QCD NLO predictions to $W$-pair production in association with a massive (anti)bottom-jet at the LHC

Abstract

The $W$-pair production in association with a massive (anti)bottom jet is not only an important background to a number of interesting processes, such as the single top production associated with a W boson, but also a potential background to new physics searches. We present the calculations of the total and differential cross sections for the $W^{+}{W}^{-}+b(\bar{b})$ jet productions at the LHC up to the QCD next-to-leading order (NLO). Our results by adopting the QCD NLO contribution collection scheme-I show that the K factors can be 1.66 and 1.21 with the inclusive and exclusive two-jet event selection schemes respectively, when we set $m_H=120GeV$, $\mu =m_W+m_b/2$ and take the constraints of $p_{T,b(\bar{b})}>25GeV$, $|y_{b(\bar{b})}|<2.5$ for $b(\bar{b})$ jet. We find that the stabilization of the theoretical prediction for the integrated cross section for the $pp\to W^{+}{W}^{-}b(\bar{b})+X$ up to the QCD NLO requires a veto on a second isolated hard jet and the inclusion of the QCD NLO contribution from the $W^{+}{W}^{-}b\bar{b}(bb,\bar{b}\bar{b})$ production with the final two $b(\bar{b})$ quarks being merged as one jet.

Comments: Published version in PRD