FLIC fermions and hadron phenomenology

D. B. Leinweber; J. N. Hedditch; W. Melnitchouk; A. W. Thomas; A. G. Williams; R. D. Young; J. M. Zanotti; J. B. Zhang

doi:10.1140/epja/i2002-10209-3

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2024 Impact factor 2.8

Hadrons and Nuclei

Eur. Phys. J. A (2003) 18: 247-252
https://doi.org/10.1140/epja/i2002-10209-3

FLIC fermions and hadron phenomenology

D. B. Leinweber¹^*, J. N. Hedditch¹, W. Melnitchouk¹^,2, A. W. Thomas¹, A. G. Williams¹, R. D. Young¹, J. M. Zanotti¹ and J. B. Zhang¹

¹ Centre for the Subatomic Structure of Matter and Department of Physics and Mathematical Physics, University of Adelaide, SA 5005, Adelaide, Australia
² Jefferson Lab, 12000 Jefferson Avenue, VA 23606, Newport News, USA

^* e-mail: dleinweber@physics.adelaide.edu.au

Abstract

A pedagogical overview of the formulation of the Fat-Link-Irrelevant-Clover (FLIC) fermion action and its associated phenomenology is described. The scaling analysis indicates FLIC fermions provide a new form of nonperturbative ${\mathcal O}(a)$ improvement where near-continuum results are obtained at finite lattice spacing. Spin-(1/2) and spin-(3/2), even- and odd-parity baryon resonances are investigated in quenched QCD, where the nature of the Roper resonance and $\Lambda^*(1405)$ are of particular interest. FLIC fermions allow efficient access to the light-quark-mass regime, where evidence of chiral nonanalytic behavior in the $\Delta$ mass is observed.