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We study effects of beyond the Standard Model physics coupling thirdgeneration quarks to leptons of the first two generations. We parametrize theseeffects by dimension-six effective operators, and we also consider relatedsimplified UV completions: scalar leptoquark and $W'$ models. We derive newconstraints on these scenarios by using recent ATLAS measurements ofdifferential cross sections of single top production in association with a $W$boson, and also show how these limits will evolve with future data. We alsodescribe how the limits can be significantly improved by using ratios ofdifferential distributions with different flavors of leptons.

Constraining New Physics with Single Top production at LHC