Abstract
We perform a phenomenological study of Z plus jet, Higgs plus jet and di-jet production at the Large Hadron Collider. We investigate in particular the dependence of the leading jet cross section on the jet radius as a function of the jet transverse momentum. Theoretical predictions are obtained using perturbative QCD calculations at the next-to and next-to-next-to-leading order, using a range of renormalization and factorization scales. The fixed order predictions are compared to results obtained from matching next-to-leading order calculations to parton showers. A study of the scale dependence as a function of the jet radius is used to provide a better estimate of the scale uncertainty for small jet sizes. The non-perturbative corrections as a function of jet radius are estimated from different generators.
Highlights
In the past few years, the state of the art in QCD perturbation theory has advanced considerably
Next-to-leading order accurate results have been available for some time [16,17,18]. They can be computed in an automatic fashion using general-purpose event generators [19,20,21,22,23,24,25,26,27] and the matching to parton showers can be carried out with a number of different approaches [28,29]
The latter two reactions are important for global parton distribution functions (PDFs) fits, where only fixed order predictions have been used so far, and it is important to understand the possible impact of resummation effects
Summary
In the past few years, the state of the art in QCD perturbation theory has advanced considerably. A contribution to the Les Houches 2017 workshop compared predictions for H+j production at LO, NLO and NNLO to those from parton-shower matched NLO calculations using different event generators, for a variety of jet radii [33]. The goal for this comparison was multi-fold: using identical boundary conditions, to check the consistency of the matched
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