Measurement of dijet correlations in beauty production with ZEUS at HERA 

Dijet correlations in beauty production were measured using dijet events with
a muon in the final state with the ZEUS detector at HERA  using an integrated
luminosity of 114 pb-1. The beauty tagging efficiency was increased by almost 
an order of magnitude with respect to earlier such measurements by enlarging 
the kinematic range of the muon selection. Measured dijet angular correlation 
cross sections are compared to NLO predictions and to corresponding 
measurements in charm production.