Color dependence of tensor and scalar glueball masses in Yang-Mills theories

Abstract

We report the masses of the lightest spin-0 and spin-2 glueballs obtained in an extensive lattice study of the continuum and infinite volume limits of $Sp(N_c)$ gauge theories for $N_c=2,4,6,8$. We also extrapolate the combined results towards the large-$N_c$ limit. We compute the ratio of scalar and tensor masses, and observe evidence that this ratio is independent of $N_c$. Other lattice studies of Yang-Mills theories at the same space-time dimension provide a compatible ratio. We further compare these results to various analytical ones and discuss them in view of symmetry-based arguments related to the breaking of scale invariance in the underlying dynamics, showing that a constant ratio might emerge in a scenario in which the $0^{++}$ glueball is interpreted as a dilaton state.

6 pages, 1 figure: v2. minor changes in Sp(4) data and the title, to appear in PRD

References in corpus (4)

• Glueball masses in the large N limit
• SU(N) gauge theories in 2+1 dimensions: glueball spectra and k-string tensions
• On the Glueball Spectrum of Pure Yang-Mills Theory in 2+1 Dimensions
• Probing the holographic dilaton

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