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  • Coherent diffractive photop...
    Agakishiev, G.; Ahammed, Z.; Aoyama, R.; Arkhipkin, D.; Averichev, G. S.; Behera, A.; Bielcik, J.; Bland, L. C.; Brandin, A. V.; Butterworth, J.; Campbell, J. M.; Chakaberia, I.; Chaloupka, P.; Crawford, H. J.; Dedovich, T. G.; Didenko, L.; Drachenberg, J. L.; Dunkelberger, L. E.; Engelage, J.; Fatemi, R.; Fazio, S.; Federic, P.; Federicova, P.; Fisyak, Y.; Garand, D.; Geurts, F.; He, L.; Heppelmann, S.; Huang, X.; Humanic, T. J.; Huo, P.; Igo, G.; Jowzaee, S.; Kalinkin, D.; Kauder, K.; Kechechyan, A.; Khan, Z.; Kikoła, D. P.; Kocmanek, M.; Kosarzewski, L. K.; Kulathunga, N.; Li, X.; Li, Y.; Lin, T.; Ljubicic, T.; Lomnitz, M.; Ma, L.; Magdy, N.; Majka, R.; Markert, C.; Meehan, K.; Mei, J. C.; Mustafa, M. K.; Okorokov, V. A.; Pak, R.; Pei, H.; Porter, J.; Pruthi, N. K.; Przybycien, M.; Qiu, H.; Ramachandran, S.; Ray, R. L.; Rehbein, M. J.; Ritter, H. G.; Sahoo, N. R.; Sandweiss, J.; Saur, M.; Schweid, B. R.; Shah, N.; Shanmuganathan, P. V.; Shi, Z.; Shi, S. S.; Sikora, R.; Simko, M.; Singha, S.; Skoby, M. J.; Sorensen, P.; Stringfellow, B.; Sugiura, T.; Sun, X.; Tang, A. H.; Tlusty, D.; Todoroki, T.; Trentalange, S.; Ullrich, T.; Upsal, I.; Van Buren, G.; Videbæk, F.; Wang, F.; Wissink, S. W.; Witt, R.; Xiao, Z. G.; Xu, N.; Xu, Q. H.; Yang, Y.; Yang, Q.; Zbroszczyk, H.; Zhang, J.; Zhou, L.; Zyzak, M.

    Physical review. C, 11/2017, Letnik: 96, Številka: 5
    Journal Article

    Here, the STAR Collaboration reports on the photoproduction of π+π- pairs in goldgold collisions at a center-of-mass energy of 200 GeV/nucleon-pair. These pion pairs are produced when a nearly-real photon emitted by one ion scatters from the other ion. We fit the π+π- invariant mass spectrum with a combination of 0 and ! resonances and a direct π+π- continuum. This is the first observation of the ! in ultra-peripheral collisions, and the first measurement of ρ - ω interference at energies where photoproduction is dominated by Pomeron exchange.