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Soft Pomeron in holographic QCD

Alfonso Ballon-Bayona1, Robert Carcassés Quevedo1, Miguel S. Costa1,2, and Marko Djurić1

  • 1Centro de Física do Porto e Departamento de Física e Astronomia da Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal
  • 2Theory Division, Department of Physics, CERN, CH-1211 Genève 23, Switzerland

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Phys. Rev. D 93, 035005 – Published 4 February, 2016

DOI: https://doi.org/10.1103/PhysRevD.93.035005

Abstract

We study the graviton Regge trajectory in holographic QCD as a model for high energy scattering processes dominated by soft-Pomeron exchange. This is done by considering spin J fields from the closed string sector that are dual to glueball states of even spin and parity. In particular, we construct a model that governs the analytic continuation of the spin J field equation to the region of real J<2, which includes the scattering domain of the negative Maldelstam variable t. The model leads to approximately linear Regge trajectories and is compatible with the measured values of 1.08 for the intercept and 0.25  GeV−2 for the slope of the soft Pomeron. The intercept of the secondary Pomeron trajectory is in the same region of the subleading trajectories, made of mesons, proposed by Donnachie and Landshoff, and should therefore be taken into account.

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References (23)

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Phys. Rev. D 93, 035005– Published 4 February, 2016
  • Received 18 September 2015
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