Phys. Rev. Lett.
101,
182003
(2008)
[6 pages]
Precision Measurement of the Mass of the hc(1P1) State of Charmonium
S. Dobbs et al. CLEO Collaboration
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S. Dobbs1, Z. Metreveli1, K. K. Seth1, A. Tomaradze1, J. Libby2, A. Powell2, G. Wilkinson2, K. M. Ecklund3, W. Love4, V. Savinov4, A. Lopez5, H. Mendez5, J. Ramirez5, J. Y. Ge6, D. H. Miller6, I. P. J. Shipsey6, B. Xin6, G. S. Adams7, M. Anderson7, J. P. Cummings7, I. Danko7, D. Hu7, B. Moziak7, J. Napolitano7, Q. He8, J. Insler8, H. Muramatsu8, C. S. Park8, E. H. Thorndike8, F. Yang8, M. Artuso9, S. Blusk9, S. Khalil9, J. Li9, R. Mountain9, S. Nisar9, K. Randrianarivony9, N. Sultana9, T. Skwarnicki9, S. Stone9, J. C. Wang9, L. M. Zhang9, G. Bonvicini10, D. Cinabro10, M. Dubrovin10, A. Lincoln10, P. Naik11, J. Rademacker11, D. M. Asner12, K. W. Edwards12, J. Reed12, R. A. Briere13, T. Ferguson13, G. Tatishvili13, H. Vogel13, M. E. Watkins13, J. L. Rosner14, J. P. Alexander15, D. G. Cassel15, J. E. Duboscq15, R. Ehrlich15, L. Fields15, R. S. Galik15, L. Gibbons15, R. Gray15, S. W. Gray15, D. L. Hartill15, B. K. Heltsley15, D. Hertz15, J. M. Hunt15, J. Kandaswamy15, D. L. Kreinick15, V. E. Kuznetsov15, J. Ledoux15, H. Mahlke-Krüger15, D. Mohapatra15, P. U. E. Onyisi15, J. R. Patterson15, D. Peterson15, D. Riley15, A. Ryd15, A. J. Sadoff15, X. Shi15, S. Stroiney15, W. M. Sun15, T. Wilksen15, S. B. Athar16, R. Patel16, J. Yelton16, P. Rubin17, B. I. Eisenstein18, I. Karliner18, S. Mehrabyan18, N. Lowrey18, M. Selen18, E. J. White18, J. Wiss18, R. E. Mitchell19, M. R. Shepherd19, D. Besson20, T. K. Pedlar21, D. Cronin-Hennessy22, K. Y. Gao22, J. Hietala22, Y. Kubota22, T. Klein22, B. W. Lang22, R. Poling22, A. W. Scott22, 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
Received 28 May 2008; published 31 October 2008
A precision measurement of the mass of the hc(1P1) state of charmonium has been made using a sample of 24.5×106 ψ(2S) events produced in e+e- annihilation at the Cornell Electron Storage Ring (CESR). The reaction used was ψ(2S)→π0hc, π0→γγ, hc→γηc, 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 ηc 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(hc)=3525.28± 0.19(stat.)±0.12(syst.) MeV, and B(ψ(2S)→π0hc)×B(hc→γηc)=(4.19±0.32±0.45)×10-4. Using the 3PJ centroid mass, ΔMhf(1P)≡⟨M(χcJ)⟩-M(hc)=+0.02±0.19±0.13 MeV.
© 2008 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.182003
DOI:
10.1103/PhysRevLett.101.182003
PACS:
14.40.Gx, 12.38.Qk, 13.25.Gv
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