Yet another way to measure $\gamma$

Abstract

We show that the CKM phase $2\beta +\gamma$ can be extracted from measurement of the time dependent rates in the decays ${\bar{B}}^0\to D^{(\ast )\pm }{M}^{\mp }$ and $B^0\to D^{(\ast )\pm }{M}^{\mp }$, where $M=a_0$, $\pi (1300)$, $b_1$, $a_2$, ${\pi }_2$, ${\rho }_3$. These channels have a large asymmetry between decays of ${\bar{B}}^0$ and $B^0$ into the same final state. Even though the branching ratios are small, their sensitivity to $\gamma$ can be competitive with decays into $D^{(\ast )}$ and $(\pi ,\rho ,a_1)$.

Comments: 5 pages, some clarifications and references added