B production at D0

The D{O} detector is well suited for some aspects of B physics. The muon system is capable of triggering on muons with p{sub T} down to 3 GeV/c, is dense and compact to suppress backgrounds from punchthrough and decay in flight, and covers a large pseudorapidity range {vert_bar} {eta} {vert_bar} < 3.3. This allows the study of B production in muon and multimuon channels over a wide p{sub T} and {eta} range, which should provide information about gluon densities at small x. The muon inclusive p{sub T} distribution is shown. Dimuon mass and charge correlations are analyzed to separate production and decay processes. B production in the inclusive B {yields} J/{psi} {chi} as well as J/{psi} and {gamma} production are discussed. B{bar B} mixing is studied using like-sign dimuon events.