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Type: Journal article
Title: Structure of the Λ (1405) from Hamiltonian effective field theory
Other Titles: Structure of the Lambda (1405) from Hamiltonian effective field theory
Author: Liu, Z.-W.
Hall, J.
Leinweber, D.
Thomas, A.
Wu, J.-J.
Citation: Physical Review D, 2017; 95(1):014506-1-014506-10
Issue Date: 2017
ISSN: 2470-0010
Statement of
Zhan-Wei Liu, Jonathan M. M. Hall, Derek B. Leinweber, Anthony W. Thomas and Jia-Jun Wu
Abstract: The pole structure of the Λ(1405) is examined by fitting the couplings of an underlying Hamiltonian effective field theory to cross sections of K−p scattering in the infinite-volume limit. Finite-volume spectra are then obtained from the theory, and compared to lattice QCD results for the mass of the Λ(1405). Momentum-dependent, nonseparable potentials motivated by the well-known Weinberg-Tomozawa terms are used, with SU(3) flavor symmetry broken in the couplings and masses. In addition, we examine the effect on the behavior of the spectra from the inclusion of a bare triquarklike isospin-zero basis state. It is found that the cross sections are consistent with the experimental data with two complex poles for the Λ(1405), regardless of whether a bare-baryon basis state is introduced or not. However, it is apparent that the bare baryon is important for describing the results of lattice QCD at high pion masses.
Rights: © 2017 American Physical Society
DOI: 10.1103/PhysRevD.95.014506
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