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A search for the decays $B^+ \rightarrow h_c K^+$ and $B^0 \rightarrow h_cK_S^0$ is performed. Evidence for the decay $B^+ \rightarrow h_c K^+$ is found;its significance is $4.8\sigma$. No evidence is found for $B^0 \rightarrow h_cK_S^0$. The branching fraction for $B^+ \rightarrow h_c K^+$ is measured to be$(3.7^{+1.0}_{-0.9}{}^{+0.8}_{-0.8}) \times 10^{-5}$; the upper limit for the$B^0 \rightarrow h_c K_S^0$ branching fraction is $1.4 \times 10^{-5}$ at$90\%$ C.L. In addition, a study of the $p \bar{p} \pi^+ \pi^-$ invariant massdistribution in the channel $B^+ \to (p \bar{p} \pi^+ \pi^-) K^+$ results inthe first observation of the decay $\eta_c(2S) \to p \bar{p} \pi^+ \pi^-$ with$12.1\sigma$ significance. The analysis is based on the 711 $\mathrm{fb}^{-1}$data sample collected by the Belle detector at the asymmetric-energy $e^+ e^-$collider KEKB at the $\Upsilon(4S)$ resonance.

Evidence for $B^+ \rightarrow h_c K^+$ and observation of $\eta_c(2S) \to p \bar{p} \pi^+ \pi^-$