We report on a study of the angular distributions in the radiative decay of the χc1 and χc2 states formed in p̅ p annihilations. These distributions depend on the dynamics of the formation process and the multipole structure of the radiative decay. Using 2090 χc1 and 5908 χc2 events, we have measured the fractional magnetic quadrupole amplitude to be a2(χc1)≃M2/E1=0.002±0.032, and a2(χc2)=-0.093-0.041+0.039. We have also measured the square of the helicity 0 fractional amplitude in the χc2 formation process to be B02=0.13±0.08.
Study of the angular distributions of the reactions p¯p→χc1, χc2→J/ψ γ→e+e-γ
LO VETERE, MAURIZIO;MARINELLI, MAURO;PALLAVICINI, MARCO;PATRIGNANI, CLAUDIA;SANTRONI, ALBERTO;
2002-01-01
Abstract
We report on a study of the angular distributions in the radiative decay of the χc1 and χc2 states formed in p̅ p annihilations. These distributions depend on the dynamics of the formation process and the multipole structure of the radiative decay. Using 2090 χc1 and 5908 χc2 events, we have measured the fractional magnetic quadrupole amplitude to be a2(χc1)≃M2/E1=0.002±0.032, and a2(χc2)=-0.093-0.041+0.039. We have also measured the square of the helicity 0 fractional amplitude in the χc2 formation process to be B02=0.13±0.08.
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