Charmonium production in photon-photon collisions

We have searched for the two-photon production of the eta/sub c/, chi/sub 0/, and chi/sub 2/ charmonium states at the SLAC e/sup +/e/sup -/ collider PEP in the channels ..gamma gamma -->..K/sup +- /K/sub S//sup 0/..pi../sup minus-or-plus/, ..gamma gamma -->..K/sup +/K/sup -/..pi../sup +/..pi.....

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Veröffentlicht in:	Phys. Rev. Lett.; (United States) 1988-06, Vol.60 (23), p.2355-2358
Hauptverfasser:	Aihara, H, Alston-Garnjost, M, Avery, RE, Barbaro-Galtieri, A, Barker, AR, Barnett, BA, Bauer, DA, Bay, A, Bengtsson, H, Bobbink, GJ, Buchanan, CD, Buijs, A, Caldwell, DO, Chao, H, Chun, S, Clark, AR, Cowan, GD, Crane, DA, Dahl, OI, Daoudi, M, Derby, KA, Eastman, JJ, Eberhard, PH, Edberg, TK, Eisner, AM, Enomoto, R, Erné, FC, Fairfield, KH, Hauptman, JM, Hofmann, W, Hylen, J, Kamae, T, Kaye, HS, Kenney, RW, Khacheryan, S, Kofler, RR, Langeveld, WG, Layter, JG, Lin, WT, Linde, FL, Loken, SC, Lu, A, Lynch, GR, Madaras, RJ, Magnuson, BD, Masek, GE, Mathis, LG, Matthews, JA, Maxfield, SJ, Miller, ES, Moses, W, Nygren, DR, Oddone, PJ, Paar, HP, Park, SK, Pellett, DE, Pripstein, M, Ronan, MT, Ross, RR, Rouse, FR, Schwitkis, KA, Sens, JC, Shapiro, G, Shen, BC
Format:	Artikel
Sprache:	eng
Schlagworte:	BASIC INTERACTIONS BOSONS BRANCHING RATIO CHARMONIUM CHI0-3415 MESONS CHI2-3555 MESONS DATA ELECTROMAGNETIC INTERACTIONS ELECTRON-POSITRON INTERACTIONS ELEMENTARY PARTICLES ETA C-2980 MESONS EXPERIMENTAL DATA HADRONS INFORMATION INTERACTIONS KAONS KAONS MINUS KAONS PLUS LEPTON-LEPTON INTERACTIONS LIMITING VALUES MASS SPECTRA MESONS NUMERICAL DATA PARTICLE INTERACTIONS PARTICLE PRODUCTION PARTICLE PROPERTIES PARTICLE WIDTHS PHI-1020 MESONS PHOTON-PHOTON INTERACTIONS PHYSICS OF ELEMENTARY PARTICLES AND FIELDS PIONS PIONS MINUS PIONS PLUS PSEUDOSCALAR MESONS QUARKONIUM SCALAR MESONS SPECTRA STRANGE MESONS STRANGE PARTICLES STRANGEONIUM TENSOR MESONS VECTOR MESONS 645101 > High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
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Zusammenfassung:	We have searched for the two-photon production of the eta/sub c/, chi/sub 0/, and chi/sub 2/ charmonium states at the SLAC e/sup +/e/sup -/ collider PEP in the channels ..gamma gamma -->..K/sup +- /K/sub S//sup 0/..pi../sup minus-or-plus/, ..gamma gamma -->..K/sup +/K/sup -/..pi../sup +/..pi../sup -/, ..gamma gamma --> pi../sup +/..pi../sup -/..pi../sup +/..pi../sup -/, and ..gamma gamma -->..K/sup +/K/sup -/K/sup +/K/sup -/. We identify four eta/sub c/ candidates in the K/sup +/K/sup -/K/sup +/K/sup -/ channel on a negligible background; the one phiphi event among them implies a 95%-confidence-level lower limit for GAMMA/sub ..gamma..//sub ..gamma../(eta/sub c/) of 1.7 keV. In the other channels we find no evidence for any of the three states. We establish 95%-C.L. upper limits GAMMA/sub ..gamma..//sub ..gamma../(eta/sub c/)
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.60.2355