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The European Physical Journal A

, Volume 31, Issue 4, pp 638–644 | Cite as

Hadron spectroscopy and structure from AdS/CFT

  • S. J. BrodskyEmail author
QNP 2006

Abstract.

The AdS/CFT correspondence between conformal field theory and string states in an extended space-time has provided new insights into not only hadron spectra, but also their light-front wave functions. We show that there is an exact correspondence between the fifth-dimensional coordinate of anti-de Sitter space z and a specific impact variable ζ which measures the separation of the constituents within the hadron in ordinary space-time. This connection allows one to predict the form of the light-front wave functions of mesons and baryons, the fundamental entities which encode hadron properties and scattering amplitudes. A new relativistic Schrödinger light-front equation is found which reproduces the results obtained using the fifth-dimensional theory. Since they are complete and orthonormal, the AdS/CFT model wave functions can be used as an initial ansatz for a variational treatment or as a basis for the diagonalization of the light-front QCD Hamiltonian. A number of applications of light-front wave functions are also discussed.

PACS.

12.38.-t Quantum chromodynamics 11.25.Tq Gauge/string duality 12.38.Aw General properties of QCD (dynamics, confinement, etc.)[ :AND:] 12.40.Nn Regge theory, duality, absorptive/optical models 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2007

Authors and Affiliations

  1. 1.Stanford Linear Accelerator CenterStanford UniversityStanfordUSA

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