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Resonances hunting at collider experiments is a powerful method to test the standard model and to search for hint of new physics. In this seminar I will focus on the search for low mass resonances in $b$-jets final states. I will briefly present the current state of art and I will report the new results from the CDF II experiment, obtained with a data set that has never been analyzed before. The data sample corresponds to 5.4 fb$^{-1}$ of integrated luminosity collected using a single b tagging jet trigger. A data-driven procedure is used to estimate the mass spectrum of the nonresonant multijet background. The measurement of the production cross-section of the Z boson decaying into $b\bar{b}$ pairs, the first upper limit on the inclusive $p\bar{p} \to H \to b\bar{b}$ process and the most stringent upper limit on the production of a Higgs-like particle produced in association with a $b$ quark at the Tevatron will be discussed.

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