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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

CollaborationWith : Abdelalim Aly, Ahmed Aly / Alexandre, Gauthier / Backes, Moritz / Barone, Gaetano / Bell, Paul / Bell, William / Benhar Noccioli, Eleonora / Blondel, Alain / Bucci, Francesca / Clark, Allan Geoffrey / Dao, Valerio / Doglioni, Caterina / Ferrere, Didier / Gadomski, Szymon / Gonzalez Sevilla, Sergio / Goulette, Marc / Iacobucci, Giuseppe / La Rosa, Alessandro / Leger, Annie / Lister, Alison / Martin Dit Latour, Bertrand / Mermod, Philippe / Mora Herrera, Maria Clemencia Rosario / Nektarijevic, Snezana / Nikolics, Katalin / Pasztor, Arpad / Picazio, Attilio / Pohl, Martin / Rosbach, Kilian / Rosselet, Laurent / Wu, Xin
Published in Physical review letters. 2012, vol. 109, no. 07, 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 mb′<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 mb′<358  GeV are excluded.
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ATLAS COLLABORATION. Search for Pair Production of a New b′ Quark that Decays into a Z Boson and a Bottom Quark with the ATLAS Detector. In: Physical Review Letters, 2012, vol. 109, n° 07, p. 071801. doi: 10.1103/PhysRevLett.109.071801 https://archive-ouverte.unige.ch/unige:39858

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Deposited on : 2014-09-01

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