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We examine the possible unparticle effects on $R(D^{(*)})$ associated with$B\to D^{(*)}\tau\nu$ decays by minimum-$\chi^2$ fitting. Recent measurementsfrom Belle and LHCb are included in this analysis. While it is true that thenew experimental results of $R(D^{(*)})$ get closer to the standard modelpredictions, there are still rooms for new physics and unparticles are also onepossibility. Our best-fit values are $R(D)=0.456$ and $R(D^*)=0.270$, which arestill far from the standard model values by more than ($R(D)$) or almost($R(D^*)$) $2\sigma$. We also find that the unparticle effects are quite safeto render the branching ratio ${\rm Br}(B_c\to\tau\nu)$ less than 10\%.

Unparticle effects on $B\to D^{(*)}\tau\nu$