Search for new phenomena in final states with an energetic jet and large missing transverse momentum inppcollisions ats=13  TeVusing the ATLAS detector

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 ffiffi ffi s p ¼ 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 miss T > 250 GeV and E miss T > 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.

Simplified dark matter models with a spin-2 mediator at the LHC

“…This is also the reason that the process has a huge K factor especially in the low-mass region [28]. 5 In the context of DM searches, the monojet signature is expected to give important constraints on the model. The fiducial cross sections for pp → Y 2 j with p j T > 200 GeV and |η j | < 5 are shown in Fig.…”

“…Following the proposal, the Run-I data as well as the early Run-II data have already been analysed to constrain simplified DM models with schannel spin-1 and spin-0 mediators; see e.g. [3][4][5][6][7][8][9][10][11][12]. On the a e-mail: kentarou.mawatari@lpsc.in2p3.fr other hand, the model with a spin-2 mediator [13,14] has not been fully explored for the LHC yet-it is one of the next-generation simplified DM models [15].…”

Torsion as a dark matter candidate from the Higgs portal

“…In the same Figure we present LHC limits obtained using an interpretation of the ATLAS mono-jet analysis of Ref. [40] for 3.2 fb −1 integrated luminosity. For our analysis we performed parton level simulation with CalcHEP, followed by PYTHIA8 [42] and Delphes 3 [43] to simulate hadronisation and patron showering, and for fast detector simulation respectively.…”

“…This choice of 1% for the limit on BG uncertainty is based on the post-fit numbers with respective BG error provided by ATLAS and CMS for E miss T bins with high statistics, see e.g. [40,45] together with additional materials provided at http://cms-results.…”

Asymmetric dark matter: residual annihilations and self-interactions

“…coupled to the radiation bath, and matter decoupled from the radiation bath in the early Universe [7]. On the other hand, searches for DM-induced nuclear recoils at direct detection experiments [8][9][10][11][12][13], production of DM at colliders [14][15][16] and indirect detection of DM through observation of its annihilation products in the universe around us [17,18] -apart from some long-standing anomalies [19][20][21][22][23][24][25][26] -have so far turned out negative.…”