Study of hc→3 (π+π-)π0, hc→2 (π+π-)ω, hc→2 (π+π-)π0η, hc→2 (π+π-)η, and hc→p p ¯

Based on (2712.4±14.1)×106 ψ(3686) events collected with the BESIII detector, we study the decays hc→3(π+π−)π0, hc→2(π+π−)ω, hc→2(π+π−)π0η, hc→2(π+π−)η, and hc→p¯p via ψ(3686)→π0hc. The decay channel hc→3(π+π−)π0 is observed for the first time, and its branching fraction is determined to be (9.28±1.14±0.77)×10−3, where the first uncertainty is statistical and the second is systematic. In addition, first evidence is found for the modes hc→2(π+π−)π0η and hc→2(π+π−)ω with significances of 4.8σ and 4.7σ, and their branching fractions are determined to be (7.55±1.51±0.77)×10−3 and (4.00±0.86±0.35)×10−3, respectively. No significant signals of hc→2(π+π−)η and hc→p¯p are observed, and the upper limits of the branching fractions of these decays are determined to be <6.19×10−4 and <4.40×10−5 at the 90% confidence level, respectively.