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 language | English (US) |
|---|---|
| Article number | 115007 |
| Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |
| Volume | 77 |
| Issue number | 11 |
| DOIs | |
| State | Published - Jun 11 2008 |
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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 journal › Article
}
TY - JOUR
T1 - Pion form factor in improved holographic QCD backgrounds
AU - Kwee, Herry J.
AU - Lebed, Richard
PY - 2008/6/11
Y1 - 2008/6/11
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=45249083833&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=45249083833&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.77.115007
DO - 10.1103/PhysRevD.77.115007
M3 - Article
AN - SCOPUS:45249083833
VL - 77
JO - Physical review D: Particles and fields
JF - Physical review D: Particles and fields
SN - 1550-7998
IS - 11
M1 - 115007
ER -