Forward charge asymmetry in 20-GeV γp reactions

V. R. O'Dell, P. Rankin, G. P. Yost, M. J. Harwin, K. Abe, R. Armenteros, T. C. Bacon, J. Ballam, H. H. Bingham, J. E. Brau, K. Braune, D. Brick, W. M. Bugg, J. M. Butler, W. Cameron, H. O. Cohn, D. C. Colley, G. T. Condo, S. Dado, R. DiamondP. Dingus, P. J. Dornan, R. Erickson, R. C. Field, B. Franek, N. Fujiwara, T. Glanzman, I. M. Godfrey, J. J. Goldberg, A. T. Goshaw, G. Hall, E. R. Hancock, T. Handler, H. J. Hargis, E. L. Hart, K. Hasegawa, R. I. Hulsizer, M. Jobes, T. Kafka, J. F. Kent, G. E. Kalmus, D. P. Kelsey, T. Kitagaki, A. Levy, P. W. Lucas, W. A. Mann, R. Merenyi, R. Milburn, C. Milstene, K. C. Moffeit, A. Napier, S. Noguchi, F. Ochiai, S. O'Nealc, A. P.T. Palounck, I. A. Pless, W. J. Robertson, H. Sagawa, T. Sato, J. Schncps, S. J. Sewell, J. Shank, A. M. Shapiro, K. Takahashi, R. Sugahara, A. Suzuki, K. Tamai, S. Tanaka, S. Tether, D. A. Waide, W. D. Walker, M. Widgoff, C. G. Wilkins, S. Wolbers, C. A. Woods, A. Yarnaguchi, R. K. Yamamoto, S. Yamashita, Y. Yoshimura, H. Yuta

Research output: Contribution to journalArticlepeer-review


Fast forward particles photoproduccd in 20-GeV interactions on a hydrogen target are shown to be preferentially positive, the asymmetry increasing with transverse momentum and Feynman x. Evidence is given that this effect is not due to forward-going target fragments. A model in which production from the photon of a forward-going spectator u is preferred over a u, due to a higher probability for interactions of antiquarks with the proton constituents, is shown to be qualitatively consistent with the data.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalPhysical Review D
Issue number1
StatePublished - 1987


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