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V-QCD: Spectra, the dilaton and the S-parameter

D. Arean 1 I. Iatrakis 2 M. Järvinen 3 E. Kiritsis 4 
CCTP - Crete Center for Theoretical Physics [Heraklion]
APC (UMR_7164) - AstroParticule et Cosmologie, Institut für theoretische Physik
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_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.
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Submitted on : Sunday, May 26, 2013 - 8:13:39 PM
Last modification on : Thursday, November 18, 2021 - 3:57:10 AM

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D. Arean, I. Iatrakis, M. Järvinen, E. Kiritsis. V-QCD: Spectra, the dilaton and the S-parameter. Physics Letters B, Elsevier, 2013, 720, pp.219-223. ⟨10.1016/j.physletb.2013.01.070⟩. ⟨in2p3-00826110⟩



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