Tripling down on the W boson mass

Abstract A new precision measurement of the W boson mass has been announced by CDF collaboration, which strongly deviates from Standard Model prediction. In this article, we study implications on parameter space $$SU(2)_L$$ S U ( 2 ) L triplet extension (with hypercharge $$Y=1$$ Y = 1 ) Higgs sector, focusing a limit where is approximate $${\mathbb {Z}}_2$$ Z -odd while SM -even. We compatibility spectrum preferred measured CDF-II experiment with other electroweak observables and data. comprehensively consider signals states at LHC highlighted promising search channels. addition, also investigate cosmological case in lightest particle either late decaying or cosmologically stable.