Search for pair production of a new b' quark that decays into a Z boson and a bottom quark with the ATLAS detector
Affiliation
- 1 Fakultät für Mathematik und Physik, Albert-Ludwigs-Universität, Freiburg i.Br., Germany.
- PMID: 23006356
- DOI: 10.1103/PhysRevLett.109.071801
Search for pair production of a new b' quark that decays into a Z boson and a bottom quark with the ATLAS detector
Authors
Affiliation
- 1 Fakultät für Mathematik und Physik, Albert-Ludwigs-Universität, Freiburg i.Br., Germany.
- PMID: 23006356
- DOI: 10.1103/PhysRevLett.109.071801
Abstract
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(-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 (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(b') < 358 GeV are excluded.
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