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Photon transitions in ψ(2S) decays to χcJ(1P) and ηc(1S)

S. B. Athar, P. Avery, L. Breva-Newell, R. Patel, V. Potlia, H. Stoeck, and J. Yelton

P. Rubin

C. Cawlfield, B. I. Eisenstein, G. D. Gollin, I. Karliner, D. Kim, N. Lowrey, P. Naik, C. Sedlack, M. Selen et al.

K. W. Edwards

D. Besson

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J. Ernst and A. H. Mahmood

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M. Artuso, C. Boulahouache, S. Blusk, J. Butt, E. Dambasuren, O. Dorjkhaidav, N. Menaa, R. Mountain, H. Muramatsu et al.

S. E. Csorna

G. Bonvicini, D. Cinabro, and M. Dubrovin

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N. E. Adam, J. P. Alexander, K. Berkelman, D. G. Cassel, J. E. Duboscq, K. M. Ecklund, R. Ehrlich, L. Fields, R. S. Galik et al.

  • University of Florida, Gainesville, Florida 32611, USA

  • George Mason University, Fairfax, Virginia 22030, USA

J. J. Thaler, J. Williams, and J. Wiss

  • University of Illinois, Urbana-Champaign, Illinois 61801, USA

  • Carleton University, Ottawa, Ontario, Canada K1S 5B6 and the Institute of Particle Physics, Canada

  • University of Kansas, Lawrence, Kansas 66045, USA

J. Urheim

  • University of Minnesota, Minneapolis, Minnesota 55455, USA

  • Northwestern University, Evanston, Illinois 60208, USA

  • State University of New York at Albany, Albany, New York 12222, USA

  • University of Oklahoma, Norman, Oklahoma 73019, USA

  • University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA

  • University of Puerto Rico, Mayaguez, Puerto Rico 00681

  • Purdue University, West Lafayette, Indiana 47907, USA

  • Rensselaer Polytechnic Institute, Troy, New York 12180, USA

  • University of Rochester, Rochester, New York 14627, USA

  • Southern Methodist University, Dallas, Texas 75275, USA

R. Nandakumar, R. Redjimi, R. Sia, T. Skwarnicki, S. Stone, J. C. Wang, and K. Zhang

  • Syracuse University, Syracuse, New York 13244, USA

  • Vanderbilt University, Nashville, Tennessee 37235, USA

  • Wayne State University, Detroit, Michigan 48202, USA

  • Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA

L. Gibbons, B. Gittelman, R. Gray, S. W. Gray, D. L. Hartill, B. K. Heltsley, D. Hertz, L. Hsu, C. D. Jones, J. Kandaswamy, D. L. Kreinick, V. E. Kuznetsov, H. Mahlke-Krüger, T. O. Meyer, P. U. E. Onyisi, J. R. Patterson, D. Peterson, J. Pivarski, D. Riley, J. L. Rosner*, A. Ryd, A. J. Sadoff, H. Schwarthoff, M. R. Shepherd, W. M. Sun, J. G. Thayer, D. Urner, T. Wilksen, and M. Weinberger

  • Cornell University, Ithaca, New York 14853, USA

  • *On leave of absence from University of Chicago.
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Phys. Rev. D 70, 112002 – Published 16 December, 2004

DOI: https://doi.org/10.1103/PhysRevD.70.112002

Abstract

We have studied the inclusive photon spectrum in ψ(2S) decays using the CLEO III detector. We present the most precise measurements of electric dipole (E1) photon transition rates for ψ(2S)→γχcJ(1P) (J=0,1,2). We also confirm the hindered magnetic dipole (M1) transition, ψ(2S)→γηc(1S). However, the direct M1 transition ψ(2S)→γηc(2S) observed by the Crystal Ball as a narrow peak at a photon energy of 91 MeV is not found in our data.

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Phys. Rev. D 70, 112002– Published 16 December, 2004
  • Received 26 August 2004

© 2004 American Physical Society

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