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Journal of High Energy Physics


A measurement of the angular correlations between beauty and anti-beauty hadrons (BB¯) produced in pp collisions at a centre-of-mass energy of 7 TeV at the CERN LHC is presented, probing for the first time the region of small angular separation. The B hadrons are identified by the presence of displaced secondary vertices from their decays. The B hadron angular separation is reconstructed from the decay vertices and the primary-interaction vertex. The differential BB¯ production cross section, measured from a data sample collected by CMS and corresponding to an integrated luminosity of 3.1 pb−1, shows that a sizable fraction of the BB¯ pairs are produced with small opening angles. These studies provide a test of QCD and further insight into the dynamics of bb¯ production.



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