Prospects for the Measurement of the Unitarity Triangle Angle gamma from B0 to DK+pi- Decays

Abstract

The potential for a precise measurement of the Unitarity Triangle angle $\gamma$ in future experiments from the decay $B^0\to D{K}^{\ast 0}$ is well-known. It has recently been suggested that the sensitivity can be significantly enhanced by analysing the $B^0\to D{K}^{+}{\pi }^{-}$ Dalitz plot to extract amplitudes relative to those of the flavour-specific decay $B^0\to D_2^{\ast -}{K}^{+}$. An extension to this method which includes the case where the neutral $D$ meson is reconstructed in suppressed final states is presented. The sensitivity to $\gamma$ is estimated using this method and compared to that obtained using the $B^0\to D{K}^{\ast 0}$ decay alone. Experimental effects, such as background contamination, are also considered. This approach appears to be a highly attractive addition to the family of methods that can be used to determine $\gamma$.

Comments: 12 pages, 10 figures. v2 as published