Start Over

Production of thef0(1270) meson in photon-photon collisions

Authors :: Behrend, H. J.
Fenner, H.
Schachter, M. J.
Schröder, V.
Sindt, H.
Achterberg, O.
d'Agostini, G.
Apel, W. D.
Engler, J.
Flügge, G.
Forstbauer, B.
Fries, D. C.
Fues, W.
Gamerdinger, K.
Henkes, Th.
Hopp, G.
Krüger, M.
Müller, H.
Randoll, H.
Schmidt, G.
Schneider, H.
de Boer, W.
Buschhorn, G.
Grindhammer, G.
Grosse-Wiesmann, P.
Gunderson, B.
Kiesling, C.
Kotthaus, R.
Kruse, U.
Lierl, H.
Lüers, D.
Oberlack, H.
Schacht, P.
Snyder, A.
Wiedenmann, W.
Bonneaud, G.
Colas, P.
Cordier, A.
Davier, M.
Fournier, D.
Grivaz, J. F.
Haissinski, J.
Journé, V.
Laplanche, F.
Le Diberder, F.
Mallik, U.
Ros, E.
Veillet, J. J.
Field, J. H.
George, R.
Goldberg, M.
Grossetête, B.
Hamon, O.
Kapusta, F.
Kovacs, F.
London, G.
Pain, R.
Poggioli, L.
Rivoal, M.
Aleksan, R.
Bouchez, J.
Carnesecchi, G.
Cozzika, G.
Ducros, Y.
Gaidot, A.
Jarry, P.
Lavagne, Y.
Pamela, J.
Pansart, J. P.
Pierre, F.
Source :: Zeitschrift für Physik C Particles and Fields; September 1984, Vol. 23 Issue: 3 p223-232, 10p
Publication Year :: 1984
Abstract: The production of thef<subscript>0</subscript> in two photon collisions, with the subsequent decayf<subscript>0</subscript>?p<superscript>+</superscript>p<superscript>-</superscript> has been observed in the CELLO detector at PETRA. Thef<subscript>0</subscript> peak was found to lie on a dipion continuum and to be shifted downwards in mass by ?50 MeV/c<superscript>2</superscript>. The pp mass spectrum from 0.8 to 1.5 GeV/c<superscript>2</superscript> was well fitted by the model of Mennessier using only a unitarised Born amplitude and helicity 2f<subscript>0</subscript> amplitude. The previously observed mass shift and distortion of thef<subscript>0</subscript> peak are explained by strong interference between the Born andf<subscript>0</subscript> amplitudes. The only free parameter in the fit of the data to the model is the radiative widthG<subscript>??</subscript>(f<subscript>0</subscript>). It was found that:G<subscript>??</subscript>(f<subscript>0</subscript>)=2.5±0.1±0.5 keV where the first (second) quoted errors are statistical (systematic).