Freiburg 2008 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 42: Higgs-Physik II

T 42.1: Gruppenbericht

Donnerstag, 6. März 2008, 16:45–17:05, KGI-HS 1015

Search for the Standard Model Higgs Boson at the DØ Experiment — •Ralf Bernhard — Physikalisches Institut, Albert-Ludwigs-Universität Freiburg

The only predicted Standard Model particle still not observed in experiment is the Higgs boson. Constraints on its mass are coming from the the four LEP experiments which set a lower limit of 114 GeV. Taking theoretical constraints into account an upper bound of approximately 250 GeV can be set. At Tevatron the "low" mass (<135 GeV) Higgs boson is searched for through the associated production with a W or a Z boson, where the vector boson decays into leptons and the Higgs boson into a bb pair. The main search channels for "high" mass (>135 GeV) Higgs bosons are an inclusively produced Higgs decaying into W⁺W⁻ pair, where the W decay leptonically. A data set with an integrated luminosity of up to 3 fb⁻¹ of proton-antiproton collisions at √s = 1.96 TeV collected with the DØ detector in RunII of the Fermilab Tevatron collider has been analyzed. The obtained limits were combined with the CDF experiment and resulted in a combined Tevatron sensitivity which is now within reach of the predicted Standard Model cross section for a Higgs boson mass of 160 GeV. The status of the various Higgs boson searches is presented and prospects for future Higgs searched at the Tevatron are discussed.