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 20.3 fb{}^{-1} of sqrt{s}=8 TeV data collected in 2012 with the ATLAS detector at the LHC. Events are required to have at least one jet with p_{mathrm {T}}> 120 GeV and no leptons. Nine signal regions are considered with increasing missing transverse momentum requirements between E_{mathrm {T}}^{mathrm {miss}}>150 GeV and E_{mathrm {T}}^{mathrm {miss}}> 700 GeV. Good agreement is observed between the number of events in data and Standard Model expectations. The results are translated into exclusion limits on models with either large extra spatial dimensions, pair production of weakly interacting dark matter candidates, or production of very light gravitinos in a gauge-mediated supersymmetric model. In addition, limits on the production of an invisibly decaying Higgs-like boson leading to similar topologies in the final state are presented.

Highlights

  • Events with an energetic jet and large missing transverse momentum in the final state constitute a clean and distinctive signature in searches for new physics beyond the Standard Model (SM) at colliders

  • Monojet-like final states have been studied [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21] in the context of searches for supersymmetry (SUSY), large extra spatial dimensions (LED), and the search for weakly interacting massive particles (WIMPs) as candidates for dark matter (DM)

  • The distributions include the impact of different ADD, WIMP, and gauge-mediated SUSY-breaking (GMSB) SUSY scenarios

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Summary

Introduction

Events with an energetic jet and large missing transverse momentum 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 monojet-like in this paper. The W +jets and Z (→ νν)+jets backgrounds are estimated using MC event samples normalized using data in selected control regions. The remaining SM backgrounds from Z /γ ∗(→ + −)+jets, tt, single top, and dibosons are determined using simulated samples, while the multijet background contribution is extracted from data. Method Control sample Z (→ νν)+jets W (→ eν)+jets W (→ τ ν)+jets W (→ μν)+jets

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