Search for Pair Production of a New b Quark that Decays into a Z Boson and a Bottom Quark with the ATLAS Detector
Popovic, D. S.
Vranješ Milosavljević, Marija
ATLAS Collaboration (ukupan broj autora: 3041)
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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) LT 400 GeV that decay entirely via b - GT Z + b. In the case of a vectorlike singlet b mixing solely with the third standard model generation, masses m(b) LT 358 GeV are excluded.
Извор:Physical Review Letters, 2012, 109, 7
- ANPCyT, Argentina, YerPhI, Armenia, ARC, Australia, BMWF, Austria, ANAS, Azerbaijan, SSTC, Belarus, CNPq, FAPESP, Brazil, NSERC, NRC, CFI, Canada, CERN, CONICYT, Chile, CAS, MOST, NSFC, China, COLCIENCIAS, Colombia, MSMT CR, MPO CR, VSC CR, Czech Republic, DNRF, DNSRC, Lundbeck Foundation, Denmark, EPLANET, ERC, European Union, IN2P3-CNRS, CEA-DSM/IRFU, France, GNAS, Georgia, BMBF, Germany, DFG, HGF, MPG, AvH Foundation, Germany, GSRT, Greece, ISF, MINERVA, GIF, DIP, Benoziyo Center, Israel, INFN, Italy, MEXT, JSPS, Japan, CNRST, Morocco, FOM, NWO, Netherlands, RCN, Norway, MNiSW, Poland, GRICES, FCT, Portugal, MERYS (MECTS), Romania, MES of Russia, ROSATOM, Russian Federation, JINR, MSTD, Serbia, MSSR, Slovakia, ARRS, MVZT, Slovenia, DST/NRF, South Africa, MICINN, Spain, SRC, Wallenberg Foundation, Sweden, SER, SNSF, Cantons of Bern and Geneva, Switzerland, NSC, Taiwan, TAEK, Turkey, STFC, Royal Society and Leverhulme Trust, United Kingdom, DOE, NSF, United States of America, ICREA
ISSN: 0031-9007 (print); 1079-7114 (electronic)