Heidelberg 2007 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 416: Higgs Physik I

T 416.2: Vortrag

Donnerstag, 8. März 2007, 17:00–17:15, HS Mathematik

Search for Higgs boson in H→ b b decay channel with the ATLAS detector — •Jianming Yuan, Nectarios Benekos, Siegfried Bethke, Sandra Horvat, Oliver Kortner, Sergey Kotov, Hubert Kroha, Susanne Mohrdieck-Möck, and Robert Richter — MPI für Physik, Föhringer Ring 6, 80805 München, Deutschland

The Standard Model predicts the existence of the Higgs boson but not its mass. The Higgs boson mass is constrained by the LEP2 experiments to be greater than 114 GeV. With high-resolution measurements of electrons, and muons and good secondary vertex detection for b-quark identification, the ATLAS detector at the Large Hadron Collider offers the opportunity to explore the full range of possible Higgs boson masses. We study the observability of H→ b b decays in associated production with tt using the fast and the full ATLAS detector simulation. In addition, we study the feasibility of the detection of H→ bb decays in vector boson fusion production. The two forward jets in this production mode and the veto on light jets in the central detector region allow for an efficient suppression of the reducible tt→ WWbb and single-top backgrounds. However, the extraction of the H→ bb signal is still challenging due to large b b and Z+jets background contributions, and the relatively low trigger efficiency for the signal.