Walking technicolor signatures at hadron colliders

Aspects of the dynamics of walking technicolor models are expected to have important consequences for technihadron production at hadron colliders. Hard-mass enhancements characteristic of walking technicolor raise technipion (${\pi }_T$) masses relative to technirho (${\rho }_T$) masses so that the decays ${\rho }_T\to {\pi }_T{\pi }_T$ are either suppressed or forbidden altogether. Thus, ${\rho }_T$ can be unusually narrow with unconventional decay modes. Large weak isospin breaking in $U$- and $D$-technifermion masses (required for $t-b$ splitting) leads to neutral ${\rho }_T$ and ${\pi }_T$ that are ideally mixed. Finally, multiscale models of walking technicolor in which the light-scale technifermions carry ordinary SU(3) color can have color-octet ${\rho }_T\text{'}\mathrm{s}$ which are produced strongly in parton-parton collisions and are within reach of the Fermilab Tevatron. These would appear as narrow, well-separated ${\rho }_{\overline{D}D}$ and ${\rho }_{\overline{U}U}$ resonances in dijet production or in ${\pi }_T{\pi }_T$ production with a limited number of final states. These expectations are illustrated in a multiscale model containing both techniquarks and technileptons at the light scale. Depending on assumptions that determine the fundamental chiral-symmetry-breaking mass parameters of the model, we find two generic phenomenologies: (A) ${\rho }_{\overline{D}D}$ with a mass of 200-250 GeV decaying exclusively to dijets and ${\rho }_{\overline{U}U}$ in the mass range 350-550 GeV decaying to a few ${\pi }_T{\pi }_T$ combinations; (B) ${\rho }_{\overline{D}D}$ with a mass of 375-425 GeV and ${\rho }_{\overline{U}U}$ in the mass range 500-700 GeV both decaying to a few ${\pi }_T{\pi }_T$ modes. The ${\rho }_{\overline{D}D}\to \mathrm{dijet}$ signal of case A is large at all colliders and can be sought now at the Tevatron. The ${\pi }_T{\pi }_T$ production rates in both cases are of ∼10 pb at the Tevatron and ∼10 nb at the Superconducting Super Collider (SSC). The technipions can be sought in the next high-luminosity run of the Tevatron and may be excludable if backgrounds are not too severe. Experiments at the SSC certainly should be able to determine whether they exist.