Measurement of the W boson production cross section in association with two b jets in pp collisions at $\sqrt{s} = 8$ TeV

The production cross section of the W boson in association with two b jets is measured using a sample of proton-proton collisions collected by the CMS experiment at the LHC at $\sqrt{s} = 8$ TeV. The data sample corresponds to an integrated luminosity of 19.8 fb$^{-1}$. The W bosons are reconstructed via their leptonic decays to muons ($\mathrm{W}\rightarrow\mu\nu$) and electrons ($\mathrm{W}\rightarrow\mathrm{e}\nu$). The W+b$\bar{\mathrm{b}}$ production cross section, $\sigma ( {\mathrm{pp}} \rightarrow {\mathrm{W}} (\ell\nu)+\mathrm{b}\bar{\mathrm{b}})= 0.69 \pm 0.02 \mathrm{(stat)} \pm 0.11 \mathrm{(syst)} \pm 0.07 \mathrm{(theo)} \pm 0.02 \mathrm{(lumi)} ~\mathrm{pb}$, measured in a fiducial region, $p_T^{\ell}>30$ GeV, $|\eta^{\ell}|<2.1$, with exactly two b-tagged jets having $p_{\mathrm{T}}>25$ GeV and $|\eta|<2.4$, agrees with standard model predictions.