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We present a search for a narrow resonance in the inclusive diphoton final state using ∼ 2.7 fb −1 of data collected with the D0 detector at the Fermilab Tevatron pp Collider. We observe good agreement between the data and the background prediction, and set the first 95% C.L. upper limits on the production cross section times the branching ratio for decay into a pair of photons for resonance masses between 100 and 150 GeV. This search is also interpreted in the context of several models of electroweak symmetry breaking with a Higgs boson decaying into two photons.

This Letter describes the search for a new heavy charged gauge boson W ′ decaying into an electron and a neutrino. The data were collected with the D0 detector at the Fermilab Tevatron pp Collider at √ s = 1.96 TeV, and correspond to an integrated luminosity of about 1 fb −1 . Lacking any significant excess in the data in comparison with known processes, an upper limit is set on σ W ′ × B(W ′ → eν),

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