Measurements of the mass, total width, and two-photon partial width of the eta(c) meson

Measurements of the mass, total width, and two-photon partial width of the eta(c) meson

Using 13.4 fb(-1) of data collected with the CLEO detector at the Cornell Electron Storage Ring, we have observed 300 events for the two-photon production of ground-state pseudoscalar charmonium in the decay eta(c)-->K(0)(S)K-/+pi(+/-). We have measured the eta(c) mass to be [2980.4+/-2.3 (stat)+...

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Veröffentlicht in:Physical Review Letters 2000-10, Vol.85 (15), p.3095
Hauptverfasser: Brandenburg, G, Ershov, A, Gao, Y S, Kim, D Y, Wilson, R, Browder, T E, Li, Y, Rodriguez, J L, Yamamoto, H, Bergfeld, T, Eisenstein, B I, Ernst, J, Gladding, G E, Gollin, G D, Hans, R M, Johnson, E, Karliner, I, Marsh, M A, Palmer, M, Plager, C, Sedlack, C, Selen, M, Thaler, J J, Williams, J, Edwards, K W, Janicek, R, Patel, P M, Sadoff, A J, Ammar, R, Bean, A, Besson, D, Davis, R, Kwak, N, Zhao, X, Anderson, S, Frolov, V V, Kubota, Y, Lee, S J, Mahapatra, R, O'Neill, J J, Poling, R, Riehle, T, Smith, A, Stepaniak, C J, Urheim, J, Ahmed, S, Alam, M S, Athar, S B, Jian, L, Ling, L, Saleem, M, Timm, S, Wappler, F, Anastassov, A, Duboscq, J E, Eckhart, E, Gan, K K, Gwon, C, Hart, T, Honscheid, K, Hufnagel, D, Kagan, H, Kass, R, Pedlar, T K, Schwarthoff, H, Thayer, J B, von Toerne, E, Zoeller, M M, Richichi, S J, Severini, H, Skubic, P, Undrus, A, Chen, S, Fast, J, Hinson, J W, Lee, J, Miller, D H, Shibata, E I, Shipsey, I P, Pavlunin, V, Cronin-Hennessy, D, Lyon, A L, Thorndike, E H, Jessop, C P, Marsiske, H, Perl, M L, Savinov, V, Ugolini, D, Zhou, X, Coan, T E, Fadeyev, V, Maravin, Y, Narsky, I, Stroynowski, R, Ye, J, Wlodek, T, Artuso, M, Ayad, R, Boulahouache, C, Bukin, K
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Sprache:eng
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MESONS
PARTICLE ACCELERATORS
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STANFORD LINEAR ACCELERATOR CENTER
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Zusammenfassung:Using 13.4 fb(-1) of data collected with the CLEO detector at the Cornell Electron Storage Ring, we have observed 300 events for the two-photon production of ground-state pseudoscalar charmonium in the decay eta(c)-->K(0)(S)K-/+pi(+/-). We have measured the eta(c) mass to be [2980.4+/-2.3 (stat)+/-0.6 (syst)] MeV and its full width as [27.0+/-5.8 (stat)+/-1.4 (syst)] MeV. We have determined the two-photon partial width of the eta(c) meson to be [7.6+/-0.8 (stat)+/-0.4 (syst)+/-2.3 (br)] keV, with the last uncertainty associated with the decay branching fraction.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.85.3095