Three flavour QCD from the holographic principle

Abstract

Building on recent research into five-dimensional holographic models of QCD, we extend this work by including the strange quark with an SU (3) L × SU (3) R gauge symmetry in the five-dimensional theory. In addition we deform the naive AdS metric with a single parameter, thereby breaking the conformal symmetry at low energies. The vector and axial vector sectors are studied in detail and both the masses and decay constants are calculated with the additional parameters. It is shown that with a single extra degree of freedom, exceptional agreement with experimental results can be obtained in the light quark sector while the kaon sector of the vector and axial vector octet is found to give around 10% agreement with lattice results. We propose some simple extensions to this work to be taken up in future research.

Mesons in gauge/gravity duals

“…The reader is referred to the following references. Strange quarks are added in [232]. Higher-spin mesons are studied in [233].…”

Thermodynamics of SU(N) Yang-Mills theories in 2 + 1 dimensions II — The deconfined phase

“…In our previous work [23], we exploited this fact in order to fit the strange-strange mesons together with the lightlight mesons, with rather successful results. In [64], the authors added the strange quark mass to the hard wall model and computed the dependence of vector masses on the quark mass. In that case however, this dependence of the vector masses originated only from the non-abelian structure and therefore misses at least part of the physics.…”

Strange mesons and kaon-to-pion transition form factors from holography

“…Predictions of the model for masses and decay constants using terms up to second order expansion in the fields of the 5D action are summarized in Table I. These may be compared to results in [33,34,40].…”