Anomalous couplings in $Z\gamma$ events at NNLO+PS and improving $\nu \bar{\nu }\gamma$ backgrounds in dark-matter searches

Abstract

The measurement of the triple gauge couplings (TGCs) is a central part of diboson studies at the LHC. In this letter we consider the $Z\gamma$ process and include anomalous TGCs (aTGCs) in the event generation at next-to-next-to-leading order QCD accuracy (NNLO+PS) within the MiNNLO${}_{\mathrm{PS}}$ framework. While our implementation is fully general and applies to both $Z\to {\ell }^{+}{\ell }^{-}$ and $Z\to \nu \bar{\nu }$ decays, we focus here on the $\nu \bar{\nu }\gamma$ final state. After validation of our simulation of $\nu \bar{\nu }\gamma$ events, for which NNLO+PS accuracy is achieved for the first time, the effects of aTGCs on various distributions are studied. Moreover, we show the relevance of NNLO+PS accuracy for the $\nu \bar{\nu }\gamma$ background to photon plus missing energy signatures in dark-matter searches, and we compare MiNNLO${}_{\mathrm{PS}}$ predictions for $\nu \bar{\nu }\gamma$ production to recent 13 TeV data.

17 pages, 5 figures, 3 tables

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• Les Houches 2021: Physics at TeV Colliders: Report on the Standard Model Precision Wishlist
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• Next-to-next-to-leading order event generation for $VH$ production with $H\to b\bar{b}$ decay
• B-hadron production at the LHC from bottom-quark pair production at NNLO+PS
• NNLO+PS Monte Carlo simulation of photon pair production with MiNNLOPS
• Higgs-boson production in the full theory at NNLO+PS
• Search for the anomalous $ZZZ$ and $ZZ\gamma$ gauge couplings through the process $e^{+}{e}^{-}\to ZZ$ with unpolarized and polarized beams
• Next-to-next-to-leading order event generation for $t\bar{t}H$ production with approximate two-loop amplitude
• NNLO QCD predictions of the asymmetry probe of the $Z\gamma$ pair-production process