Heidelberg 2007 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 615: Higgs Physik III

T 615.1: Gruppenbericht

Freitag, 9. März 2007, 16:45–17:05, INF 306 SR 14

Standard Model Higgs Searches at D0 — •Harald Fox — Physikalisches Institut, Albert-Ludwigs-Universität Freiburg

The Higgs boson is the only Standard Model particle that has not yet been discovered. The LEP experiments set a lower limit for the Higgs mass of 114.4~GeV. Theoretical constraints lead to an upper bound of approximately 250~GeV. The Tevatron collider at Fermilab is the world's highest energy collider with center-of-mass energy of 2~TeV. The search for the standard model Higgs boson is one of its main tasks. The D0 experiment at the Tevatron has collected an integrated luminosity of about $1.8fb^{-1}$. The low mass Higgs boson was 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 $b\bar{b}$ pair. The main search channel for high-mass Higgs bosons is decays into $W^+W^-$ pairs, with subsequent decays into leptons. In 2006 preliminary results based on an integrated luminosity of about $1fb^{-1}$ have been presented. The combined Tevatron sensitivity is now within a factor of five 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 future prospects are discussed.