Abstract
Results 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 3.2 fb${}^{-1}$ at $\sqrt{s}=13$ TeV collected in 2015 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. Several signal regions are considered with increasing missing-transverse-momentum requirements between $E_{\rm T}^{\rm miss} >250$ GeV and $E_{\rm T}^{\rm miss} > 700$ 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 large extra spatial dimensions, pair production of weakly interacting dark-matter candidates, and the production of supersymmetric particles in several compressed scenarios.
Highlights
Events with an energetic jet and large missing transverse momentum p~mT iss in the final state constitute a clean and distinctive signature in searches for new physics beyond the Standard Model (SM) at colliders
Monojet final states have been studied at the Large Hadron Collider (LHC) [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15] in the context of searches for large extra spatial dimensions (LED), supersymmetry (SUSY), and weakly interacting massive particles (WIMPs) as candidates for dark matter
The Arkani-Hamed, Dimopoulos, and Dvali (ADD) model for LED [16] explains the large difference between the electroweak unification scale at Oð102Þ GeV and the Planck scale MPl ∼ Oð1019Þ GeV by postulating the presence of n extra spatial dimensions of size R, and defining a fundamental Planck scale in 4 þ n dimensions, MD, given by MPl2 ∼ MD2þnRn
Summary
Events with an energetic jet and large missing transverse momentum p~mT iss (with magnitude EmT iss) in the final state constitute a clean and distinctive signature in searches for new physics beyond the Standard Model (SM) at colliders. Such signatures are referred to as monojetlike in this paper. Many new particle-physics models such as SUSY [17,18,19,20,21,22,23,24,25] predict WIMPs. In contrast to the Run-1 analyses with the monojetlike final state [37], the results of this analysis are not interpreted in terms of the effective-field-theory models [38].
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