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arXiv · hep-th/0312071

Quarkonium from the Fifth Dimension

Sungho Hong·Sukjin Yoon·Matthew J. Strassler
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Abstract

Adding fundamental matter of mass m_Q to N=4 Yang Mills theory, we study quarkonium, and "generalized quarkonium" containing light adjoint particles. At large 't Hooft coupling the states of spin<=1 are anomalously light (Kruczenski et al., hep-th/0304032). We examine their form factors, and show these hadrons are unlike any known in QCD. By a traditional yardstick they appear infinite in size (as with strings in flat space) but we show that this is a failure of the yardstick. All of the hadrons are actually of finite size ~ \sqrt{g^2N}/m_Q, regardless of their radial excitation level and of how many valence adjoint particles they contain. Certain form factors for spin-1 quarkonia vanish in the large-g^2N limit; thus these hadrons resemble neither the observed J/Psi quarkonium states nor rho mesons.

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Sungho Hong, Sukjin Yoon, Matthew J. Strassler. 2004-03-20. Quarkonium from the Fifth Dimension. https://doi.org/10.1088/1126-6708%2F2004%2F04%2F046

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