\begin{document}$m_W$\end{document}. The favored oblique parameters originate from either the large mass splitting in the multiplet via the loop contribution or the large vacuum expectation value, which breaks custodial symmetry at the tree level. In particular, we find that \begin{document}$\mathcal{O}(100)$\end{document} GeV new particles are allowed in the scalar extension scenarios."> Custodial symmetry violation in scalar extensions of the standard model -
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