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We study the sensitivity of the Tevatron and the 7 TeV LHC to a leptoquark Scoupling to a top quark and a charged lepton L (= e, mu, or tau). For theTevatron, we focus on the case m_S < m_t, where the leptoquark pair productioncross section is large, and the decay is three-body: S --> W b L^{\pm}. Weargue that existing Tevatron observations could exclude m_S \lsim 160 GeV. Form_S > m_t, we show that the LHC experiments with low integrated luminositycould be sensitive to such leptoquarks decaying to tl^{\pm} with l= mu or tau.

Leptoquarks decaying to a top quark and a charged lepton at hadron colliders