$$ t\overline{t}b\overline{b} $$ at the LHC: on the size of corrections and b-jet definitions

A bstract We report on the calculation of next-to-leading order QCD corrections to production a $$ t\overline{t} t ¯ pair in association with two heavy-flavour jets. concentrate di-lepton decay channel at LHC \sqrt{s} s = 13 TeV. The computation is based pp ? e + ? ? ? \overline{\nu} ? b\overline{b}b\overline{b} b matrix elements and includes all resonant non-resonant diagrams, interferences off-shell effects top quark W gauge boson. As it customary for such studies, results are presented form inclusive differential fiducial cross sections. extensively investigate dependence our upon variation renormalisation factorisation scales parton distribution functions quest an accurate estimate theoretical uncertainties. additionally study impact contributions induced by bottom-quark density. Results here particularly relevant measurements t\overline{t}H H ( H b\overline{b} ) determination Higgs coupling quark. In addition, they might be used precise top-quark sections modelling LHC.