We explore corrections to the “hard wall” gravity dual of QCD with two-form tensor fields bMN. These fields correspond to the quark bilinear O T = qσµν 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 JV and OT , 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.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics