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Register a new userNeutral B Flavor Tagging for the Measurement of Mixing-induced CP Violation at Belle
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We describe a flavor tagging algorithm used in measurements of the CP violation parameter sin2phi_1 at the Belle experiment. Efficiencies and wrong tag fractions are evaluated using flavor-specific B meson decays into hadronic and semileptonic modes. We achieve a total effective efficiency of $ 28.8 +- 0.6 %.
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We report a measurement of the CP violation parameters in b->c anti-c d decays. Mixing-induced CP violation involving this transition is studied using a sample of B0->J/psi pi0, D*+D*- and D*+-D-+ decays with a data set accumulated at the Upsilon(4S) resonance with the Belle detector at the KEKB energy-asymmetric e+e- collider. CP violation parameters are extracted from a fit to the distributions of time intervals between two B0 meson decay vertexes.
We present the summary of the working group on $B$ mixing and the related CP violation at the CKM 2014 workshop. The contributions reflect the experimental and theoretical progress in the field over the last two years since the last CKM workshop.
We measure the time-dependent $C!P$ violation parameters in $B^{0} to K^{0}_{S}K^{0}_{S}K^{0}_{S}$ decays using $772 times 10^6$ $B {mkern 1.5muoverline{mkern-1.5mu B mkern-0.1mu}mkern 0.1mu}$ pairs collected at the $Upsilon (4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. The obtained mixing-induced and direct $C!P$ asymmetries are $-0.71 pm 0.23~{rm(stat)} pm 0.05~{rm(syst)}$ and $0.12 pm 0.16~{rm(stat)} pm 0.05~{rm(syst)}$, respectively. These values are consistent with the Standard Model predictions. The significance of $C!P$ violation differs from zero by 2.5 standard deviations.
Evidence from the babar, Belle and CDF experiments for the phenomenon of dzdzb oscillations is reviewed. A summary is made of the current understanding of the parameters defining the mixing of mass eigenstates that give rise to the oscillations. Results of searches for CP violation induced by mixing, are given, and estimates for the precision of measurements that can be expected in future experiments are made.
We report the measurements of branching fractions and CP violation asymmetries in $B^0 to phi K^{*}$ decays obtained in an angular analysis using the full data sample of $772 times 10^6 Bbar{B}$ pairs collected at the $Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. We perform a partial wave analysis to distinguish among scalar [$B^0 to phi(Kpi)^{*}_{0}$], vector [$B^0 to phi K^{*}(892)^{0}$] and tensor [$B^0 to phi K^{*}_{2}(1430)^{0}$] components, and determine the corresponding branching fractions to be $mathcal{B}[B^0 to phi(Kpi)^{*}_{0}] = (4.3 pm 0.4 pm 0.4) times 10^{-6}$, $mathcal{B}[B^0 to phi K^{*}(892)^{0}] = (10.4 pm 0.5 pm 0.6) times 10^{-6}$ and $mathcal{B}[B^0 to phi K^{*}_{2}(1430)^{0}] = (5.5 ^{+0.9}_{-0.7} pm 1.0) times 10^{-6}$. We also measure the longitudinal polarization fraction $f_L$ in $B^0 to phi K^{*}(892)^{0}$ and $B^0 to phi K^{*}_{2}(1430)^{0}$ decays to be $0.499 pm 0.030 pm 0.018$ and $0.918 ^{+0.029}_{-0.060} pm 0.012$, respectively. The first quoted uncertainties are statistical and the second are systematic. In total, we measure 26 parameters related to branching fractions, polarization and CP violation in the $B^0 to phi K^{*}$ system. No evidence for CP violation is found.
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