Study of tag-side CP violation with a partially reconstructed $B\to D^{*}l\nu$ decays

Precise time-dependent CP violation measurements at B-Factories require measuring the CP violation that is expected to be present in the tagging B due to $b \to u$ amplitudes. We measure the CP violation parameters for tagging B mesons decaying to charged kaons by exploiting the conservation of CP in the semileptonic decays, using $B\to D^* l\nu$ events in approximately 88 M BBar pairs collected by the BaBar detector at the PEP-II $e^+e^-$ B-factory.