Generating a resonance-like structure in the reaction $$B_c\rightarrow B_s \pi \pi $$ B c → B s π π

Abstract

Abstract We investigate the process $$B_c^+\rightarrow B_s^0\pi ^+\pi ^0$$ B c + → B s 0 π + π 0 via $$B\bar{K}^*$$ B K ¯ ∗ rescattering. The kinematic conditions for triangle singularities are perfectly satisfied in the rescattering diagrams. A resonance-like structure around the $$B\bar{K}$$ B K ¯ threshold, which we denote X(5777), is predicted to be present in the invariant mass distribution of $$B_s^0 \pi ^+$$ B s 0 π + . Because the relative weak $$B\bar{K}$$ B K ¯ $$(I=1)$$ ( I = 1 ) interaction does not support the existence of a dynamically generated hadronic molecule, X(5777) can be identified as a pure kinematical effect due to the triangle singularity. Its observation may help to establish a non-resonance interpretation for some XYZ particles.