Photoproduction of J/ψ and of high mass e+e− in ultra-peripheral Au+Au collisions at sNN=200 GeV

Photoproduction of J/ψ and of high mass e+e− in ultra-peripheral Au+Au collisions at sNN=200 GeV

We present the first measurement of photoproduction of J/ψ and of two-photon production of high-mass e+e− pairs in electromagnetic (or ultra-peripheral) nucleus–nucleus interactions, using Au+Au data at sNN=200 GeV. The events are tagged with forward neutrons emitted following Coulomb excitation of...

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Veröffentlicht in:Physics letters. B 2009-08, Vol.679 (4), p.321-329
Hauptverfasser: Akiba, Y., Aoki, K., Aphecetche, L., Averbeck, R., Babintsev, V., Barish, K.N., Bassalleck, B., Bathe, S., Bazilevsky, A., Bennett, R., Berdnikov, Y., Brooks, M.L., Bumazhnov, V., Campbell, S., Chai, J.-S., Chiu, M., Cobigo, Y., del Valle, Z. Conesa, Csanád, M., Dahms, T., Delagrange, H., d'Enterria, D., Deshpande, A., Dietzsch, O., Dzhordzhadze, V., Enokizono, A., Espagnon, B., Gastineau, F., Glenn, A., Gosset, J., Goto, Y., Greene, S.V., Perdekamp, M. Grosse, Gunji, T., Hachiya, T., Henni, A. Hadj, Haslum, E., Holmes, M., Holzmann, W., Homma, K., Hong, B., Isenhower, L., Issah, M., Isupov, A., Jia, J., Jin, J., Jouan, D., Kang, J.H., Kawagishi, T., Kiss, A., Kistenev, E., Klein-Boesing, C., Komkov, B., Kurita, K., Leckey, S., Lee, D.M., Lee, M.K., Leitch, M.J., Leite, M.A.L., Litvinenko, A., Matathias, F., Moss, J.M., Moukhanova, T.V., Nagamiya, S., Ohnishi, H., Oskarsson, A., Otterlund, I., Pate, S.F., Pisani, R.P., Rak, J., Roche, G., Romana, A., Rosendahl, S.S.E., Sakaguchi, T., Sawada, S., Seto, R., Shea, T.K., Shimomura, M., Silvermyr, D., Singh, V., Smith, W.C., Stankus, P.W., Stenlund, E., Takagui, E.M., Tanaka, Y., Tarján, P., Togawa, M., Tram, V.-N., Tsuchimoto, Y., Tuli, S.K., Tyurin, N., Vale, C., Vertesi, R., Wagner, M., Wessels, J., Willis, N., Winter, D., Wysocki, M., Yanovich, A., Yushmanov, I.E.
Format: Artikel
Sprache:eng
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Exact sciences and technology
Nuclear physics
Physics
The physics of elementary particles and fields
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Zusammenfassung:We present the first measurement of photoproduction of J/ψ and of two-photon production of high-mass e+e− pairs in electromagnetic (or ultra-peripheral) nucleus–nucleus interactions, using Au+Au data at sNN=200 GeV. The events are tagged with forward neutrons emitted following Coulomb excitation of one or both Au⋆ nuclei. The event sample consists of 28 events with me+e−>2 GeV/c2 with zero like-sign background. The measured cross sections at midrapidity of dσ/dy(J/ψ+Xn,y=0)=76±33(stat)±11(syst) μb and d2σ/dmdy(e+e−+Xn,y=0)=86±23(stat)±16(syst) μb/(GeV/c2) for me+e−∈[2.0,2.8] GeV/c2 have been compared and found to be consistent with models for photoproduction of J/ψ and QED based calculations of two-photon production of e+e− pairs.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2009.07.061