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The presence of a colored scalar that is a weak doublet with fractionalelectric charges of $|Q|=2/3$ and $|Q|=5/3$ with mass below 1,TeV can providean explanation of the observed branching ratios in $B \to D^{(*)} \tau \bar\nu$ decays. The required combination of scalar and tensor operators in theeffective Hamiltonian for $b \to c \tau \bar \nu$ is generated through the$t$-channel exchange. We focus on a scenario with a minimal set of Yukawacouplings that can address a semitauonic puzzle and show that its resolutionputs a nontrivial bound on the product of the scalar couplings to $\bar \tau b$and $\bar c \nu$. We also derive additional constraints posed by $Z \to b\barb$, muon magnetic moment, lepton flavor violating decays $\mu \to e \gamma$,$\tau \to \mu \gamma$, $\tau \to e \gamma$, and $\tau$ electric dipole moment.The minimal set of Yukawa couplings is not only compatible with the massgeneration in an SU(5) unification framework, a natural environment for coloredscalars, but specifies all matter mixing parameters except for one angle in theup-type quark sector. We accordingly spell out predictions for the proton decaysignatures through gauge boson exchange and show that $p \rightarrow \pi^0 e^+$is suppressed with respect to $p \rightarrow K^+ \bar{\nu}$ and even $p\rightarrow K^0 e^+$ in some parts of available parameter space. Impact of thecolored scalar embedding in 45-dimensional representation of SU(5) onlow-energy phenomenology is also presented. Finally, we make predictions forrare top and charm decays where presence of this scalar can be testedindependently.

Minimally flavored colored scalar in $\bar B \to D^{(*)} \tau \bar \nu$ and the mass matrices constraints