APS » Phys. Rev. Lett. » Volume 101 » Issue 18

S. Dobbs,¹ Z. Metreveli,¹ K. K. Seth,¹ A. Tomaradze,¹ J. Libby,² A. Powell,² G. Wilkinson,² K. M. Ecklund,³ W. Love,⁴ V. Savinov,⁴ A. Lopez,⁵ H. Mendez,⁵ J. Ramirez,⁵ J. Y. Ge,⁶ D. H. Miller,⁶ I. P. J. Shipsey,⁶ B. Xin,⁶ G. S. Adams,⁷ M. Anderson,⁷ J. P. Cummings,⁷ I. Danko,⁷ D. Hu,⁷ B. Moziak,⁷ J. Napolitano,⁷ Q. He,⁸ J. Insler,⁸ H. Muramatsu,⁸ C. S. Park,⁸ E. H. Thorndike,⁸ F. Yang,⁸ M. Artuso,⁹ S. Blusk,⁹ S. Khalil,⁹ J. Li,⁹ R. Mountain,⁹ S. Nisar,⁹ K. Randrianarivony,⁹ N. Sultana,⁹ T. Skwarnicki,⁹ S. Stone,⁹ J. C. Wang,⁹ L. M. Zhang,⁹ G. Bonvicini,¹⁰ D. Cinabro,¹⁰ M. Dubrovin,¹⁰ A. Lincoln,¹⁰ P. Naik,¹¹ J. Rademacker,¹¹ D. M. Asner,¹² K. W. Edwards,¹² J. Reed,¹² R. A. Briere,¹³ T. Ferguson,¹³ G. Tatishvili,¹³ H. Vogel,¹³ M. E. Watkins,¹³ J. L. Rosner,¹⁴ J. P. Alexander,¹⁵ D. G. Cassel,¹⁵ J. E. Duboscq,¹⁵ R. Ehrlich,¹⁵ L. Fields,¹⁵ R. S. Galik,¹⁵ L. Gibbons,¹⁵ R. Gray,¹⁵ S. W. Gray,¹⁵ D. L. Hartill,¹⁵ B. K. Heltsley,¹⁵ D. Hertz,¹⁵ J. M. Hunt,¹⁵ J. Kandaswamy,¹⁵ D. L. Kreinick,¹⁵ V. E. Kuznetsov,¹⁵ J. Ledoux,¹⁵ H. Mahlke-Krüger,¹⁵ D. Mohapatra,¹⁵ P. U. E. Onyisi,¹⁵ J. R. Patterson,¹⁵ D. Peterson,¹⁵ D. Riley,¹⁵ A. Ryd,¹⁵ A. J. Sadoff,¹⁵ X. Shi,¹⁵ S. Stroiney,¹⁵ W. M. Sun,¹⁵ T. Wilksen,¹⁵ S. B. Athar,¹⁶ R. Patel,¹⁶ J. Yelton,¹⁶ P. Rubin,¹⁷ B. I. Eisenstein,¹⁸ I. Karliner,¹⁸ S. Mehrabyan,¹⁸ N. Lowrey,¹⁸ M. Selen,¹⁸ E. J. White,¹⁸ J. Wiss,¹⁸ R. E. Mitchell,¹⁹ M. R. Shepherd,¹⁹ D. Besson,²⁰ T. K. Pedlar,²¹ D. Cronin-Hennessy,²² K. Y. Gao,²² J. Hietala,²² Y. Kubota,²² T. Klein,²² B. W. Lang,²² R. Poling,²² A. W. Scott,²² and P. Zweber²²

(CLEO Collaboration)

¹Northwestern University, Evanston, Illinois 60208, USA
²University of Oxford, Oxford OX1 3RH, United Kingdom
³State University of New York at Buffalo, Buffalo, New York 14260, USA
⁴University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
⁵University of Puerto Rico, Mayaguez, Puerto Rico 00681
⁶Purdue University, West Lafayette, Indiana 47907, USA
⁷Rensselaer Polytechnic Institute, Troy, New York 12180, USA
⁸University of Rochester, Rochester, New York 14627, USA
⁹Syracuse University, Syracuse, New York 13244, USA
¹⁰Wayne State University, Detroit, Michigan 48202, USA
¹¹University of Bristol, Bristol BS8 1TL, United Kingdom
¹²Carleton University, Ottawa, Ontario, K1S 5B6, Canada
¹³Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
¹⁴Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
¹⁵Cornell University, Ithaca, New York 14853, USA
¹⁶University of Florida, Gainesville, Florida 32611, USA
¹⁷George Mason University, Fairfax, Virginia 22030, USA
¹⁸University of Illinois, Urbana-Champaign, Illinois 61801, USA
¹⁹Indiana University, Bloomington, Indiana 47405, USA
²⁰University of Kansas, Lawrence, Kansas 66045, USA
²¹Luther College, Decorah, Iowa 52101, USA
²²University of Minnesota, Minneapolis, Minnesota 55455, USA

A precision measurement of the mass of the h_c(¹P₁) state of charmonium has been made using a sample of 24.5×10⁶ (2S) events produced in e⁺e^- annihilation at the Cornell Electron Storage Ring (CESR). The reaction used was (2S)⁰h_c, ⁰, h_cc, and the reaction products were detected in the CLEO-c detector. Data have been analyzed both for the inclusive reaction and for the exclusive reactions in which _c decays are reconstructed in 15 hadronic decay channels. Consistent results are obtained in the two analyses. The averaged results of the present measurements are M(h_c)=3525.28±  0.19(stat.)±0.12(syst.) MeV, and ((2S)⁰h_c)×(h_cc)=(4.19±0.32±0.45)×10^-4. Using the ³P_J centroid mass, M_hf(1P)M(_cJ)-M(h_c)=+0.02±0.19±0.13 MeV.

©2008 The American Physical Society

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