Abstract
We study k-strings in deformed Yang-Mills (dYM) with SU(N) gauge group in the semiclassically calculable regime on \( {\mathbb{R}}^3\times {\mathbb{S}}^1 \). Their tensions Tk are computed in two ways: numerically, for 2 ≤ N ≤ 10, and via an analytic approach using a re-summed perturbative expansion. The latter serves both as a consistency check on the numerical results and as a tool to analytically study the large-N limit. We find that dYM k-string ratios Tk/T1 do not obey the well-known sine- or Casimir-scaling laws. Instead, we show that the ratios Tk/T1 are bound above by a square root of Casimir scaling, previously found to hold for stringlike solutions of the MIT Bag Model. The reason behind this similarity is that dYM dynamically realizes, in a theoretically controlled setting, the main model assumptions of the Bag Model. We also compare confining strings in dYM and in other four-dimensional theories with abelian confinement, notably Seiberg-Witten theory, and show that the unbroken \( {\mathbb{Z}}_N \) center symmetry in dYM leads to different properties of k-strings in the two theories; for example, a “baryon vertex” exists in dYM but not in softly-broken Seiberg-Witten theory. Our results also indicate that, at large values of N, k-strings in dYM do not become free.
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Poppitz, E., Shalchian T., M.E. String tensions in deformed Yang-Mills theory. J. High Energ. Phys. 2018, 29 (2018). https://doi.org/10.1007/JHEP01(2018)029
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DOI: https://doi.org/10.1007/JHEP01(2018)029