New New-Phenomena Results from Dzero

Abstract

We have searched for diphoton events (\ggmet) with large missing transverse momentum, $\gamma \text{/}{E}_T$ events (\gmetjj) with two or more jets, and diphoton events ($\gamma \gamma$) with high transverse energies in $p\bar{p}$ collisions at $\sqrt{s}=1.8$ TeV using approximately 100~pb${}^{-1}$ of data collected with the DØdetector at the Fermilab Tevatron in 1992--1996. No excess of events beyond the expected backgrounds is observed. The null results are interpreted in supersymmetric models with a dominant ${\tilde{\chi }}_2^0\to \gamma {\tilde{\chi }}_1^0$ decay and in terms of Dirac pointlike monopole production.

11 pages, 6 figures, Presented at the 1998 Rencontres de Physique de la Vallee d'Aoste, La Thuile, Italy, March 1-7, 1998