The holographic life of the η′
In the string holographic dual of large-Nc QCD with N f flavours of [1], the η′ meson is massless at infinite Nc and dual to a collective fluctuation of Nf D6-brane probes in a supergravity background. Here we identify the string diagrams responsible for the generation of a mass of order Nf/Nc, cons...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2004 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/343644 |
| Acceso en línea: | http://hdl.handle.net/10261/343644 https://api.elsevier.com/content/abstract/scopus_id/22144489159 |
| Access Level: | acceso abierto |
| Palabra clave: | 1/N Expansion AdS-CFT and dS-CFT Correspondence D-branes |
| Sumario: | In the string holographic dual of large-Nc QCD with N f flavours of [1], the η′ meson is massless at infinite Nc and dual to a collective fluctuation of Nf D6-brane probes in a supergravity background. Here we identify the string diagrams responsible for the generation of a mass of order Nf/Nc, consistent with the Witten-Veneziano formula, and show that the supergravity limit of these diagrams corresponds to mixings with pseudoscalar glueballs. We argue that the dependence on the θ-angle in the supergravity description occurs only through the combination θ + 2√Nfη′/ fπ, as dictated by the U(1)A anomaly. We provide a quantitative test by computing the linear term in the η′ potential in two independent ways, with perfect agreement. © SISSA/ISAS 2004. |
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