Abstract
We make use of a unitarized coupled-channel model to analyze the mass distribution data of final states in production processes of . By analyzing the analytical structures of the decay amplitudes, we find that the line shape of the signal is related to the combined effect of a pair of near-threshold “shadow” poles and the thresholds, in which the third-sheet pole might provide a dominant contribution. As all the coupled channels effects are tuning off, the trajectories of these two poles suggest that the might originate from the attractive interaction of through a long-distance interaction, e.g., -exchange interaction, as a “deuteron-like” state. There is no nearby pole structure corresponding to the signal in the mass distribution.
- Received 6 June 2015
DOI:https://doi.org/10.1103/PhysRevD.92.094024
© 2015 American Physical Society