University of Pennsylvania
Department of Physics and Astronomy
High Energy Physics Seminar
Yongsheng Gao

Charmless hadronic decays of B meson into final state containing a pseudo-scalar and a vector meson (PiRho, KRho, PiK* and KK* etc) are very important for CP violation studies. For example, B0 --> Pi+-Rho-+ and Pi0Rho0 can be used to measure the angle alpha of the unitarity triangle of the Standard Model. B+- --> Pi+-Rho0 decay mode can be used to measure the angle gamma. I will present preliminary results which include the first observation of B+- --> Pi+-Rho0 and B0 --> Pi+-Rho-+. These are the first hadronic b --> u transitions ever observed. These results are based on data collected with the CLEO detector at the Cornell Electron Storage Ring (CESR).