Possible signatures of unparticles in rare annihilation typeBdecays

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Abstract

We investigate the effect of unparticles in the pure annihilation type decays ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}_{s}^{\ensuremath{-}}\ensuremath{\phi}$ and ${D}_{s}^{\ensuremath{-}}{K}^{*0}$. Since these decays have only annihilation contributions their branching ratios are expected to be very small in the standard model and the direct $CP$ asymmetry parameters to be zero. We find that due to the unparticle effect these branching ratios can be significantly enhanced from their standard model values. Furthermore, sizable nonzero direct $CP$ violation could also be possible in these channels due to the presence of intrinsic $CP$ conserving phase in the unparticle propagator.

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