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We study the charmless two-body $\Lambda_b\to \Lambda (\phi,\eta^{(\prime)})$and three-body $\Lambda_b\to \Lambda K^+K^- $ decays. We obtain ${\calB}(\Lambda_b\to \Lambda\phi)=(3.53\pm 0.24)\times 10^{-6}$ to agree with therecent LHCb measurement. However, we find that ${\cal B}(\Lambda_b\to\Lambda(\phi\to)K^+ K^-)=(1.71\pm 0.12)\times 10^{-6}$ is unable to explain theLHCb observation of ${\cal B}(\Lambda_b\to\Lambda K^+ K^-)=(15.9\pm 1.2\pm1.2\pm 2.0)\times 10^{-6}$, which implies the possibility for othercontributions, such as that from the resonant $\Lambda_b\to K^-N^*,\,N^*\to\Lambda K^+$ decay with $N^*$ as a higher-wave baryon state. For$\Lambda_b\to \Lambda \eta^{(\prime)}$, we show that ${\cal B}(\Lambda_b\to\Lambda\eta,\,\Lambda\eta^\prime)= (1.47\pm 0.35,1.83\pm 0.58)\times 10^{-6}$,which are consistent with the current data of $(9.3^{+7.3}_{-5.3},<3.1)\times10^{-6}$, respectively. Our results also support the relation of ${\calB}(\Lambda_b\to \Lambda\eta) \simeq {\cal B}(\Lambda_b\to\Lambda\eta^\prime)$,given by the previous study.

Study of $\Lambda_b\to \Lambda (\phi,\eta^{(\prime)})$ and $\Lambda_b\to \Lambda K^+K^-$ decays