We perform a combination of searches for standard model Higgs boson production in $p\overline{p}$ collisions recorded by the D0 detector at the Fermilab Tevatron Collider at a center of mass energy of $\sqrt{s}=1.96\mathrm{TeV}$. The different production and decay channels have been analyzed separately, with integrated luminosities of up to $9.7{\mathrm{fb}}^{-1}$ and for Higgs boson masses $90\le M_H\le 200\mathrm{GeV}$. 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 $90<M_H<101\mathrm{GeV}$ and $157<M_H<178\mathrm{GeV}$, with an expected exclusion of $155<M_H<175\mathrm{GeV}$. In the range $120<M_H<145\mathrm{GeV}$, the data exhibit an excess over the expected background of up to 2 standard deviations, consistent with the presence of a standard model Higgs boson of mass 125 GeV.

• Received 4 March 2013

DOI:https://doi.org/10.1103/PhysRevD.88.052011