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Conformal versus confining scenario in SU(2) with adjoint fermions

L. Del Debbio, B Lucini, A Patella, C Pica, A Rago, Biagio Lucini Orcid Logo

Physical Review D, Volume: 80, Issue: 7

Swansea University Author: Biagio Lucini Orcid Logo

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Abstract

<p>The masses of the lowest-lying states in the meson and in the gluonic sector of an SU(2) gauge theory with two Dirac flavors in the adjoint representation are measured on the lattice at a fixed value of the lattice coupling <span><span>β</span>=4/<span>g</span>...

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Published in: Physical Review D
ISSN: 1550-7998 1550-2368
Published: 2009
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa1137
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Abstract: <p>The masses of the lowest-lying states in the meson and in the gluonic sector of an SU(2) gauge theory with two Dirac flavors in the adjoint representation are measured on the lattice at a fixed value of the lattice coupling <span><span>β</span>=4/<span>g</span><sub>0</sub><sup>2</sup>=2.25</span> for values of the bare fermion mass <span><span>m</span><sub>0</sub></span> that span a range between the quenched regime and the massless limit, and for various lattice volumes. Even for light constituent fermions the lightest glueballs are found to be lighter than the lightest mesons. Moreover, the string tension between two static fundamental sources strongly depends on the mass of the dynamical fermions and becomes of the order of the inverse squared lattice linear size before the chiral limit is reached. The implications of these findings for the phase of the theory in the massless limit are discussed and a strategy for discriminating between the (near-)conformal and the confining scenario is outlined.</p>
College: Faculty of Science and Engineering
Issue: 7