Constraining holographic technicolor

TL;DR

This paper derives a new lower bound on the Peskin-Takeuchi S parameter in holographic technicolor models, showing that these models predict values incompatible with experimental electroweak data, thus challenging their viability.

Contribution

It provides a novel theoretical bound on the S parameter in a broad class of holographic technicolor models, constraining their parameter space.

Findings

Holographic models imply S>>0.2

The bound conflicts with electroweak measurements

Disfavors the considered models

Abstract

We obtain a new bound on the value of Peskin-Takeuchi S parameter in a wide class of bottom-up holographic models for technicolor. Namely, we show that weakly coupled holographic description in these models implies S>>0.2. Our bound is in conflict with the results of electroweak precision measurements, so it strongly disfavors the models we consider.