Phys. Rev. C
85,
014910
(2012)
[7 pages]
ρ0 photoproduction in AuAu collisions at √sNN=62.4 GeV measured with the STAR detector
G. Agakishiev et al. (STAR Collaboration)
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G. Agakishiev17, M. M. Aggarwal29, Z. Ahammed47, A. V. Alakhverdyants17, I. Alekseev15, J. Alford18, B. D. Anderson18, C. D. Anson27, D. Arkhipkin2, G. S. Averichev17, J. Balewski22, D. R. Beavis2, N. K. Behera13, R. Bellwied43, M. J. Betancourt22, R. R. Betts7, A. Bhasin16, A. K. Bhati29, H. Bichsel49, J. Bielcik9, J. Bielcikova10, L. C. Bland2, I. G. Bordyuzhin15, W. Borowski40, J. Bouchet18, E. Braidot26, A. V. Brandin25, A. Bridgeman1, S. G. Brovko4, E. Bruna52, S. Bueltmann28, I. Bunzarov17, T. P. Burton2, X. Z. Cai39, H. Caines52, M. Calderón de la Barca Sánchez4, D. Cebra4, R. Cendejas5, M. C. Cervantes41, P. Chaloupka10, S. Chattopadhyay47, H. F. Chen37, J. H. Chen39, J. Y. Chen51, L. Chen51, J. Cheng44, M. Cherney8, A. Chikanian52, K. E. Choi33, W. Christie2, P. Chung10, M. J. M. Codrington41, R. Corliss22, J. G. Cramer49, H. J. Crawford3, A. Davila Leyva42, L. C. De Silva43, R. R. Debbe2, T. G. Dedovich17, J. Deng38, A. A. Derevschikov31, R. Derradi de Souza6, L. Didenko2, P. Djawotho41, S. M. Dogra16, X. Dong21, J. L. Drachenberg41, J. E. Draper4, C. M. Du20, J. C. Dunlop2, L. G. Efimov17, M. Elnimr50, J. Engelage3, G. Eppley35, M. Estienne40, L. Eun30, O. Evdokimov7, R. Fatemi19, J. Fedorisin17, R. G. Fersch19, P. Filip17, E. Finch52, V. Fine2, Y. Fisyak2, C. A. Gagliardi41, F. Geurts35, P. Ghosh47, Y. N. Gorbunov8, A. Gordon2, O. G. Grebenyuk21, D. Grosnick46, A. Gupta16, S. Gupta16, W. Guryn2, B. Haag4, O. Hajkova9, A. Hamed41, L-X. Han39, J. W. Harris52, J. P. Hays-Wehle22, M. Heinz52, S. Heppelmann30, A. Hirsch32, E. Hjort21, G. W. Hoffmann42, D. J. Hofman7, B. Huang37, H. Z. Huang5, T. J. Humanic27, L. Huo41, G. Igo5, P. Jacobs21, W. W. Jacobs14, C. Jena12, F. Jin39, J. Joseph18, E. G. Judd3, S. Kabana40, K. Kang44, J. Kapitan10, K. Kauder7, H. W. Ke51, D. Keane18, A. Kechechyan17, D. Kettler49, D. P. Kikola32, J. Kiryluk21, A. Kisiel48, V. Kizka17, S. R. Klein21, A. G. Knospe52, D. D. Koetke46, T. Kollegger11, J. Konzer32, I. Koralt28, L. Koroleva15, W. Korsch19, L. Kotchenda25, V. Kouchpil10, P. Kravtsov25, K. Krueger1, M. Krus9, L. Kumar18, M. A. C. Lamont2, J. M. Landgraf2, S. LaPointe50, J. Lauret2, A. Lebedev2, R. Lednicky17, J. H. Lee2, W. Leight22, M. J. LeVine2, C. Li37, L. Li42, N. Li51, W. Li39, X. Li32, X. Li38, Y. Li44, Z. M. Li51, L. M. Lima36, M. A. Lisa27, F. Liu51, H. Liu4, J. Liu35, T. Ljubicic2, W. J. Llope35, R. S. Longacre2, Y. Lu37, E. V. Lukashov25, X. Luo37, G. L. Ma39, Y. G. Ma39, D. P. Mahapatra12, R. Majka52, O. I. Mall4, R. Manweiler46, S. Margetis18, C. Markert42, H. Masui21, H. S. Matis21, D. McDonald35, T. S. McShane8, A. Meschanin31, R. Milner22, N. G. Minaev31, S. Mioduszewski41, M. K. Mitrovski2, Y. Mohammed41, B. Mohanty47, M. M. Mondal47, B. Morozov15, D. A. Morozov31, M. G. Munhoz36, M. K. Mustafa32, M. Naglis21, B. K. Nandi13, T. K. Nayak47, L. V. Nogach31, S. B. Nurushev31, G. Odyniec21, A. Ogawa2, K. Oh33, A. Ohlson52, V. Okorokov25, E. W. Oldag42, R. A. N. Oliveira36, D. Olson21, M. Pachr9, B. S. Page14, S. K. Pal47, Y. Pandit18, Y. Panebratsev17, T. Pawlak48, H. Pei7, T. Peitzmann26, C. Perkins3, W. Peryt48, P. Pile2, M. Planinic53, M. A. Ploskon21, J. Pluta48, D. Plyku28, N. Poljak53, J. Porter21, A. M. Poskanzer21, B. V. K. S. Potukuchi16, C. B. Powell21, D. Prindle49, C. Pruneau50, N. K. Pruthi29, P. R. Pujahari13, J. Putschke52, H. Qiu20, R. Raniwala34, S. Raniwala34, R. L. Ray42, R. Redwine22, R. Reed4, H. G. Ritter21, J. B. Roberts35, O. V. Rogachevskiy17, J. L. Romero4, L. Ruan2, J. Rusnak10, N. R. Sahoo47, I. Sakrejda21, S. Salur4, J. Sandweiss52, E. Sangaline4, A. Sarkar13, J. Schambach42, R. P. Scharenberg32, J. Schaub46, A. M. Schmah21, N. Schmitz23, T. R. Schuster11, J. Seele22, J. Seger8, I. Selyuzhenkov14, P. Seyboth23, N. Shah5, E. Shahaliev17, M. Shao37, M. Sharma50, S. S. Shi51, Q. Y. Shou39, E. P. Sichtermann21, F. Simon23, R. N. Singaraju47, M. J. Skoby32, N. Smirnov52, D. Solanki34, P. Sorensen2, U. G. deSouza36, H. M. Spinka1, B. Srivastava32, T. D. S. Stanislaus46, S. G. Steadman22, J. R. Stevens14, R. Stock11, M. Strikhanov25, B. Stringfellow32, A. A. P. Suaide36, M. C. Suarez7, N. L. Subba18, M. Sumbera10, X. M. Sun21, Y. Sun37, Z. Sun20, B. Surrow22, D. N. Svirida15, T. J. M. Symons21, A. Szanto de Toledo36, J. Takahashi6, A. H. Tang2, Z. Tang37, L. H. Tarini50, T. Tarnowsky24, D. Thein42, J. H. Thomas21, J. Tian39, A. R. Timmins43, D. Tlusty10, M. Tokarev17, T. A. Trainor49, S. Trentalange5, R. E. Tribble41, P. Tribedy47, B. A. Trzeciak48, O. D. Tsai5, T. Ullrich2, D. G. Underwood1, G. Van Buren2, G. van Nieuwenhuizen22, J. A. Vanfossen, Jr.18, R. Varma13, G. M. S. Vasconcelos6, A. N. Vasiliev31, F. Videbæk2, Y. P. Viyogi47, S. Vokal17, S. A. Voloshin50, M. Wada42, M. Walker22, F. Wang32, G. Wang5, H. Wang24, J. S. Wang20, Q. Wang32, X. L. Wang37, Y. Wang44, G. Webb19, J. C. Webb2, G. D. Westfall24, C. Whitten, Jr.5,*, H. Wieman21, S. W. Wissink14, R. Witt45, W. Witzke19, Y. F. Wu51, Z. Xiao44, W. Xie32, H. Xu20, N. Xu21, Q. H. Xu38, W. Xu5, Y. Xu37, Z. Xu2, L. Xue39, Y. Yang20, Y. Yang51, P. Yepes35, K. Yip2, I-K. Yoo33, M. Zawisza48, H. Zbroszczyk48, W. Zhan20, J. B. Zhang51, S. Zhang39, W. M. Zhang18, X. P. Zhang44, Y. Zhang21, Z. P. Zhang37, F. Zhao5, J. Zhao39, C. Zhong39, X. Zhu44, Y. H. Zhu39, and Y. Zoulkarneeva17 (STAR Collaboration)
1Argonne National Laboratory, Argonne, Illinois 60439, USA
2Brookhaven National Laboratory, Upton, New York 11973, USA
3University of California, Berkeley, California 94720, USA
4University of California, Davis, California 95616, USA
5University of California, Los Angeles, California 90095, USA
6Universidade Estadual de Campinas, Sao Paulo, Brazil
7University of Illinois at Chicago, Chicago, Illinois 60607, USA
8Creighton University, Omaha, Nebraska 68178, USA
9Czech Technical University in Prague, FNSPE, Prague CZ-115 19, Czech Republic
10Nuclear Physics Institute AS CR, CZ-250 68 Řež/Prague, Czech Republic
11University of Frankfurt, Frankfurt, Germany
12Institute of Physics, Bhubaneswar 751005, India
13Indian Institute of Technology, Mumbai, India
14Indiana University, Bloomington, Indiana 47408, USA
15Alikhanov Institute for Theoretical and Experimental Physics, Moscow, Russia
16University of Jammu, Jammu 180001, India
17Joint Institute for Nuclear Research, Dubna 141 980, Russia
18Kent State University, Kent, Ohio 44242, USA
19University of Kentucky, Lexington, Kentucky 40506-0055, USA
20Institute of Modern Physics, Lanzhou, China
21Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
22Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
23Max-Planck-Institut für Physik, Munich, Germany
24Michigan State University, East Lansing, Michigan 48824, USA
25Moscow Engineering Physics Institute, Moscow, Russia
26NIKHEF and Utrecht University, Amsterdam, The Netherlands
27Ohio State University, Columbus, Ohio 43210, USA
28Old Dominion University, Norfolk, Virginia 23529, USA
29Panjab University, Chandigarh 160014, India
30Pennsylvania State University, University Park, Pennsylvania 16802, USA
31Institute of High Energy Physics, Protvino, Russia
32Purdue University, West Lafayette, Indiana 47907, USA
33Pusan National University, Pusan, Republic of Korea
34University of Rajasthan, Jaipur 302004, India
35Rice University, Houston, Texas 77251, USA
36Universidade de Sao Paulo, Sao Paulo, Brazil
37University of Science & Technology of China, Hefei 230026, China
38Shandong University, Jinan, Shandong 250100, China
39Shanghai Institute of Applied Physics, Shanghai 201800, China
40SUBATECH, Nantes, France
41Texas A&M University, College Station, Texas 77843, USA
42University of Texas, Austin, Texas 78712, USA
43University of Houston, Houston, Texas 77204, USA
44Tsinghua University, Beijing 100084, China
45United States Naval Academy, Annapolis, Maryland 21402, USA
46Valparaiso University, Valparaiso, Indiana 46383, USA
47Variable Energy Cyclotron Centre, Kolkata 700064, India
48Warsaw University of Technology, Warsaw, Poland
49University of Washington, Seattle, Washington 98195, USA
50Wayne State University, Detroit, Michigan 48201, USA
51Institute of Particle Physics, CCNU (HZNU), Wuhan 430079, China
52Yale University, New Haven, Connecticut 06520, USA
53University of Zagreb, Zagreb HR-10002, Croatia
Received 25 July 2011; revised 29 December 2011; published 30 January 2012
Vector mesons may be photoproduced in relativistic heavy-ion collisions when a virtual photon emitted by one nucleus scatters from the other nucleus, emerging as a vector meson. The STAR Collaboration has previously presented measurements of coherent ρ0 photoproduction at center of mass energies of 130 GeV and 200 GeV in AuAu collisions. Here, we present a measurement of the cross section at 62.4 GeV; we find that the cross section for coherent ρ0 photoproduction with nuclear breakup is 10.5±1.5±1.6 mb at 62.4 GeV. The cross-section ratio between 200 GeV and 62.4 GeV is 4.4±0.6, less than is predicted by most theoretical models. It is, however, proportionally much larger than the previously observed 15%±55% increase between 130 GeV and 200 GeV.
©2012 American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.85.014910
DOI:
10.1103/PhysRevC.85.014910
PACS:
25.20.Lj, 13.60.-r, 25.75.Dw
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