Search for low-lying lattice QCD eigenstates in the Roper regime

Date

2017

Authors

Kiratidis, A.
Kamleh, W.
Leinweber, D.
Liu, Z.
Stokes, F.
Thomas, A.

Editors

Advisors

Journal Title

Journal ISSN

Volume Title

Type:

Journal article

Citation

Physical Review D (particles, fields, gravitation, and cosmology), 2017; 95(7):074507-1-074507-8

Statement of Responsibility

Adrian L. Kiratidis, Waseem Kamleh, Derek B. Leinweber, Zhan-Wei Liu, Finn M. Stokes and Anthony W. Thomas

Conference Name

DOI

10.1103/PhysRevD.95.074507

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.

School/Discipline

Dissertation Note

Provenance

Description

Access Status

Rights

© 2017 American Physical Society

License

Grant ID

http://purl.org/au-research/grants/arc/CE1101004
 http://purl.org/au-research/grants/arc/LE160100051
 http://purl.org/au-research/grants/arc/DP150103101
 http://purl.org/au-research/grants/arc/DP150103164
 http://purl.org/au-research/grants/arc/DP120104627
 http://purl.org/au-research/grants/arc/LE120100181

Published Version

https://doi.org/10.1103/physrevd.95.074507

Call number

Persistent link to this record

http://hdl.handle.net/2440/106143