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Rare decays \(B\rightarrow M\nu\bar{\nu}\) in the \(TC2\) model and the \(LHT\) model. (English) Zbl 1204.81191

Summary: 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 \(B\rightarrow M\nu\bar{\nu}\) with \(M=\pi\), \(K\), \(\rho \), or \(K^{*}\). 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.

MSC:

81V22 Unified quantum theories
81T99 Quantum field theory; related classical field theories
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