We report the first observation of the (radiative) decay J/psi-->e(+)e(-)gamma. Our data are from an experiment in which J/psi is formed in antiproton-proton annihilations. The observed rate is consistent with a QED calculation based on final state radiation. Our measurement gives a branching ratio for this mode of (8.8 +/- 1.3 +/- 0.4) x 10(-3) for gamma energy > 100 MeV.

Observation of the radiative decay J/psi->e(+)e(-)gamma

CALABRESE, Roberto;DALPIAZ, Pietro;FERRETTI, Paola;LUPPI, Eleonora;PETRUCCI, Ferruccio Carlo;SAVRIE', Mauro;
1996

Abstract

We report the first observation of the (radiative) decay J/psi-->e(+)e(-)gamma. Our data are from an experiment in which J/psi is formed in antiproton-proton annihilations. The observed rate is consistent with a QED calculation based on final state radiation. Our measurement gives a branching ratio for this mode of (8.8 +/- 1.3 +/- 0.4) x 10(-3) for gamma energy > 100 MeV.
1996
Armstrong, Ta; Bettoni, D; Bharadwaj, V; Biino, C; Borreani, G; Broemmelsiek, D; Buzzo, A; Calabrese, Roberto; Ceccucci, A; Cester, R; Church, M; Dalpiaz, Pietro; Ferretti, Paola; Dimitroyannis, D; Fabbri, M; Fast, J; Gianoli, A; Ginsburg, Cm; Gollwitzer, K; Govi, G; Hahn, A; Hasan, M; Hsueh, S; Lewis, R; Luppi, Eleonora; Macri, M; Majewska, Am; Mandelkern, M; Marchetto, F; Marinelli, M; Marques, J; Marsh, W; Martini, M; Masuzawa, M; Menichetti, E; Migliori, A; Mussa, R; Palestini, S; Pallavicini, M; Passaggio, S; Pastrone, N; Patrignani, C; Peoples, J; Petrucci, Ferruccio Carlo; Pia, Mg; Pordes, S; Rapidis, P; Ray, R; Reid, J; Rinaudo, G; Roccuzzo, B; Rosen, J; Santroni, A; Sarmiento, M; Savrie', Mauro; Schultz, J; Seth, Kk; Smith, Aj; Smith, Ga; Sozzi, M; Trokenheim, S; Weber, Mf; Werkema, S; Zhang, Y; Zhao, J; Zioulas, G.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/516449
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