منابع مشابه
Running Gauge Couplings and Thresholds in the Type II Superstring
A distinctive feature of string unification is the possibility of unification by a nonsimply-laced group. This occurs most naturally in four dimensional type II string models where the gauge symmetry is realized by Kac-Moody algebras at different levels. We investigate the running coupling constants and the one-loop thresholds for such general models. As a specific case, we examine a SU(3) × U(...
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We derive the T–duality transformations that transform a general d = 10 solution of the type–IIA string with one isometry to a solution of the type–IIB string with one isometry and vice versa. In contrast to other superstring theories, the T–duality transformations are not related to a non-compact symmetry of a d = 9 supergravity theory. We also discuss S–duality in d = 9 and d = 10 and the rel...
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If the exotic baryon Θ(1540) is udud¯ s with J P = 1 2 + , we predict that there is a Θ * (1540− 1680) with J P = 3 2 +. The width Γ(Θ * → KN) is at least a factor of three larger than Γ(Θ). The possibilities of Θ * → KN π or Θγ via M 1 and E2 multipoles are discussed. A major plank in establishing the constituent quark model was the absence of baryons with strangeness +1. The announcement of s...
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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 Ref. [1] 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 st...
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ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2013
ISSN: 1029-8479
DOI: 10.1007/jhep07(2013)123