V-QCD: Spectra, the dilaton and the S-parameter
High Energy Physics - Phenomenology
2015-06-12 v1 High Energy Physics - Lattice
High Energy Physics - Theory
Abstract
Zero temperature spectra of mesons and glueballs are analyzed in a class of holographic bottom-up models for QCD (named V-QCD), as a function of x = N_f/N_c with the full back-reaction included. It is found that spectra are discrete and gapped (modulo the pions) in the QCD regime, for x below the critical value x_c where the conformal transition takes place. The masses uniformly converge to zero in the walking region x -> x_c due to Miransky scaling. The ratio of masses all asymptote to non-zero constants as x -> x_c and therefore there is no "dilaton" in the spectrum. The S-parameter is computed and found to be of O(1) in the walking regime.
Cite
@article{arxiv.1211.6125,
title = {V-QCD: Spectra, the dilaton and the S-parameter},
author = {Daniel Arean and Ioannis Iatrakis and Matti Jarvinen and Elias Kiritsis},
journal= {arXiv preprint arXiv:1211.6125},
year = {2015}
}
Comments
11 pages, 6 figures