An eta primer: solving the U(1) problem with AdS/QCD

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Published 27 August 2007 • Published under licence by IOP Publishing Ltd
, , Citation Emanuel Katz and Matthew D. Schwartz JHEP08(2007)077 DOI 10.1088/1126-6708/2007/08/077

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Author affiliations

1 Department of Physics, Boston University, Boston, MA 02215, U.S.A.

2 Department of Physics, Johns Hopkins University, Baltimore, MD 21218, U.S.A.

Dates

  1. Received 17 May 2007
  2. Accepted 9 August 2007
  3. Published

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1126-6708/2007/08/077

Abstract

Inspired by the AdS/CFT correspondence, we study the pseudoscalar mesons of QCD through a dual embedding in a strongly curved extra dimensional spacetime. This model incorporates the consequences of symmetry and has very few free parameters, due to constraints from five-dimensions and the operator product expansion of QCD. Using as inputs fπ and the pion, kaon, and rho masses, we compute the eta and eta prime masses to be 520 and 867 MeV, respectively. Their decay rates into photons are also computed and found to be in good agreement with data.

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10.1088/1126-6708/2007/08/077