Tail probability of maximal displacement in critical and subcritical branching stable processes

In this paper, we study critical and subcritical branching $\alpha$-stable processes, $\alpha \in (0,2)$. We obtain the exact asymptotic behaviors of the tails of the maximal positions of all subcritical branching $\alpha$-stable processes with positive jumps. In the case of subcritical branching spectrally negative $\alpha$-stable processes, we obtain the exact asymptotic behaviors of the tails of the maximal positions under the assumption that the offspring distributions satisfy the $L\log L$ condition. For critical branching $\alpha$-stable processes, we obtain the exact asymptotic behaviors of the tails under the assumption that the offspring distributions belong to the domain of attraction of a $\gamma$-distribution, $\gamma \in (1,2]$.