Search for a Fourth Generation tl Quark in pp̅ Collisions at √s= 1.96 TeV

Authors

• V. M. Abazov, Joint Institute for Nuclear Research, Dubna, Russia
• Kenneth A. Bloom, University of Nebraska-LincolnFollow
• Daniel R. Claes, University of Nebraska-LincolnFollow
• Kayle DeVaughan, University of Nebraska-Lincoln
• Aaron Dominguez, University of Nebraska-LincolnFollow
• Michael Eads, University of Nebraska-LincolnFollow
• D. Johnston, University of Nebraska-LincolnFollow
• Ioannis Katsanos, University of Nebraska-LincolnFollow
• Sudhir Malik, University of Nebraska-LincolnFollow
• Gregory R. Snow, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

2011

Citation

Physical Review Letters 107, 082001 (2011); DOI: 10.1103/PhysRevLett.107.082001

Comments

Copyright 2011 American Physical Society

Abstract

We present a search for pair production of a fourth generation t^l quark and its antiparticle, followed by their decays to a W boson and a jet, based on an integrated luminosity of 5.3 fb^-1 of proton-antiproton collisions at √s= 1.96 TeV collected by the D0 Collaboration at the Fermilab Tevatron Collider. We set upper limits on the t^lt^-l production cross section that exclude at the 95% C.L. a t^l quark that decays exclusively to W + jet with a mass below 285 GeV. We observe a small excess in the µ + jets channel which reduces the mass range excluded compared to the expected limit of 320 GeV in the absence of a signal.