@article{a843a9ffb0d240bbae70c9f36a173d39,
title = "Experimental Investigation of the Two-Photon Widths of the χc0 and the χc2 Mesons",
abstract = "Using 12.7fb-1 of data collected with the CLEO detector at CESR, we observed two-photon production of the cc− states χc0 and χc2 in their decay to Π+Π-Π+Π-. We measured Γγγ(χc)×B(χc→Π+Π-Π+Π-) to be 75·13(stat)·8(syst)eV for the χc0 and 6.4·1.8(stat)·0.8(syst)eV for the χc2, implying γγγ(χc0)=3.76·0.65(stat)·0.41(syst)·1.69(br)keV and Γγγ(χc2)=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 Γγγ(χc0)/Γγγ(χc2), evaluated to be7.4·2.4(stat)·0.5(syst)·0.9(br), with QCD-based predictions.",
author = "{CLEO Collaboration} and Eisenstein, {B. I.} and J. Ernst and Gladding, {G. E.} and Gollin, {G. D.} and Hans, {R. M.} and E. Johnson and I. Karliner and Marsh, {M. A.} and C. Plager and C. Sedlack and M. Selen and Thaler, {J. J.} and J. Williams and Edwards, {K. W.} and Sadoff, {A. J.} and R. Ammar and A. Bean and D. Besson and X. Zhao and S. Anderson and Frolov, {V. V.} and Y. Kubota and Lee, {S. J.} and R. Poling and A. Smith and Stepaniak, {C. J.} and J. Urheim and S. Ahmed and Alam, {M. S.} and Athar, {S. B.} and L. Jian and L. Ling and M. Saleem and S. Timm and F. Wappler and A. Anastassov and E. Eckhart and Gan, {K. K.} and C. Gwon and T. Hart and K. Honscheid and D. Hufnagel and H. Kagan and R. Kass and Pedlar, {T. K.} and Thayer, {J. B.} and {von Toerne}, E. and Zoeller, {M. M.} and Richichi, {S. J.} and D. Cronin-Hennessy",
year = "2001",
month = jul,
day = "24",
doi = "10.1103/PhysRevLett.87.061801",
language = "English (US)",
volume = "87",
journal = "Physical review letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "6",
}