V-QCD: Spectra, the dilaton and the S-parameter
Nov, 2012
12 pages
Published in:
- Phys.Lett.B 720 (2013) 219-223
- Published: Mar 13, 2013
e-Print:
- 1211.6125 [hep-ph]
Report number:
- CCTP-2012-19
View in:
Citations per year
Abstract: (Elsevier)
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_fN_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 ratios 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.Note:
- 11 pages, 6 figures
- temperature: 0
- quantum chromodynamics
- dilaton
- back reaction
- holography
- conformal
- glueball
- scaling
- meson
References(38)
Figures(11)
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