Search for Multi-photon Signatures in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV

A preliminary cross section for the inclusive multiphoton production is presented, as measured by the Run II D\O\ detector at the Fermilab Tevatron $p\bar{p}$ collider. Photon candidates with transverse momenta greater than 15 GeV$/c$ and within the pseudorapidity of $|\eta| < 2.5$ are considered. Selection criteria for photon candidates as well as the estimation of background contributions from QCD and EW processes are presented. Event topologies with $\gamma\gamma\gamma+X$ in the final state which are relevant for fermiophobic Higgs boson searches in two Higgs doublet and triplet models are emphasized. Preliminary limits on the mass of fermiophobic Higgs boson are set.