Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2003-04-04
JHEP 0307:049,2003
Physics
High Energy Physics
High Energy Physics - Theory
LaTeX, 39 pages, 4 figures, uses epsf. v2: typos corrected. references added
Scientific paper
10.1088/1126-6708/2003/07/049
We compute the meson spectrum of an N=2 super Yang-Mills theory with fundamental matter from its dual string theory on AdS_5 x S_5 with a D7-brane probe. For scalar and vector mesons with arbitrary R-charge the spectrum is computed in closed form by solving the equations for D7-brane fluctuations; for matter with non-zero mass m_q it is discrete, exhibits a mass gap of order m_q / sqrt(g_s N) and furnishes representations of SO(5) even though the manifest global symmetry of the theory is only SO(4). The spectrum of mesons with large spin J is obtained from semiclassical, rotating open strings attached to the D7-brane. It displays Regge-like behaviour for J << sqrt(g_s N), whereas for J >> sqrt(g_s N) it corresponds to that of two non-relativistic quarks bound by a Coulomb potential. Meson interactions, baryons and `giant gauge bosons' are briefly discussed.
Kruczenski Martin
Mateos David
Myers Robert C.
Winters David J.
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