Measurements of the angular correlations between beauty and anti-beauty
hadrons produced in LHC pp collisions at sβ=7 TeV are presented. These
results probe for the first time the small angular separation region and show
sensitivity to collinear particle emission. The results are compared with
predictions based on perturbative QCD calculations at leading and
next-to-leading order.Comment: Conference proceedings for XIV International Conference on Hadron
Spectroscopy "Hadron 2011"; 5 pages, 4 figure