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Photoproduction of J/psi and of high mass e+e- in ultra-peripheral Au+Au collisions at sqrt(s_NN) = 200 GeV

S. Afanasiev C. Aidala N.N. Ajitanand Y. Akiba J. Alexander A. Al-Jamel K. Aoki Laurent Aphecetche 1 R. Armendariz S.H. Aronson R. Averbeck T.C. Awes B. Azmoun V. Babintsev A. Baldisseri 2 K.N. Barish P.D. Barnes B. Bassalleck S. Bathe S. Batsouli V. Baublis F. Bauer A. Bazilevsky S. Belikov R. Bennett Y. Berdnikov M.T. Bjorndal J.G. Boissevain H. Borel 2 K. Boyle M.L. Brooks D.S. Brown D. Bucher H. Buesching V. Bumazhnov G. Bunce J.M. Burward-Hoy S. Butsyk S. Campbell J.-S. Chai S. Chernichenko J. Chiba C.Y. Chi M. Chiu I.J. Choi T. Chujo V. Cianciolo C.R. Cleven Y. Cobigo 2 B.A. Cole M.P. Comets Z. Conesa del Valle 3 P. Constantin M. Csanad T. Csorgo T. Dahms K. Das G. David H. Delagrange 1 A. Denisov D. d'Enterria A. Deshpande E.J. Desmond O. Dietzsch A. Dion J.L. Drachenberg O. Drapier 3 A. Drees A.K. Dubey A. Durum V. Dzhordzhadze Y.V. Efremenko J. Egdemir A. Enokizono H. En'Yo B. Espagnon S. Esumi D.E. Fields F. Fleuret 3 S.L. Fokin B. Forestier Z. Fraenkel 2 J.E. Frantz A. Franz A.D. Frawley Y. Fukao S.-Y. Fung S. Gadrat F. Gastineau 1 Marie Germain 1 A. Glenn M. Gonin 3 J. Gosset 2 Y. Goto R. Granier de Cassagnac 3 N. Grau S.V. Greene M. Grosse Perdekamp T. Gunji H.-A. Gustafsson T. Hachiya A. Hadj Henni 1 J.S. Haggerty M.N. Hagiwara H. Hamagaki H. Harada E.P. Hartouni K. Haruna M. Harvey E. Haslum K. Hasuko R. Hayano M. Heffner T.K. Hemmick J.M. Heuser X. He H. Hiejima J.C. Hill R. Hobbs M. Holmes W. Holzmann K. Homma B. Hong T. Horaguchi M.G. Hur T. Ichihara K. Imai M. Inaba D. Isenhower L. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov B.V. Jacak J. Jia J. Jin O. Jinnouchi B.M. Johnson K.S. Joo D. Jouan F. Kajihara S. Kametani N. Kamihara M. Kaneta J.H. Kang T. Kawagishi A.V. Kazantsev Steven Kelly A. Khanzadeev D.J. Kim E. Kim Y.-S. Kim E. Kinney A. Kiss E. Kistenev A. Kiyomichi C. Klein-Boesing L. Kochenda V. Kochetkov B. Komkov M. Konno D. Kotchetkov A. Kozlov P.J. Kroon G.J. Kunde N. Kurihara K. Kurita M.J. Kweon Y. Kwon G.S. Kyle R. Lacey J.G. Lajoie A. Lebedev Y. Le Bornec S. Leckey D.M. Lee M.K. Lee M.J. Leitch M.A.L. Leite H. Lim A. Litvinenko M.X. Liu X.H. Li C.F. Maguire Y.I. Makdisi A. Malakhov M.D. Malik V.I. Manko H. Masui F. Matathias M.C. Mccain P.L. Mcgaughey Y. Miake T.E. Miller A. Milov S. Mioduszewski G.C. Mishra J.T. Mitchell D.P. Morrison J.M. Moss T.V. Moukhanova D. Mukhopadhyay J. Murata S. Nagamiya Y. Nagata J.L. Nagle M. Naglis T. Nakamura J. Newby M. Nguyen B.E. Norman A.S. Nyanin J. Nystrand E. O'Brien C.A. Ogilvie H. Ohnishi I.D. Ojha H. Okada K. Okada O.O. Omiwade A. Oskarsson I. Otterlund K. Ozawa D. Pal A.P.T. Palounek V. Pantuev V. Papavassiliou J. Park W.J. Park S.F. Pate H. Pei J.-C. Peng H. Pereira 2 V. Peresedov D.Yu. Peressounko C. Pinkenburg R.P. Pisani M.L. Purschke A.K. Purwar H. Qu J. Rak I. Ravinovich K.F. Read M. Reuter K. Reygers V. Riabov Y. Riabov G. Roche 4 A. Romana 3 M. Rosati S.S.E. Rosendahl P. Rosnet 4 P. Rukoyatkin V.L. Rykov S.S. Ryu B. Sahlmueller N. Saito T. Sakaguchi S. Sakai V. Samsonov H.D. Sato S. Sato S. Sawada V. Semenov R. Seto D. Sharma T.K. Shea I. Shein T.-A. Shibata K. Shigaki M. Shimomura T. Shohjoh K. Shoji A. Sickles C.L. Silva D. Silvermyr K.S. Sim C.P. Singh V. Singh S. Skutnik W.C. Smith A. Soldatov R.A. Soltz W.E. Sondheim S.P. Sorensen I.V. Sourikova F. Staley 2 P.W. Stankus E. Stenlund M. Stepanov A. Ster S.P. Stoll T. Sugitate C. Suire J.P. Sullivan J. Sziklai T. Tabaru S. Takagi E.M. Takagui A. Taketani K.H. Tanaka Y. Tanaka K. Tanida M.J. Tannenbaum A. Taranenko P. Tarjan T.L. Thomas M. Togawa J. Tojo H. Torii R.S. Towell V.-N. Tram 3 I. Tserruya Y. Tsuchimoto S.K. Tuli H. Tydesjo N. Tyurin C. Vale H. Valle H.W. van Hecke J. Velkovska R. Vertesi A.A. Vinogradov E. Vznuzdaev M. Wagner X.R. Wang Y. Watanabe J. Wessels S.N. White N. Willis D. Winter C.L. Woody M. Wysocki W. Xie A. Yanovich S. Yokkaichi G.R. Young I. Younus I.E. Yushmanov W.A. Zajc O. Zaudtke C. Zhang J. Zimanyi L. Zolin
Abstract : We present the first measurement of photoproduction of J/psi and of two-photon production of high-mass e+e- pairs in electromagnetic (or ultra-peripheral) nucleus-nucleus interactions, using Au+Au data at sqrt(s_NN) = 200 GeV. The events are tagged with forward neutrons emitted following Coulomb excitation of one or both Au^{star} nuclei. The event sample consists of 28 events with m_{e+e-} > 2 GeV/c^2 with zero like-sign background. The measured cross sections at midrapidity of d\sigma / dy (J/psi + Xn, y=0) = 76 +/- 33 (stat) +/- 11 (syst) micro b and d^2\sigma/dm dy (e^+e^- + Xn, y=0) = 86 +/- 23 (stat) +/- 16 (syst) micro b/(GeV/c^2) for m_{e+e-} \in [2.0,2.8] GeV/c^2 are consistent with various theoretical predictions.
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Submitted on : Tuesday, March 17, 2009 - 1:54:07 PM
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S. Afanasiev, C. Aidala, N.N. Ajitanand, Y. Akiba, J. Alexander, et al.. Photoproduction of J/psi and of high mass e+e- in ultra-peripheral Au+Au collisions at sqrt(s_NN) = 200 GeV. Physics Letters B, Elsevier, 2009, 679, pp.321-329. ⟨10.1016/j.physletb.2009.07.061⟩. ⟨in2p3-00368713⟩

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