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arXiv · 1105.4185

Holographic Walking Technicolor from D-branes

Lilia Anguelova·Peter Suranyi·L. C. Rohana Wijewardhana
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Abstract

We investigate a model of dynamical electroweak symmetry breaking via a dual gravitational description. The gravity dual is obtained by embedding a D7 - anti-D7 pair of branes into a type IIB background that is dual to a walking gauge theory. We develop further a previous study of this model. In particular, we show that there is a nontrivial relation that needs to be satisfied in order for axial-vector modes to exist. Furthermore, we compute explicitly the electroweak S parameter. The result is positive-definite and, as was to be expected, much smaller than in earlier QCD-like D-brane constructions. We also find the masses and decay constants of the vector and axial-vector mesons in this model. This allows us to obtain another estimate for S by summing the contributions of the discrete states. It is noteworthy that, in contrast to previous holographic studies, the sum of the first several lowest-lying states does give a very good approximation to the full answer.

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Lilia Anguelova, Peter Suranyi, L. C. Rohana Wijewardhana. 2011-05-20. Holographic Walking Technicolor from D-branes. https://doi.org/10.1016/j.nuclphysb.2011.06.010

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