Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 2: Higgs Boson 1 (Zerfälle)

T 2.6: Talk

Monday, March 27, 2017, 18:00–18:15, JUR 3

Search for H/X → Z(l⁺l⁻)γ at 13 TeV with the ATLAS Detector — •Daniel Rauch — DESY, Hamburg, Germany

In summer 2012 the ATLAS and CMS collaborations announced the discovery of a new boson observed in the decays to a pair of photons as well as pairs of W and Z bosons, reconstructed from their leptonic decay products. Further investigations indicate that, within the present uncertainties, this boson has properties compatible with those expected for the SM Higgs boson.

Besides the aforementioned final states the Higgs boson will also decay to a Z boson and a photon, which happens with a similar frequency as the decays to a pair of photons. Reconstructing the Z boson decay from pairs of charged leptons reduces the available number of events by about one order of magnitude, but allows for a signal that can be reconstructed based on lepton triggers.

The final state featuring a photon and a leptonically decaying Z boson can also be exploited to search for new high-mass resonances X.

In this talk the ATLAS H/X→ Z(l⁺l⁻)γ analysis strategy for pp collision data recorded at 13 TeV will be presented and studies on systematic theoretical uncertainties will be shown.