Measurements of TimeDependent CPAsymmetry Parameters in B Meson Decays to \eta^{\prime} K^0 and of Branching Fractions of SU(3) Related Modes with BaBar Experiment at SLAC Metadata
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Title
 Main Title Measurements of TimeDependent CPAsymmetry Parameters in B Meson Decays to \eta^{\prime} K^0 and of Branching Fractions of SU(3) Related Modes with BaBar Experiment at SLAC
Creator

Author: Biassoni, PietroCreator Type: Personal

Author: U., /MilanCreator Type: Personal
Contributor

Sponsor: United States. Department of Energy.Contributor Type: Organization
Publisher

Name: Stanford Linear Accelerator CenterPlace of Publication: [Menlo Park, California]Additional Info: SLAC
Date
 Creation: 20090122
Language
 English
Description
 Content Description: In this thesis work we have measured the following upper limits at 90% of confidence level, for B meson decays (in units of 10{sup 6}), using a statistics of 465.0 x 10{sup 6} B{bar B} pairs: {Beta}(B{sup 0} {yields} {eta}K{sup 0}) < 1.6 {Beta}(B{sup 0} {yields} {eta}{eta}) < 1.4 {Beta}(B{sup 0} {yields} {eta}{prime}{eta}{prime}) < 2.1 {Beta}(B{sup 0} {yields} {eta}{phi}) < 0.52 {Beta}(B{sup 0} {yields} {eta}{omega}) < 1.6 {Beta}(B{sup 0} {yields} {eta}{prime}{phi}) < 1.2 {Beta}(B{sup 0} {yields} {eta}{prime}{omega}) < 1.7 We have no observation of any decay mode, statistical significance for our measurements is in the range 1.33.5 standard deviation. We have a 3.5{sigma} evidence for B {yields} {eta}{omega} and a 3.1 {sigma} evidence for B {yields} {eta}{prime}{omega}. The absence of observation of the B{sup 0} {yields} {eta}K{sup 0} open an issue related to the large difference compared to the charged mode B{sup +} {yields} {eta}K{sup +} branching fraction, which is measured to be 3.7 {+} 0.4 {+} 0.1 [118]. Our results represent substantial improvements of the previous ones [109, 110, 111] and are consistent with theoretical predictions. All these results were presented at Flavor Physics and CP Violation (FPCP) 2008 Conference, that took place in Taipei, Taiwan. They will be soon included into a paper to be submitted to Physical Review D. For timedependent analysis, we have reconstructed 1820 {+} 48 flavortagged B{sup 0} {yields} {eta}{prime}K{sup 0} events, using the final BABAR statistic of 467.4 x 10{sup 6} B{bar B} pairs. We use these events to measure the timedependent asymmetry parameters S and C. We find S = 0.59 {+} 0.08 {+} 0.02, and C = 0.06 {+} 0.06 {+} 0.02. A nonzero value of C would represent a directly CP nonconserving component in B{sup 0} {yields} {eta}{prime}K{sup 0}, while S would be equal to sin2{beta} measured in B{sup 0} {yields} J/{psi}K{sub s}{sup 0} [108], a mixingdecay interference effect, provided the decay is dominated by amplitudes of a single weak phase. The new measured value of S can be considered in agreement with the expectations of the 'Standard Model', inside the experimental and theoretical uncertainties. Inconsistency of our result for S with CP conservation (S = 0) has a significance of 7.1 standard deviations (statistical and systematics included). Our result for the directCP violation parameter C is 0.9 standard deviations from zero (statistical and systematics included). Our results are in agreement with the previous ones [18]. Despite the statistics is only 20% larger than the one used in previous measurement, we improved of 20% the error on S and of 14% the error on C. This error is the smaller ever achieved, by both BABAR and Belle, in TimeDependent CP Violation Parameters measurement is a b {yields} s transition.
 Physical Description: 418 pages
Subject
 Keyword: Statistics ExperimentHep, ExperimentNucl,Hepex
 Keyword: Decay
 Keyword: Amplitudes
 Keyword: B Mesons
 STI Subject Categories: 43 Particle Accelerators
 Keyword: ExperimentHep, ExperimentNucl,Hepex
 Keyword: Asymmetry
 Keyword: Physics
 Keyword: Stanford Linear Accelerator Center
 Keyword: Data
Collection

Name: Office of Scientific & Technical Information Technical ReportsCode: OSTI
Institution

Name: UNT Libraries Government Documents DepartmentCode: UNTGD
Resource Type
 Thesis or Dissertation
Format
 Text
Identifier
 Report No.: SLACR913
 Grant Number: AC0276SF00515
 DOI: 10.2172/946451
 Office of Scientific & Technical Information Report Number: 946451
 Archival Resource Key: ark:/67531/metadc901765
Note
 Display Note: http://www.slac.stanford.edu/cgiwrap/pubpage?slacr913.html