Abstract
AbstractWe use aMC@NLO to predict theℓν + 2-jet cross section at the NLO accuracy in QCD matched to parton shower simulations. We find that the perturbative expansion is well behaved for all the observables we study, and in particular for those relevant to the experimental analyses. We therefore conclude that NLO corrections to this process cannot be responsible for the excess of events in the dijet invariant mass observed by the CDF collaboration.
Highlights
Method and validationThe W jj NLO cross section receives contributions from processes with W +2-parton and W +3-parton final states; these diverge when independently integrated over the
In order to obtain predictions that are both accurate and employable in experimental analyses, an NLO calculation needs to be consistently matched to a PSMC
We conclude that NLO corrections to this process cannot be responsible for the excess of events in the dijet invariant mass observed by the CDF collaboration
Summary
The W jj NLO cross section receives contributions from processes with W +2-parton and W +3-parton final states; these diverge when independently integrated over the. Things are significantly more complicated when one matches matrix-element computations with parton showers; the latter will generally increase the final-state multiplicities w.r.t. those relevant to short-distance cross sections, and the relationship between the quantities being cut at the generation and analysis level becomes blurred. The short-distance cross sections defined with these cuts are used to obtain unweighted events as customary in MC@NLO Such events are showered by HERWIG, and the resulting hadronic final states are used to reconstruct about sixty observables (involving leptons, jets, lepton-jet, and jet-jet correlations) for each of the two generation pT cuts mentioned above. We have verified that this is the case, by considering several different scale choices in a neighbourhood of the partonic, Born-level, c.m. energy
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