A study of proton-proton collisions in which two b-hadrons are produced in association with a Z boson is reported. The collisions were recorded at a centre-of-mass energy of 7 TeV with the CMS detector at the LHC, for an integrated luminosity of 5.2/fb. The b-hadrons are identified by means of displaced secondary vertices, without the use of reconstructed jets, permitting the study of b-hadron pair production at small angular separation. Differential cross sections are presented as a function of the angular separation of the b-hadrons and the Z boson. In addition, inclusive measurements are presented. For both the inclusive and differential studies,different ranges of Z boson momentum are considered.
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