Combined search for the Higgs boson with the D0 experiment

Abstract

We perform a combination of searches for standard model Higgs boson production in $p\bar{p}$ collisions recorded by the D0 detector at the Fermilab Tevatron Collider at a center of mass energy of $\sqrt{s}=1.96$ TeV. The different production and decay channels have been analyzed separately, with integrated luminosities of up to 9.7 fb${}^{-1}$ and for Higgs boson masses $90\le M_H\le 200$ GeV. We combine these final states to achieve optimal sensitivity to the production of the Higgs boson. We also interpret the combination in terms of models with a fourth generation of fermions, and models with suppressed Higgs boson couplings to fermions. The result excludes a standard model Higgs boson at 95% C.L. in the ranges $90<M_H<101$ GeV and $157<M_H<178$ GeV, with an expected exclusion of $155<M_H<175$ GeV. In the range $120<M_H<145$ GeV, the data exhibit an excess over the expected background of up to two standard deviations, consistent with the presence of a standard model Higgs boson of mass 125 GeV.

18 pages, 18 figures, matches final PRD version

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