Measurement of beauty production using dimuon events with ZEUS at HERA 

Beauty production was measured using events with two muons observed in the 
final state with the ZEUS detector at HERA using an integrated luminosity 
of 114 pb-1. A low threshold for muon transverse momentum, pt, in combination 
with the large rapidity coverage of the ZEUS muon system, gives access to 
essentially the full phase space for beauty production. The total cross 
section for beauty production in ep collisons at sqrt(s)=318 GeV was measured.
Differential cross sections and bbbar correlations are also presented and 
compared to other measurements, MC models, and NLO QCD predictions. The 
latter agree with the data within errors. The shapes of all distributions 
are well described.