Closed k-strings in SU(N) gauge theories : 2+1 dimensions

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dc.creatorBringoltz, Barak
dc.creatorTeper, Michael
dc.date2008-02-11
dc.date.accessioned2026-07-07T11:40:15Z
dc.date.available2026-07-07T11:40:15Z
dc.descriptionWe calculate the ground state energies of closed k-strings in (2+1)-dimensional SU(N) gauge theories, for N=4,5,6,8 and k=2,3,4. From the dependence of the ground state energy on the string length, we infer that such k-strings are described by an effective string theory that is in the same bosonic universality class (Nambu-Goto) as the fundamental string. When we compare the continuum k-string tensions to the corresponding fundamental string tensions, we find that the ratios are close to, but typically 1-2 percent above, the Casimir scaling values favoured by some theoretical approaches. Fitting the N-dependence in a model-independent way favours an expansion in 1/N (as in Casimir scaling) rather than the 1/N^2 that is suggested by naive colour counting. We also observe that the low-lying spectrum of k-string states falls into sectors that belong to particular irreducible representations of SU(N), demonstrating that the dynamics of string binding knows about the full gauge group and not just about its centre.
dc.description22 pages, 8 figures
dc.identifierhttps://arxiv.org/abs/0802.1490
dc.identifierhttp://arxiv.org/abs/0802.1490
dc.identifierPhys.Lett.B663:429-437,2008
dc.identifierdoi:10.1016/j.physletb.2008.04.052
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/200196
dc.subjectHigh Energy Physics - Lattice
dc.subjectHigh Energy Physics - Theory
dc.titleClosed k-strings in SU(N) gauge theories : 2+1 dimensions
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