Study of η formation in photon-photon collisions

H. Aihara, M. Alston-Garnjost, R. E. Avery, A. Barbaro-Galtieri, A. R. Barker, A. V. Barnes, B. A. Barnett, D. A. Bauer, H. U. Bengtsson, D. L. Bintinger, G. J. Bobbink, T. S. Bolognese, A. D. Bross, C. D. Buchanan, A. Buijs, D. O. Caldwell, A. R. Clark, G. D. Cowan, D. A. Crane, O. I. DahlK. A. Derby, J. J. Eastman, P. H. Eberhard, T. K. Edberg, A. M. Eisner, R. Enomoto, F. C. Erné, T. Fujii, J. W. Gary, W. Gorn, J. M. Hauptman, W. Hofmann, J. E. Huth, J. Hylen, T. Kamae, H. S. Kaye, K. H. Kees, R. W. Kenney, L. T. Kerth, Winston Ko, R. I. Koda, R. R. Kofler, K. K. Kwong, R. L. Lander, W. G.J. Langeveld, J. G. Layter, F. L. Linde, C. S. Lindsey, S. C. Loken, A. Lu, X. Q. Lu, G. R. Lynch, R. J. Madaras, K. Maeshima, B. D. Magnuson, J. N. Marx, G. E. Masek, L. G. Mathis, J. A.J. Matthews, S. J. Maxfield, S. O. Melnikoff, E. S. Miller, W. Moses, R. R. McNeil, P. Nemethy, D. R. Nygren, P. J. Oddone, H. P. Paar, D. A. Park, S. K. Park, D. E. Pellett, M. Pripstein, M. T. Ronan, R. R. Ross, F. R. Rouse, K. A. Schwitkis, J. C. Sens, G. Shapiro, M. D. Shapiro, B. C. Shen, W. E. Slater, J. R. Smith, J. S. Steinman, M. L. Stevenson, D. H. Stork, M. K. Sullivan, M. G. Strauss, T. Takahashi, J. R. Thompson, N. Toge, S. Toutounchi, R. Van Tyen, B. Van Uitert, G. J. Van Dalen, R. F. Van Daalen Wetters, W. Vernon, W. Wagner, E. M. Wang, Y. X. Wang, M. R. Wayne, W. A. Wenzel, J. T. White, M. C.S. Williams, Z. R. Woif, H. Yamamoto, S. J. Yellin, C. Zeitlin, W. M. Zhang

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21 Citations (Scopus)

Abstract

Two-photon formation of the η in the reaction e+e- e+e- η e+e- π+ π- γ has been studied for nearly real and virtual photons at an e +e - center-of-mass energy of 29 GeV. The γγ width of the η is found to be 4.5±0.3(stat.)±0.7(syst.) keV. The measured dependence of this yy width upon the photon four-momentum squared in the range 0-5 GeVJ agrees with predictions both from QCD and from ρ dominance. A spin analysis results in a strong preference for a spin-zero, relative to a spin-two, assignment for the η. No evidence for C-parity violation is founc in this η π+ π- γ decay mode.

Original languageEnglish
Pages (from-to)2650-2654
Number of pages5
JournalPhysical Review D
Volume35
Issue number9
DOIs
Publication statusPublished - 1987

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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