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We study the sensitivity of the Large Hadron Collider (LHC) to top quarkchromomagnetic (CMDM) and chromoelectric (CEDM) dipole moments and $Wtb$effective couplings in single-top production in association with a $W^-$ boson,followed by semileptonic decay of the top. We calculate the top polarizationand the effects of these anomalous couplings on it at two centre-of-mass (cm)energies, 8 TeV and 14 TeV. As a measure of top polarization, we look atdecay-lepton angular distributions in the laboratory frame, without requiringreconstruction of the rest frame of the top, and study the effect of theanomalous couplings on these distributions. We construct certain asymmetries tostudy the sensitivity of these distributions to top-quark couplings. The Wtsingle-top production mode helps to isolate the anomalous $ttg$ and $Wtb$couplings, in contrast to top-pair production and other single-top productionmodes, where other new-physics effects can also contribute. We determineindividual limits on the dominant couplings, viz., the real part of the CMDM$Re\rho_2$, the imaginary part of the CEDM $Im\rho_3$, and the real part of thetensor Wtb coupling $Ref_{2r}$, which may be obtained by utilizing theseasymmetries at the LHC. We also obtain simultaneous limits on pairs of thesecouplings taking two couplings to be non-zero at a time.

Polarization of the top quark as a probe of its chromomagnetic and chromoelectric couplings in single-top production at the Large Hadron Collider