Please use this identifier to cite or link to this item:
|Scopus||Web of Science®||Altmetric|
|Title:||Search for low-lying lattice QCD eigenstates in the Roper regime|
|Citation:||Physical Review D, 2017; 95(7):074507-1-074507-8|
|Publisher:||American Physical Society|
|Adrian L. Kiratidis, Waseem Kamleh, Derek B. Leinweber, Zhan-Wei Liu, Finn M. Stokes and Anthony W. Thomas|
|Abstract:||The positive-parity nucleon spectrum is explored in 2 + 1 flavor lattice QCD in a search for new low-lying energy eigenstates near the energy regime of the Roper resonance. In addition to conventional three-quark operators, we consider novel, local five-quark meson-baryon type interpolating fields that hold the promise to reveal new eigenstates that may have been missed in previous analyses. Drawing on phenomenological insight, five-quark operators based on σN, πN and a0N channels are constructed. Spectra are produced in a high-statistics analysis on the PACS-CS dynamical gauge-field configurations with mπ = 411 MeV via variational analyses of several operator combinations. Despite the introduction of qualitatively different interpolating fields, no new states are observed in the energy regime of the Roper resonance. This result provides further evidence that the low-lying finite-volume scattering states are not localized, and strengthens the interpretation of the Roper as a coupled-channel, dynamically-generated meson-baryon resonance.|
|Rights:||© 2017 American Physical Society|
|Appears in Collections:||Chemistry and Physics publications|
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.