Rare decays $B \to X_{s,d} \nu \bar \nu$ and $B_{s,d} \to l^+ l^-$ in the Topcolor-assisted Technicolor Model

TL;DR

This paper investigates how the Topcolor-assisted Technicolor Model influences rare B meson decays, finding that top-pions can significantly enhance decay ratios while technipions have minimal impact, aligning with experimental data.

Contribution

It provides a detailed calculation of new physics contributions to rare B decays within the Topcolor-assisted Technicolor framework, highlighting the role of top-pions and technipions.

Findings

Top-pions can enhance decay ratios by a factor of 10-30.

Technipions contribute less than 2% to the standard model prediction.

Model remains consistent with current experimental data.

Abstract

We calculate the contributions to the rare decays $B \to X_{s,d} \nu \bar \nu$ and $B_{s,d} \to l^+l^-$ from one-loop $Z^0$-penguin diagrams in the framework of Topcolor-assisted Technicolor Model. Within the parameter space, we find that: (a) the new contribution from technipions is less than 2% of the standard model prediction; (b) the top-pions can provide a factor of 10 to 30 enhancement to the ratios in question; (c) the topcolor-assisted technicolor model is consistent with the current experimental data.