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We construct a new, simple phenomenological model along the lines of AdS/QCD.The essential new ingredient is the brane-antibrane effective action includingthe open string tachyon proposed by Sen. Chiral symmetry breaking happensbecause of tachyon dynamics. We fit a large number of low-spin meson masses atthe 10%-15% level. The only free parameters involved in the fits correspond tothe overall QCD-scale and the quark masses. Several aspects of previous modelsare qualitatively improved.

An AdS/QCD model from Sen's tachyon action