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J. Stefan Institute, Jamova 39, P. O. Box 3000, 1001 Ljubljana, SloveniaDepartment of Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, SloveniaE-mail: jernej.kamenik@ijs.siA colored weak singlet scalar state with hypercharge 4/3 is one of the possible candidates for theexplanation of the unexpectedly large forward-backward asymmetry in tt¯production as measuredby the CDF and D0 experiments. We investigate the role of this state in a plethora of avor chang-ing neutral current processes and precision observables of down-quarks and charged leptons. Ouranalysis includes tree- and loop-level mediated observables in the K and B systems, the chargedlepton sector, as well as the Z !bb¯ width. We perform a t of the relevant scalar couplings. Thisapproach can explain the (g 2)

Scalar diquark in top-antitop production and constraints on Yukawa sector of grand unified theories