Charmonium Spectroscopy from Inclusive psi-prime and J/psi Radiative Decays

Results from a detailed study using the Crystal Ball detector at the SLAC e+e− storage ring SPEAR of the inclusive photon spectra from 1.8×106 ψ’ and 2.2×106 J/ψ decays are presented. Radiative transitions from the ψ’ to the χ2,1,0 states are observed with photon energies of 126.0±0.2±4, 169.6±0.3±4...

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Hauptverfasser:	Gaiser, J., Bloom, Elliott D., Bulos, F., Godfrey, G., Kiesling, Christian M., Lockman, William S., Oreglia, M., Scharre, D. L., Edwards, C., Partridge, Richard, Peck, C., Porter, F., Antreasyan, D., Gu, Y. F., Irion, J., Kollmann, W. S., Strauch, K., Wacker, K., Weinstein, A., Aschman, D., Burnett, T., Cavalli-Sforza, M., Coyne, D. G., Newman-Holmes, C. B., Sadrozinski, H. F. W., Gelphman, D., Hofstadter, R., Horisberger, R., Kirkbride, I., Kolanoski, H., Konigsmann, Kay, Lee, Roger A., Liberman, A., O'Reilly, J., Osterheld, A., Pollock, B., Tompkins, J.
Format:	Report
Sprache:	eng
Schlagworte:	(PHOTON): ENERGY SPECTRUM 1: 3.7 GEV-CMS ANNIHILATION: ELECTRON POSITRON CHARMONIUM CHI: WIDTH COLLIDING BEAMS: ELECTRON POSITRON Crystal Ball ELECTRON POSITRON: ANNIHILATION ELECTRON POSITRON: COLLIDING BEAMS ELECTROPRODUCTION: J/PSI ELECTROPRODUCTION: PSI ENERGY SPECTRUM: (PHOTON) ETA/C: WIDTH EXPERIMENTAL RESULTS J/PSI: ELECTROPRODUCTION PSI > > CHI MESONS PHOTON PSI MESONS > > ETA/C PHOTON PSI MESONS: BRANCHING RATIO PSI MESONS: RADIATIVE DECAY PSI: ELECTROPRODUCTION RADIATIVE DECAY: PSI MESONS SLAC SPEAR STOR
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Zusammenfassung:	Results from a detailed study using the Crystal Ball detector at the SLAC e+e− storage ring SPEAR of the inclusive photon spectra from 1.8×106 ψ’ and 2.2×106 J/ψ decays are presented. Radiative transitions from the ψ’ to the χ2,1,0 states are observed with photon energies of 126.0±0.2±4, 169.6±0.3±4, and 258.4±0.4±4 MeV and branching ratios B(ψ’→γχ2,1,0) =(8.0±0.5±0.7)%, (9.0±0.5±0.7)%, and (9.9±0.5±0.8)%, respectively. Values for the natural linewidths of the χ states are obtained: Γ(χ2,1,0)=0.8–4.9,
ISSN:	1550-7998 2470-0029 0556-2821 2470-0010 1089-4918 1550-2368
DOI:	10.3204/pubdb-2017-11225