2011/01/29 by T. Aaltonen, The CDF Collaboration, B. Álvarez González +98 · 64 citations
Physics and Astronomy · #Branching fraction #Collider Detector at Fermilab #Electron #Fermilab #High-Energy Particle Collisions Research #Large Hadron Collider #Lepton #Luminosity #Momentum (technical analysis) #Muon #Nuclear physics #Pair production #Particle Detector Development and Performance #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum mechanics #Quark #Tevatron #hep-ex
paper · pdf · doi:10.1103/physrevlett.106.141803
published in Physical Review Letters 106(14), 141803 (American Physical Society) · For submission to PRL
arxiv created 2011/01/29 · openalex publication_date 2011/04/06 · arxiv updated 2015/03/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
We report the most sensitive direct search for pair production of fourth-generation bottomlike chiral quarks (b^\ensuremath') each decaying promptly to tW. We search for an excess of events with an electron or muon, at least five jets (one identified as due to a b or c quark), and an imbalance of transverse momentum by using data from pp collisions collected by the CDF II detector at Fermilab with an integrated luminosity of 4.8 fb^\ensuremath-1. We observe events consistent with background expectation, calculate upper limits on the b^\ensuremath' pair-production cross section (\ensuremathσ_bb^\ensuremath'\ensuremath\lesssim30 fb for m_b^\ensuremath'>375 GeV/c2), and exclude m_b^\ensuremath'<372 GeV/c2 at 95% confidence level assuming a 100% branching ratio of b^\ensuremath' to tW.