We report on a study of the angular distributions in the radiative decay of the Xc1 and Xc2 states formed in p̄p annihilations. These distributions depend on the dynamics of the formation process and the multipole structure of the radiative decay. Using 2090 Xc1 and 5908 Xc2 events, we have measured the fractional magnetic quadrupole and amplitude to be a2(Xc1)-M 2/E1 ≃ 0.002±0.032, a2(Xc2) = -0.093-0.041+0.039. We have also measured the square of the helicity 0 fractional amplitude in the Xc2 formation process to be B02 =0.13 ±0.08.
|Original language||English (US)|
|Number of pages||4680190|
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|State||Published - Mar 1 2002|
ASJC Scopus subject areas
- Nuclear and High Energy Physics