Search for the Standard Model Higgs boson in the tautau final state at LHC

Aula B. Touschek (Laboratori Nazionali di Frascati, Via Enrico Fermi 40, Frascati)

Aula B. Touschek

Laboratori Nazionali di Frascati, Via Enrico Fermi 40, Frascati

Via Enrico Fermi 40 00044 Frascati

The analysis performed on the data collected by CMS and ATLAS during 2011, has excluded at 95% CL the possible existence of a SM-like Higgs boson in most of the mass region that has been explored, except for a window approximately from 110 to 128 GeV/c2. In the search for a light Higgs boson, the di-tau final state plays a crucial role, thanks to its sizeable branching ratio and to excepted relatively low background contaminations. The production in association with jets, namely the Vector Boson Fusion (VBF) in the SM presents a better signal-to-background ratio with respect to the gluon-fusion process, despite the low efficiency due to the selection of the signature jets. The inclusion of these production processes in the combined analysis considerably improves the sensitivity of the Higgs search of the tau pair final state. The ATLAS and CMS analyses, based on the 2011 Data analysis and corresponding to about 4.6 fb-1 are presented with special emphasis on the differences between the two experiment approaches.

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