Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-12-11
Phys.Rev.D77:115007,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages, 1 eps figure. This version, to appear in Phys. Rev. D, includes an extended discussion of the fit to the soft-wall m
Scientific paper
10.1103/PhysRevD.77.115007
We extend a recent numerical calculation of the pion electromagnetic form factor F_\pi (Q^2) 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, F_\pi$ for large Q^2 is shallower than data, an effect that can be cured by relaxing the fit to one of the static observables, particularly the decay constant f_\pi.
Kwee Herry J.
Lebed Richard F.
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