Measurement of Time-Dependent CP Asymmetry in $B^0\to D^{(\ast )\pm }{\pi }^{\mp }$ Decays and Constraints on $sin(2\beta +\gamma )$

Abstract

We present a measurement of time-dependent CP-violating asymmetries in fully reconstructed $B^0->D^{(\ast )\pm }{\pi }^{\mp }$ decays in a data sample of approximately 88 million $Y(4S)\to B\bar{B}$ decays collected with the BaBar detector at the PEP-II asymmetric-energy B factory at SLAC. We interpret the results in terms of the angles of the Cabibbo-Kobayashi-Maskawa unitarity triangle, and find $|sin(2\beta +\gamma )|>0.69$ at 68% confidence level. We exclude the hypothesis of no CP-violation ($sin(2\beta +\gamma )=0$) at 83% confidence level.

This paper has been withdrawn by the authors because it is a multiple posting of the same result. Please find the version of the paper published on Phys. Rev. Lett. in hep-ex/0308018