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Isosinglet vector-like quarks are predicted by some unified theories ofelectroweak and strong interactions. We study hadron collider signatures forthe production and decay of isosinglet vector-like quarks with charge -1/3.Previous analyses of Run I data from the Fermilab Tevatron are used to setlower limits of 100--200 GeV/c^2 on the mass of such quarks, depending onassumptions about mixing with Standard Model quarks and the mass of the Higgsboson. For future Tevatron data (E_{c.m.} = 1.96 TeV) the corresponding massrange is (100-270, 100-320) GeV/c^2 for (1, 10) fb^{-1}. At the CERN LargeHadron Collider (LHC) (E_{c.m.} = 14 TeV, 100 fb^{-1}), an analysis offlavor-changing neutral-current decay modes should probe an $h$ quark massrange of 100-1100 GeV/c^2.Comment: Minor changes to text, converted to Revtex4, 38 pages, 9 figures, to  be submitted to Phys. Rev.

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Exotic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Q</mml:mi><mml:mo>=</mml:mo><mml:mi>−</mml:mi><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>3</mml:mn></mml:math>quark signatures at high-energy hadron colliders

ExoticQ=−1/3quark signatures at high-energy hadron colliders