Observation of $H \to bb$ in ATLAS

The measurements of the Higgs boson decays to fermions allow to test the Yukawa couplings and to understand the mass generation of fermions. In the Standard Model, the $H$$\rightarrow$ $b$$\bar{b}$ decay is the dominating decay with a branching ratio of 58%, although its observation is experimentally challenging at LHC because of the large multijet background. The search for the $H$$\rightarrow$ $b$$\bar{b}$ decay is therefore performed exploiting the associated production of a Higgs boson with a $W$ or a $Z$ boson ($V$ = $W/Z$), whose leptonic decays make the signature of these processes easier to identify. This paper describes the search for the $VH$($\rightarrow$ $b$$\bar{b}$) process using $pp$ collisions data taken by ATLAS at LHC at 13TeV and presents the first observation of the Higgs coupling to $b$-quarks. Differential cross section of the $VH$($\rightarrow$ $b$$\bar{b}$) production at 13TeV are also presented.