Two-photon widths of the χcJ states of charmonium

K. M. Ecklund,W. Love, V. Savinov,A. Lopez,H. Mendez,J. Ramirez,J. Y. Ge,D. H. Miller, I. P. J. Shipsey,B. Xin,G. S. Adams,M. Anderson,J. P. Cummings,I. Danko,D. Hu,J. Napolitano,J. Insler,H. Muramatsu,E. H. Thorndike, F. Yang,M. Artuso,S. Blusk, S. Khalil,J. Li,S. Nisar, K. Randrianarivony,N. Sultana, T. Skwarnicki,S. Stone,J. C. Wang,L. M. Zhang,G. Bonvicini,D. Cinabro,M. Dubrovin,A. Lincoln,P. Naik, J. Rademacker,D. M. Asner, K. W. Edwards,J. Reed,R. A. Briere,T. Ferguson,G. Tatishvili,H. Vogel,M. E. Watkins,J. L. Rosner,J. P. Alexander, D. G. Cassel,J. E. Duboscq,R. Ehrlich,R. S. Galik, L. Gibbons,R. Gray, S. W. Gray,D. L. Hartill,D. Hertz,J. M. Hunt,J. Kandaswamy,D. L. Kreinick,V. E. Kuznetsov,J. Ledoux, H. Mahlke-Kruger,D. Mohapatra,J. R. Patterson, D. Peterson, D. Riley, A. Ryd,A. J. Sadoff,S. Stroiney, W. M. Sun,T. Wilksen,S. B. Athar, R. Patel, J. Yelton, P. Rubin, B. I. Eisenstein, I. Karliner,S. Mehrabyan, N. Lowrey,M. Selen,E. J. White,J. Wiss,R. E. Mitchell, D. Besson,T. K. Pedlar,D. Cronin-Hennessy,K. Y. Gao,J. Hietala,Y. Kubota,T. Klein,B. W. Lang,R. Poling,A. W. Scott,P. Zweber,S. Dobbs, Z. Metreveli,K. K. Seth, A. Tomaradze,J. Libby,A. Powell, G. Wilkinson,P. Zweber,S. Dobbs,Z. Metreveli,K. Seth, A. Tomaradze,J. Libby,A. Powell, G. Wilkinson

PHYSICAL REVIEW D（2008）

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摘要

Using a data sample of 24.5 x 10(6) psi(2S) the reactions psi(2S) -> gamma chi(cJ), chi(cJ) -> gamma gamma have been studied for the first time to determine the two-photon widths of the chi(cJ) states of charmonium in their decay into two photons. The measured quantities are B(psi(2S) - gamma chi(c0)) x B(chi(c0) -> gamma gamma) = (2.17 +/- 0.32 +/- 0.10) x 10(-5) and B(psi(2S) -> gamma chi(c2)) x B(chi(c2) -> gamma gamma ) = (2.68 +/- 0.28 +/- 0.15) x 10(-5). Using values for B(psi(2S) -> gamma chi(c0),(c2)) and Gamma(chi(c0,c2)) from the literature the two-photon widths are derived to be Gamma gamma gamma(chi(c0)) = (2.36 +/- 0.35 +/- 0.22) keV, Gamma(gamma gamma)(chi(c2)) = (0.66 +/- 0.07 +/- 0.06) keV, and R equivalent to Gamma(gamma gamma)(chi(c2))/Gamma(gamma gamma)(chi(c0)) = 0.278 +/- 0.050 +/- 0.036. The importance of the measurement of R is emphasized. For the forbidden transition, chi(c1) -> gamma gamma, an upper limit of Gamma(gamma gamma)(chi(c1)) < 0.03 keV is established.

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关键词

particle decay,gamma radiation,photons,b mesons,elementary particles

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