A possible method to detect the preferred Lorentz frame

It has been argued that quantum collapse, if exists, can result in the appearance of quantum nonlocality, and requires the existence of a preferred Lorentz frame. In this letter, we analyze how to detect the preferred Lorentz frame in the framework of one kind of dynamical collapse theory. It is shown that the theory provides a possible method to detect the preferred Lorentz frame through measuring the collapse time of wave function. A concrete detecting scheme based on the KL meson decay is also presented. We show that the possible seasonal change of the CP branching ratio of KL meson measured in the Earth may indicate the existence of a preferred Lorentz frame.