Off-campus UMass Amherst users: To download dissertations, please use the following link to log into our proxy server with your UMass Amherst user name and password.
Non-UMass Amherst users, please click the view more button below to purchase a copy of this dissertation from Proquest.
(Some titles may also be available free of charge in our Open Access Dissertation Collection, so please check there first.)
Observation of CP violation in B0 → K+pi- and B 0 → pi+pi- decays with the BABAR detector
This dissertation describes the measurement of asymmetries in neutral B meson decays to two-body final states of charged pions and kaons. The results are obtained from a data sample of 383 million ϒ(4 S) → BB¯ decays collected between 1999 and 2006 with the BABAR detector at the PEP-II asymmetric-energy B factory located at the Stanford Linear Accelerator Center, California. ^ The maximum likelihood fit that incorporates kinematical, event-shape, and particle identification information is used to measure the CP asymmetries in B0 → π +π− and K± π∓ decays. The direct CP-violating asymmetry between decays to K−π + is AKπ = −0.107 ± 0.018+0.007-0.004 . The time-dependent CP-violating parameters in B0 → π+π− decays are Sππ = −0.60 ± 0.11 ± 0.03, Cππ = −0.21 ± 0.09 ± 0.02. For all the measurements above, the first error is statistical and the second is systematic. ^
Physics, Elementary Particles and High Energy
"Observation of CP violation in B0 → K+pi- and B 0 → pi+pi- decays with the BABAR detector"
(January 1, 2007).
Electronic Doctoral Dissertations for UMass Amherst.