Constraints on mediator-based dark matter and scalar dark energy models using $$ \sqrt{s} $$ = 13 TeV pp collision data collected by the ATLAS detector

Abstract

Constraints on mediator-based dark matter and scalar dark energy models using √ s = 13 TeV p p collision data collected by the ATLAS detectorThe ATLAS Collaboration Constraints on selected mediator-based dark matter models and a scalar dark energy model using up to 37 fb −1 √ s = 13 TeV pp collision data collected by the ATLAS detector at the LHC during 2015-2016 are summarised in this paper. The results of experimental searches in a variety of final states are interpreted in terms of a set of spin-1 and spin-0 single-mediator dark matter simplified models and a second set of models involving an extended Higgs sector plus an additional vector or pseudo-scalar mediator. The searches considered in this paper constrain spin-1 leptophobic and leptophilic mediators, spin-0 colour-neutral and colour-charged mediators and vector or pseudo-scalar mediators embedded in extended Higgs sector models. In this case, also √ s = 8 TeV pp collision data are used for the interpretation of the results. The results are also interpreted for the first time in terms of light scalar particles that could contribute to the accelerating expansion of the universe (dark energy).

Dark matter relic density from conformally or disformally coupled light scalars

“…In particular, around freeze-out, one obtains ffiffiffiffiffiffiffiffi s DM p ≃ 2m ψ=χ , and the corresponding bound reads M DM ≳ cm ψ=χ , where c depends on the value of g à . For the values of g à larger than the aforementioned limits used in the ATLAS study [62], but lower than 4π, one obtains 0.1 ≲ c ≲ 1. For simplicity, in the following, we require…”

“…A prominent role in these efforts is played by collider searches, especially at the LHC [57,61]. The most stringent such bounds based on 13 TeV LHC data have recently been published by the ATLAS Collaboration [62]. In particular, the results of the tt þ E miss…”

“…In the following, we adopt the effective bounds from Eqs. (13) and (14) that are relevant for g à ≳ π 2 or g à ≳ π for conformal and disformal couplings, respectively [62].…”

Lightening gravity-mediated dark matter

“…Then, dijet resonance + ISR photon [71] or jet [72,73] searches can constrain this case. In the presence of dark matter coupling to the spin-2 resonance, the invisible decay of the spin-2 particle with mono-jet of mono-photon is also promising [25,26,74,75]. The relic density is satisfied in red solid, blue dashed and orange dotted lines for fermion, scalar and vector dark matter, respectively.…”

Search for vector-mediated dark matter at the LHC with forward proton tagging

“…Although there are lots of new physics models which explain the origin of DM, simplified models of dark matter have been adopted as benchmark scenarios to study the DM search strategies at the LHC [1]. Following the recommendations for conducting the systematic DM searches by the LHC Dark Matter Working Group [2][3][4][5][6], constraints on simplified DM models based on the LHC Run-I and Run-II data have been studied for spin-0 [7][8][9][10][11][12][13][14][15], spin-1 [7-9, 13, 16-25], and spin-2 mediators [26][27][28][29][30][31][32].…”