Evidence for hard scattering of hadronic constituents of photons in photon-photon collisions of TRISTAN

• DOI: 10.1016/0370-2693(92)90982-a
• Publication Date: 2002-11-12T11:13:41Z
• Authors: R. Tanaka; T. Kojima; T. Sasaki; K. Tomioka; S. Matsumoto; Y. Oshi; K. Miyano; H. Miyata; P. Kirk; J. Lim; R.R. McNeil; S.S. Myung; C.P. Cheng; W.X. Gao; P. Gu; W.G. Yan; M.H. Ye; A. Abashian; K. Gotow; K.P. Hu; A.Z. Lai; E.H. Low; M.E. Mattson; L. Piilonen; K.L. Sterner; S. Lusin; C. Rosenfeld; A.T.M. Wang; S. Wilson; M. Frautschi; H. Kagan; R. Kass; C.A. Fry; R.E. Breedon; Winston Ko; R.L. Lander; K. Maeshima; R.L. Malchow; J. Rowe; J.R. Smith; D. Stuart; K. Abe; Y. Fujii; Y. Higashi; Y. Kurihara; A. Maki; T. Nozaki; T. Omori; H. Sagawa; Y. Sakai; Y. Sugimoto; Y. Takaiwa; S. Terada; R. Walker; D. Blanis; A. Bodek; S. Kanda; B.J. Kim; Y.K. Kim; T. Kumita; Y.K. Li; S.L. Olsen; A. Sill; K. Ueno; C. Velisarris; F. Kajino; R. Poling; T. Thomas; Y. Yamashita; A. Bacala,; S.K. Kim; F. Sannes; S. Schnetzer; R. Stone; J. Vinson; E. Araki; S. Kobayashi; A. Murakami; H. Yoshinaka; J.S. Kang; M.H. Lee; S.K. Choi; D. Son; T. Ishizuka
• Keywords: 0103 physical sciences; 01 natural sciences; 7. Clean energy

Abstract We present results of an experimental study of e+e−+ hadrons in the kinematic regime for which the process is interpreted as hadron production in collisions of almost-real photons. The data sample corresponds to an integrated luminosity of 27.5 pb− and covers center-of-mass energies from 55 to 61.4 GeV. We observe more events than expected from the incoherent sum of quark-parton and vector-meson-dominance models, and we give a quantitative explanation of the excess by including the hard scattering of the hadronic constituents of the photons calculated with QCD.