Search for the standard model Higgs boson in ZH -> l+ l- bbbar production with the D0 detector in 9.7 fb-1 of ppbar collisions at sqrt(s)=1.96 TeV

TL;DR

This paper reports a search for the Standard Model Higgs boson in ZH production with decay to bbbar, using data from the D0 detector, setting upper limits on production cross sections at 95% confidence level.

Contribution

First search for ZH production with H->bbbar at the Tevatron, providing constraints on Higgs production cross sections in this channel.

Findings

No significant excess observed; limits set at 95% CL.

Observed limit at 125 GeV is 7.1 times the SM prediction.

Measurement of ZZ production cross section consistent with SM.

Abstract

We present a search for the standard model (SM) Higgs boson produced in association with a Z boson in 9.7 fb-1 of ppbar collisions collected with the D0 detector at the Fermilab Tevatron Collider at sqrt(s) = 1.96 TeV. Selected events contain one reconstructed Z-> e+e- or Z-> mu+mu- candidate and at least two jets, including at least one jet identified as likely to contain a b quark. To validate the search procedure, we also measure the cross section for ZZ production in the same final state. It is found to be consistent with its SM prediction. We set upper limits on the ZH production cross section times branching ratio for H->bbbar at the 95% C.L. for Higgs boson masses 90 < M_H < 150 GeV. The observed (expected) limit for M_H = 125 GeV is 7.1 (5.1) times the SM cross section.