## Measurement of $$b$$-hadron pair production with the ATLAS detector in proton-proton collisions at $$\sqrt{s}=8$$ TeV

Please always quote using this URN: urn:nbn:de:bvb:20-opus-172414

• A measurement of $$b$$-hadron pair production is presented, based on a data set corresponding to an integrated luminosity of 11.4 fb$$^{−1}$$ of proton-proton collisions recorded at $$\sqrt{s}=8$$ TeV with the ATLAS detector at the LHC. Events are selected in which a $$b$$-hadron is reconstructed in a decay channel containing $$J/ψ → μμ$$, and a second $$b$$-hadron is reconstructed in a decay channel containing a muon. Results are presented in a fiducial volume defined by kinematic requirements on three muons based on those used in theA measurement of $$b$$-hadron pair production is presented, based on a data set corresponding to an integrated luminosity of 11.4 fb$$^{−1}$$ of proton-proton collisions recorded at $$\sqrt{s}=8$$ TeV with the ATLAS detector at the LHC. Events are selected in which a $$b$$-hadron is reconstructed in a decay channel containing $$J/ψ → μμ$$, and a second $$b$$-hadron is reconstructed in a decay channel containing a muon. Results are presented in a fiducial volume defined by kinematic requirements on three muons based on those used in the analysis. The fiducial cross section is measured to be 17.7 ± 0.1(stat.) ± 2.0(syst.) nb. A number of normalised differential cross sections are also measured, and compared to predictions from the PHYTHIA8, HERWIG++, MADGRAPH5_AMC@NLO+PYTHIA8 and SHERPA event generators, providing new constraints on heavy flavour production.