D0 Search for the Higgs Boson in Multijet Events

TL;DR

This paper reports on two searches for the Higgs boson at the Fermilab Tevatron, focusing on multijet events, setting upper limits on production cross sections and exploring potential signals in specific decay channels.

Contribution

It presents novel search strategies for Higgs bosons in multijet events and sets new upper limits on production in the studied channels at Tevatron energies.

Findings

Upper limits on neutral Higgs production between 90-150 GeV

95% confidence level upper limits on ZH production with H→bb̄ between 105-135 GeV

No significant Higgs signal observed in the analyzed channels

Abstract

We present two searches for the Higgs boson in \sqrt{s} = 1.96 TeV p\bar{p}collisions using data taken with the \dz detector during Run II of the Fermilab Tevatron collider. The first study is a search for neutral Higgs bosons produced in association with bottom quarks. We set upper limits on the production of neutral Higgs bosons in the mass range of 90 to 150 GeV.The second study is a search for the standard model Higgs boson produced in association with the Z boson. We study the p\bar{p}\to ZH \to \nu \bar{\nu} b \bar{b} channel, which is one of the most sensitive ways to search for light Higgs bosons at the Tevatron. We search for a peak in invariant mass distribution of two b-tagged jets. After subtracting the backgrounds, we set the 95% C.L. upper limits on the \sigma(p\bar{p} \to ZH \to \nu \bar{\nu}) \times BR(H) \to b\bar{b}) for Higgs masses between 105 and 135 GeV.