Phys. Rev. Lett.
96,
182002
(2006)
[5 pages]
Observation of ψ(3770)→γχc1→γγJ/ψ
T. E. Coan et al. CLEO Collaboration
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T. E. Coan1, Y. S. Gao1, F. Liu1, M. Artuso2, C. Boulahouache2, S. Blusk2, J. Butt2, O. Dorjkhaidav2, J. Li2, N. Menaa2, R. Mountain2, R. Nandakumar2, K. Randrianarivony2, R. Redjimi2, R. Sia2, T. Skwarnicki2, S. Stone2, J. C. Wang2, K. Zhang2, S. E. Csorna3, G. Bonvicini4, D. Cinabro4, M. Dubrovin4, A. Lincoln4, R. A. Briere5, G. P. Chen5, J. Chen5, T. Ferguson5, G. Tatishvili5, H. Vogel5, M. E. Watkins5, J. L. Rosner6, N. E. Adam7, J. P. Alexander7, K. Berkelman7, D. G. Cassel7, V. Crede7, J. E. Duboscq7, K. M. Ecklund7, R. Ehrlich7, L. Fields7, R. S. Galik7, L. Gibbons7, B. Gittelman7, R. Gray7, S. W. Gray7, D. L. Hartill7, B. K. Heltsley7, D. Hertz7, C. D. Jones7, J. Kandaswamy7, D. L. Kreinick7, V. E. Kuznetsov7, H. Mahlke-Krüger7, T. O. Meyer7, P. U. E. Onyisi7, J. R. Patterson7, D. Peterson7, E. A. Phillips7, J. Pivarski7, D. Riley7, A. Ryd7, A. J. Sadoff7, H. Schwarthoff7, X. Shi7, M. R. Shepherd7, S. Stroiney7, W. M. Sun7, D. Urner7, T. Wilksen7, K. M. Weaver7, M. Weinberger7, S. B. Athar8, P. Avery8, L. Breva-Newell8, R. Patel8, V. Potlia8, H. Stoeck8, J. Yelton8, P. Rubin9, C. Cawlfield10, B. I. Eisenstein10, G. D. Gollin10, I. Karliner10, D. Kim10, N. Lowrey10, P. Naik10, C. Sedlack10, M. Selen10, E. J. White10, J. Williams10, J. Wiss10, D. M. Asner11, K. W. Edwards11, D. Besson12, T. K. Pedlar13, D. Cronin-Hennessy14, K. Y. Gao14, D. T. Gong14, J. Hietala14, Y. Kubota14, T. Klein14, B. W. Lang14, S. Z. Li14, R. Poling14, A. W. Scott14, A. Smith14, S. Dobbs15, Z. Metreveli15, K. K. Seth15, A. Tomaradze15, P. Zweber15, J. Ernst16, H. Severini17, S. A. Dytman18, W. Love18, S. Mehrabyan18, J. A. Mueller18, V. Savinov18, Z. Li19, A. Lopez19, H. Mendez19, J. Ramirez19, G. S. Huang20, D. H. Miller20, V. Pavlunin20, B. Sanghi20, I. P. J. Shipsey20, G. S. Adams21, M. Anderson21, J. P. Cummings21, I. Danko21, J. Napolitano21, Q. He22, H. Muramatsu22, C. S. Park22, and E. H. Thorndike22 (CLEO Collaboration)
1Southern Methodist University, Dallas, Texas 75275, USA
2Syracuse University, Syracuse, New York 13244, USA
3Vanderbilt University, Nashville, Tennessee 37235, USA
4Wayne State University, Detroit, Michigan 48202, USA
5Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
6Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
7Cornell University, Ithaca, New York 14853, USA
8University of Florida, Gainesville, Florida 32611, USA
9George Mason University, Fairfax, Virginia 22030, USA
10University of Illinois, Urbana-Champaign, Illinois 61801, USA
11Carleton University, Ottawa, Ontario, Canada K1S 5B6 and the Institute of Particle Physics, Canada
12University of Kansas, Lawrence, Kansas 66045, USA
13Luther College, Decorah, Iowa 52101, USA
14University of Minnesota, Minneapolis, Minnesota 55455, USA
15Northwestern University, Evanston, Illinois 60208, USA
16State University of New York at Albany, Albany, New York 12222, USA
17University of Oklahoma, Norman, Oklahoma 73019, USA
18University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
19University of Puerto Rico, Mayaguez, Puerto Rico 00681
20Purdue University, West Lafayette, Indiana 47907, USA
21Rensselaer Polytechnic Institute, Troy, New York 12180, USA
22University of Rochester, Rochester, New York 14627, USA
Received 21 September 2005; revised 22 February 2006; published 10 May 2006
From e+e- collision data acquired with the CLEO detector at the Cornell Electron Storage Ring, we observe the non-DD̅ decay ψ(3770)→γχc1 with a statistical significance of 6.6 standard deviations, using the two-photon cascades to J/ψ and J/ψ→ℓ+ℓ-. We determine σ(e+e-→ψ(3770))×B(ψ(3770)→γχc1)=(18.0±3.3±2.5) pb and branching fraction B(ψ(3770)→γχc1)=(2.8±0.5±0.4)×10-3. We set 90% C.L. upper limits for the transition to χc2 (χc0): σ×B<5.7 pb (<282 pb) and B<0.9×10-3 (<44×10-3). We also determine Γ(ψ(3770)→γχc1)/Γ(ψ(3770)→π+π-J/ψ)=1.5±0.3±0.3 (>1.0 at 90% C.L.), which bears upon the interpretation of X(3872).
© 2006 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.182002
DOI:
10.1103/PhysRevLett.96.182002
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