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 bMN. 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 the 1−− 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.

This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: http://dx.doi.org/10.1007/JHEP04(2013)104

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Work Title Successes and failures of a more comprehensive hard wall AdS/QCD
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Open Access
Creators
  1. S. K. Domokos
  2. J. A. Harvey
  3. A. B. Royston
Keyword
  1. AdS-CFTCorrespondence
  2. AdS/QCD
License In Copyright (Rights Reserved)
Work Type Article
Publisher
  1. Journal of High Energy Physics
Publication Date April 18, 2013
Publisher Identifier (DOI)
  1. https://doi.org/10.1007/JHEP04(2013)104
Deposited December 17, 2023

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  • Added 1210.6351-1.pdf
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  • Added Creator J. A. Harvey
  • Added Creator A. B. Royston
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    Keyword
    • AdS-CFTCorrespondence, AdS/QCD
    Description
    • We explore corrections to the “hard wall” gravity dual of QCD with two-form tensor fields b<sub>MN</sub>. These fields correspond to the quark bilinear O <sup>T</sup> = qσ<sup>µν</sup> q of QCD, which generates states with quantum numbers 1<sup>−−</sup> and 1<sup>+−</sup>, or ω/ρ-like and h<sub>1</sub>/b<sub>1</sub>-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<sup>V</sup> and O<sup>T</sup> , and breaking the degeneracy of the1<sup>−−</sup>and 1<sup>+−</sup> spectra. We also compute the b<sub>1</sub> → 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.
    • We explore corrections to the “hard wall” gravity dual of QCD with two-form tensor fields b<sub>MN</sub>. 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 h<sub>1</sub>/b<sub>1</sub>-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 the 1−− and 1 +− spectra. We also compute the b<sub>1</sub> → 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.
  • Updated