We report on a study of the angular distributions in the radiative decay of the chi(c1) and chi(c2) states formed in (p) over barp annihilations. These distributions depend on the dynamics of the formation process and the multipole structure of the radiative decay. Using 2090 chi(c1) and 5908 chi(c2) events, we have measured the fractional magnetic quadrupole amplitude to be a(2)(chi(c1))similar or equal toM2/E1 =0.002+/-0.032, and a(2)(chi(c2))= -0.093(-0.041)(+0.039). We have also measured the square of the helicity 0 fractional amplitude in the chi(c2) formation process to be B-0(2)=0.13 +/-0.08.

Study of the angular distributions of the reactions (p)over-bar-p ->chi(c1),chi(c2)-> J/psi gamma -> e(+)e(-)gamma

CALABRESE, Roberto;LUPPI, Eleonora;SAVRIE', Mauro;
2002

Abstract

We report on a study of the angular distributions in the radiative decay of the chi(c1) and chi(c2) states formed in (p) over barp annihilations. These distributions depend on the dynamics of the formation process and the multipole structure of the radiative decay. Using 2090 chi(c1) and 5908 chi(c2) events, we have measured the fractional magnetic quadrupole amplitude to be a(2)(chi(c1))similar or equal toM2/E1 =0.002+/-0.032, and a(2)(chi(c2))= -0.093(-0.041)(+0.039). We have also measured the square of the helicity 0 fractional amplitude in the chi(c2) formation process to be B-0(2)=0.13 +/-0.08.
2002
Ambrogiani, M; Bagnasco, S; Baldini, W; Bettoni, D; Borreani, G; Buzzo, A; Calabrese, Roberto; Cester, R; Dalpiaz, P; Fan, X; Garzoglio, G; Gollwitzer, K; Hahn, A; Jin, S; Kasper, J; Lasio, G; Lovetere, M; Luppi, Eleonora; Maas, P; Macri, M; Mandelkern, M; Marchetto, F; Marinelli, M; Menichetti, E; Mussa, R; Obertino, M; Pallavicini, M; Pastrone, N; Patrignani, C; Pedlar, T; Pordes, S; Robutti, E; Rosen, J; Rumerio, P; Santroni, A; Savrie', Mauro; Schultz, J; Seth, Kk; Stancari, G; Stancari, M; Streets, J; Tomaradze, A; Werkema, S; Zioulas, G.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1211566
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