Effective String Theory and QCD Scattering Amplitudes

Details Effective String Theory and QCD Scattering Amplitudes Effective String Theory and QCD Scattering Amplitudes

2010-12-03

arxiv.org/abs/1012.0708v3

Phys.Rev.D83:026007,2011

Physics

High Energy Physics

High Energy Physics - Theory

24pp., 1 figure; v2: 1 reference & 1 acknowledgment added; v3: to appear in PRD

Scientific paper

10.1103/PhysRevD.83.026007

QCD string is formed at the distances larger than the confinement scale and can be described by the Polchinski--Strominger effective string theory with a nonpolynomial action, which has nevertheless a well-defined semiclassical expansion around a long-string ground state. We utilize modern ideas about the Wilson-loop/scattering-amplitude duality to calculate scattering amplitudes and show that the expansion parameter in the effective string theory is small in the Regge kinematical regime. For the amplitudes we obtain the Regge behavior with a linear trajectory of the intercept (d-2)/24 in d dimensions, which is computed semiclassically as a momentum-space Luscher term, and discuss an application to meson scattering amplitudes in QCD.

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