On the sensitive area of spin-parity analysis for J/Φ radiative decay products into two pseudoscalars
Yan Wuguang · 1990
The spin-parity analysis of the J/φ radiative decay products into two pseudoscalars usually uses the angular distribution calculated by the helicity amplitude formalism. This paper investigated the sensitivity of this method and pointed out the followings: 1). there really exists some insensitive area; 2). unfortunately, θ(1720)falls into the insensitive area of 2~(++)-0~(++) distinction; so the spin of θ(1720) has not been finally established yet; 3). according to the Mark-3 data, for the newly observed very narrow peak ξ(2230), the spin 0~(++) assignment can be ruled out.