Haggerty H. Hamagaki A. G. Hansen E. P. Hartouni M. Harvey R. Hayano X. He M. Heffner T. K. Hemmick J. M. Heuser M. Hibino J. C. Hill W. Holzmann K. Homma B. Hong A. Hoover T. Ichihara V. V. Ikonnikov K. Imai D. Isenhower M. Ishihara M. Issah A. Isupov B. V. Jacak W. Y. Jang Y. Jeong J. Jia O. Jinnouchi B. M. Johnson S. C. Johnson K. S. Joo D. Jouan S. Kametani N. Kamihara J. H. Kang S. S. Kapoor K. Katou S. Kelly B. Khachaturov A. Khanzadeev J. Kikuchi D. H. Kim D. J. Kim D. W. Kim E. Kim G.-B. Kim H. J. Kim E. Kistenev A. Kiyomichi K. Kiyoyama C. Klein-Boesing H. Kobayashi L. Kochenda V. Kochetkov D. Koehler T. Kohama M. Kopytine D. Kotchetkov A. Kozlov P. J. Kroon C. H. Kuberg K. Kurita Y. Kuroki M. J. Kweon Y. Kwon G. S. Kyle R. Lacey V. Ladygin J. G. Lajoie A. Lebedev S. Leckey D. M. Lee S. Lee M. J. Leitch X. H. Li H. Lim A. Litvinenko M. X. Liu Y. Liu C. F. Maguire Y. I. Makdisi A. Malakhov V. I. Brookhaven National Laboratory Upton New York 11973-5000 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA KEK High Energy Accelerator Research Organization Tsukuba-shi Ibaraki-ken 305-0801 Japan RIKEN (The Institute of Physical and Chemical Research) Wako Saitama 351-0198 Japan Florida State University Tallahassee Florida 32306 USA SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) BP 20722-44307 Nantes 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 Institute for High Energy Physics (IHEP) Protvino Russia 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 Institut fuer Kernphysik University of Muenster D-48149 Muenster Germany Columbia University New York New York 10027 USA and Nevis Laboratories Irvington New York 10533 USA PNPI Petersburg Nuclear Physics Institute Gatchina Russia RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA Iowa State University Ames Iowa 50011 USA St. Petersburg State Technical University St. Petersburg Russia Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France New Mexico State University Las Cruces New Mexico 88003 USA Lawrence Livermore National Laboratory Livermore California 94550 USA KAERI Cyclotron Application Laboratory Seoul South Korea Bhabha Atomic Research Centre Bombay 400 085 India Institute of Physics Academia Sinica Taipei 11529 Taiwan Yonsei University IPAP Seoul 120-749 Korea Kangnung National University Kangnung 210-702 South Korea Universidade de São Paulo Instituto de F

J/ψ production has been measured in proton-proton collisions at s=200 GeV over a wide rapidity and transverse momentum range by the PHENIX experiment at the Relativistic Heavy Ion Collider. Distributions of the rapidity and transverse momentum, along with measurements of the mean transverse momentum and total production cross section are presented and compared to available theoretical calculations. The total J/ψ cross section is 4.0±0.6(stat)±0.6(syst)±0.4(abs) μb. The mean transverse momentum is 1.80±0.23(stat)±0.16(syst) GeV/c.

关键词： Protons

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