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NLO QCD+EW predictions for 2$\ell$2v diboson signatures at the LHC


Kallweit, S; Lindert, J M; Pozzorini, S; Schönherr, M (2017). NLO QCD+EW predictions for 2$\ell$2v diboson signatures at the LHC. Journal of High Energy Physics, 2017(11):120.

Abstract

We present next-to-leading order (NLO) calculations including QCD and electroweak (EW) corrections for 2$\ell$2ν diboson signatures with two opposite-charge leptons and two neutrinos. Specifically, we study the processes $pp \to e^+\mu^-\nu_e\overline{\nu}_{\mu}$ and $pp \to e^+e^-\nu\overline{\nu}$, including all relevant off-shell diboson channels, $W^+W^-, ZZ, \gamma Z$, as well as non-resonant contributions. Photon-induced processes are computed at NLO EW, and we discuss subtle differences related to the definition and the renormalisation of the coupling α for processes with initial- and final-state photons. All calculations are performed within the automated Munich/Sherpa+OpenLoops frameworks, and we provide numerical predictions for the LHC at 13 TeV. The behaviour of the corrections is investigated with emphasis on the high-energy regime, where NLO EW effects can amount to tens of percent due to large Sudakov logarithms. The interplay between $W$ $W $and $ZZ$ contributions to the same-flavour channel, $pp \to e^+e^-\nu\overline{\nu}$, is discussed in detail, and a quantitative analysis of photon-induced contributions is presented. Finally, we consider approximations that account for all sources of large logarithms, at high and low energy, by combining virtual EW corrections with a YFS soft-photon resummation or a QED parton shower.

Abstract

We present next-to-leading order (NLO) calculations including QCD and electroweak (EW) corrections for 2$\ell$2ν diboson signatures with two opposite-charge leptons and two neutrinos. Specifically, we study the processes $pp \to e^+\mu^-\nu_e\overline{\nu}_{\mu}$ and $pp \to e^+e^-\nu\overline{\nu}$, including all relevant off-shell diboson channels, $W^+W^-, ZZ, \gamma Z$, as well as non-resonant contributions. Photon-induced processes are computed at NLO EW, and we discuss subtle differences related to the definition and the renormalisation of the coupling α for processes with initial- and final-state photons. All calculations are performed within the automated Munich/Sherpa+OpenLoops frameworks, and we provide numerical predictions for the LHC at 13 TeV. The behaviour of the corrections is investigated with emphasis on the high-energy regime, where NLO EW effects can amount to tens of percent due to large Sudakov logarithms. The interplay between $W$ $W $and $ZZ$ contributions to the same-flavour channel, $pp \to e^+e^-\nu\overline{\nu}$, is discussed in detail, and a quantitative analysis of photon-induced contributions is presented. Finally, we consider approximations that account for all sources of large logarithms, at high and low energy, by combining virtual EW corrections with a YFS soft-photon resummation or a QED parton shower.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2017
Deposited On:01 Mar 2018 15:23
Last Modified:14 Mar 2018 18:03
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/JHEP11(2017)120

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