During the past few years, signs of lepton flavor universality (LFU) violation have been observed in b -> c tau(v) over bar and b -> sl(+)l(-) transitions. Recently, the D* and tau polarization fractions P-L(D)* and P-L(tau) in B -> D*tau(v) over bar decay were likewise measured by the Belle collaboration. Motivated by these intriguing results, we revisit the R-D(*) and R-K(*) anomalies in a scalar leptoquark (LQ) model, where two scalar LQs, one of which is a S U(2)(L) singlet and the other a S U(2)(L) triplet, are introduced simultaneously. We consider five b -> c tau(v) over bar mediated de...
