Abstract

We present a method for searching for associated production of the Higgs boson and a Z boson, ppbar -> Z H , where the Z boson decays to two leptons and the Higgs decays to a pair of b quarks, leading to the llbb (two leptons, two b jets) final state. We use a matrix element weighting technique to construct the likelihood function of the Higgs content of the data sample. Using simulated pseudo-experiments, we estimate the sensitivity of the technique to observe the standard model Higgs boson with a mass of 120 GeV. We also present the limit obtained from the data on the cross section of the standard model Higgs boson at 120 GeV.

95% Confidence Limit

at M_H = 120 GeV / c^2 with 2.0 / fb of data

15.0 x predicted SM cross section (expected)

14.2 x predicted SM cross section (observed)

Expected number of events given SM prediction = 1.4

21.0 events (expected)

19.9 events (observed)

pdf png

Likelihood Expression

pdf png

Tables

pdf png

pdf png

Plots

pdf png

Pretag Kinematics Plots

Single Tagged Kinematics Plots

Double Tagged Kinematics Plots

Matrix Element agreement (tagged)

ZH : eps
ZJJ : eps
ZZ : eps
Ttbar : eps

 

Matrix Element agreement (pretag)

ZH : eps
ZJJ : eps
ZZ : eps
Ttbar : eps