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Title: Resonance Extraction from the Finite Volume

The spectrum of excited hadrons becomes accessible in simulations of Quantum Chromodynamics on the lattice. Extensions of Lüscher's method allow to address multi-channel scattering problems using moving frames or modified boundary conditions to obtain more eigenvalues in finite volume. As these are at different energies, interpolations are needed to relate different eigenvalues and to help determine the amplitude. Expanding the T- or the K-matrix locally provides a controlled scheme by removing the known non-analyticities of thresholds. This can be stabilized by using Chiral Perturbation Theory. Different examples to determine resonance pole parameters and to disentangle resonances from thresholds are dis- cussed, like the scalar meson f0(980) and the excited baryons N(1535)1/2^- and Lambda(1405)1/2^-.
 [1] ;  [2]
  1. George Washington Univ., Washington, DC (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. George Washington Univ., Washington, DC (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
JLAB-THY-16-2324; DOE/OR/23177-3897
NSFCAREER grant No. 1452055; PIF grant No. 1415459
DOE Contract Number:
Resource Type:
Resource Relation:
Journal Name: JPS Conf.Proc.; Journal Volume: 10; Conference: NSTAR 2015, Osaka, Japan, May 25-28, 2015
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States