Search for dark matter in association with an energetic photon in pp collisions at $$ \sqrt{s} $$ = 13 TeV with the ATLAS detector

Abstract

A search for dark matter is conducted in final states containing a photon and missing transverse momentum in proton-proton collisions at $$ \sqrt{s} $$ s = 13 TeV. The data, collected during 2015–2018 by the ATLAS experiment at the CERN LHC, correspond to an integrated luminosity of 139 fb−1. No deviations from the predictions of the Standard Model are observed and 95% confidence-level upper limits between 2.45 fb and 0.5 fb are set on the visible cross section for contributions from physics beyond the Standard Model, in different ranges of the missing transverse momentum. The results are interpreted as 95% confidence-level limits in models where weakly interacting dark-matter candidates are pair-produced via an s-channel axial-vector or vector mediator. Dark-matter candidates with masses up to 415 (580) GeV are excluded for axial-vector (vector) mediators, while the maximum excluded mass of the mediator is 1460 (1470) GeV. In addition, the results are expressed in terms of 95% confidence-level limits on the parameters of a model with an axion-like particle produced in association with a photon, and are used to constrain the coupling gaZγ of an axion-like particle to the electroweak gauge bosons.

Sensitivity of future linear $$\hbox {e}^+\hbox {e}^-$$ colliders to processes of dark matter production with light mediator exchange

“…The strategy employed by ATLAS and CMS is to show exclusion limits in the DM mass versus mediator mass plane for selected benchmark scenarios proposed in [16]. For light DM states, results from the ATLAS collaboration [17], looking for the dark matter production in association with an energetic photon at √ s = 13 TeV, exclude mediator masses up to 920−1470 GeV, depending on the scenario. However, scenarios [16] assume relatively strong mediator coupling to quarks, g qqY = 0.1 or 0.25.…”

Nonresonant Searches for Axion-Like Particles in Vector Boson Scattering Processes at the LHC

“…[16]. Compared to the latter, we add constraints on g aγZ from the most recent mono-γ searches by the ATLAS Collaboration [62] (labeled "Z → γ + inv. (LHC)"), constraints on g aγγ from resonant lightby-light scattering γγ → a → γγ measured in Pb-Pb collisions by both CMS and ATLAS [63,64] (labeled "Light-by-light (LHC)") and constraints on all EW couplings from nonresonant searches in diboson production via gluon fusion at the LHC (labeled "Nonresonant ggF").…”

$Z^\prime$-mediated Majorana dark matter: suppressed direct-detection rate and complementarity of LHC searches

“…B. Monojet searches at the LHC Model-independent searches for DM at the LHC are primarily performed via monojet [10,11] and monophoton analyses [30,31], which can be interpreted in the context of simplified DM models, see Refs. [12][13][14], with the monojet final state typically providing the stronger limits.…”