Four lepton production and the accuracy of QED FSR

Abstract

We scrutinise the ability of the primary QED final-state resummation tools, combined with electroweak virtual corrections, to reproduce the exact next-to-leading order electroweak calculation in the four-charged-lepton final state. We further examine the dependence of the findings on the lepton-photon dressing-cone size as well as the resonance identification strategy. Overall we find excellent agreement with the fixed-order result, but partial differences not directly connected with resummation-induced higher-order effects at the few-percent level are observed in some cases, which are relevant for precision measurements.

22 pages, 13 figures, published version

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• Radiative corrections and Monte Carlo tools for low-energy hadronic cross sections in $e^{+}{e}^{-}$ collisions
• Logarithmic EW corrections at one-loop
• Photon splitting corrections to soft-photon resummation
• Observation of the J/$\psi$ $\to$ ${\mu }^{+}{\mu }^{-}{\mu }^{+}{\mu }^{-}$ decay in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Evaluation of Photos Monte Carlo ambiguities in case of four fermion final states
• Study of $Z\to ll\gamma$ decays at $\sqrt{s}$= 8 TeV with the ATLAS detector