Search for Standard Model ZH->llbb at D0

Apr 30, 2014, 3:40 PM



Oral presentation WG3: Electroweak Physics and Beyond the Standard Model WG3: Electroweak Physics and Beyond the Standard Model


Mr Peng Jiang (University of Science and Technology of China)


We present an improved measurement for the standard model Higgs boson production in association with a Z boson, using 9.7 fb-1 of ppbar collision data collected by the D0 detector at sqrt(S) = 1.96 TeV. Events are selected with two electrons or two muons that are consistent with the decay of a Z candidate, and at least two reconstructed jets including at least one b-tagged jet). We use improved algorithms for lepton reconstruction and use new optimization to determine the b-tagging operating points. Four dedicated random forests of decision trees (RFs) are trained in order to distinguish the signal from ttbar, Z+Heavy Flavor jets, Z+Light Flavor jets and diboson background events respectively. The final discriminant is trained separately in five regions according to the output of the RFs. We measure the ZH production cross-section times Higgs branching ratio to two b-jets with improved sensitivity.

Primary author

Peng Jiang (Univ. of Science & Tech. of China (CN))

Presentation materials