Tree scattering amplitudes of the spin-4/3 fractional superstring II: the twisted sectors

Details Tree scattering amplitudes of the spin-4/3 fractional superstring II: the twisted sectors Tree scattering amplitudes of the spin-4/3 fractional superstring II: the twisted sectors

1993-11-22

arxiv.org/abs/hep-th/9311131v1

Phys.Rev. D49 (1994) 5349-5363

Physics

High Energy Physics

High Energy Physics - Theory

28 pages, 2 figures, Revtex 3.0, IASSNS-HEP-93/58, CLNS-93/1251

Scientific paper

10.1103/PhysRevD.49.5349

The spin-4/3 fractional superstring is characterized by a world-sheet chiral algebra involving spin-4/3 currents. The discussion of the tree-level scattering amplitudes of this theory presented in hepth/9310131 is expanded to include amplitudes containing two twisted-sector states. These amplitudes are shown to satisfy spurious state decoupling. The restriction to only two external twisted-sector states is due to the absence of an appropriate dimension-one vertex describing the emission of a single twisted-sector state. This is analogous to the ``old covariant'' formalism of ordinary superstring amplitudes in which an appropriate dimension-one vertex for the emission of a Ramond-sector state is lacking. Examples of tree scattering amplitudes are calculated in a c=5 model of the spin-4/3 chiral algebra realized in terms of free bosons on the string world-sheet. The target space of this model is three-dimensional flat Minkowski space-time and the twisted-sector physical states are fermions in space-time. Since the critical central charge of the spin-4/3 fractional superstring theory is 10, this c=5 model is not consistent at the string loop level.

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