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$W^{\pm} Z$ production at the LHC: fiducial cross sections and distributions in NNLO QCD


Grazzini, Massimiliano; Kallweit, Stefan; Rathlev, Dirk; Wiesemann, Marius (2017). $W^{\pm} Z$ production at the LHC: fiducial cross sections and distributions in NNLO QCD. Journal of High Energy Physics, 2017(5):139.

Abstract

We report on the first fully differential calculation for $W^{\pm} Z$ production in hadron collisions up to next-to-next-to-leading order (NNLO) in QCD perturbation theory. Leptonic decays of the W and Z bosons are consistently taken into account, i.e. we include all resonant and non-resonant diagrams that contribute to the process $pp \to \ell^{\prime\pm}ν_{\ell}\prime\ell^+\ell^- + X$ both in the same-flavour ($\ell^{\prime} = \ell$) and the different-flavour ($\ell^{\prime} \neq \ell$) channel. Fiducial cross sections and distributions are presented in the presence of standard selection cuts applied in the experimental $W^{\pm} Z$ analyses by ATLAS and CMS at centre-of-mass energies of 8 and 13 TeV. As previously shown for the inclusive cross section, NNLO corrections increase the NNLO result by about 10%, thereby leading to an improved agreement with experimental data. The importance of NNLO accurate predictions is also shown in the case of new-physics scenarios, where, especially in high-$p_T$ categories, their impact can reach $\mathcal{O}(20%)$. The availability of differential NNLO predictions will play a crucial role in the rich physics programme that is based on precision studies of $W^{\pm} Z$ signatures at the LHC.

Abstract

We report on the first fully differential calculation for $W^{\pm} Z$ production in hadron collisions up to next-to-next-to-leading order (NNLO) in QCD perturbation theory. Leptonic decays of the W and Z bosons are consistently taken into account, i.e. we include all resonant and non-resonant diagrams that contribute to the process $pp \to \ell^{\prime\pm}ν_{\ell}\prime\ell^+\ell^- + X$ both in the same-flavour ($\ell^{\prime} = \ell$) and the different-flavour ($\ell^{\prime} \neq \ell$) channel. Fiducial cross sections and distributions are presented in the presence of standard selection cuts applied in the experimental $W^{\pm} Z$ analyses by ATLAS and CMS at centre-of-mass energies of 8 and 13 TeV. As previously shown for the inclusive cross section, NNLO corrections increase the NNLO result by about 10%, thereby leading to an improved agreement with experimental data. The importance of NNLO accurate predictions is also shown in the case of new-physics scenarios, where, especially in high-$p_T$ categories, their impact can reach $\mathcal{O}(20%)$. The availability of differential NNLO predictions will play a crucial role in the rich physics programme that is based on precision studies of $W^{\pm} Z$ signatures at the LHC.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:May 2017
Deposited On:15 Feb 2018 10:32
Last Modified:20 Sep 2018 04:28
Publisher:Springer
ISSN:1029-8479
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1007/JHEP05(2017)139

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