Electromagnetic form factors from the fifth dimension
| dc.creator | Rodriguez-Gomez, D. | |
| dc.creator | Ward, J. | |
| dc.date | 2008-03-25 | |
| dc.date | 2008-04-08 | |
| dc.date.accessioned | 2026-07-07T11:49:19Z | |
| dc.date.available | 2026-07-07T11:49:19Z | |
| dc.description | We analyse various $U(1)_{EM}$ form factors of mesons at strong coupling in an $\mathcal{N}=2$ flavored version of $\mathcal{N}=4$ $SYM$ which becomes conformal in the UV. The quark mass breaks the conformal symmetry in the IR and generates a mass gap. In the appropriate limit, the gravity dual is described in terms of probe $D7$-branes in $AdS_5\times S^5$. By studying the $D7$ fluctuations we find the suitable terms in a "meson effective theory" which allow us to compute the desired form factors, namely the $γπρ$ and $γf_0ρ$ transition form factors. At large $q^2$ we find perfect agreement with the naive parton model counting, which is a consequence of the conformal nature of both QCD and our model in the UV. By using the same tools, we can compute the $γ^*γ^*π$ form factor. However this channel is more subtle and comparisons to the QCD result are more involved. | |
| dc.description | 34 pages, 6 figures, pdflatex. References and clarifications added | |
| dc.identifier | https://arxiv.org/abs/0803.3475 | |
| dc.identifier | http://arxiv.org/abs/0803.3475 | |
| dc.identifier | JHEP0809:103,2008 | |
| dc.identifier | doi:10.1088/1126-6708/2008/09/103 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/203194 | |
| dc.subject | High Energy Physics - Theory | |
| dc.title | Electromagnetic form factors from the fifth dimension | |
| dc.type | text |