Search for dark matter and other new phenomena in events with an energetic jet and large missing transverse momentum using the ATLAS detector

Abstract

The ATLAS CollaborationResults of a search for new phenomena in final states with an energetic jet and large missing transverse momentum are reported. The search uses proton-proton collision data corresponding to an integrated luminosity of 36.1 fb −1 at a centre-of-mass energy of 13 TeV collected in 2015 and 2016 with the ATLAS detector at the Large Hadron Collider. Events are required to have at least one jet with a transverse momentum above 250 GeV and no leptons (e or µ). Several signal regions are considered with increasing requirements on the missing transverse momentum above 250 GeV. Good agreement is observed between the number of events in data and Standard Model predictions. The results are translated into exclusion limits in models with pair-produced weakly interacting dark-matter candidates, large extra spatial dimensions, and supersymmetric particles in several compressed scenarios.

Collider detection of dark matter electromagnetic anapole moments

“…In the most recent ATLAS monojet study [79], which presents results for 36 fb −1 of data combined from 2015 and 2016, the L1 and high level trigger (HLT) systems select events with missing energy above 90 GeV. After analysis selections, the trigger was measured to be fully efficient for events with E T > 250 GeV.…”

Multilepton dark matter signals

“…This framework has been much explored in the literature, but usually in the context of 'simplified dark matter models', where only the dark matter particle plus the mediator, Z ′ , are considered. This leads to very characteristic signals already searched for at the LHC, such as mono-Higgs [42,43], mono-top [44,45], mono-Z/W [46][47][48] and mono-jet [48,49] production. The common feature of these signals is the production of a SM particle together with large missing energy resulting from the undetected dark matter particle.…”

Minimal model of torsion mediated dark matter

“…Similar to dilepton searches, dijet bounds would not be of much significance. The relevant limits may come from the monojet searches which is induced by the axial vector couplings [54,55]. According to an analysis in [54], which corresponds to 13 TeV CM energy and 12.9 f b −1 integrated luminosity, torsion mass upto ∼ 2 TeV has been ruled out if one assumes a coupling strength of 0.25 between the mediators and the SM fermions while a coupling strength of 1.0 between the mediators and the DM particles.…”