HEP Seminar: Search for the Higgs boson in the H→γγ and H→Zγ decay channels in the ATLAS detector in the first run of the LHC.

Dr Camila Rangel Smith, Universite Paris VII

Friday 18 October 2013, 1300-1400
Frankland Colloquium Room

After the discovery of a new boson announced by the ATLAS and CMS experiments the 4th of July 2012, a slight enhanced decay rate observed in the H→γγ channel raised the interest on the search in the yet unexplored H→Zγ channel. The motivation of studying simultaneously these channels is that both decays are mediated via top and W loops. These two channels are therefore sensitive to new physics, as any deviation of these decays rates with respect to the SM may occur via contributions from new heavy charged particles. I will describe the evolution of the H→γγ analysis from the first searches, to discovery of a Higgs boson and measurements of its properties. I will also review the first search in the H→Zγ performed in the ATLAS experiment with the data collected in the first run of the LHC.