Study of the processes ?cJ ? ? ? ? ¯ + and ?0 ? ¯ 0

Abstract

Abstract: Using 448.1 × 106?(3686) decays collected with the BESIII detector at the BEPCII e+e? storage rings, the branching fractions and angular distributions of the decays ?cJ? ??? ¯ + and ?0? ¯ 0 (J = 0, 1, 2) are measured based on a partial-reconstruction technique. The decays ?c1? ?0? ¯ 0 and ?c2? ?0? ¯ 0 are observed for the first time with statistical significances of 7? and 15?, respectively. The results of this analysis are in good agreement with previous measurements and have significantly improved precision. [Figure not available: see fulltext.] © 2022, The Author(s).