Successes and failures of a more comprehensive hard wall AdS/QCD

We explore corrections to the “hard wall” gravity dual of QCD with two-form tensor fields b_MN. These fields correspond to the quark bilinear O ^T = qσ^µν q of QCD, which generates states with quantum numbers 1⁻⁻ and 1⁺⁻, or ω/ρ-like and h₁/b₁-like mesons, respectively. We include new interaction terms, which render the model complete up to dimension six. We find that breaking chiral symmetry induces modifications to the spectrum, by mixing the vector current J^V and O^T , and breaking the degeneracy of the1⁻⁻and 1⁺⁻ spectra. We also compute the b₁ → ωπ decay rate and D/S ratio and the couplings of excited ρ states to two pions, performing a comprehensive new fit to the QCD data. We obtain a value for the magnetic susceptibility of the QCD quark condensate which is consistent with phenomenological estimates. These results allow us to evaluate the success of dimension counting and UV matching in this model.