Search for the higgs boson in events with missing transverse energy and b quark jets produced in pp̄ collisions at s=1.96TeV

We search for the standard model Higgs boson produced in association with an electroweak vector boson in events with no identified charged leptons, large imbalance in transverse momentum, and two jets where at least one contains a secondary vertex consistent with the decay of b hadrons. We use ∼1fb-1 integrated luminosity of pp̄ collisions at s=1.96TeV recorded by the Collider Detector at Fermilab II experiment at the Tevatron. We find 268 (16) single (double) b-tagged candidate events, where 248±43 (14.4±2.7) are expected from standard model background processes. We observe no significant excess over the expected background and thus set 95% confidence level upper limits on the Higgs boson production cross section for several Higgs boson masses ranging from 110 to 140GeV/c2. For a mass of 115GeV/c2, the observed (expected) limit is 20.4 (14.2) times the standard model prediction. © 2008 The American Physical Society.0SCOPUS: ar.jSCOPUS: ar.j