Constraining walking and custodial technicolor

MCRG Minimal Walking Technicolor

The Vertex Corrections in Technicolor Model without Exact Custodial Symmetry

We discuss the effects of isospin breaking which appear in the vertex corrections for Zbb̄, Zττ and Wντ in a one-family technicolor model without exact custodial symmetry. By means of the effective lagrangian approach we compute the vertex corrections for Zbb̄, Zττ and Wτν taking account of the contributions from technivectormesons. If the isospin symmetry in technilepton sector is not exact, tec...

Composite Scalars at LEP: Constraining Technicolor Theories

LEP I and LEP II data can be used to constrain technicolor models with light, neutral pseudo-NambuGoldstone bosons, P. We use published limits on branching ratios and cross sections for final states with photons, large missing energy, jet pairs, or bb pairs to constrain the anomalous PZZ, PZγ, and Pγγ couplings. From these results, we derive bounds on the size of the technicolor gauge group and...

Walking Technicolor and Electroweak Radiative Corrections

We examine the effect of walking technicolor dynamics on the electroweak S parameter and contrast it with the effect of QCD-like technicolor dynamics. Our main tools are the operator product expansion for the high-momentum behavior of the electroweak gauge boson vacuum polarizations and the analyticity of these polarizations which relate their low and high momentum behaviors. We show that where...

Walking Technicolor and the Zbb̄ Vertex

A slowly-running technicolor coupling will affect the size of nonoblique corrections to the Zbb̄ vertex from extended technicolor dynamics. We show that while “walking technicolor” reduces the magnitude of the corrections, they generally remain large enough to be seen at LEP. BUHEP-93-11 EFI-93-27 HUTP-93/A012 YCTP-P10-93 hep-ph/9305232 Electronic mail addresses: [email protected], gates@tyrone...