Search for the Standard Model Higgs boson at the LEP2 collider near sqrt(S) = 183GeV

TL;DR

This paper reports on the search for the Standard Model Higgs boson at LEP2 near 183 GeV, using data from the ALEPH experiment, resulting in a new lower mass limit of 87.9 GeV/c^2 at 95% confidence.

Contribution

The study provides the first search results for the Higgs boson at this energy level, setting a new lower mass limit based on collected data.

Findings

No evidence of Higgs production was observed.

Seven candidate events were consistent with background expectations.

The lower mass limit for the Higgs boson was improved to 87.9 GeV/c^2.

Abstract

During 1997 the ALEPH experiment at LEP gathered 57pb^-1 of data at centre-of- mass energies near 183 GeV. These data are used to look for possible signals from the production of the Standard Model Higgs boson in the reaction e+e- -> HZ. No evidence of a signal is found in the data; seven events are selected, in agreement with the expectation of 7.2 events from background processes. This observation results in an improved lower limit on the mass of the Higgs boson: m_H > 87.9GeV/c^2 at 95% confidence level.