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Experimental investigation of the two-photon widths of the chi(c0) and the chi(c2) mesons |
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| Authors: | Eisenstein B I Ernst J Gladding G E Gollin G D Hans R M Johnson E Karliner I Marsh M A Plager C Sedlack C Selen M Thaler J J Williams J Edwards K W Sadoff A J Ammar R Bean A Besson D Zhao X Anderson S Frolov V V Kubota Y Lee S J Poling R 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 Eckhart E Gan K K Gwon C Hart T Honscheid K Hufnagel D Kagan H Kass R Pedlar T K Thayer J B von Toerne E Zoeller M M Richichi S J Severini H Skubic P Undrus A Savinov V Chen S Hinson J W Lee J Miller D H Shibata E I Shipsey I P Pavlunin V |
| Institution: | University of Illinois, Urbana-Champaign, Illinois 61801. |
| Abstract: | 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. |
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