Study of χc2 production in photon-photon collisions
1993; Elsevier BV; Volume: 302; Issue: 2-3 Linguagem: Inglês
10.1016/0370-2693(93)90407-9
ISSN1873-2445
AutoresD. Bauer, R. Belcinski, R. C. Berg, H. H. Bingham, C. D. Buchanan, D. O. Caldwell, S-B. Chun, A. R. Clark, O. I. Dahl, M. Daoudi, J. J. Eastman, A. M. Eisner, K. Fairfield, G. Godfrey, G. S. Greenbaum, J. M. Hauptman, W. Hofmann, R. Holtzapple, S. Khacheryan, K.T. Knöpfle, R. Kofler, D. J. Lambert, J. G. Layter, W.T. Lin, S. Loken, A. Lu, G. Lynch, J. E. Lys, R. J. Madaras, H. Marsiske, G. Masek, E. S. Miller, N.A. Nicol, D. R. Nygren, Y.-T. Oyang, H. P. Paar, A. P. T. Palounek, D. E. Pellet, M. T. Ronan, R. R. Ross, G. Shapiro, B. C. Shen, R. W. Stephens, M. L. Stevenson, M. Strauss, M. K. Sullivan, W. Vernon, E. M. Wang, Y.X. Wang, W.A. Wenzel, H. Yamamoto, S. Yellin, G.P. Yost, G. Zapalac, C. Zeitlin,
Tópico(s)High-Energy Particle Collisions Research
ResumoTwo-photon production of the charmonium state χc has been studied by the TPC/Two-Gamma experiment at the SLAC e+e− collider PEP. We observe evidence of the χc2 state in the channel γγ→χc2, χc2→γJ/ψ, J/ψ→l+l− and obtain a value of Γγγ(χc2)=3.4±1.7±0.9 keV. This is the first observation of the two-photon production of a χc state. Comparison is made with previous experimental results and QCD predictions for Γγγ(χc2).
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