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Type: Conference item
Title: N* Spectroscopy from lattice QCD: The Roper explained
Author: Leinweber, D.
Kamleh, W.
Kiratidis, A.
Liu, Z.-W.
Mahbub, S.
Roberts, D.
Stokes, F.
Thomas, A.W.
Wu, J.
Citation: Proceedings of the 10th International Workshop on the Physics of Excited Nucleons, 2016, pp.010011-1-010011-8
Publisher: Physical Scoiety of Japan
Issue Date: 2016
Conference Name: International Workshop on the Physics of Excited Nucleons (NSTAR) (25 May 2015 - 28 May 2015 : Osaka, JAPAN)
Statement of
Derek Leinweber, Waseem Kamleh, Adrian Kiratidis, Zhan-Wei Liu, Selim Mahbub, Dale Roberts, Finn Stokes, Anthony W. Thomas and Jiajun Wu
Abstract: This brief review focuses on the low-lying even- and odd-parity excitations of the nucleon obtained in recent lattice QCD calculations. Commencing with a survey of the 2014-15 literature we’ll see that results for the first even-parity excitation energy can differ by as much as 1 GeV, a rather unsat- isfactory situation. Following a brief review of the methods used to isolate excitations of the nucleon in lattice QCD, and drawing on recent advances, we’ll see how a consensus on the low-lying spec- trum has emerged among many different lattice groups. To provide insight into the nature of these states we’ll review the wave functions and electromagnetic form factors that are available for a few of these states. Consistent with the Luscher formalism for extracting phase shifts from finite volume spectra, the Hamiltonian approach to effective field theory in finite volume can provide guidance on the manner in which physical quantities manifest themselves in the finite volume of the lattice. With this insight, we will address the question; Have we seen the Roper in lattice QCD?
Keywords: Lattice quantum chromodynamics; baryon spectrum; excited states; wave functions; form factors; finite volume
Rights: © 2016 The Physical Society of Japan
DOI: 10.7566/JPSCP.10.010011
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