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Recently, the LHCb Collaboration has measured the processes$B^0\to\bar{D}^0D_s^+\pi^-$ and $B^+\to\bar{D}^0D_s^+\pi^+$, where the$D_s^+\pi^-$ and $D_s^+\pi^+$ invariant mass distributions show the significantsignals of two new open-flavor tetraquark states $T_{c\bar{s}}(2900)^0$ and$T_{c\bar{s}}(2900)^{++}$, as the two of the isospin triplet. In this work, wehave investigated the process $\Lambda_b\to K^0D^0\Lambda$ by taking intoaccount the intermediate nucleon resonance $N^*(1535)$ and the tetraquark state$T_{c\bar{s}}(2900)^0$, which could be dynamically generated by theinteractions of the $D^*K^*/D^*_s\rho$ and the pseoduscalar mesons-octetbaryons, respectively. Our results show that a clear peak of the open-flavortetraquark $T_{c\bar{s}}(2900)$ may appear in the $K^0D^0$ invariant massdistribution of the process $\Lambda_b\to K^0D^0\Lambda$, which could be testedby future experiments.

Theoretical study of the open-flavor tetraquark $T_{c\bar{s}}(2900)$ in the process $\Lambda_b\to K^0D^0\Lambda$