Two-photon production of final states with ap $$\bar p$$ pair

Autor: T. Ruf, R. C. Fernholz, V. Lubimov, W. Schmidt-Parzefall, G. Schweda, R. Ammar, C. W. Darden, M. Reidenbach, J. Spengler, M. Danilov, D. Wegener, J. C. Gabriel, P. M. Patel, G. Kernel, V. Tchistilin, V. Shevchenko, G. Herrera, B. Fominykh, K. W. McLean, K. W. Edwards, H. I. Cronström, K. Strahl, V. Soloshenko, K. R. Schubert, H. Wegener, J. D. Swain, A. Semenov, J. D. Prentice, C. E. K. Charlesworth, A. W. Nilsson, Stefan Schael, J. A. Parsons, Rainer Mankel, H. Kapitza, Robert K. Kutschke, A. Drescher, P. Böckmann, A. Walther, Yu. Zaitsev, Raymond Davis, D. Kamp, Anton Babaev, B. Spaan, W. Funk, R. S. Orr, S. Werner, T. S. Yoon, B. Boštjančič, N. Kwak, C. Hast, D. Coppage, P. Križan, S. Ball, I. Tichomirov, H. Schröder, U. Volland, Wr Frisken, R. Waldi, Georgios Tsipolitis, A. Golutvin, D. B. MacFarlane, I. V. Gorelov, R. Childers, F. Sefkow, A. Rostovtsev, H. Scheck, A. Krüger, S. Semenov, A. Lindner, M. Pleško, G. Harder, R. D. Appuhn, R. Gläser, H. Albrecht, M. Schäfer, R. Wurth, J. Stiewe, E. Križnič, A. Nippe, Sally Seidel, Holger Schulz, S. Kanekal, Hermann Kolanoski, Leif J. Jönsson
Rok vydání: 1989
Předmět:
Zdroj: Zeitschrift für Physik C Particles and Fields. 42:543-548
ISSN: 1434-6052
0170-9739
Popis: Two-photon production of the exclusive final statesp\(\bar p\)+nπ (n=0, 1, 2, and 3) has been investigated using the ARGUS detector at thee+e− storage ring DORIS II at DESY. The reactionsγγ→p\(\bar p\)π andγγ→p\(\bar p\)π+π−π0 have been observed for the first time, as have theΔ++ and\(\overline {\Delta ^{ + + } } \) baryons in the final statep\(\bar p\)π+π−. No evidence was found forΔ++\(\overline {\Delta ^{ + + } } \) production. Topological cross sections for two-photon production ofp\(\bar p\),p\(\bar p\)π0,p\(\bar p\)π+π− andp\(\bar p\)π+π−π0, as well as the crosssection forγγ→Δ++\(\bar p\)π+π−+c.c., have been measured. Upper limits are given for the cross section forγγ→Δ0\(\overline {\Delta ^0 } \),γγ→Δ++\(\overline {\Delta ^{ + + } } \) andγγ→Λ\(\bar \Lambda \).
Databáze: OpenAIRE
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