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Observation of Three P States in the Radiative Decay of ϒ(2S)

R. Nernst, D. Antreasyan, D. Aschman, D. Besset, J. K. Bienlein, E. D. Bloom, I. Brock, R. Cabenda, A. Cartacci et al.

M. Cavalli-Sforza, R. Clare, G. Conforto, S. Cooper, R. Cowan, D. Coyne, D. de Judicibus, C. Edwards, A. Engler, G. Folger, A. Fridman*, J. Gaiser, D. Gelphman, G. Godfrey, F. H. Heimlich, R. Hofstadter, J. Irion, Z. Jakubowski, S. Keh, H. Kilian, I. Kirkbride, T. Kloiber, W. Koch, A. C. König, K. Königsmann, R. W. Kraemer, R. Lee, S. Leffler, R. Lekebusch, P. Lezoch, A. M. Litke†, W. Lockman, S. Lowe, B. Lurz, D. Marlow, W. Maschmann, T. Matsui, F. Messing, W. J. Metzger, B. Monteleoni, C. Newman-Holmes, B. Niczyporuk, G. Nowak, C. Peck, P. G. Pelfer, B. Pollock, F. C. Porter, D. Prindle, P. Ratoff, B. Renger, C. Rippich, M. Scheer, P. Schmitt, M. Schmitz, J. Schotanus, A. Schwarz, D. Sievers, T. Skwarnicki, K. Strauch, U. Strohbusch, J. Tompkins, H. -J. Trost, R. T. Van de Walle, U. Volland, K. Wacker, W. Walk, H. Wegener, D. Williams, and P. Zschorsch

  • California Institute of Technology, Pasadena, California 91125 University of Cape Town, Cape Town, South Africa Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213 Cracow Institute of Nuclear Physics, Cracow, Poland Deutsches Elektronen Synchrotron DESY, Hamburg, Germany Universität Erlangen-Nürnberg, Erlangen, Germany Instituto Nazionale di Fisica Nucleare and University of Firenze, Italy Universität Hamburg, I. Institut für Experimentalphysik, Hamburg, Germany Harvard University, Cambridge, Massachusetts 02138 University of Nijmegen and Nationaal Instituut voor Kernfysica en Hoge-Energiefysica, Nijmegen, The Netherlands Princeton University, Princeton, New Jersey 08544 Department of Physics, High-Energy Physics Laboratory, and Stanford Linear Accelerator Center, Stanford, California 94305 Universität Wüzrburg, Würzburg, Germany

  • *Permanent address: Département de Physique de Particules Elémentaires, Centre d'Etudes Nucléaires de Saclay, Gif-sur-Yvette, France.
  • †Present address: Institute for Particle Physics, University of California, Santa Cruz, Calif. 95064.
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Phys. Rev. Lett. 54, 2195 – Published 20 May, 1985

DOI: https://doi.org/10.1103/PhysRevLett.54.2195

Abstract

The inclusive photon spectrum in hadronic decays of the ϒ(2S) is measured with the Crystal Ball detector at DORIS II. Four well separated photon lines, which are consistent with the decay hypothesis ϒ(2S)→γ+P2,1,03 and P2,13→γϒ(1S), are observed. The energies of the lines from the primary transitions are Eγ1=110.4±0.8±2.2 MeV, Eγ2=130.6±0.8±2.4 MeV, and Eγ3=163.8±1.6±2.7 MeV; the branching fractions are (5.8±0.7±1.0)%, (6.5±0.7±1.2)%, and (3.6±0.8±0.9)%, respectively. The secondary transitions center at 〈Eγ〉≃430 MeV with a combined branching fraction of (3.6±0.7±0.5)%.

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References (17)

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Phys. Rev. Lett. 54, 2195– Published 20 May, 1985
  • Received 11 March 1985

© 1985 American Physical Society

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