Compositeness of Near Threshold Quasi-Bound States

Abstract

We study the compositeness of unstable hadrons which lie near the two-hadron threshold. In the framework of the effective field theory, we derive the relation between the compositeness of stable bound states with observables. We then extend this relation for the quasi-bound states with finite decay width. A prescription to interpret the complex value of the compositeness is presented. With this method, we show that Lambda(1405) is dominated by the Kbar N composite component and a_0(980) have only small Kbar K fraction.

6 pages, no figure, talk given at the XVI International Conference on Hadron Spectroscopy (Hadron2015), Sep. 13-18, 2015, Newport News, VA

References in corpus (10)

• Heavy quarkonium: progress, puzzles, and opportunities
• Lattice QCD Evidence that the Lambda(1405) Resonance is an Antikaon-Nucleon Molecule
• Constraints on the chiral unitary $\bar{K}N$ amplitude from $\pi \Sigma K^{+}$ photoproduction data
• Comprehensive analysis of the wave function of a hadronic resonance and its compositeness
• New insights into antikaon-nucleon scattering and the structure of the Lambda(1405)
• Probabilistic interpretation of compositeness relation for resonances
• Scattering Models for Ultracold Atoms
• Structure of near-threshold quasi-bound states
• Re-analysis of data on a0(1450) and a0(980)
• Structure of Lambda(1405) and construction of KbarN local potential based on chiral SU(3) dynamics