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Home > Research > Publications & Outputs > Search for the Standard Model Higgs boson at LEP.
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Search for the Standard Model Higgs boson at LEP.

Research output: Contribution to journalJournal article

Published

Journal publication date17/07/2003
JournalPhysics Letters B
Volume565
Number of pages15
Pages61-75
Original languageEnglish

Abstract

The four LEP Collaborations, ALEPH, DELPHI, L3 and OPAL, have collected a total of 2461 pb−1 of e+e− collision data at centre-of-mass energies between 189 and 209 GeV. The data are used to search for the Standard Model Higgs boson. The search results of the four Collaborations are combined and examined in a likelihood test for their consistency with two hypotheses: the background hypothesis and the signal plus background hypothesis. The corresponding confidences have been computed as functions of the hypothetical Higgs boson mass. A lower bound of 114.4 GeV/c2 is established, at the 95% confidence level, on the mass of the Standard Model Higgs boson. The LEP data are also used to set upper bounds on the HZZ coupling for various assumptions concerning the decay of the Higgs boson.