TY - JOUR
T1 - Polarized angular distributions in the decays of the ψ' charmonium state directly produced in unpolarized proton-antiproton collisions
AU - Mok, A. W.K.
AU - Sebastian, K. J.
N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2008/7
Y1 - 2008/7
N2 - Using the helicity formulism, we calculate the combined angular distribution function of the polarized gamma photons and electron in the cascade process pp→ψ' →χJ +γ1 →ψ+γ2+γ1 →e++e-+ γ2+γ1 (J = 0, 1, 2), when p and p are unpolarized. We also present the partially integrated angular distribution functions in different cases. Our results show that by measuring the two-particle angular distribution of γ1 and γ2 and that of γ2 and e- with the polarization of either one of the two particles, one can determine the relative magnitudes as well as the relative phases of the helicity amplitudes in the radiative decay processes ψ' →χJ +γ1 and χJ →ψ+γ2.
AB - Using the helicity formulism, we calculate the combined angular distribution function of the polarized gamma photons and electron in the cascade process pp→ψ' →χJ +γ1 →ψ+γ2+γ1 →e++e-+ γ2+γ1 (J = 0, 1, 2), when p and p are unpolarized. We also present the partially integrated angular distribution functions in different cases. Our results show that by measuring the two-particle angular distribution of γ1 and γ2 and that of γ2 and e- with the polarization of either one of the two particles, one can determine the relative magnitudes as well as the relative phases of the helicity amplitudes in the radiative decay processes ψ' →χJ +γ1 and χJ →ψ+γ2.
UR - http://www.scopus.com/inward/record.url?scp=69549106542&partnerID=8YFLogxK
U2 - 10.1140/epjc/s10052-008-0649-8
DO - 10.1140/epjc/s10052-008-0649-8
M3 - Journal article
AN - SCOPUS:69549106542
SN - 1434-6044
VL - 56
SP - 189
EP - 202
JO - European Physical Journal C
JF - European Physical Journal C
IS - 2
M1 - 189
ER -