Abstract
We present a next-to-next-to-leading order accurate description of associated HW production consistently matched to a parton shower. The method is based on reweighting events obtained with the HW plus one jet NLO accurate calculation implemented in POWHEG, extended with the MiNLO procedure, to reproduce NNLO accurate Born distributions. Since the Born kinematics is more complex than the cases treated before, we use a parametrization of the Collins-Soper angles to reduce the number of variables required for the reweighting. We present phenomenological results at 13 TeV, with cuts suggested by the Higgs Cross Section Working Group.
Highlights
In ref. [10] the inclusive HV (V = W, Z) cross section was computed at NNLO
The precision required for LHC studies demands that at least the NLO corrections be included in such event generation tools, providing predictions where NLO effects are matched to parton showers (NLOPS)
In this paper we have used the MiNLO-based merging method to obtain the first NNLO accurate predictions for HW production consistently matched to a parton shower, including the decay of the W boson to leptons
Summary
A first consideration is that when using multi-differential distributions one needs to decide the number of bins in each distribution. We have simplified our procedure by noting that the m ν invariant mass distribution has a flat K-factor This is true even when examining the dσ/dm ν distribution in different bins of ΦHW = {yHW, ∆yHW, pt,H}. In eq (2.2) we replace ΦHW∗ with ΦHW and in eq (2.5) we integrate over m ν, meaning that instead of having four-dimensional distributions, we use three-dimensional ones [28], a reweighting of the form eq (2.1) spreads the NNLO/NLO K-factor uniformly, even in regions where the HW system has a large transverse momentum, i.e. a region that is described well by a pure NNLO HW calculation, or by the HWJ-MiNLO generator. On the contrary, when hard radiation is present, the transverse momentum of the leading jet becomes large, h(pT ) goes to zero, and W(ΦHW, pT ) goes to one
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