| Summary: | A search is reported for the pair production of a new quark b' with at least one b' decaying to a Z boson and a bottom quark. The data, corresponding to 2.0 fb[superscript -1] of integrated luminosity, were collected from pp collisions at √s=7 TeV with the ATLAS detector at the CERN Large Hadron Collider. Using events with a b-tagged jet and a Z boson reconstructed from opposite-charge electrons, the mass distribution of large transverse momentum b' candidates is tested for an enhancement. No evidence for a b' signal is detected in the observed mass distribution, resulting in the exclusion at a 95% confidence level of b' quarks with masses m[subscript b']<400 GeV that decay entirely via b'→Z+b. In the case of a vectorlike singlet b' mixing solely with the third standard model generation, masses m[subscript b']<358 GeV are excluded.
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