ATLAS collaboration (3026 authors)Aguilar-Saavedra, Juan AntonioAmaral, PedroAnjos, NunoCarvalho, JoaoCastro, Nuno FilipeConde Muino, PatriciaDo Valle Wemans, AndreFiolhais, MiguelGomes, AgostinhoGoncalo, RicardoJorge, PedroLopes, LourencoMachado Miguens, JoanaMaio, AmeliaManeira, JoseOliveira, Miguel AlfonsoOnofre, AntonioPalma, AlbertoPina, Joao AntonioPinto, BelmiroSantos, HelenaSaraiva, JoaoSilva, JoseSoares, MaraVeloso, FilipeWolters, Helmut2019-02-032019-02-032013-07-16http://dx.doi.org/10.1016/j.physletb.2011.11.059http://hdl.handle.net/10400.26/26040A measurement is presented of the cross-section for b-jet production in association with a Z boson in pp collisions at a centre-of-mass energy of sqrt(s)=7 TeV. The analysis uses the data sample collected by the ATLAS experiment in 2010, corresponding to an integrated luminosity of approximately 36 pb^-1. The event selection requires a Z boson decaying into high pt electrons or muons, and a b-jet, identified by its displaced vertex, with transverse momentum pt>25 GeV and rapidity |y|<2.1. After subtraction of backgrounds, the yield is extracted from the vertex mass distribution of the candidate b-jets. The ratio of this cross-section to the inclusive Z cross-section (the average number of b-jets per Z event) is also measured. Both results are found to be in good agreement with perturbative QCD predictions at next-to-leading order.engjournal article2019-02-03