Dresden 2013 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 45: Higgs-Physik 2

T 45.2: Vortrag

Montag, 4. März 2013, 17:00–17:15, HSZ-01

Search for the neutral MSSM Higgs bosons in the final state with hadronically decaying τ pairs at the ATLAS experiment — •Federico Scutti, Jochen Dingfelder, and Will Davey — Physikalisches Institut, Universität Bonn

The Minimal Supersymmetric Standard Model (MSSM) predicts the existence of five Higgs bosons, two charged (H^±) and three neutral (h, H, A). At tree level their properties are determined by two independent parameters: the mass of the CP−odd Higgs boson m_A, and the ratio of the vacuum expectation values of the two Higgs doublets tanβ.

In Supersymmetric models, the Higgs boson couplings to down-type fermions like b quarks or τ leptons is significantly enhanced at large tanβ. Decays of the MSSM Higgs bosons h/H/A to τ-lepton pairs provide a cleaner environment for the search than decays to b quarks.

The τ lepton can decay into a muon or an electron, plus neutrinos, or in hadrons plus one neutrino.

In this talk, the search for the neutral MSSM Higgs bosons (h, H, A) is presented, where the final state is a pair of hadronically decaying τ leptons. This channel provides particularly good sensitivity for high masses.

Signal events have to be separated from the background which is dominated by di-jet events from strong interaction processes, Drell-Yan and W+jets events. The event selection is optimized in two independent categories, based on different trigger selection, providing their best sensitivities in complementary mass regions.