Resonance Extraction from the Finite Volume

Conference · Wed Jun 01 00:00:00 EDT 2016 · JPS Conf.Proc.

DOI:https://doi.org/10.7566/JPSCP.10.061002· OSTI ID:1302295

Doring, Michael ^[1]; Molina Peralta, Raquel ^[2]

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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)

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^-.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1302295
• Report Number(s): JLAB-THY-16-2324; DOE/OR/23177-3897; NSFCAREER grant No. 1452055; PIF grant No. 1415459
• Journal Information: JPS Conf.Proc., Vol. 10; Conference: NSTAR 2015, Osaka, Japan, May 25-28, 2015
• Country of Publication: United States
• Language: English