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In this dissertation, a measurement of CP-violating effects in decays of neutral B meson is presented. The data sample for this measurement consists of about 88 million [Upsilon](4S) [yields] B[bar B] decays collected between 1999 and 2002 with the BABAR detector at the PEP-II asymmetric-energy e[sup +]e[sup -] collider, located at the Stanford Linear Accelerator Center. One neutral B meson is fully reconstructed in the CP eigenstates J/[psi] K[sub S][sup 0], [psi](2S)K[sub S][sup 0], [chi][sub c1]K[sub S][sup 0], and [eta][sub c]K[sub S][sup 0], or in the flavor eigenstates D(*)[sup -] [pi][sup +]/[rho][sup +]/a[sub 1][sup +] and J/[psi] K*[sup 0] (K*[sup 0] [yields] K[sup +][pi][sup -]). The other B meson is determined to be either a B[sup 0] or a [bar B][sup 0], at the time of its decay, from the properties of its decay products. The proper time [Delta]t elapsed between the decay of the two mesons is determined by reconstructing their decay vertices, and by measuring the distance between them. The CP asymmetry amplitude sin2[beta] is determined by the distributions of [Delta]t in events with a reconstructed B meson in CP eigenstates. The detector resolution and the b-flavor-tagging parameters are constrained by the [Delta]t distributions of events with a fully reconstructed flavor eigenstate. From a simultaneous maximum-likelihood fit to the [Delta]t distributions of all selected events in CP and flavor eigenstates, the value of sin2[beta] is measured to be 0.755 [+-] 0.074(stat) [+-] 0.030(syst). This value is in agreement with the Standard Model prediction, and represents a successful test of the Kobayashi-Maskawa mechanism of CP violation.
This 2nd edition is an extensive update of "B Decays?. The revisions are necessary because of the extensive amount of new data and new theoretical ideas. This book reviews what is known about b-quark decays and also looks at what can be learned in the future.The importance of this research area is increasing, as evidenced by the approval of the luminosity upgrade for CESR and the asymmetric B factories at SLAC and KEK, and the possibility of experiments at hadron colliders.The key experimental observations made thus far, measurement of the lifetimes of the different B species, B0-B0 mixing, the discovery of ?Penguin? mediated decays, and the extraction of the CKM matrix elements Vub and Vcb from semileptonic decays, as well as more mundane results, are described in great detail by the experimentalists who have been closely involved with making the measurements. Theoretical progress in understanding b-quark decays using HQET and lattice gauge techniques are described by theorists who have developed and used these techniques.Synthesizing the experimental and theoretical information, several articles discuss the implications for the ?Standard Model? and how further tests can be done using measurements of CP violation in the B system.
CP violation is intimately connected with the puzzle of matter-antimatter asymmetry and baryogenesis. In the Standard Model of particle physics, the observed CP violation phenomena are accounted for by the Cabibbo-Kobayashi-Maskawa mechanism involving a phase in the quark mixing matrix. This paper is devoted to a review of the experimental status of CP violation in the decays of B mesons.
Rare charmless hadronic B decays are particularly interesting because of their importance in understanding the CP violation, which is essential to explain the matter-antimatter asymmetry in our universe, and of their roles in testing the ''effective'' theory of B physics. The study has been done with the BABAR experiment, which is mainly designed for the study of CP violation in the decays of neutral B mesons, and secondarily for rare processes that become accessible with the high luminosity of the PEP-II B Factory. In a sample of 89 million produced B{bar B} pairs on the BABAR experiment, we observed the decays B{sup 0} {yields} {omega}K{sup 0} and B{sup +} {yields} {omega}{rho}{sup +} for the first time, made more precise measurements for B{sup +} {yields} {omega}h{sup +} and reported tighter upper limits for B {yields} {omega}K* and B{sup 0} {yields} {omega}{rho}{sup 0}.
Dramatic progress has been made in particle physics during the past three decades. The B physics is one of the most exciting and rich field in today's world of particle physics to test the Standard Model and to explore the new physics. One of the most mysterious phenomena in particle physics that remains unresolved for a long time is the CP violation which is directly related to matter-antimatter asymmetry. Until recently, the CP violation was seen only in K\bar K system and it was expected to be significantly large in B\bar B system. In the summer of 2001 the presence of CP violation in the B meson system was established by the Belle collaboration (and simultaneously by the BaBar collaboration) through the measurement of time dependent asymmetry in the decay of B0 (B0 ) J/ Ks. This work lead to the Nobel Prize for Cabibbo, Kobayashi and Maskawa in 2008."