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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.

关键词： Particle detectors

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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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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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IEEE Symposium on nuclear Science (NSS/MIC)

作者： 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 R. Stamen 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 Department of Physics Princeton University Princeton NJ USA Department of Physics University of Tokyo Bunkyo-ku Tokyo Japan Institute of Applied Physics University of Tsukuba Tsukuba-shi Ibarakiken Japan Toyama National College of Maritime Technology Toyama Japan School of Physics University of Sydney NSW Australia Department of Physics and Astronomy University of Hawaii Honolulu HI USA Department of Physics HEP Lab National Taiwan University Taipei Taiwan R.O.C. The School of Physics University of Melbourne Victoria Australia Stefan Institute Ljubljana Slovenia IHEP Vienna Vienna Austria KEK High Energy Accelerator research Organization Tsukuba-shi Ibarakiken Japan Department of Physics Group HP Tokyo Institute of Technology Megro-ku Tokyo Japan Department of Physics Graduate Osaka University Toyonaka Osaka Japan Lawrence Berkeley National Laboratory Berkeley CA USA High Energy Accelerator research Organization KEK Tsukuba Ibaraki Japan Polish Academy of Sciences Institute of Nuclear Physics Krakow Poland Niigata Graduate Niigata university Niigata Japan Department of Physics HEP Group Aramaki Tohoku University Aoba-ku Sendai Japan Faculty of Engineering Kanagawa University Yokohama Kanagawa Japan School of Physics University of Sydney Australia Department of Physics HEP Lab National Taiwan University Taiwan Taiwan Department of Physics HEP Group Tohoku University Aoba-ku Sendai Japan Nihon Dental College Niigata Japan Jožef Stefan Institute Ljubljana Slovenia

In autumn 2003 data taking with the new silicon vertex detector SVD2 in Belle started at the KEK-B energy-asymmetric e/sup +/e/sup -/ 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 be 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.

关键词： Production Silicon Chaos Australia Radiation detectors Laboratories Cyclotrons Postal services nuclear physics Dentistry

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Multistrange Baryon Production in Au-Au Collisions at sNN=130 GeV

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Physical Review Letters 2004年第18期92卷 182301-182301页

作者： J. Adams C. Adler M. M. Aggarwal Z. Ahammed J. Amonett B. D. Anderson D. Arkhipkin G. S. Averichev Y. Bai J. Balewski O. Barannikova L. S. Barnby J. Baudot S. Bekele V. V. Belaga R. Bellwied J. Berger B. I. Bezverkhny S. Bharadwaj V. S. Bhatia H. Bichsel L. C. Bland C. O. Blyth B. E. Bonner M. Botje A. Boucham A. Brandin A. Bravar R. V. Cadman X. Z. Cai H. Caines M. Calderón de la Barca Sánchez J. Carroll J. Castillo D. Cebra P. Chaloupka S. Chattopdhyay H. F. Chen Y. Chen J. Cheng M. Cherney A. Chikanian W. Christie J. P. Coffin T. M. Cormier J. G. Cramer H. J. Crawford D. Das S. Das M. M. de Moura A. A. Derevschikov L. Didenko T. Dietel W. J. Dong X. Dong J. E. Draper F. Du A. K. Dubey V. B. Dunin J. C. Dunlop M. R. Dutta Mazumdar V. Eckardt L. G. Efimov V. Emelianov J. Engelage G. Eppley B. Erazmus M. Estienne P. Fachini J. Faivre R. Fatemi J. Fedorisin K. Filimonov P. Filip E. Finch V. Fine Y. Fisyak D. Flierl K. J. Foley K. Fomenko J. Fu C. A. Gagliardi J. Gans M. S. Ganti L. Gaudichet F. Geurts V. Ghazikhanian P. Ghosh J. E. Gonzalez O. Grachov O. Grebenyuk S. Gronstal D. Grosnick S. M. Guertin A. Gupta T. D. Gutierrez T. J. Hallman A. Hamed D. Hardtke J. W. Harris M. Heinz T. W. Henry S. Hepplemann B. Hippolyte A. Hirsch E. Hjort G. W. Hoffmann H. Z. Huang S. L. Huang E. Hughes T. J. Humanic G. Igo A. Ishihara P. Jacobs W. W. Jacobs M. Janik H. Jiang P. G. Jones E. G. Judd S. Kabana K. Kang M. Kaplan D. Keane V. Yu. Khodyrev J. Kiryluk A. Kisiel E. M. Kislov J. Klay S. R. Klein A. Klyachko D. D. Koetke T. Kollegger M. Kopytine L. Kotchenda M. Kramer P. Kravtsov V. I. Kravtsov K. Krueger C. Kuhn A. I. Kulikov A. Kumar C. L. Kunz R. Kh. Kutuev A. A. Kuznetsov M. A. C. Lamont J. M. Landgraf S. Lange C. L. Lansdell F. Laue J. Lauret A. Lebedev R. Lednicky S. Lehocka M. J. LeVine C. Li Q. Li Y. LI S. J. Lindenbaum M. A. Lisa F. Liu L. Liu Q. J. Liu Z. Liu T. Ljubicic W. J. Llope H. Long R. S. Longacre M. Lopez-Noriega W. A. Love T. Ludlam D. Lynn G. L. Ma J. G. Ma Y. G. Ma D. Magestro S. Mahajan D. P. Mahapatra University of Birmingham Birmingham United Kingdom University of Frankfurt Frankfurt Germany 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 Amsterdam The Netherlands Indiana University Bloomington Indiana 47408 USA Purdue University West Lafayette Indiana 47907 USA Institut de Recherches Subatomiques Strasbourg France The Ohio State University Columbus Ohio 43210 USA Wayne State University Detroit Michigan 48201 USA Yale University New Haven Connecticut 06520 USA University of Rajasthan Jaipur 302004 India University of Washington Seattle Washington 98195 USA Brookhaven National Laboratory Upton New York 11973 USA Rice University Houston Texas 77251 USA SUBATECH Nantes France Moscow Engineering Physics Institute Moscow Russia Argonne National Laboratory Argonne Illinois 60439 USA Shanghai Institute of Applied Physics Shanghai 201800 People’s Republic of China Lawrence Berkeley National Laboratory Berkeley California 94720 USA University of California Davis California 95616 USA Nuclear Physics Institute AS CR Řež/Prague Czech Republic University of Science & Technology of China Anhui 230027 China University of California Los Angeles California 90095 USA Tsinghua University Beijing People’s Republic of China Creighton University Omaha Nebraska 68178 USA University of California Berkeley California 94720 USA Universidade de Sao Paulo Sao Paulo Brazil Institute of High Energy Physics Protvino Russia Insitute of Physics Bhubaneswar 751005 India Max-Planck-Institut für Physik Munich Germany Texas A&M College Station Texas 77843 USA Valparaiso University Valparaiso Indiana 46383 USA University of Jammu Jammu 180001 India Pennsylvania State University University Park Pennsylvania 16802 USA University of Texas Austin Texas 78712 USA Cali

The transverse mass spectra and midrapidity yields for Ξs and Ωs are presented. For the 10% most central collisions, the Ξ¯+/h− ratio increases from the Super Proton Synchrotron to the Relativistic Heavy Ion Collider energies while the Ξ−/h− stays approximately constant. A hydrodynamically inspired model fit to the Ξ spectra, which assumes a thermalized source, seems to indicate that these multistrange particles experience a significant transverse flow effect, but are emitted when the system is hotter and the flow is smaller than values obtained from a combined fit to π, K, p, and Λs.

关键词： High energy physics

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Centrality and pseudorapidity dependence of charged hadron production at intermediate pT in Au+Au collisions at sNN=130GeV

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Physical Review C 2004年第4期70卷 044901-044901页

作者： J. Adams M. M. Aggarwal Z. Ahammed J. Amonett B. D. Anderson D. Arkhipkin G. S. Averichev Y. Bai J. Balewski O. Barannikova L. S. Barnby J. Baudot S. Bekele V. V. Belaga R. Bellwied J. Berger B. I. Bezverkhny S. Bharadwaj V. S. Bhatia H. Bichsel A. Billmeier L. C. Bland C. O. Blyth B. E. Bonner M. Botje A. Boucham A. Brandin A. Bravar M. Bystersky R. V. Cadman X. Z. Cai H. Caines M. Calderón de la Barca Sánchez J. Carroll J. Castillo D. Cebra P. Chaloupka S. Chattopdhyay H. F. Chen Y. Chen J. Cheng M. Cherney A. Chikanian W. Christie J. P. Coffin T. M. Cormier J. G. Cramer H. J. Crawford D. Das S. Das M. M. de Moura A. A. Derevschikov L. Didenko T. Dietel W. J. Dong X. Dong J. E. Draper F. Du A. K. Dubey V. B. Dunin J. C. Dunlop M. R. Dutta Mazumdar V. Eckardt W. R. Edwards L. G. Efimov V. Emelianov J. Engelage G. Eppley B. Erazmus M. Estienne P. Fachini J. Faivre R. Fatemi J. Fedorisin K. Filimonov P. Filip E. Finch V. Fine Y. Fisyak K. J. Foley K. Fomenko J. Fu C. A. Gagliardi J. Gans M. S. Ganti L. Gaudichet F. Geurts V. Ghazikhanian P. Ghosh J. E. Gonzalez O. Grachov O. Grebenyuk D. Grosnick S. M. Guertin A. Gupta T. D. Gutierrez T. J. Hallman A. Hamed D. Hardtke J. W. Harris M. Heinz T. W. Henry S. Hepplemann B. Hippolyte A. Hirsch E. Hjort G. W. Hoffmann H. Z. Huang S. L. Huang E. W. Hughes T. J. Humanic G. Igo A. Ishihara P. Jacobs W. W. Jacobs M. Janik H. Jiang P. G. Jones E. G. Judd S. Kabana K. Kang M. Kaplan D. Keane V. Yu. Khodyrev J. Kiryluk A. Kisiel E. M. Kislov J. Klay S. R. Klein A. Klyachko D. D. Koetke T. Kollegger M. Kopytine L. Kotchenda M. Kramer P. Kravtsov V. I. Kravtsov K. Krueger C. Kuhn A. I. Kulikov A. Kumar C. L. Kunz R. Kh. Kutuev A. A. Kuznetsov M. A. C. Lamont J. M. Landgraf S. Lange F. Laue J. Lauret A. Lebedev R. Lednicky S. Lehocka M. J. LeVine C. Li Q. Li Y. Li S. J. Lindenbaum M. A. Lisa F. Liu L. Liu Q. J. Liu Z. Liu T. Ljubicic W. J. Llope H. Long R. S. Longacre M. Lopez-Noriega W. A. Love Y. Lu T. Ludlam D. Lynn G. L. Ma J. G. Ma Y. G. Ma D. Magestro S. Mahajan D. P. Mahapa University of Birmingham Birmingham United Kingdom Panjab University Chandigarh 160014 India Variable Energy Cyclotron Centre Kolkata 700064 India Kent State University Kent Ohio 44242 USA Particle Physics Laboratory (JINR) Dubna Russia Laboratory for High Energy (JINR) Dubna Russia NIKHEF Amsterdam The Netherlands Indiana University Bloomington Indiana 47408 USA Purdue University West Lafayette Indiana 47907 USA Institut de Recherches Subatomiques Strasbourg France Ohio State University Columbus Ohio 43210 USA Wayne State University Detroit Michigan 48201 USA University of Frankfurt Frankfurt Germany Yale University New Haven Connecticut 06520 USA University of Rajasthan Jaipur 302004 India University of Washington Seattle Washington 98195 USA Brookhaven National Laboratory Upton New York 11973 USA Rice University Houston Texas 77251 USA SUBATECH Nantes France Moscow Engineering Physics Institute Moscow Russia Nuclear Physics Institute AS CR 250 68 Řež/Prague Czech Republic Argonne National Laboratory Argonne Illinois 60439 USA Shanghai Institute of Applied Physics Shanghai 201800 China Lawrence Berkeley National Laboratory Berkeley California 94720 USA University of California Davis California 95616 USA University of Science & Technology of China Anhui 230027 China University of California Los Angeles California 90095 USA Tsinghua University Beijing 100084 China Creighton University Omaha Nebraska 68178 USA University of California Berkeley California 94720 USA Universidade de Sao Paulo Sao Paulo Brazil Institute of High Energy Physics Protvino Russia Institute of Physics Bhubaneswar 751005 India Max-Planck-Institut für Physik Munich Germany Texas A&M University College Station Texas 77843 USA Valparaiso University Valparaiso Indiana 46383 USA University of Jammu Jammu 180001 India Pennsylvania State University University Park Pennsylvania 16802 USA University of Texas Austin Texas 78712 USA California Institute of

We present STAR measurements of charged hadron production as a function of centrality in Au+Au collisions at sNN=130GeV. The measurements cover a phase space region of 0.2pTcut, and studied the results in the framework of participant and binary scaling. No clear evidence is observed for participant scaling of charged hadron yield in the measured pT region. The relative importance of hard scattering processes is investigated through binary scaling fraction of particle production.

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Azimuthal Anisotropy and Correlations at Large Transverse Momenta in p+p and Au+Au Collisions at sNN=200 GeV

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Physical Review Letters 2004年第25期93卷 252301-252301页

作者： J. Adams M. M. Aggarwal Z. Ahammed J. Amonett B. D. Anderson D. Arkhipkin G. S. Averichev S. K. Badyal Y. Bai J. Balewski O. Barannikova L. S. Barnby J. Baudot S. Bekele V. V. Belaga R. Bellwied J. Berger B. I. Bezverkhny S. Bharadwaj A. Bhasin A. K. Bhati V. S. Bhatia H. Bichsel A. Billmeier L. C. Bland C. O. Blyth B. E. Bonner M. Botje A. Boucham A. V. Brandin A. Bravar M. Bystersky R. V. Cadman X. Z. Cai H. Caines M. Calderón de la Barca Sánchez J. Carroll J. Castillo D. Cebra Z. Chajecki P. Chaloupka S. Chattopdhyay H. F. Chen Y. Chen J. Cheng M. Cherney A. Chikanian W. Christie J. P. Coffin T. M. Cormier J. G. Cramer H. J. Crawford D. Das S. Das M. M. de Moura A. A. Derevschikov L. Didenko T. Dietel S. M. Dogra W. J. Dong X. Dong J. E. Draper F. Du A. K. Dubey V. B. Dunin J. C. Dunlop M. R. Dutta Mazumdar V. Eckardt W. R. Edwards L. G. Efimov V. Emelianov J. Engelage G. Eppley B. Erazmus M. Estienne P. Fachini J. Faivre R. Fatemi J. Fedorisin K. Filimonov P. Filip E. Finch V. Fine Y. Fisyak K. J. Foley K. Fomenko J. Fu C. A. Gagliardi J. Gans M. S. Ganti L. Gaudichet F. Geurts V. Ghazikhanian P. Ghosh J. E. Gonzalez O. Grachov O. Grebenyuk D. Grosnick S. M. Guertin Y. Guo A. Gupta T. D. Gutierrez T. J. Hallman A. Hamed D. Hardtke J. W. Harris M. Heinz T. W. Henry S. Hepplemann B. Hippolyte A. Hirsch E. Hjort G. W. Hoffmann H. Z. Huang S. L. Huang E. W. Hughes T. J. Humanic G. Igo A. Ishihara P. Jacobs W. W. Jacobs M. Janik H. Jiang P. G. Jones E. G. Judd S. Kabana K. Kang M. Kaplan D. Keane V. Yu. Khodyrev J. Kiryluk A. Kisiel E. M. Kislov J. Klay S. R. Klein A. Klyachko D. D. Koetke T. Kollegger M. Kopytine L. Kotchenda M. Kramer P. Kravtsov V. I. Kravtsov K. Krueger C. Kuhn A. I. Kulikov A. Kumar C. L. Kunz R. Kh. Kutuev A. A. Kuznetsov M. A. C. Lamont J. M. Landgraf S. Lange F. Laue J. Lauret A. Lebedev R. Lednicky S. Lehocka M. J. LeVine C. Li Q. Li Y. Li S. J. Lindenbaum M. A. Lisa F. Liu L. Liu Q. J. Liu Z. Liu T. Ljubicic W. J. Llope H. Long R. S. Longacre M. Lopez-Noriega W. A. Love Y. Lu T. Ludlam D University of Birmingham Birmingham United Kingdom Panjab University Chandigarh 160014 India Variable Energy Cyclotron Centre Kolkata 700064 India Kent State University Kent Ohio 44242 USA Particle Physics Laboratory (JINR) Dubna Russia Laboratory for High Energy (JINR) Dubna Russia University of Jammu Jammu 180001 India NIKHEF Amsterdam The Netherlands Indiana University Bloomington Indiana 47408 USA Purdue University West Lafayette Indiana 47907 USA Institut de Recherches Subatomiques Strasbourg France The Ohio State University Columbus Ohio 43210 USA Wayne State University Detroit Michigan 48201 USA University of Frankfurt Frankfurt Germany Yale University New Haven Connecticut 06520 USA University of Rajasthan Jaipur 302004 India University of Washington Seattle Washington 98195 USA Brookhaven National Laboratory Upton New York 11973 USA Rice University Houston Texas 77251 USA SUBATECH Nantes France Moscow Engineering Physics Institute Moscow Russia Nuclear Physics Institute AS CR 250 68 Řež/Prague Czech Republic Argonne National Laboratory Argonne Illinois 60439 USA Shanghai Institute of Applied Physics Shanghai 201800 China Lawrence Berkeley National Laboratory Berkeley California 94720 USA University of California Davis California 95616 USA Warsaw University of Technology Warsaw Poland University of Science & Technology of China Anhui 230027 China University of California Los Angeles California 90095 USA Tsinghua University Beijing 100084 China Creighton University Omaha Nebraska 68178 USA University of California Berkeley California 94720 USA Universidade de Sao Paulo Sao Paulo Brazil Institute of High Energy Physics Protvino Russia Institute of Physics Bhubaneswar 751005 India Max-Planck-Institut für Physik Munich Germany Texas A&M University College Station Texas 77843 USA Valparaiso University Valparaiso Indiana 46383 USA University of Bern 3012 Bern Switzerland Pennsylvania State University University Park

Results on high transverse momentum charged particle emission with respect to the reaction plane are presented for Au+Au collisions at sNN=200 GeV. Two- and four-particle correlations results are presented as well as a comparison of azimuthal correlations in Au+Au collisions to those in p+p at the same energy. The elliptic anisotropy v2 is found to reach its maximum at pt∼3 GeV/c, then decrease slowly and remain significant up to pt≈7–10 GeV/c. Stronger suppression is found in the back-to-back high-pt particle correlations for particles emitted out of plane compared to those emitted in plane. The centrality dependence of v2 at intermediate pt is compared to simple models based on jet quenching.

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Pseudorapidity asymmetry and centrality dependence of charged hadron spectra in d+Au collisions at sNN=200GeV

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Physical Review C 2004年第6期70卷 064907-064907页

作者： J. Adams M. M. Aggarwal Z. Ahammed J. Amonett B. D. Anderson D. Arkhipkin G. S. Averichev Y. Bai J. Balewski O. Barannikova L. S. Barnby J. Baudot S. Bekele V. V. Belaga R. Bellwied J. Berger B. I. Bezverkhny S. Bharadwaj A. Bhasin A. K. Bhati V. S. Bhatia H. Bichsel A. Billmeier L. C. Bland C. O. Blyth B. E. Bonner M. Botje A. Boucham A. V. Brandin A. Bravar M. Bystersky R. V. Cadman X. Z. Cai H. Caines M. Calderón de la Barca Sánchez J. Castillo D. Cebra Z. Chajecki P. Chaloupka S. Chattopdhyay H. F. Chen Y. Chen J. Cheng M. Cherney A. Chikanian W. Christie J. P. Coffin T. M. Cormier J. G. Cramer H. J. Crawford D. Das S. Das M. M. de Moura A. A. Derevschikov L. Didenko T. Dietel S. M. Dogra W. J. Dong X. Dong J. E. Draper F. Du A. K. Dubey V. B. Dunin J. C. Dunlop M. R. Dutta Mazumdar V. Eckardt W. R. Edwards L. G. Efimov V. Emelianov J. Engelage G. Eppley B. Erazmus M. Estienne P. Fachini J. Faivre R. Fatemi J. Fedorisin K. Filimonov P. Filip E. Finch V. Fine Y. Fisyak K. Fomenko J. Fu C. A. Gagliardi L. Gaillard J. Gans M. S. Ganti L. Gaudichet F. Geurts V. Ghazikhanian P. Ghosh J. E. Gonzalez O. Grachov O. Grebenyuk D. Grosnick S. M. Guertin Y. Guo A. Gupta T. D. Gutierrez T. J. Hallman A. Hamed D. Hardtke J. W. Harris M. Heinz T. W. Henry S. Hepplemann B. Hippolyte A. Hirsch E. Hjort G. W. Hoffmann H. Z. Huang S. L. Huang E. W. Hughes T. J. Humanic G. Igo A. Ishihara P. Jacobs W. W. Jacobs M. Janik H. Jiang P. G. Jones E. G. Judd S. Kabana K. Kang M. Kaplan D. Keane V. Yu. Khodyrev J. Kiryluk A. Kisiel E. M. Kislov J. Klay S. R. Klein D. D. Koetke T. Kollegger M. Kopytine L. Kotchenda M. Kramer P. Kravtsov V. I. Kravtsov K. Krueger C. Kuhn A. I. Kulikov A. Kumar R. Kh. Kutuev A. A. Kuznetsov M. A. C. Lamont J. M. Landgraf S. Lange F. Laue J. Lauret A. Lebedev R. Lednicky S. Lehocka M. J. LeVine C. Li Q. Li Y. Li G. Lin S. J. Lindenbaum M. A. Lisa F. Liu L. Liu Q. J. Liu Z. Liu T. Ljubicic W. J. Llope H. Long R. S. Longacre M. Lopez-Noriega W. A. Love Y. Lu T. Ludlam D. Lynn G. L. Ma J. G. Ma Y. G. Ma D. Mag University of Birmingham Birmingham United Kingdom Panjab University Chandigarh 160014 India Variable Energy Cyclotron Centre Kolkata 700064 India Kent State University Kent Ohio 44242 USA Particle Physics Laboratory (JINR) Dubna Russia Laboratory for High Energy (JINR) Dubna Russia NIKHEF Amsterdam The Netherlands Indiana University Bloomington Indiana 47408 USA Purdue University West Lafayette Indiana 47907 USA Institut de Recherches Subatomiques Strasbourg France Ohio State University Columbus Ohio 43210 USA Wayne State University Detroit Michigan 48201 USA University of Frankfurt Frankfurt Germany Yale University New Haven Connecticut 06520 USA University of Rajasthan Jaipur 302004 India University of Jammu Jammu 180001 India University of Washington Seattle Washington 98195 USA Brookhaven National Laboratory Upton New York 11973 USA Rice University Houston Texas 77251 USA SUBATECH Nantes France Moscow Engineering Physics Institute Moscow Russia Nuclear Physics Institute AS CR 250 68 Řež/Prague Czech Republic Argonne National Laboratory Argonne Illinois 60439 USA Shanghai Institute of Applied Physics Shanghai 201800 China Lawrence Berkeley National Laboratory Berkeley California 94720 USA University of California Davis California 95616 USA Warsaw University of Technology Warsaw Poland University of Science & Technology of China Anhui 230027 China University of California Los Angeles California 90095 USA Tsinghua University Beijing 100084 China Creighton University Omaha Nebraska 68178 USA University of California Berkeley California 94720 USA Universidade de Sao Paulo Sao Paulo Brazil Institute of High Energy Physics Protvino Russia Institute of Physics Bhubaneswar 751005 India Max-Planck-Institut für Physik Munich Germany Texas A&M University College Station Texas 77843 USA Valparaiso University Valparaiso Indiana 46383 USA University of Bern CH-3012 Bern Switzerland Pennsylvania State University University Park

The pseudorapidity asymmetry and centrality dependence of charged hadron spectra in d+Au collisions at sNN=200GeV are presented. The charged particle density at midrapidity, its pseudorapidity asymmetry, and centrality dependence are reasonably reproduced by a multiphase transport model, by HIJING, and by the latest calculations in a saturation model. Ratios of transverse momentum spectra between backward and forward pseudorapidity are above unity for pT below 5GeV∕c. The ratio of central to peripheral spectra in d+Au collisions shows enhancement at 2

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Measurements of transverse energy distributions in Au+Au collisions at sNN=200GeV

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Physical Review C 2004年第5期70卷 054907-054907页

作者： J. Adams M. M. Aggarwal Z. Ahammed J. Amonett B. D. Anderson D. Arkhipkin G. S. Averichev Y. Bai J. Balewski O. Barannikova L. S. Barnby J. Baudot S. Bekele V. V. Belaga R. Bellwied J. Berger B. I. Bezverkhny S. Bharadwaj V. S. Bhatia H. Bichsel A. Billmeier L. C. Bland C. O. Blyth B. E. Bonner M. Botje A. Boucham A. Brandin A. Bravar M. Bystersky R. V. Cadman X. Z. Cai H. Caines M. Calderón de la Barca Sánchez J. Carroll J. Castillo D. Cebra Z. Chajecki P. Chaloupka S. Chattopdhyay H. F. Chen Y. Chen J. Cheng M. Cherney A. Chikanian W. Christie J. P. Coffin T. M. Cormier J. G. Cramer H. J. Crawford D. Das S. Das M. M. de Moura A. A. Derevschikov L. Didenko T. Dietel W. J. Dong X. Dong J. E. Draper F. Du A. K. Dubey V. B. Dunin J. C. Dunlop M. R. Dutta Mazumdar V. Eckardt W. R. Edwards L. G. Efimov V. Emelianov J. Engelage G. Eppley B. Erazmus M. Estienne P. Fachini J. Faivre R. Fatemi J. Fedorisin K. Filimonov P. Filip E. Finch V. Fine Y. Fisyak K. J. Foley K. Fomenko J. Fu C. A. Gagliardi J. Gans M. S. Ganti L. Gaudichet F. Geurts V. Ghazikhanian P. Ghosh J. E. Gonzalez O. Grachov O. Grebenyuk D. Grosnick S. M. Guertin Y. Guo A. Gupta T. D. Gutierrez T. J. Hallman A. Hamed D. Hardtke J. W. Harris M. Heinz T. W. Henry S. Hepplemann B. Hippolyte A. Hirsch E. Hjort G. W. Hoffmann H. Z. Huang S. L. Huang E. W. Hughes T. J. Humanic G. Igo A. Ishihara P. Jacobs W. W. Jacobs M. Janik H. Jiang P. G. Jones E. G. Judd S. Kabana K. Kang M. Kaplan D. Keane V. Yu. Khodyrev J. Kiryluk A. Kisiel E. M. Kislov J. Klay S. R. Klein A. Klyachko D. D. Koetke T. Kollegger M. Kopytine L. Kotchenda M. Kramer P. Kravtsov V. I. Kravtsov K. Krueger C. Kuhn A. I. Kulikov A. Kumar C. L. Kunz R. Kh. Kutuev A. A. Kuznetsov M. A. C. Lamont J. M. Landgraf S. Lange F. Laue J. Lauret A. Lebedev R. Lednicky S. Lehocka M. J. LeVine C. Li Q. Li Y. Li S. J. Lindenbaum M. A. Lisa F. Liu L. Liu Q. J. Liu Z. Liu T. Ljubicic W. J. Llope H. Long R. S. Longacre M. Lopez-Noriega W. A. Love Y. Lu T. Ludlam D. Lynn G. L. Ma J. G. Ma Y. G. Ma D. Magestro S. M University of Birmingham Birmingham United Kingdom Panjab University Chandigarh 160014 India Variable Energy Cyclotron Centre Kolkata 700064 India Kent State University Kent Ohio 44242 USA Particle Physics Laboratory (JINR) Dubna Russia Laboratory for High Energy (JINR) Dubna Russia NIKHEF Amsterdam The Netherlands Indiana University Bloomington Indiana 47408 USA Purdue University West Lafayette Indiana 47907 USA Institut de Recherches Subatomiques Strasbourg France Ohio State University Columbus Ohio 43210 USA Wayne State University Detroit Michigan 48201 USA University of Frankfurt Frankfurt Germany Yale University New Haven Connecticut 06520 USA University of Rajasthan Jaipur 302004 India University of Washington Seattle Washington 98195 USA Brookhaven National Laboratory Upton New York 11973 USA Rice University Houston Texas 77251 USA SUBATECH Nantes France Moscow Engineering Physics Institute Moscow Russia Nuclear Physics Institute AS CR 250 68 Řež/Prague Czech Republic Argonne National Laboratory Argonne Illinois 60439 USA Shanghai Institute of Applied Physics Shanghai 201800 People’s Republic of China Lawrence Berkeley National Laboratory Berkeley California 94720 USA University of California Davis California 95616 USA Warsaw University of Technology Warsaw Poland University of Science & Technology of China Anhui 230027 China University of California Los Angeles California 90095 USA Tsinghua University Beijing People’s Republic of China Creighton University Omaha Nebraska 68178 USA University of California Berkeley California 94720 USA Universidade de Sao Paulo Sao Paulo Brazil Institute of High Energy Physics Protvino Russia Insitute of Physics Bhubaneswar 751005 India Max-Planck-Institut für Physik Munich Germany Texas A&M University College Station Texas 77843 USA Valparaiso University Valparaiso Indiana 46383 USA University of Jammu Jammu 180001 India University of Bern Bern Switzerland CH-3012 Pennsylvania St

Transverse energy (ET) distributions have been measured for Au+Au collisions at sNN=200GeV by the STAR Collaboration at RHIC. ET is constructed from its hadronic and electromagnetic components, which have been measured separately. ET production for the most central collisions is well described by several theoretical models whose common feature is large energy density achieved early in the fireball evolution. The magnitude and centrality dependence of ET per charged particle agrees well with measurements at lower collision energy, indicating that the growth in ET for larger collision energy results from the growth in particle production. The electromagnetic fraction of the total ET is consistent with a final state dominated by mesons and independent of centrality.

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Production of e+e− pairs accompanied by nuclear dissociation in ultraperipheral heavy-ion collisions

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Physical Review C 2004年第3期70卷 031902(R)-031902(R)页

作者： J. Adams M. M. Aggarwal Z. Ahammed J. Amonett B. D. Anderson D. Arkhipkin G. S. Averichev Y. Bai J. Balewski O. Barannikova L. S. Barnby J. Baudot S. Bekele V. V. Belaga R. Bellwied J. Berger B. I. Bezverkhny S. Bharadwaj V. S. Bhatia H. Bichsel A. Billmeier L. C. Bland C. O. Blyth B. E. Bonner M. Botje A. Boucham A. Brandin A. Bravar M. Bystersky R. V. Cadman X. Z. Cai H. Caines M. Calderón de la Barca Sánchez J. Carroll J. Castillo D. Cebra Z. Chajecki P. Chaloupka S. Chattopdhyay H. F. Chen Y. Chen J. Cheng M. Cherney A. Chikanian W. Christie J. P. Coffin T. M. Cormier J. G. Cramer H. J. Crawford D. Das S. Das M. M. de Moura A. A. Derevschikov L. Didenko T. Dietel W. J. Dong X. Dong J. E. Draper F. Du A. K. Dubey V. B. Dunin J. C. Dunlop M. R. Dutta Mazumdar V. Eckardt W. R. Edwards L. G. Efimov V. Emelianov J. Engelage G. Eppley B. Erazmus M. Estienne P. Fachini J. Faivre R. Fatemi J. Fedorisin K. Filimonov P. Filip E. Finch V. Fine Y. Fisyak K. J. Foley K. Fomenko J. Fu C. A. Gagliardi J. Gans M. S. Ganti L. Gaudichet F. Geurts V. Ghazikhanian P. Ghosh J. E. Gonzalez O. Grachov O. Grebenyuk D. Grosnick S. M. Guertin Y. Guo A. Gupta T. D. Gutierrez T. J. Hallman A. Hamed D. Hardtke J. W. Harris M. Heinz T. W. Henry S. Hepplemann B. Hippolyte A. Hirsch E. Hjort G. W. Hoffmann H. Z. Huang S. L. Huang E. W. Hughes T. J. Humanic G. Igo A. Ishihara P. Jacobs W. W. Jacobs M. Janik H. Jiang P. G. Jones E. G. Judd S. Kabana K. Kang M. Kaplan D. Keane V. Yu. Khodyrev J. Kiryluk A. Kisiel E. M. Kislov J. Klay S. R. Klein A. Klyachko D. D. Koetke T. Kollegger M. Kopytine L. Kotchenda M. Kramer P. Kravtsov V. I. Kravtsov K. Krueger C. Kuhn A. I. Kulikov A. Kumar C. L. Kunz R. Kh. Kutuev A. A. Kuznetsov M. A.C. Lamont J. M. Landgraf S. Lange F. Laue J. Lauret A. Lebedev R. Lednicky S. Lehocka M. J. LeVine C. Li Q. Li Y. Li S. J. Lindenbaum M. A. Lisa F. Liu L. Liu Q. J. Liu Z. Liu T. Ljubicic W. J. Llope H. Long R. S. Longacre M. Lopez-Noriega W. A. Love Y. Lu T. Ludlam D. Lynn G. L. Ma J. G. Ma Y. G. Ma D. Magestro S. Ma University of Birmingham Birmingham United Kingdom Panjab University Chandigarh 160014 India Variable Energy Cyclotron Centre Kolkata 700064 India Kent State University Kent Ohio 44242 USA Particle Physics Laboratory (JINR) Dubna Russia Laboratory for High Energy (JINR) Dubna Russia NIKHEF Amsterdam The Netherlands Indiana University Bloomington Indiana 47408 USA Purdue University West Lafayette Indiana 47907 USA Institut de Recherches Subatomiques Strasbourg France Ohio State University Columbus Ohio 43210 USA Wayne State University Detroit Michigan 48201 USA University of Frankfurt Frankfurt Germany Yale University New Haven Connecticut 06520 USA University of Rajasthan Jaipur 302004 India University of Washington Seattle Washington 98195 USA Brookhaven National Laboratory Upton New York 11973 USA Rice University Houston Texas 77251 USA SUBATECH Nantes France Moscow Engineering Physics Institute Moscow Russia Nuclear Physics Institute AS CR 250 68 Řež/Prague Czech Republic Argonne National Laboratory Argonne Illinois 60439 USA Shanghai Institute of Applied Physics Shanghai 201800 People’s Republic of China Lawrence Berkeley National Laboratory Berkeley California 94720 USA University of California Davis California 95616 USA Warsaw University of Technology Warsaw Poland University of Science & Technology of China Anhui 230027 China University of California Los Angeles California 90095 USA Tsinghua University Beijing People’s Republic of China Creighton University Omaha Nebraska 68178 USA University of California Berkeley California 94720 USA Universidade de Sao Paulo Sao Paulo Brazil Institute of High Energy Physics Protvino Russia Insitute of Physics Bhubaneswar 751005 India Max-Planck-Institut für Physik Munich Germany Texas A & M University College Station Texas 77843 USA Valparaiso University Valparaiso Indiana 46383 USA University of Jammu Jammu 180001 India Pennsylvania State University University Park Pennsylvan

We present data on e+e− pair production accompanied by nuclear breakup in ultraperipheral gold-gold collisions at a center of mass energy of 200GeV per nucleon pair. The nuclear breakup requirement selects events at small impact parameters, where higher-order diagrams for pair production should be enhanced. We compare the data with two calculations: one based on the equivalent photon approximation, and the other using lowest-order quantum electrodynamics (QED). The data distributions agree with both calculations, except that the pair transverse momentum spectrum disagrees with the equivalent photon approach. We set limits on higher-order contributions to the cross section.

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