Study ofη’formation in photon-photon collisions

Study ofη’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. Dahl,K. 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. G. Strauss,M. K. Sullivan,T. Takahashi,J. R. Thompson,N. Toge,S. Toutounchi,R. van Tyen,B. van Uitert,G. J. VanDalen,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. Wolf,H. Yamamoto,S. J. Yellin,C. Zeitlin,W-M. Zhang;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. Dahl;K. 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. G. Strauss;M. K. Sullivan;T. Takahashi;J. R. Thompson;N. Toge;S. Toutounchi;R. van Tyen;B. van Uitert;G. J. VanDalen;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. Wolf;H. Yamamoto;S. J. Yellin;C. Zeitlin;W-M. Zhang;
physical review d 1987 Vol. 35 pp. 2650-2654
227
zhang1987physicalstudy

Abstract

Two-photon formation of the η’ in the reaction e+ e−→e+ e−ηm’→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 γγ width upon the photon four-momentum squared in the range 0–5 GeV2 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 found in this η’→π+ π−γ decay mode.

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