Pion form factors in holographic QCD

Herry J. Kwee, Richard Lebed

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Abstract

Using a holographic dual model of QCD, we compute the pion electromagnetic form factor F π(Q 2) in the spacelike momentum transfer region, as well as pion couplings to vector mesons g ρ(n)ππ. Spontaneous and explicit chiral symmetry breaking are intrinsic features of this particular holographic model. We consider variants with both ''hard-wall'' and ''soft-wall'' infrared cutoffs, and find that the F π(Q 2) data tend to lie closer to the hard-wall model predictions, although both are too shallow for large Q 2. By allowing the parameters of the soft-wall model (originally fixed by observables such as m ρ) to vary, one finds fits that tend to agree better with F π(Q 2). We also compute the pion charge radius r π 2 for a variety of parameter choices, and use the values of f (n) ρ, g ρ(n)ππ and m (n) ρ to observe the saturation of F π(0) by ρ poles.

Original languageEnglish (US)
Article number027
JournalJournal of High Energy Physics
Volume2008
Issue number1
DOIs
StatePublished - Feb 13 2008

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Keywords

  • Gauge-gravity correspondence
  • QCD

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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