Towards a boosted VH->bb measurement with ATLAS -- Ilektra Christidi (UCL, Candidature CR1)

jeudi 19 janv. 2012, 14:00 → 15:00 Europe/Paris

Universe

According to the latest Higgs searches results from the LHC experiments, the elusive boson responsible for particles' mass is expected to have a mass of below 130GeV. In this region, detection is challenging due to high background levels, and thus all relevant channels are extremely important for raising the sensitivity. I will concentrate on the Higgs-Vector boson (W or Z) associated production with a subsequent Higgs decay into two b-jets. The sensitivity of this channel is significantly improved if the Higgs and the Vector boson are required to be highly boosted in the transverse direction. In this case the Higgs decay products are detected as one merged, "fat" jet, which can then be de-composed to its constituents and allow the Higgs to be reconstructed from them. In this highly boosted regime, the backgrounds are radically decreased at the expense of 95% of the signal statistics. I will present the 3 components of the Standard Model and Higgs measurements performed by ATLAS so far, that pave the way for a boosted VH->bb search: the SM inclusive b-jet and di-b-jet cross-section measurement, the relevant jet sub-structure studies, and the latest non-boosted WH->bb search results.

Slides LPNHE19jan2012.pdf