Abstract
Cross sections and differential distributions for Zγ production in association with two jets via vector boson fusion are presented at next-to-leading order in QCD. The leptonic decays of the Z boson with full off-shell effects and spin correlations are taken into account. The uncertainties due to different scale choices and pdf sets are studied. Furthermore, we analyze the effect of including anomalous quartic gauge couplings at NLO QCD.
Highlights
Calculational setupThe calculation method of the “Z γjj” and “Zνγjj” production follows closely the one of pp →
Focusing mainly on the charged leptonic channel
Cross sections and differential distributions for Zγ production in association with two jets via vector boson fusion are presented at next-to-leading order in QCD
Summary
The calculation method of the “Z γjj” and “Zνγjj” production follows closely the one of pp →. This allows us to factorize amplitudes into a QCD part and electroweak factors The latter contain the decay currents for V → + − and V → + −γ with V, V ∈ (Z, γ∗), and “leptonic tensors” for V V /W +W − → + −/γ/ + −γ, containing the scattering of the t-channel vector bosons connecting the quark lines. The neglected s-channel contributions only give a noticeable contribution to the real emission, leading to an increase at the few per mille level of the total NLO QCD cross section. They can be included within the VBFNLO package at NLO QCD, by adding the cross sections for triple electroweak boson production. The fraction of phase space points rejected is around the per mille level and the error induced by this procedure is negligible since the total virtual contributions, after analytic cancellation of infrared divergences, are at the level of a few per cent
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