Measurement of the total hadronic cross section in tagged reactions

H. Aihara, M. Alston-Garnjost, R. E. Avery, A. R. Barker, D. A. Bauer, A. Bay, R. Belcinski, H. H. Bingham, E. D. Bloom, C. D. Buchanan, D. O. Caldwell, H. Y. Chao, S. B. Chun, A. R. Clark, G. D. Cowan, D. A. Crane, O. I. Dahl, M. Daoudi, K. A. Derby, J. J. EastmanP. H. Eberhard, T. K. Edberg, A. M. Eisner, F. C. Erne, K. H. Fairfield, A. Fridman, G. Godfrey, J. M. Hauptman, C. Ho, W. Hofmann, T. Kamae, R. W. Kenney, S. Khacheryan, R. R. Kofler, D. J. Lambert, W. G.J. Langeveld, J. G. Layter, W. T. Lin, F. L. Linde, S. C. Loken, A. Lu, G. R. Lynch, J. E. Lys, R. J. Madaras, B. D. Magnuson, H. Marsiske, G. E. Masek, L. G. Mathis, S. J. Maxfield, R. R. McNeil, E. S. Miller, N. A. Nicol, D. R. Nygren, P. J. Oddone, H. Oh, Y. T. Oyang, H. P. Paar, A. P.T. Palounek, 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, B. C. Shen, J. R. Smith, J. S. Steinman, R. W. Stephens, M. L. Stevenson, D. H. Stork, M. G. Strauss, M. K. Sullivan, T. Takahashi, S. Toutounchi, G. J. Vandalen, R. Van Tyen, W. Vernon, W. Wagner, E. M. Wang, Y. X. Wang, W. A. Wenzel, Z. R. Wolf, H. Yamamoto, S. J. Yellin, G. P. Yost, G. Zapalac, C. Zeitlin

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43 Citations (Scopus)


We present a measurement of the total cross section for hadrons, with one photon quasireal and the other a spacelike photon of mass squared -Q2. Results are presented as a function of Q2 and the center-of-mass energy W, with the Q2 range extending from 0.2 to 60 GeV2, and W in the range from 2 to 10 GeV. The data were taken with the TPC/Two-Gamma facility at the SLAC e+e- storage ring PEP, which was operated at a beam energy of 14.5 GeV. The cross section exhibits a gentle falloff with increasing W. Its Q2 dependence is shown to be well described by an incoherent sum of vector-meson and pointlike scattering over most of the observed W range. Agreement at high Q2 is improved if a minimum-pT cutoff (motivated by QCD) is imposed on the pointlike contribution.

Original languageEnglish
Pages (from-to)2667-2674
Number of pages8
JournalPhysical Review D
Issue number9
Publication statusPublished - 1990

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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