Lattice QCD studies of pentaquarks and exotics
Date
2006
Authors
Lasscock, B.
Hedditch, J.
Kamleh, W.
Leinweber, D.
Melnitchouk, W.
Thomas, A.
Williams, A.
Young, R.
Zanotti, J.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Conference paper
Citation
Nuclear Physics B-Proceedings Supplements, 2006; 153(1):348-353
Statement of Responsibility
B.G. Lasscock, J. Hedditch, W. Kamleh, D.B. Leinweber, W. Melnitchouk, A.W. Thomas, A.G. Williams, R.D. Young and J.M. Zanotti
Conference Name
Workshop on Computational Hadron Physics (2005 : Nicosia, Cyprus)
Abstract
The possible discovery of the Θ<sup>+</sup> pentaquark has motivated a number of studies into its nature using lattice QCD. Initial studies focused on spin-1/2 states and more recently also spin-3/2 states. Here we report the results of the first exploratory study in quenched lattice QCD of pentaquarks with both spin-1/2 and spin-3/2 using the FLIC fermion action. We do not find any evidence for the standard lattice resonance signature of attraction (i.e. binding at quark masses near the physical regime) in the spin-1/2 channels or in the J<sup>P</sup> = 3/2<sup>-</sup> channel. Some evidence of binding is inferred in the isoscalar 3/2<sup>+</sup> channel. We also present the results of our study into exotic meson states using hybrid meson interpolators with explicit gluonic degrees of freedom. We find a candidate for the J<sup>PC</sup> = 1<sup>-+</sup> exotic meson which has a mass consistent with the π<inf>1</inf> (1600) experimental candidate. © 2006 Published by Elsevier B.V.