Search for resonances below 1.2 TeV from the mass distribution of $b$-jet pairs in proton-proton collisions at $\sqrt{s}$=13 TeV with the ATLAS detector

Searches for resonances using the dijet invariant mass spectrum with two jets identified as $b$-jets are performed with the ATLAS detector at the Large Hadron Collider. The dataset consists of an integrated luminosity of 3.2 fb$^{-1}$ of proton-proton collisions at a centre-of-mass energy of $\sqrt{s} = 13$~TeV. The dijet mass distribution from 0.57~TeV to 1.2~TeV is studied. No significant deviations from the Standard Model expectation have been observed in the data. These results are used to exclude $Z'$ bosons at the 95% credibility level in the inspected mass range. Contributions of a Gaussian shaped signal with visible cross sections ranging from approximately 0.3 to 0.02 pb are also excluded.