Application of the maximum entropy method to the (2 + 1)D four-fermion model

Allton, C. R., Clowser, J. E., Hands, S. J., Kogut, J. B. and Strouthos, C. G. (2002) Application of the maximum entropy method to the (2 + 1)D four-fermion model. Physical Review D, 66 9: 094511.1-094511.12. doi:10.1103/PhysRevD.66.094511

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Author Allton, C. R.
Clowser, J. E.
Hands, S. J.
Kogut, J. B.
Strouthos, C. G.
Title Application of the maximum entropy method to the (2 + 1)D four-fermion model
Journal name Physical Review D   Check publisher's open access policy
ISSN 0556-2821
Publication date 2002-11-01
Sub-type Article (original research)
DOI 10.1103/PhysRevD.66.094511
Open Access Status File (Publisher version)
Volume 66
Issue 9
Start page 094511.1
End page 094511.12
Total pages 12
Place of publication College Park, MD, United States
Publisher American Physical Society
Language eng
Abstract We investigate spectral functions extracted using the maximum entropy method from correlators measured in lattice simulations of the (2+1)-dimensional four-fermion model. This model is particularly interesting because it has both a chirally broken phase with a rich spectrum of mesonic bound states and a symmetric phase where there are only resonances. In the broken phase we study the elementary fermion, pion, sigma, and massive pseudoscalar meson; our results confirm the Goldstone nature of the π and permit an estimate of the meson binding energy. We have, however, seen no signal of σ→ππ decay as the chiral limit is approached. In the symmetric phase we observe a resonance of nonzero width in qualitative agreement with analytic expectations; in addition the ultraviolet behavior of the spectral functions is consistent with the large nonperturbative anomalous dimension for fermion composite operators expected in this model.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Article ID: 094511

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Physical Sciences Publications
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Created: Tue, 14 Aug 2007, 18:31:44 EST