  A search for direct production of scalar bottom quarks (sb) is performed with
310 pb-1 of data collected by the DO experiment in ppbar collisions at
sqrt(s)=1.96 TeV at the Fermilab Tevatron Collider. The topology analyzed
consists of two b jets and an imbalance in transverse momentum due to
undetected neutralinos chi0_1, with chi0_1 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_sb,m_chi0_1) mass
plane, improving significantly upon the results from Run I of the Tevatron.
