String Theory of the Regge Intercept

Abstract

Using the Polchinski-Strominger effective string theory in covariant gauge, we compute the mass of a rotating string in D dimensions with large angular momenta J, in one or two planes, in fixed ratio, up to and including first subleading order in the large J expansion. This constitutes a first-principles calculation of the value for the order $J^0$ contribution to the mass-squared of a meson on the leading Regge trajectory in planar QCD with bosonic quarks. For open strings with Neumann boundary conditions, and for closed strings in $D\ge 5$, the order $J^0$ term in the mass-squared is exactly calculated by the semiclassical approximation. This term in the expansion is universal and independent of the details of the theory, assuming only D-dimensional Poincare invariance and the absence of other infinite-range excitations on the string worldvolume, beyond the Nambu-Goldstone bosons.

7 pages, LaTeX

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