Detecting new physics fromCP-violating phase measurements inBdecays

Abstract

In order to detect new physics using only $\mathrm{CP}$-violating phase measurements in $B$ decays, it is necessary to measure a phase factor which is small in the standard model, in addition to the usual large phases $\beta$ and $\gamma$. We also point out that identifying violations of the unitarity of the CKM matrix is very difficult, and cannot be done with phase measurements alone.