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T: Fachverband Teilchenphysik

T 88: Neue Physik: Dunkle Materie, Leptoquarks, Suche nach angeregten Leptonen

T 88.3: Talk

Thursday, March 12, 2015, 17:15–17:30, L.09.31 (HS 11)

Search for dark matter in lepton jets final state at ATLAS — •Mahsana Haleem — DESY, Zeuthen, Germany

The existence of dark matter is evident by several astrophysical experiments. However, the composition of dark matter is unknown. A theory of dark matter had been proposed to originally explain the unexpected excess of cosmic-ray electrons and positrons at high energies as observed initially by PAMELA and confirmed by AMS. This theory suggests existence of O(1) GeV dark photon which kinetically mixes very weakly with the Standard Model photon. There are various models that predict decays of Standard Model Higgs, Exotic Higgs, or Supersymmetry particles into invisible particles. As those dark photons are produced from heavier states, such as Higgs or Supersymmetric particles, these are highly boosted. Further, the decay products of dark photons, e.g electrons or muons, would be highly collimated. The signature of dark photons productions at the LHC is a collimated set of leptons, called lepton jets.

This presentation describes the search for the lepton jets final state in proton-proton collisions at √s = 8 TeV using the data collected with 20.3 fb⁻¹ integrated luminosity at the ATLAS experiment.