Search for Pair Production of Scalar Bottom Quarks inpp¯Collisions ats=1.96TeV

A search for direct production of scalar bottom quarks ($\tilde{b}$) is performed with $310{\mathrm{pb}}^{-1}$ of data collected by the D0 experiment in $p\overline{p}$ collisions at $\sqrt{s}=1.96\mathrm{TeV}$ at the Fermilab Tevatron Collider. The topology analyzed consists of two $b$ jets and an imbalance in transverse momentum due to undetected neutralinos (${\tilde{\chi }}_1^0$), with ${\tilde{\chi }}_1^0$ assumed to be the lightest supersymmetric particle. We find the data consistent with standard model expectations, and set a 95% C.L. exclusion domain in the ($m_{\tilde{b}}$, $m_{{\tilde{\chi }}_1^0}$) mass plane, improving significantly upon the results from run I of the Tevatron.