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Search for Pair Production of a New b ' Quark that Decays into a Z Boson and a Bottom Quark with the ATLAS Detector
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
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Number of Authors: 3040
2012 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 109, no 7, 071801- p.Article in journal (Refereed) Published
Abstract [en]

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 root 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.

Place, publisher, year, edition, pages
2012. Vol. 109, no 7, 071801- p.
Keyword [en]
Root-S=7 Tev, Collisions
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-102944DOI: 10.1103/PhysRevLett.109.071801ISI: 000307709400006Scopus ID: 2-s2.0-84865251772OAI: oai:DiVA.org:kth-102944DiVA: diva2:557631
Note

QC 20120928. Author count: 3040

Available from: 2012-09-28 Created: 2012-09-28 Last updated: 2017-12-07Bibliographically approved

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Strandberg, Jonas

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