Abstract
We present a next-to-leading order plus parton-shower event generator for the production of a W boson plus two bottom quarks and a jet at hadron colliders, implemented in the POWHEG BOX framework. Bottom-mass effects and spin correlations of the decay products of the W boson are fully taken into account. The code has been automatically generated using the two available interfaces to MadGraph4 and GoSam, the last one updated to a new version. We have applied the MiNLO prescription to our Wbbj calculation, obtaining a finite differential cross section also in the limit of vanishing jet transverse momentum. Furthermore, we have compared several key distributions for Wbbj production with those generated with a next-to-leading order plus parton-shower event generator for Wbb production, and studied their factorization- and renormalization-scale dependence. Finally, we have compared our results with recent experimental data from the ATLAS and CMS Collaborations.
Highlights
Wbb production at next-to-leading order (NLO) in QCD has been studied for a while [4,5,6,7,8]
Bottom-mass effects and spin correlations of the leptonic decay products of the W boson have been fully taken into account
The production of a W boson in association with one or more b jets is a significant background for HW production, with the Higgs boson decaying into b quarks, and to single-top and top-pair production in the Standard Model and to many new-physics searches
Summary
When performing a fixed-order calculation with massive quarks, one can define two consistent renormalization schemes that describe the same physics: the usual MS scheme, where all flavours are treated on equal footing, and a mixed scheme [36], that we call decoupling scheme, in which the nlf light flavours are subtracted in the MS scheme, while the heavyflavour loop is subtracted at zero momentum. To make contact with other results expressed in terms of the MS strong coupling constant, running with 5 light flavours, and with pdfs with 5 flavours, we prefer to change our renormalization scheme and to switch to the MS one The procedure for such a switch is well known, and was discussed in ref. Where Bqq and Bqg are the squared Born amplitude for the corresponding initial states, μR and μF are the renormalization and factorization scale, respectively, and mb is the bottom-quark mass
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
