Measurement of beauty production from dimuon events at HERA 

                      ZEUS collaboration

                            Abstract 

Beauty production in events containing two muon in the final state has 
been measured with the ZEUS detector at HERA using an integrated 
luminosity of 114 pb^-1. A low transverse-momentum threshold for muon 
identification, in combination with the large rapidity coverage of the 
ZEUS muon system, gives access to almost the full phase space for 
beauty production. The total cross section for beauty production in 
ep collisions at sqrt(s)=318 GeV has been measured to be 
sigma_tot(ep->b bar X)=13.9+-1.5(stat.)+4.0-4.3(syst.) nb. 
Differential cross sections and a measurement of bbar correlations are 
also obtained, and compared to other beauty cross-section measurements, 
Monte Carlo models and next-to-leading-order QCD predictions.