Search for Resonant Diphoton Production with the D0 Detector

We present a search for a narrow resonance in the inclusive diphoton final state using $\sim 2.7{\mathrm{fb}}^{-1}$ of data collected with the D0 detector at the Fermilab Tevatron $p\overline{p}$ 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.

Figure 1

(a) Normalized $O_{\mathrm{NN}}$ spectrum for photons and jets. (b) $M_{\gamma \gamma }$ spectrum in data (points) compared to the total background parametrization (solid line), including the DDP contribution derived via a sideband fit, and the total background prediction (dashed line) inside the search region for $M_H=130\mathrm{GeV}$. The inset figure compares the data to the total background prediction inside the search region including its 1 standard deviation (s.d.) uncertainty band, as well as the expected $H_{\mathrm{SM}}$ signal scaled by a factor of 50. (c) Observed and expected 95% C.L. upper limits on $\sigma \times B$ as a function of $M_H$. Also shown are the predictions for $\sigma \times B$ in the different EWSB scenarios discussed in the text.