Lambda_c(2595)是非常特殊的粲重子激发态，它与pi介子及Sigma_c重子的阈值只有不到2MeV的能差。在有效场论的框架下，这种近阈共振态暗示pi介子与Sigma_c在S wave有相当强烈的相互吸引。我们计划先在理论上讨论Sigma_c是否能吸引两个pi介子，并进一步形成具有更复杂结构的共振态的可能性。如果理论计算支持该三体共振态的存在，我们将在已发表的实验数据中寻找证据，或者为实验提出如何寻找该共振态的建议。其它相关的粲重子与双pi介子的三体系统也会一并加以研究，比如pi + pi + 基态Lambda_c与Lambda_c(2595)之间的关系。

Lambda_c(2595) is a very special excited charmed baryon because it sits only about 2 MeVs above the pi-Sigma_c threshold. From the viewpoint of effective field theory, its closeness to the threshold implies a strong long-range attraction between the pion and the Sigma_c in the S wave. First, we plan to investigate theoretically the possibility that the Sigma_c can trap one more pion to form a near-threshold three-body resonance. If theoretically viable, we will search in the next step for experimental evidences from published data, or make recommendations on channels and kinemaitc domains for experimentalists to search for such a resonance. Other three-body systems composed of a charmed baryon and two pions will investigated too, such as pi + pi + ground state Lambda_c.