[séminaire] Search for Zγ resonances using the ATLAS detector

by READIOFF Nathan

Tuesday 6 Jun 2017, 11:00 → 12:00 Europe/Paris

Grand Amphi (LPSC)

Several searches for evidence of the Standard Model Higgs boson and new exotic particles decaying through a Zγ state have been performed using proton-proton collision data recorded by the ATLAS detector. The search for the Higgs boson has focused on the H->Zγ, Z->ll decay (where l = e or μ). The initial published results using data recorded in 2011 and 2012 at sqrt{s} = 7 and 8 TeV, respectively, have been refined using a novel event categorisation that exploits the correlation between the reconstructed Higgs and Z boson masses to enhance the sensitivity. The analysis has recently been updated to use data recorded by the ATLAS detector at sqrt{s} = 13 TeV; the latest public results are presented. Searches for exotic high mass resonances decaying to a Zγ final state have focused on leptonic decays of the Z (Z->ll, l = e or μ), though consideration has also been given to hadronic decays (Z->qq). An overview is given of the development of this analysis from initial conception to the current best limits on the production cross-section times the branching ratio for a new high-mass resonance; the latest public results are presented.

Slides Search_for_Z-Photon_Resonances_with_ATLAS.pdf