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

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.