Phys. Rev. C
70,
031902(R)
(2004)
[6 pages]
Production of e+e− pairs accompanied by nuclear dissociation in ultraperipheral heavy-ion collisions
J. Adams et al. STAR Collaboration
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J. Adams2, M. M. Aggarwal28, Z. Ahammed42, J. Amonett19, B. D. Anderson19, D. Arkhipkin12, G. S. Averichev11, Y. Bai26, J. Balewski16, O. Barannikova31, L. S. Barnby2, J. Baudot17, S. Bekele27, V. V. Belaga11, R. Bellwied45, J. Berger13, B. I. Bezverkhny47, S. Bharadwaj32, V. S. Bhatia28, H. Bichsel44, A. Billmeier45, L. C. Bland3, C. O. Blyth2, B. E. Bonner33, M. Botje26, A. Boucham37, A. Brandin24, A. Bravar3, M. Bystersky10, R. V. Cadman1, X. Z. Cai36, H. Caines47, M. Calderón de la Barca Sánchez3, J. Carroll20, J. Castillo20, D. Cebra6, Z. Chajecki43, P. Chaloupka10, S. Chattopdhyay42, H. F. Chen35, Y. Chen7, J. Cheng40, M. Cherney9, A. Chikanian47, W. Christie3, J. P. Coffin17, T. M. Cormier45, J. G. Cramer44, H. J. Crawford5, D. Das42, S. Das42, M. M. de Moura34, A. A. Derevschikov30, L. Didenko3, T. Dietel13, W. J. Dong7, X. Dong35, J. E. Draper6, F. Du47, A. K. Dubey14, V. B. Dunin11, J. C. Dunlop3, M. R. Dutta Mazumdar42, V. Eckardt22, W. R. Edwards20, L. G. Efimov11, V. Emelianov24, J. Engelage5, G. Eppley33, B. Erazmus37, M. Estienne37, P. Fachini3, J. Faivre17, R. Fatemi16, J. Fedorisin11, K. Filimonov20, P. Filip10, E. Finch47, V. Fine3, Y. Fisyak3, K. J. Foley3, K. Fomenko11, J. Fu40, C. A. Gagliardi38, J. Gans47, M. S. Ganti42, L. Gaudichet37, F. Geurts33, V. Ghazikhanian7, P. Ghosh42, J. E. Gonzalez7, O. Grachov45, O. Grebenyuk26, D. Grosnick41, S. M. Guertin7, Y. Guo45, A. Gupta18, T. D. Gutierrez6, T. J. Hallman3, A. Hamed45, D. Hardtke20, J. W. Harris47, M. Heinz47, T. W. Henry38, S. Hepplemann29, B. Hippolyte47, A. Hirsch31, E. Hjort20, G. W. Hoffmann39, H. Z. Huang7, S. L. Huang35, E. W. Hughes4, T. J. Humanic27, G. Igo7, A. Ishihara39, P. Jacobs20, W. W. Jacobs16, M. Janik43, H. Jiang7, P. G. Jones2, E. G. Judd5, S. Kabana47, K. Kang40, M. Kaplan8, D. Keane19, V. Yu. Khodyrev30, J. Kiryluk21, A. Kisiel43, E. M. Kislov11, J. Klay20, S. R. Klein20, A. Klyachko16, D. D. Koetke41, T. Kollegger13, M. Kopytine19, L. Kotchenda24, M. Kramer25, P. Kravtsov24, V. I. Kravtsov30, K. Krueger1, C. Kuhn17, A. I. Kulikov11, A. Kumar28, C. L. Kunz8, R. Kh. Kutuev12, A. A. Kuznetsov11, M. A.C. Lamont2, J. M. Landgraf3, S. Lange13, F. Laue3, J. Lauret3, A. Lebedev3, R. Lednicky11, S. Lehocka11, M. J. LeVine3, C. Li35, Q. Li45, Y. Li40, S. J. Lindenbaum25, M. A. Lisa27, F. Liu46, L. Liu46, Q. J. Liu44, Z. Liu46, T. Ljubicic3, W. J. Llope33, H. Long7, R. S. Longacre3, M. Lopez-Noriega27, W. A. Love3, Y. Lu46, T. Ludlam3, D. Lynn3, G. L. Ma36, J. G. Ma7, Y. G. Ma36, D. Magestro27, S. Mahajan18, D. P. Mahapatra14, R. Majka47, L. K. Mangotra18, R. Manweiler41, S. Margetis19, C. Markert47, L. Martin37, J. N. Marx20, H. S. Matis20, Yu. A. Matulenko30, C. J. McClain1, T. S. McShane9, F. Meissner20, Yu. Melnick30, A. Meschanin30, M. L. Miller21, Z. Milosevich8, N. G. Minaev30, C. Mironov19, A. Mischke26, D. Mishra14, J. Mitchell33, B. Mohanty42, L. Molnar31, C. F. Moore39, M. J. Mora-Corral22, D. A. Morozov30, V. Morozov20, M. G. Munhoz24, B. K. Nandi42, T. K. Nayak42, J. M. Nelson2, P. K. Netrakanti42, V. A. Nikitin12, L. V. Nogach30, B. Norman19, S. B. Nurushev30, G. Odyniec20, A. Ogawa3, V. Okorokov24, M. Oldenburg20, D. Olson20, S. K. Pal42, Y. Panebratsev11, S. Y. Panitkin3, A. I. Pavlinov45, T. Pawlak43, T. Peitzmann26, V. Perevoztchikov3, C. Perkins5, W. Peryt43, V. A. Petrov12, S. C. Phatak14, R. Picha6, M. Planinic48, J. Pluta43, N. Porile31, J. Porter3, A. M. Poskanzer20, M. Potekhin3, E. Potrebenikova11, B. V.K.S. Potukuchi18, D. Prindle44, C. Pruneau45, J. Putschke22, G. Rai20, G. Rakness29, R. Raniwala32, S. Raniwala32, O. Ravel37, R. L. Ray39, S. V. Razin11, D. Reichhold31, J. G. Reid44, G. Renault37, F. Retiere20, A. Ridiger24, H. G. Ritter20, J. B. Roberts33, O. V. Rogachevskiy11, J. L. Romero6, A. Rose45, C. Roy37, L. Ruan35, I. Sakrejda20, S. Salur47, J. Sandweiss47, I. Savin12, P. S. Sazhin11, J. Schambach39, R. P. Scharenberg31, N. Schmitz22, L. S. Schroeder20, K. Schweda20, J. Seger9, P. Seyboth22, E. Shahaliev11, M. Shao35, W. Shao4, M. Sharma28, W. Q. Shen36, K. E. Shestermanov30, S. S. Shimanskiy11, F. Simon22, R. N. Singaraju42, G. Skoro11, N. Smirnov47, R. Snellings26, G. Sood41, P. Sorensen20, J. Sowinski16, J. Speltz17, H. M. Spinka1, B. Srivastava31, A. Stadnik11, T. D.S. Stanislaus41, R. Stock13, A. Stolpovsky45, M. Strikhanov24, B. Stringfellow31, A. A.P. Suaide34, E. Sugarbaker27, C. Suire3, M. Sumbera10, B. Surrow21, T. J.M. Symons20, A. Szanto de Toledo34, P. Szarwas43, A. Tai7, J. Takahashi34, A. H. Tang26, T. Tarnowsky31, D. Thein7, J. H. Thomas20, S. Timoshenko24, M. Tokarev11, T. A. Trainor44, S. Trentalange7, R. E. Tribble38, O. Tsai7, J. Ulery31, T. Ullrich3, D. G. Underwood1, A. Urkinbaev11, G. Van Buren3, M. van Leeuwen20, A. M. Vander Molen23, R. Varma15, I. M. Vasilevski12, A. N. Vasiliev30, R. Vernet17, S. E. Vigdor16, V. P. Viyogi42, S. Vokal11, S. A. Voloshin45, M. Vznuzdaev24, B. Waggoner9, F. Wang31, G. Wang19, G. Wang4, X. L. Wang35, Y. Wang39, Y. Wang40, Z. M. Wang35, H. Ward39, J. W. Watson19, J. C. Webb16, R. Wells27, G. D. Westfall23, A. Wetzler20, C. Whitten, Jr.7, H. Wieman20, S. W. Wissink16, R. Witt47, J. Wood7, J. Wu35, N. Xu20, Z. Xu35, Z. Z. Xu3, E. Yamamoto20, P. Yepes33, V. I. Yurevich11, Y. V. Zanevsky11, H. Zhang3, W. M. Zhang19, Z. P. Zhang35, P. A. Zolnierczuk16, R. Zoulkarneev12, Y. Zoulkarneeva12, and A. N. Zubarev11 (STAR Collaboration)
1Argonne National Laboratory, Argonne, Illinois 60439, USA
2University of Birmingham, Birmingham, United Kingdom
3Brookhaven National Laboratory, Upton, New York 11973, USA
4California Institute of Technology, Pasedena, California 91125, USA
5University of California, Berkeley, California 94720, USA
6University of California, Davis, California 95616, USA
7University of California, Los Angeles, California 90095, USA
8Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
9Creighton University, Omaha, Nebraska 68178, USA
10Nuclear Physics Institute AS CR, 250 68 Řež/Prague, Czech Republic
11Laboratory for High Energy (JINR), Dubna, Russia
12Particle Physics Laboratory (JINR), Dubna, Russia
13University of Frankfurt, Frankfurt, Germany
14Insitute of Physics, Bhubaneswar 751005, India
15Indian Institute of Technology, Mumbai, India
16Indiana University, Bloomington, Indiana 47408, USA
17Institut de Recherches Subatomiques, Strasbourg, France
18University of Jammu, Jammu 180001, India
19Kent State University, Kent, Ohio 44242, USA
20Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
21Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
22Max-Planck-Institut für Physik, Munich, Germany
23Michigan State University, East Lansing, Michigan 48824, USA
24Moscow Engineering Physics Institute, Moscow, Russia
25City College of New York, New York City, New York 10031, USA
26NIKHEF, Amsterdam, The Netherlands
27Ohio State University, Columbus, Ohio 43210, USA
28Panjab University, Chandigarh 160014, India
29Pennsylvania State University, University Park, Pennsylvania 16802, USA
30Institute of High Energy Physics, Protvino, Russia
31Purdue University, West Lafayette, Indiana 47907, USA
32University of Rajasthan, Jaipur 302004, India
33Rice University, Houston, Texas 77251, USA
34Universidade de Sao Paulo, Sao Paulo, Brazil
35University of Science & Technology of China, Anhui 230027, China
36Shanghai Institute of Applied Physics, Shanghai 201800, People’s Republic of China
37SUBATECH, Nantes, France
38Texas A & M University, College Station, Texas 77843, USA
39University of Texas, Austin, Texas 78712, USA
40Tsinghua University, Beijing, People’s Republic of China
41Valparaiso University, Valparaiso, Indiana 46383, USA
42Variable Energy Cyclotron Centre, Kolkata 700064, India
43Warsaw University of Technology, Warsaw, Poland
44University of Washington, Seattle, Washington 98195, USA
45Wayne State University, Detroit, Michigan 48201, USA
46Institute of Particle Physics, CCNU (HZNU), Wuhan 430079, China
47Yale University, New Haven, Connecticut 06520, USA
48University of Zagreb, Zagreb, HR-10002, Croatia
Received 7 April 2004; published 28 September 2004
We present data on e+e− pair production accompanied by nuclear breakup in ultraperipheral gold-gold collisions at a center of mass energy of 200 GeV 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.
© 2004 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.70.031902
DOI:
10.1103/PhysRevC.70.031902
PACS:
25.75.Dw, 12.20.−m, 25.20.Lj
*URL: http://www.star.bnl.gov
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