MEASUREMENT OF THE B° LIFETIME USING PARTIAL RECONSTRUCTION.

Download or read book MEASUREMENT OF THE B° LIFETIME USING PARTIAL RECONSTRUCTION. written by and published by . This book was released on 2003 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present here the first measurement of the B° lifetime using partial reconstruction in B° → D*−? decay. A sample of approximately 5500 B° → D*−?+ events were identified among 22.7 million B{bar B} pairs collected by the BABAR experiment during the years 1999-2000. With this data, the B° lifetime is measured to be 1.616 ± 0.064 ± 0.075 ps, in good agreement with the world average. This measurement demonstrates that is it possible to use this technique to perform time-dependent B° decay analysis that is central to the measurement of the charge-parity (CP) asymmetries. Investigation of CP observables through measurements of the decays of B° mesons is the primary goal of the BABAR experiment at the PEP-II storage ring located at Stanford Linear Accelerator Center (SLAC). As the B° particle decays to final states that are directly sensitive to the CP parameter? are highly suppressed, a promising alternative approach is to use the final state B° → D*h. Using the partial event reconstruction analysis method it is possible to compensate for the small CP asymmetries in this decay.