Rare decays B\to M\nu\bar{\nu} in the TC2 model and the LHT model

TL;DR

This paper compares the effects of the TC2 and LHT models on rare B meson decays into mesons and neutrinos, finding that TC2 predicts larger branching ratios and can be constrained by experimental data.

Contribution

It provides a comparative analysis of TC2 and LHT models' impacts on rare B decays, highlighting the stronger effects of TC2 and the potential to constrain its parameters.

Findings

TC2 model predicts larger branching ratios than LHT.

Experimental limits impose constraints on TC2 parameters.

The study enhances understanding of new physics effects in rare B decays.

Abstract

In the framework of the topcolor-assisted technicolor ($TC2$) model and the littlest Higgs model with $T$-parity ($LHT$ model), we consider the rare B decays $B\to M\nu\bar{\nu}$ with $M=\pi,K,\rho,$ or $K^{\ast}$. We find that the contributions of the $TC2$ model to the branching ratios of these decay processes are larger than those for the $LHT$ model. The experimental upper limits for some branching ratios can give severe constraints on the free parameters of the $TC2$ model.