Pion form factor in improved holographic QCD backgrounds

Herry J. Kwee, Richard Lebed

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

We extend a recent numerical calculation of the pion electromagnetic form factor Fπ(Q2) in holographic QCD to study two important issues regarding the behavior of fields in the bulk. First, we show that using a chiral symmetry-breaking field formally satisfying the boundary conditions of the "soft-wall" model changes numerical results very little from the earlier calculation that ignores these constraints. Second, we use a background field that interpolates between "hard-wall" and soft-wall models to obtain an improved model that reproduces the desirable phenomenological features of both. In all cases, Fπ for large Q2 is shallower than data, an effect that can be cured by relaxing the fit to one of the static observables, particularly the decay constant fπ.

Original languageEnglish (US)
Article number115007
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume77
Issue number11
DOIs
StatePublished - Jun 11 2008

Fingerprint

Form Factors
form factors
pions
quantum chromodynamics
Chiral Symmetry
Symmetry Breaking
Numerical Calculation
broken symmetry
Interpolate
Model
Decay
boundary conditions
electromagnetism
Boundary conditions
Numerical Results
decay
Background

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics
  • Mathematical Physics

Cite this

Pion form factor in improved holographic QCD backgrounds. / Kwee, Herry J.; Lebed, Richard.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 77, No. 11, 115007, 11.06.2008.

Research output: Contribution to journalArticle

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