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Systematic studies of the centrality and sNN dependence of the dET/dη and dNch/dη in heavy ion collisions at midrapidity

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Physical Review C 2005年第3期71卷 034908-034908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 SUNY at Stony Brook Stony Brook New York 11794-3400 USA KEK High Energy Accelerator Research Organization Tsukuba-shi Ibaraki-ken 305-0801 Japan Institute of Physical and Chemical Research (RIKEN) Wako Saitama 351-0198 Japan Florida State University Tallahassee Florida 32306 USA SUBATECH Ecole des Mines de Nantes Centre National de la Recherche Scientifique-IN2P3 Université de Nantes BP 20722-44307 Nantes France Department of Physics and Astronomy SUNY at Stony Brook Stony Brook New York 11794 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Institute for High Energy Physics (IHEP) Protvino Russia Dapnia Commissariat à l'Energie Atomique 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 für Kernphysik University of Muenster D-48149 Muenster Germany Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 USA Petersburg Nuclear Physics Institute (PNPI) 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 Centre National de la Recherche Scientifique 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 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

The PHENIX experiment at the relativistic heavy ion collider (RHIC) has measured transverse energy and charged particle multiplicity at midrapidity in Au+Au collisions at center-of-mass energies sNN=19.6,130, and 200GeV as a function of centrality. The presented results are compared to measurements from other RHIC experiments and experiments at lower energies. The sNN dependence of dET/dη and dNch/dη per pair of participants is consistent with logarithmic scaling for the most central events. The centrality dependence of dET/dη and dNch/dη is similar at all measured incident energies. At RHIC energies, the ratio of transverse energy per charged particle was found to be independent of centrality and growing slowly with sNN. A survey of comparisons between the data and available theoretical models is also presented.

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The belle L1.5 trigger

The belle L1.5 trigger

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2004 nuclear science Symposium, Medical Imaging Conference, Symposium on nuclear Power Systems and the 14th International Workshop on Room Temperature Semiconductor X- and Gamma- Ray Detectors

作者： Stamen, R. Ziegler, T. Aihara, H. Asano, Y. Aso, T. Bakich, A. Barbero, M. Browder, T. Chang, M.C. Chao, Y. Chen, K.F. Chidzik, S. Chouvikov, A. Dalseno, J. Dowd, R. Fernholz, R. Fratina, S. Friedl, M. Fujii, H. Fujiyama, Y. Haba, J. Hara, K. Hara, T. Harrop, B. Haruyama, T. Hayashi, K. Hazumi, M. Heffernan, D. Higuchi, T. Igarashi, A. Igarashi, Y. Ikeda, H. Ishino, H. Iwaida, S. Kameshima, T. Kapusta, P. Kasami, K. Kawasaki, T. Kibayashi, A. Koike, S. Korpar, S. Križan, P. Kurashiro, H. Kusaka, A. Lesiak, T. Marlow, D. Matsumoto, H. Mikami, Y. Miyake, H. Moloney, G.R. Natkaniec, Z. Nozaki, S. Ohkubo, R. Okuno, S. Ono, S. Onuki, Y. Ostrowicz, W. Ozaki, H. Peak, L. Pernicka, M. Rosen, M. Rozanska, M. Sato, N. Schmid, S. Schümann, J. Shibata, T. Stanič, S. Steininger, H. Sumisawa, K. Suzuki, J. Tajima, H. Tajima, O. Takahashi, K. Takasaki, F. Tamura, N. Tanaka, M. Taylor, G.N. Trahelsi, K. Tsuhoyama, T. Uchida, K. Ueno, K. Ueno, K. Ushiroda, Y. Vahsen, S. Varner, G. Varvell, K. Velikzhanin, Y.S. Wang, C.C. Wang, M.Z. Watanabe, M. Watanahe, Y. Yamamoto, H. Yamashita, Y. Yamauchi, M. Yang, R. Yasu, Y. Zontar, D. Lawrence Berkeley National Laboratory Mail Stop 6222 1 Cyclotron Road Berkeley CA 94720 United States University of Hawaii Department of Physics and Astronomy 2505 Correa Road Honolulu HI 96822 United States Kanagawa University Faculty of Engineering 3-27-1 Rokkakubashi Yokohama Kanagawa 221-8686 Japan Niewodniczanski Institute of Nuclear Physics Polish Academy ot Sciences ul. Radzikowskiego 152 31-342 Krakow Poland Jožcf Stefan Institute Jamova 39 SI-1000 Ljubljana Slovenia University of Melbourne School of Physics Vic. 3010 Australia Nihon Dental College 1-8 Hamaura-cho Niigata 951-8151 Japan Niigata Graduate School of Science and Technology Niigata University Niigata 950-2181 Japan Osaka University Department of Physics Graduate School of Science 1-1 Machikaneyama Toyonaka Osaka 560-0043 Japan Princeton University Department of Physics PO Box 708 Princeton NJ 08544 United States University of Sydney School of Physics NSW 2006 Australia National Taiwan University Department of Physics HEP Lab. Taipei 10764 Taiwan Tohoku University Department of Physics HEP Group AramakiAoba-ku Sendai 980-8578 Japan Tokyo Institute of Technology Department of Physics Group HP 2-12-1Oh-okayama Megro-ku Tokyo 152-8551 Japan University of Tokyo Department of Physics 7-3-1 Hongo Bunkyo-kuTokyo 113-0033 Japan Toyama National College of Maritime Technology Toyama Japan KEK High Energy Accelerator Research Organization 1-1 Oho Tsukuba-shi Ibarakiken 305-080 Japan University of Tsukuba Institute of Applied Physics 1-1-1 Tenodai Tsukuba-shi Ibarakiken 305-8573 Japan IHEP Vienna Nikolsdorfergasse 18 Vienna A1050 Austria

During the summer shutdown of 2003 the new silicon vertex detector SVD2 was installed in Belle at the KEK-B factory in Tsukuha. Japan and started to take data in October 2003. It provides important improvements in the tracking capabilities and adds new trigger functionality. In addition a new hardware trigger Level 1.5 was designed and installed that takes advantage of the digitized SVD hit data. The improvement in the Belle trigger system is important to deal with the increasing luminosity and higher beam currents of the KEK-B collider. The design of the Level 1.5 trigger system is reviewed and results from the data taking are presented. © 2004 IEEE.

关键词： Particle detectors

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The improved ladder production for the belle silicon vertex detector (SVD2.1)

The improved ladder production for the belle silicon vertex ...

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2004 nuclear science Symposium, Medical Imaging Conference, Symposium on nuclear Power Systems and the 14th International Workshop on Room Temperature Semiconductor X- and Gamma- Ray Detectors

作者： Ziegler, T. Aihara, H. Asano, Y. Aso, T. Bakich, A. Barbero, M. Browder, T. Chang, M.C. Chao, Y. Chen, K.F. Chidzik, S. Chouvikov, A. Dalseno, J. Dowd, R. Femholz, R. Fratina, S. Friedl, M. Fujii, H. Fujiyama, Y. Haba, J. Hara, K. Hara, T. Harrop, B. Haruyama, T. Hayashi, K. Hazumi, M. Heffernan, D. Higuchi, T. Igarashi, A. Igarashi, Y. Ikeda, H. Ishino, H. Iwaida, S. Kameshima, T. Kapusta, P. Kasami, K. Kawasaki, T. Kibayashi, A. Koike, S. Korpar, S. Križan, P. Kurashiro, H. Kusaka, A. Lesiak, T. Marlow, D. Matsumoto, H. Mikami, Y. Miyake, H. Moloney, G.R. Natkaniec, Z. Nozaki, S. Ohkubo, R. Okuno, S. Ono, S. Onuki, Y. Ostrowicz, W. Ozaki, H. Peak, L. Pernicka, M. Rosen, M. Rozanska, M. Sato, N. Schmid, S. Schümann, J. Shibata, T. Stamen, R. Stanič, S. Steininger, H. Sumisawa, K. Suzuki, J. Tajima, H. Tajima, O. Takahashi, K. Takasaki, F. Tamura, N. Tanaka, M. Taylor, G.N. Trabelsi, K. Tsuboyama, T. Uchida, K. Ueno, K. Ueno, K. Ushiroda, Y. Vahsen, S. Varner, G. Varvell, K. Velikzhanin, Y.S. Wang, C.C. Wang, M.Z. Watanabe, M. Watanabe, Y. Yamamoto, H. Yamashita, Y. Yamauchi, M. Yang, R. Yasu, Y. Zontar, D. Lawrence Berkeley National Laboratory Mail Stop 6222 1 Cyclotron Road Berkeley CA 94720 United States University of Hawaii Department of Physics and Astronomy 2505 Correa Road Honolulu HI 96822 United States Kanagawa University Faculty of Engineering 3-27-1 Rokkakubashi Yokohama Kanagawa 221-8686 Japan H. Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences ul. Radzikowskiego 152 31-342 Krakow Poland Jožef Stefan Institute Jamova 39 SI-1000 Ljubljana Slovenia University of Melbourne School of Physics Vic. 3010 Australia Nihon Dental College 1-8 Hamaura-cho Niigata 951-8151 Japan Niigata Graduate School of Science and Technology Niigata University Niigata 950-2181 Japan Osaka University Department of Physics Graduate School of Science 1-1 Machikaneyama Toyonaka Osaka 560-0043 Japan Princeton University Department of Physics PO Box 708 Princeton NJ 08544 United States University of Sydney School of Physics NSW 2006 Australia National Taiwan University Department of Physics HEP Lab. Taipei 10764 Taiwan Tohoku University Department of Physics HEP Group AramakiAoba-ku Sendai 980-8578 Japan Tokyo Institute of Technology Department of Physics Group HP 2-12-1Oh-okayama Megro-ku Tokyo 152-8551 Japan University of Tokyo Department of Physics 7-3-1 Hongo Bunkyo-kuTokyo 113-0033 Japan Toyama National College of Maritime Technology Toyama Japan KEK High Energy Accelerator Research Organization 1-1 Oho Tsukuba-shiIbaraki-ken 305-080 Japan University of Tsukuba Institute of Applied Physics 1-1-1 Tenodai Tsukuba-shi Ibaraki-ken 305-8573 Japan IHEP Vienna Nikolsdorfergasse 18 Vienna A1050 Austria

In autumn 2003 data taking with the new Silicon Vertex Detector SVD2 in Belle started at the KEK-B energy-asymmetric e+ e- collider in Tsukuba, Japan. The detector works as expected, however, it was decided to produce replacement ladders for the inner two layers of the vertex detector which are most exposed to the high radiation doses from the beam. The new ladders are not merely reproducing the existing design but include some significant improvements. The readout electronics is designed in a FR4 hybrid board with a new heat transfer scheme in order to dissipate the heat produced in the VA1TA front-end readout chips. The flex circuits that connect the double-sided silicon sensors (DSSD's) with the hybrid boards were redesigned using a 2-layer technique which improved the production quality and lowered their costs significantly. Production and testing will he finished by the end of 2004 and will provide Belle with spare ladders as well as new expertise for possible future projects like e.g. developments for a high luminosity B-factory. © 2004 IEEE.

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Level-1 silicon vertex detector trigger at Belle

Level-1 silicon vertex detector trigger at Belle

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2004 nuclear science Symposium, Medical Imaging Conference, Symposium on nuclear Power Systems and the 14th International Workshop on Room Temperature Semiconductor X- and Gamma- Ray Detectors

作者： Kurashiro, H. Aihara, H. Asano, Y. Aso, T. Bakich, A. Barbero, M. Browder, T. Chang, M.C. Chao, Y. Chen, K.F. Chidzik, S. Chouvikov, A. Dalseno, J. Dowd, R. Fernholz, R. Fratina, S. Friedl, M. Fujii, H. Fujiyama, Y. Haba, J. Hara, K. Hara, T. Harrop, B. Haruyama, T. Hayashi, K. Hazumi, M. Heffernan, D. Higuchi, T. Igarashi, A. Igarashi, Y. Ikeda, H. Ishino, H. Iwaida, S. Kameshima, T. Kaneko, J. Kapusta, P. Kasami, K. Kawasaki, T. Kibayashi, A. Koike, S. Korpar, S. Križan, P. Kusaka, A. Lesiak, T. Marlow, D. Matsumoto, H. Mikami, Y. Miyake, H. Moloney, G.R. Nakadaira, T. Natkaniec, Z. Nozaki, S. Ohkubo, R. Ohno, F. Okuno, S. Ono, S. Onuki, Y. Ostrowicz, W. Ozaki, H. Peak, L. Pernicka, M. Rosen, M. Rozanska, M. Sato, N. Schmid, S. Schümann, J. Shibata, T. Stamen, R. Stanič, S. Steininger, H. Sumisawa, K. Suzuki, J. Tajima, H. Tajima, O. Takahashi, K. Takasaki, F. Tamura, N. Tanaka, M. Taylor, G.N. Trabelsi, K. Tsuboyama, T. Uchida, K. Ueno, K. Ueno, K. Ushiroda, Y. Vahsen, S. Varner, G. Varvell, K. Velikzhanin, Y.S. Wang, C.C. Wang, M.Z. Watanabe, M. Watanabe, Y. Yamamoto, H. Yamashita, Y. Yamauchi, M. Yang, R. Yasu, Y. Zontar, D. Lawrence Berkeley National Laboratory Mail Stop 6222 1 Cyclotron Road Berkeley CA 94720 United States University of Hawaii Department of Physics and Astronomy 2505 Correa Road Honolulu HI 96822 United States Kanagawa University Faculty of Engineering 3-27-1 Rokkakubashi Yokohama Kanagawa 221-8686 Japan H. Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences ul. Radzikowskiego 152 31-342 Krakow Poland Jožef Stefan Institute Jamova 39 SI-1000 Ljubljana Slovenia University of Melbourne School of Physics Vic. 3010 Australia Nihon Dental College 1-8 Hamaura-cho Niigata 951-8151 Japan Niigata Graduate School of Science and Technology Niigata University Niigata 950-2181 Japan Osaka University Department of Physics Graduate School of Science 1-1 Machikaneyama Toyonaka Osaka 560-0043 Japan Princeton University Department of Physics PO Box 708 Princeton NJ 08544 United States University of Sydney School of Physics NSW 2006 Australia National Taiwan University Department of Physics HEP Lab. Taipei 10764 Taiwan Tohoku University Department of Physics HEP Group Aramaki Aoba-ku Sendai 980-8578 Japan Tokyo Institute of Technology Department of Physics Group HP 2-12-1 Oh-okayama Megro-ku Tokyo 152-8551 Japan University of Tokyo Department of Physics 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan Toyama National College of Maritime Technology Toyama Japan KEK High Energy Accelerator Research Organization 1-1 Oho Tsukuba-shi Ibaraki-ken 305-080 Japan University of Tsukuba Institute of Applied Physics 1-1-1 Tenodai Tsukubashi Ibaraki-ken 305-8573 Japan IHEP Vienna Nikolsdorfergasse 18 Vienna A1050 Australia

We present a newly developed fast trigger system that uses the silicon vertex detector (SVD) for the Belle experiment at the KEKB energy-asymmetric e+e- collider. It is designed to issue the trigger with a latency of 1.85 μs for the Belle central trigger system (GDL). The primary purpose of the SVD trigger is to reduce beam-induced background events by requiring tracks that come from the interaction point. The system receives trigger signals from VA1TA front-end integrated circuits, which read out signals on the silicon-strips. SVD tracks are constructed with them in combination with the trigger information of the Central Drift Chamber (CDC), which is located outside the SVD. Performance of the SVD trigger is evaluated with collision data. © 2004 IEEE.

关键词： Colliding beam accelerators

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The Belle L1.5 trigger

The Belle L1.5 trigger

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IEEE Symposium on nuclear science (NSS/MIC)

作者： R. Stamen T. Ziegler H. Aihara Y. Asano T. Aso A. Bakich M. Barbero T. Browder M.C. Chang Y. Chao K.F. Chen S. Chidzik A. Chouvikov J. Dalseno R. Dowd R. Fernholz S. Fratina M. Friedl H. Fujii Y. Fujiyama J. Haba K. Hara T. Hara B. Harrop T. Haruyama K. Hayashi M. Hazumi D. Heffernan T. Higuchi A. Igarashi Y. Igarashi H. Ikeda H. Ishino S. Iwaida T. Kameshima P. Kapusta K. Kasami T. Kawasaki A. Kibayashi S. Koike S. Korpar P. Krizan H. Kurashiro A. Kusaka T. Lesiak D. Marlow H. Matsumoto Y. Mikami H. Miyake G.R. Moloney Z. Natkaniec S. Nozaki R. Ohkubo S. Okuno S. Ono Y. Onuki W. Ostrowicz H. Ozaki L. Peak M. Pernicka M. Rosen M. Rozanska N. Sato S. Schmid J. Schumann T. Shibata S. Stanic H. Steininger K. Sumisawa J. Suzuki H. Tajima O. Tajima K. Takahashi F. Takasaki N. Tamura M. Tanaka G.N. Taylor K. Trabelsi T. Tsuboyama K. Uchida K. Ueno Y. Ushiroda S. Vahsen G. Varner K. Varvell Y.S. Velikzhanin C.C. Wang M.Z. Wang M. Watanabe Y. Watanabe H. Yamamoto Y. Yamashita M. Yamauchi R. Yang Y. Yasu D. Zontar KEK High Energy Accelerator research Organization Lbaraki-ken Japan The Belle SVD Group Department of Physics Princeton University Princeton NJ USA Department of Physics University of Tokyo Bunkyo Tokyo Japan Department of Physics Group HP Tokyo Institute of Technology Tokyo Japan Institute of Applied Physics University of Tsukuba Tsukuba Ibaraki Japan Toyama National College of Maritime Technology Toyama Japan University of Sydney School of Physics NSW Australia Department of Physics and Astronomy University of Hawaii Honolulu HI USA Department of Physics HEP Lab National Taiwan University Taiwan Taiwan University of Melbourne The School of Physics Victoria Australia Jožef Stefan Institute Ljubljana Slovenia The Belle SVD Group Vienna Austria Department of Physics Graduate School of Science Osaka University Toyonaka Osaka Japan University of Tsukuba Institute of Applied Physics Ibaraki-ken Japan Institute of Nuclear Physics Polish Academy of Sciences ul Krakow Poland Niigata Graduate School of Science and Technology Niigata university Niigata Japan Department of Physics University of Tokyo Tokyo Japan Department of Physics HEP Group Aramaki Aoba-ku Tohoku University Sendai Japan Faculty of Engineering Kanagawa University Kanagawa Japan Lawrence Berkeley National Laboratory Berkeley CA USA School of Physics University of Sydney NSW Australia National Taiwan University Department ofPhysics HEP Lab Taipei 10764Taiwan R.O.C.. Department of Physics HEP Group Tohoku University Aoba-ku Sendai Japan Nihon Dental College Niigata Japan High Energy Accelerator research Organization KEK Tsukuba Ibaraki Japan

During the summer shutdown of 2003 the new silicon vertex detector SVD2 was installed in Belle at the KEK-B factory in Tsukuba, Japan and started to take data in October 2003. It provides important improvements in the tracking capabilities and adds new trigger functionality. In addition a new hardware trigger level 1.5 was designed and installed that takes advantage of the digitized SVD hit data. The improvement in the Belle trigger system is important to deal with the increasing luminosity and higher beam currents of the KEK-B collider. The design of the level 1.5 trigger system is reviewed and results from the data taking are presented.

关键词： Chaos Australia Silicon Laboratories Cyclotrons Postal services nuclear physics Dentistry Educational institutions Detectors

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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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Measurement of Nonrandom Event-by-Event Fluctuations of Average Transverse Momentum in sNN=200 GeV Au+Au and p+p Collisions

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Physical Review Letters 2004年第9期93卷 092301-092301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 Cai

Event-by-event fluctuations of the average transverse momentum of produced particles near midrapidity have been measured by the PHENIX Collaboration in sNN=200 GeV Au+Au, and p+p collisions at the Relativistic Heavy Ion Collider. The fluctuations are observed to be in excess of the expectation for statistically independent particle emission for all centralities. The excess fluctuations exhibit a dependence on both the centrality of the collision and on the pT range over which the average is calculated. Both the centrality and pT dependence can be well reproduced by a simulation of random particle production with the addition of contributions from hard-scattering processes.

关键词： Gold

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Double Helicity Asymmetry in Inclusive Midrapidity π0 Production for Polarized p+p Collisions at s=200 GeV

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Physical Review Letters 2004年第20期93卷 202002-202002页

作者： S. S. Adler S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba A. Al-Jamel J. Alexander K. Aoki L. Aphecetche R. Armendariz S. H. Aronson R. Averbeck T. C. Awes V. Babintsev A. Baldisseri K. N. Barish P. D. Barnes B. Bassalleck S. Bathe S. Batsouli V. Baublis F. Bauer A. Bazilevsky S. Belikov M. T. Bjorndal J. G. Boissevain H. Borel M. L. Brooks D. S. Brown N. Bruner D. Bucher H. Buesching V. Bumazhnov G. Bunce J. M. Burward-Hoy S. Butsyk X. Camard P. Chand W. C. Chang S. Chernichenko C. Y. Chi J. Chiba M. Chiu I. J. Choi R. K. Choudhury T. Chujo V. Cianciolo Y. Cobigo B. A. Cole M. P. Comets P. Constantin M. Csanád T. Csörgő J. P. Cussonneau D. d'Enterria K. Das G. David F. Deák H. Delagrange A. Denisov A. Deshpande E. J. Desmond A. Devismes O. Dietzsch J. L. Drachenberg O. Drapier A. Drees A. Durum D. Dutta V. Dzhordzhadze Y. V. Efremenko H. En'yo B. Espagnon S. Esumi D. E. Fields C. Finck F. Fleuret S. L. Fokin B. D. Fox Z. Fraenkel J. E. Frantz A. Franz A. D. Frawley Y. Fukao S.-Y. Fung S. Gadrat M. Germain A. Glenn M. Gonin J. Gosset Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp H.-Å. Gustafsson T. Hachiya J. S. Haggerty H. Hamagaki A. G. Hansen E. P. Hartouni M. Harvey K. Hasuko R. Hayano X. He M. Heffner T. K. Hemmick J. M. Heuser P. Hidas H. Hiejima J. C. Hill R. Hobbs W. Holzmann K. Homma B. Hong A. Hoover T. Horaguchi T. Ichihara V. V. Ikonnikov K. Imai M. Inaba M. Inuzuka D. Isenhower L. Isenhower M. Ishihara M. Issah A. Isupov B. V. Jacak J. Jia O. Jinnouchi B. M. Johnson S. C. Johnson K. S. Joo D. Jouan F. Kajihara S. Kametani N. Kamihara M. Kaneta J. H. Kang K. Katou T. Kawabata A. Kazantsev S. Kelly B. Khachaturov A. Khanzadeev J. Kikuchi D. J. Kim E. Kim G.-B. Kim H. J. Kim E. Kinney A. Kiss E. Kistenev A. Kiyomichi C. Klein-Boesing H. Kobayashi V. Kochetkov R. Kohara B. Komkov M. Konno D. Kotchetkov A. Kozlov P. J. Kroon C. H. Kuberg G. J. Kunde K. Kurita M. J. Kweon Y. Kwon G. S. Kyle R. Lacey J. G. Lajoie Y. Le Bornec A. Lebedev S. Leckey D. M. Lee M. J. Leitch M. A. L. Brookhaven National Laboratory Upton New York 11973-5000 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Columbia University New York New York 10027 USA and Nevis Laboratories Irvington New York 10533 USA 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 New Mexico State University Las Cruces New Mexico 88003 USA Kyoto University Kyoto 606-8394 Japan 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 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 Lawrence Livermore National Laboratory Livermore California 94550 USA Bhabha Atomic Research Centre Bombay 400 085 India Institute of Physics Academia Sinica Taipei 11529 Taiwan Yonsei University IPAP Seoul 120-749 Korea IPN-Orsay Universite Paris Sud CNRS-IN2P3 BP1 F-91406 Orsay France ELTE Eötvös Loránd University H-1117 Budapest Pázmány P. s. 1/A Hungary KFKI Research Institute for Particle and Nuclear Physics (RMKI) H-1525 Budapest 114 POBox 49 Hungary Florida State University Tallahassee Florida 32306 USA Universidade de São Paulo Instituto de F

We present a measurement of the double longitudinal spin asymmetry in inclusive π0 production in polarized proton-proton collisions at s=200 GeV. The data were taken at the Relativistic Heavy Ion Collider with average beam polarizations of 0.27. The measurements are the first in a program to study the longitudinal spin structure of the proton, using strongly interacting probes, at collider energies. The asymmetry is presented for transverse momenta 1–5 GeV/c at midrapidity, where next-to-leading-order perturbative quantum chromodynamic (NLO pQCD) calculations well describe the unpolarized cross section. The observed asymmetry is small and is compared to a NLO pQCD calculation with a range of polarized gluon distributions.

关键词： Polarization

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