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Ernst, J; Gollin, G D; Hans, R M; Johnson, E; Karliner, I; Marsh, M A; Plager, C; Sedlack, C; Selen, M; Williams, J; Bean, A; Zhao, X; Anderson, S; Frolov, V V; Stepaniak, C J; Urheim, J; Athar, S B; Timm, S; Wappler, F; Gan, K K; Hart, T; Honscheid, K; Hufnagel, D; Kagan, H; Pedlar, T K; von Toerne, E; Zoeller, M M; Severini, H; Hinson, J W; Lee, J; Miller, D H; Shipsey, I P; Cronin-Hennessy, D; Lyon, A L; Thorndike, E H; Coan, T E; Fadeyev, V; Gao, Y S; Maravin, Y; Narsky, I; Stroynowski, R; Ye, J; Wlodek, T; Benslama, K; Boulahouache, C; Bukin, K; Dambasuren, E; Majumder, G; Mountain, R; Skwarnicki, T; Stone, S; Kopp, S; McLean, K W; Godang, R; McGee, S; Bornheim, A; Sun, W M; Jaffe, D E; Masek, G; Paar, H P; Eppich, A; Hill, T S; Morrison, R J; Briere, R A; Chen, G P; Ferguson, T; Vogel, H; Berger, B E; Berkelman, K; Blanc, F; Boisvert, V; Cassel, D G; Drell, P S; Ecklund, K M; Galik, R S; Gibbons, L; Gray, S W; Heltsley, B K; Hsu, L; Jones, C D; Kandaswamy, J; Kreinick, D L; Lohner, M; Meyer, T O; Mistry, N B; Patterson, J R; Peterson, D; Riley, D; Romano, A; Schwarthoff, H; Thayer, J G; Valant-Spaight, B; Viehhauser, G; Warburton, A; Avery, P; Prescott, C; Rubiera, A I; Stoeck, H; Yelton, J; Ershov, A
Physical review letters, 2001-Aug-06, 20010806, Letnik: 87, Številka: 6Journal Article
Using 12.7 fb(-1) of data collected with the CLEO detector at CESR, we observed two-photon production of the cc states chi(c0) and chi(c2) in their decay to pi(+)pi(-)pi(+)pi(-). We measured gamma(gammagamma)(chi(c))xB(chi(c)-->pi(+)pi(-)pi(+)pi(-)) to be 75+/-13(stat)+/-8(syst) eV for the chi(c0) and 6.4+/-1.8(stat)+/-0.8(syst) eV for the chi(c2), implying gamma(gammagamma)(chi(c0)) = 3.76+/-0.65(stat)+/-0.41(syst)+/-1.69(br) keV and gamma(gammagamma)(chi(c2)) = 0.53+/-0.15(stat)+/-0.06(syst)+/-0.22(br) keV. Also, cancellation of dominant experimental and theoretical uncertainties permits a precise comparison of gamma(gammagamma)(chi(c0))/gamma(gammagamma)(chi(c2)), evaluated to be 7.4+/-2.4(stat)+/-0.5(syst)+/-0.9(br), with QCD-based predictions.
