Exclusive proton-antiproton production in two-photon collisions

• Published in: Physics letters. B Vol. 108; no. 1; pp. 67 - 70
• Main Authors: Brandelik, R., Braunschweig, W., Gather, K., Kirschfink, F.J., Lübelsmeyer, K., Martyn, H.-U., Peise, G., Rimkus, J., Sander, H.G., Schmitz, D., von Dratzig, A.Schultz, Trines, D., Wallraff, W., Boerner, H., Fischer, H.M., Hartmann, H., Hilger, E., Hillen, W., Knop, G., Köpke, L., Kolanoski, H., Leu, P., Wedemeyer, R., Wermes, N., Wollstadt, M., Burkhardt, H., Cooper, S., Heyland, D., Hultschig, H., Joos, P., Koch, W., Kötz, U., Kowalski, H., Ladage, A., Lüke, D., Lynch, H.L., Mättig, P., Mess, K.H., Notz, D., Pyrlik, J., Quarrie, D.R., Riethmüller, R., Shapira, A., Söding, P., Wiik, B.H., Wolf, G., Fohrmann, R., Holder, M., Krasemann, H.L., Poelz, G., Römer, O., Schmüser, P., Al-Agil, I., Beuselinck, R., Binnie, D.M., Campbell, A.J., Dornan, P.J., Garbutt, D.A., Jones, T.D., Jones, W.G., Lloyd, S.L., Pandoulas, D., Sedgebeer, J.K., Stern, R.A., Yarker, S., Bowler, M.G., Brock, I.C., Cashmore, R.J., Devenish, R., Grossmann, P., Illingworth, J., Ogg, M., Salmon, G.L., Thomas, J., Wyatt, T.R., Youngman, C., Bell, K.W., Foster, B., Hart, J.C., Proudfoot, J., Saxon, D.H., Woodworth, P.L., Duchovni, E., Eisenberg, Y., Karshon, U., Mikenberg, G., Revel, D., Ronat, E., Barklow, T., Freeman, J., Meyer, T., Rudolph, G., Wicklund, E., Wu, S.L., Zobernig, G.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 1982
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(82)91144-3

Production of proton-antiproton pairs by two-photon scattering has been observed at the electron-position storage ring PETRA. A total of eight proton-antiproton pairs have been identified using the time-of-flight technique. We have measured a total cross section of 4.5 ± 0.8 nb in the photon-photon c.m. energy range 2.0–2.6 GeV.