Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-05-23
Phys.Rev.D75:106004,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages, 1 figure. Typos fixed, references added, improved discussion. Minor changes to match the journal version
Scientific paper
10.1103/PhysRevD.75.106004
We reassess a work done by Migdal on the spectrum of low-energy vector mesons in QCD in the light of the AdS-QCD correspondence. Recently, a tantalizing parallelism was suggested between Migdal's work and a family of holographic duals of QCD. Despite the intriguing similarities, both approaches face a major drawback: the spectrum is in conflict with well-tested Regge scaling. However, it has recently been shown that holographic duals can be modified to accomodate Regge behavior. Therefore, it is interesting to understand whether Regge behavior can also be achieved in Migdal's approach. In this paper we investigate this issue. We find that Migdal's approach, which is based on a modified Pade approximant, is closely related to the issue of quark-hadron duality breakdown in QCD.
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