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Possible non-standard tqZ couplings, where q=c or u, originated from generalflavor-changing-neutral-current interactions are studied model-independentlyusing the effective Lagrangian consisting of several SU(3)xSU(2)xU(1) invariantdimension-6 operators. After the electroweak symmetry breaking, these operatorsare recombined to form four kinds of independent terms whose coefficients arecomplex in general. The Lagrangian could therefore include up to eightindependent coupling parameters. Through searches for experimentally allowedregions of these parameters, it is found that some correlations exist among thesigns and sizes of those couplings.

Correlations in flavor-changing tqZ couplings constrained via experimental data