APS » Phys. Rev. D » Volume 80 » Issue 7

J. Libby,¹ L. Martin,¹ A. Powell,¹ C. Thomas,¹ G. Wilkinson,¹ H. Mendez,² J. Y. Ge,³ D. H. Miller,³ I. P. J. Shipsey,³ B. Xin,³ G. S. Adams,⁴ D. Hu,⁴ B. Moziak,⁴ J. Napolitano,⁴ K. M. Ecklund,⁵ Q. He,⁶ J. Insler,⁶ H. Muramatsu,⁶ C. S. Park,⁶ E. H. Thorndike,⁶ F. Yang,⁶ M. Artuso,⁷ S. Blusk,⁷ S. Khalil,⁷ R. Mountain,⁷ K. Randrianarivony,⁷ T. Skwarnicki,⁷ S. Stone,⁷ J. C. Wang,⁷ L. M. Zhang,⁷ G. Bonvicini,⁸ D. Cinabro,⁸ A. Lincoln,⁸ M. J. Smith,⁸ P. Zhou,⁸ J. Zhu,⁸ P. Naik,⁹ J. Rademacker,⁹ D. M. Asner,¹⁰ K. W. Edwards,¹⁰ J. Reed,¹⁰ A. N. Robichaud,¹⁰ G. Tatishvili,¹⁰ E. J. White,¹⁰ R. A. Briere,¹¹ H. Vogel,¹¹ P. U. E. Onyisi,¹² J. L. Rosner,¹² J. P. Alexander,¹³ D. G. Cassel,¹³ R. Ehrlich,¹³ L. Fields,¹³ R. S. Galik,¹³ L. Gibbons,¹³ R. Gray,¹³ S. W. Gray,¹³ D. L. Hartill,¹³ B. K. Heltsley,¹³ D. Hertz,¹³ J. M. Hunt,¹³ J. Kandaswamy,¹³ D. L. Kreinick,¹³ V. E. Kuznetsov,¹³ J. Ledoux,¹³ H. Mahlke-Krüger,¹³ J. R. Patterson,¹³ D. Peterson,¹³ D. Riley,¹³ A. Ryd,¹³ A. J. Sadoff,¹³ X. Shi,¹³ S. Stroiney,¹³ W. M. Sun,¹³ T. Wilksen,¹³ J. Yelton,¹⁴ P. Rubin,¹⁵ N. Lowrey,¹⁶ S. Mehrabyan,¹⁶ M. Selen,¹⁶ J. Wiss,¹⁶ M. Kornicer,¹⁷ R. E. Mitchell,¹⁷ M. R. Shepherd,¹⁷ C. M. Tarbert,¹⁷ D. Besson,¹⁸ T. K. Pedlar,¹⁹ J. Xavier,¹⁹ D. Cronin-Hennessy,²⁰ K. Y. Gao,²⁰ J. Hietala,²⁰ T. Klein,²⁰ R. Poling,²⁰ P. Zweber,²⁰ S. Dobbs,²¹ Z. Metreveli,²¹ K. K. Seth,²¹ B. J. Y. Tan,²¹ and A. Tomaradze²¹

(CLEO Collaboration)

¹University of Oxford, Oxford OX1 3RH, UK
²University of Puerto Rico, Mayaguez, Puerto Rico 00681
³Purdue University, West Lafayette, Indiana 47907, USA
⁴Rensselaer Polytechnic Institute, Troy, New York 12180, USA
⁵Rice University, Houston, Texas 77005, USA
⁶University of Rochester, Rochester, New York 14627, USA
⁷Syracuse University, Syracuse, New York 13244, USA
⁸Wayne State University, Detroit, Michigan 48202, USA
⁹University of Bristol, Bristol BS8 1TL, UK
¹⁰Carleton University, Ottawa, Ontario, Canada K1S 5B6
¹¹Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
¹²University of Chicago, Chicago, Illinois 60637, USA
¹³Cornell University, Ithaca, New York 14853, USA
¹⁴University of Florida, Gainesville, Florida 32611, USA
¹⁵George Mason University, Fairfax, Virginia 22030, USA
¹⁶University of Illinois, Urbana-Champaign, Illinois 61801, USA
¹⁷Indiana University, Bloomington, Indiana 47405, USA
¹⁸University of Kansas, Lawrence, Kansas 66045, USA
¹⁹Luther College, Decorah, Iowa 52101, USA
²⁰University of Minnesota, Minneapolis, Minnesota 55455, USA
²¹Northwestern University, Evanston, Illinois 60208, USA

Using e⁺e^- collision data taken with the CLEO-c detector at the Cornell Electron Storage Ring, we have investigated the direct photon spectrum in the decay psi(2S)-->gammagg. We determine the ratio of the inclusive direct photon decay rate to that of the dominant three-gluon decay rate psi(2S)-->ggg (R_gamma[equivalent]Gamma(gammagg)/Gamma(ggg)) to be R_gamma(z_gamma>0.4)=0.070±0.002±0.019±0.011, with z_gamma defined as the scaled photon energy relative to the beam energy. The errors shown are statistical, systematic, and that due to the uncertainty in the input branching fractions used to extract the ratio, respectively.

©2009 The American Physical Society

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