Search for particles decaying into a Z boson and a photon in pp¯ collisions at s=1.96 TeV

We present the results of a search for a new particle X produced in pp¯ collisions at s=1.96TeV and subsequently decaying to Zγ. The search uses 0.3 fb−1 of data collected with the DØ detector at the Fermilab Tevatron Collider. We set limits on the production cross section times the branching fraction σ(pp¯→X)×B(X→Zγ) that range from 0.4 to 3.5 pb at the 95% C.L. for X with invariant masses between 100 and 1000GeV/c2, over a wide range of X decay widths.