rho(0) photoproduction in ultraperipheral relativistic heavy ion collisions at root s(NN)=200 GeV
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Photoproduction reactions occur when the electromagnetic field of a relativistic heavy ion interacts with another heavy ion. The STAR Collaboration presents a measurement of 0 and direct +- photoproduction in ultraperipheral relativistic heavy ion collisions at sNN=200 GeV. We observe both exclusive photoproduction and photoproduction accompanied by mutual Coulomb excitation. We find a coherent cross section of (AuAuAu*Au*0)=53019(stat.)57(syst.) mb, in accord with theoretical calculations based on a Glauber approach, but considerably below the predictions of a color dipole model. The 0 transverse momentum spectrum (pT2) is fit by a double exponential curve including both coherent and incoherent coupling to the target nucleus; we find inc/coh=0. 290.03(stat.)0.08(syst.). The ratio of direct +- to 0 production is comparable to that observed in p collisions at HERA and appears to be independent of photon energy. Finally, the measured 0 spin helicity matrix elements agree within errors with the expected s-channel helicity conservation. 2008 The American Physical Society.
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Abelev, B. I., Aggarwal, M. M., Ahammed, Z., Anderson, B. D., Arkhipkin, D., Averichev, G. S., ... Zuo, J. X.
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Abelev, BI||Aggarwal, MM||Ahammed, Z||Anderson, BD||Arkhipkin, D||Averichev, GS||Bai, Y||Balewski, J||Barannikova, O||Barnby, LS||Baudot, J||Baumgart, S||Beavis, DR||Bellwied, R||Benedosso, F||Betts, RR||Bhardwaj, S||Bhasin, A||Bhati, AK||Bichsel, H||Bielcik, J||Bielcikova, J||Bland, LC||Blyth, S-L||Bombara, M||Bonner, BE||Botje, M||Bouchet, J||Braidot, E||Brandin, AV||Bueltmann, S||Burton, TP||Bystersky, M||Cai, XZ||Caines, H||Sanchez, M Calderon de la Barca||Callner, J||Catu, O||Cebra, D||Cervantes, MC||Chajecki, Z||Chaloupka, P||Chattopadhyay, S||Chen, HF||Chen, JH||Chen, JY||Cheng, J||Cherney, M||Chikanian, A||Choi, KE||Christie, W||Chung, SU||Clarke, RF||Codrington, MJM||Coffin, JP||Cormier, TM||Cosentino, MR||Cramer, JG||Crawford, HJ||Das, D||Dash, S||Daugherity, M||de Moura, MM||Dedovich, TG||DePhillips, M||Derevschikov, AA||de Souza, R Derradi||Didenko, L||Dietel, T||Djawotho, P||Dogra, SM||Dong, X||Drachenberg, JL||Draper, JE||Du, F||Dunlop, JC||Mazumdar, MR Dutta||Edwards, WR||Efimov, LG||Elhalhuli, E||Emelianov, V||Engelage, J||Eppley, G||Erazmus, B||Estienne, M||Eun, L||Fachini, P||Fatemi, R||Fedorisin, J||Feng, A||Filip, P||Finch, E||Fine, V||Fisyak, Y||Fu, J||Gagliardi, CA||Gaillard, L||Ganti, MS||Garcia-Solis, E||Ghazikhanian, V||Ghosh, P||Gorbunov, YN||Gordon, A||Grebenyuk, O||Grosnick, D||Grube, B||Guertin, SM||Guimaraes, KSFF||Gupta, A||Gupta, N||Guryn, W||Haag, B||Hallman, TJ||Hamed, A||Harris, JW||He, W||Heinz, M||Henry, TW||Hepplemann, S||Hippolyte, B||Hirsch, A||Hjort, E||Hoffman, AM||Hoffmann, GW||Hofman, DJ||Hollis, RS||Horner, MJ||Huang, HZ||Hughes, EW||Humanic, TJ||Igo, G||Iordanova, A||Jacobs, P||Jacobs, WW||Jakl, P||Jin, F||Jones, PG||Judd, EG||Kabana, S||Kajimoto, K||Kang, K||Kapitan, J||Kaplan, M||Keane, D||Kechechyan, A||Kettler, D||Khodyrev, V Yu||Kiryluk, J||Kisiel, A||Klein, SR||Knospe, AG||Kocoloski, A||Koetke, DD||Kollegger, T||Kopytine, M||Kotchenda, L||Kouchpil, V||Kowalik, KL||Kravtsov, P||Kravtsov, VI||Krueger, K||Kuhn, C||Kumar, A||Kurnadi, P||Lamont, MAC||Landgraf, JM||Lange, S||LaPointe, S||Laue, F||Lauret, J||Lebedev, A||Lednicky, R||Lee, C-H||LeVine, MJ||Li, C||Li, Q||Li, Y||Lin, G||Lin, X||Lindenbaum, SJ||Lisa, MA||Liu, F||Liu, H||Liu, J||Liu, L||Ljubicic, T||Llope, WJ||Longacre, RS||Love, WA||Lu, Y||Ludlam, T||Lynn, D||Ma, GL||Ma, JG||Ma, YG||Mahapatra, DP||Majka, R||Mangotra, LK||Manweiler, R||Margetis, S||Markert, C||Matis, HS||Matulenko, Yu A||McShane, TS||Meschanin, A||Millane, J||Miller, ML||Minaev, NG||Mioduszewski, S||Mischke, A||Mitchell, J||Mohanty, B||Morozov, DA||Munhoz, MG||Nandi, BK||Nattrass, C||Nayak, TK||Nelson, JM||Nepali, C||Netrakanti, PK||Ng, MJ||Nogach, LV||Nurushev, SB||Odyniec, G||Ogawa, A||Okada, H||Okorokov, V||Olson, D||Pachr, M||Pal, SK||Panebratsev, Y||Pavlinov, AI||Pawlak, T||Peitzmann, T||Perevoztchikov, V||Perkins, C||Peryt, W||Phatak, SC||Planinic, M||Pluta, J||Poljak, N||Porile, N||Poskanzer, AM||Potekhin, M||Potukuchi, BVKS||Prindle, D||Pruneau, C||Pruthi, NK||Putschke, J||Qattan, IA||Raniwala, R||Raniwala, S||Ray, RL||Relyea, D||Ridiger, A||Ritter, HG||Roberts, JB||Rogachevskiy, OV||Romero, JL||Rose, A||Roy, C||Ruan, L||Russcher, MJ||Rykov, V||Sahoo, R||Sakrejda, I||Sakuma, T||Salur, S||Sandweiss, J||Sarsour, M||Schambach, J||Scharenberg, RP||Schmitz, N||Seger, J||Selyuzhenkov, I||Seyboth, P||Shabetai, A||Shahaliev, E||Shao, M||Sharma, M||Shi, X-H||Sichtermann, EP||Simon, F||Singaraju, RN||Skoby, MJ||Smirnov, N||Snellings, R||Sorensen, P||Sowinski, J||Speltz, J||Spinka, HM||Srivastava, B||Stadnik, A||Stanislaus, TDS||Staszak, D||Stock, R||Strikhanov, M||Stringfellow, B||Suaide, AAP||Suarez, MC||Subba, NL||Sumbera, M||Sun, XM||Sun, Z||Surrow, B||Symons, TJM||de Toledo, A Szanto||Takahashi, J||Tang, AH||Tang, Z||Tarnowsky, T||Thein, D||Thomas, JH||Tian, J||Timmins, AR||Timoshenko, S||Tokarev, M||Trainor, TA||Tram, VN||Trattner, AL||Trentalange, S||Tribble, RE||Tsai, OD||Ulery, J||Ullrich, T||Underwood, DG||Van Buren, G||van der Kolk, N||van Leeuwen, M||Molen, AM Vander||Varma, R||Vasconcelos, GMS||Vasilevski, IM||Vasiliev, AN||Vernet, R||Videbaek, F||Vigdor, SE||Viyogi, YP||Vokal, S||Voloshin, SA||Wada, M||Waggoner, WT||Wang, F||Wang, G||Wang, JS||Wang, Q||Wang, X||Wang, XL||Wang, Y||Webb, JC||Westfall, GD||Whitten, C Jr||Wieman, H||Wissink, SW||Witt, R||Wu, J||Wu, Y||Xu, N||Xu, QH||Xu, Z||Yepes, P||Yoo, I-K||Yue, Q||Zawisza, M||Zbroszczyk, H||Zhan, W||Zhang, H||Zhang, S||Zhang, WM||Zhang, Y||Zhang, ZP||Zhao, Y||Zhong, C||Zhou, J||Zoulkarneev, R||Zoulkarneeva, Y||Zuo, JX
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keywords
Colliders
Complex Nuclei
Diffractive
Energies
Hera
Photon
Physics
Production
Proton Scattering
Time Projection Chamber
Vector-meson Production
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http://dx.doi.org/10.1103/PhysRevC.77.034910
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http://dx.doi.org/10.1103/physrevc.77.034910