N* Spectroscopy from Lattice QCD: The Roper Explained **

Derek Leinweber, Waseem Kamleh, Adrian Kiratidis, Zhan-Wei Liu, Selim Mahbub, Dale Roberts, Finn M. Stokes, Anthony Thomas, Jiajun Wu

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    Abstract

    This brief review focuses on the low-lying eVeil- 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 unsatisfactory sit uation.lollowing a brief review of the methods used to isolate excitations of the nucleon in lattice Q( 'I), and drawing on recent advances, we'll see how a consensus on the low-lying spectrum 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?
    Original languageEnglish
    Title of host publicationProceedings of the 10th International Workshop on the Physics of Excited Nucleons (NSTAR2015)
    Place of PublicationJapan
    PublisherPhysical Society of Japan
    Number of pages8
    ISBN (Print)978-4-89027-114-6
    DOIs
    Publication statusPublished - 2016
    Event10th International Workshop on the Physics of Excited Nucleons (NSTAR2015) - Osaka, Japan
    Duration: 1 Jan 2015 → …

    Conference

    Conference10th International Workshop on the Physics of Excited Nucleons (NSTAR2015)
    Period1/01/15 → …
    OtherMay 25-28, 2015

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