Measurements of Branching Fractions and CP Asymmetries in B-> etah Decays

Abstract

We report measurements of B to pseudoscalar-pseudoscalar decays with at least one eta meson in the final state using 140 fb^{-1} of data collected by the Belle detector at KEKB e^+ e^- collider. We observe the decay B^+-> eta pi^+ and find evidence of B^+-> eta K+; the measured branching fractions are B(B^+-> eta pi^+)=(4.8^{+0.8}_{-0.7}(stat) +- 0.3(sys))*10^{-6} and B(B^+-> eta K^+)=(2.1 +- 0.6(stat)+- 0.2(sys))*10^{-6}. Their corresponding CP violating asymmetries are measured to be 0.07+- 0.15 (stat) +- 0.03(sys) for eta pi^+- and -0.49+- 0.31 (stat) +- 0.07(sys) for eta K^+-. No significant signals are found for neutral B->eta h decays. We report the following upper limits on branching fractions at the 90% confidence level: B(B-> eta K^0 < 2.0* 10^{-6}, B(B-> eta pi0)<2.5*10^{-6} and B(B-> eta eta) <2.0*10^{-6}.

7 pages, 2 figures

References in corpus (14)

• Flavor-Singlet B-Decay Amplitudes in QCD Factorization
• Charmless $B\to PP$ decays using flavor SU(3) symmetry
• Neutral B Flavor Tagging for the Measurement of Mixing-induced CP Violation at Belle
• Two-body B Meson Decays to eta and eta': Observation of B->eta K*
• Measurement of Branching Fractions for B->ππ, Kπand KK Decays
• B Decays Involving $\eta$ and ${\eta }^{\prime }$ in the Light of the $B\to K{\eta }^{\prime }$ Process
• Possible Large Direct CP Violations in Charmless B-Decays
• Two-Body Charmless B Decays Involving eta and eta'
• B Meson Decays to eta(')K*, eta(')rho,eta(')pi0, omegapi0, and phipi0
• Measurement of the Branching Fraction for B->eta' K and Search for B->eta'pi+
• Revisiting Charmless Two-Body B Decays involving ${\eta }^{\prime }$ and $\eta$
• Measurements of CP-violating Asymmetries and Branching Fractions in B Meson Decays to eta' K
• Observation of $B^0\raωK^0$, $B^+\raηπ^+$, and $B^+\raηK^+$ and Study of Related Decays
• The possibility of a sizable, direct CP-violating asymmetry in B^-+ -> K^-+ eta

Cited by in corpus (14)

• Revisiting Charmless Hadronic B_{u,d} Decays in QCD Factorization
• Branching ratios and CP asymmetries of $B\to K{\eta }^{(\prime )}$ decays in the pQCD approach
• Flavor SU(3) analysis of charmless B meson decays to two pseudoscalar mesons
• Branching Ratio and CP Asymmetry of $B\to \rho {\eta }^{(\prime )}$ Decays in the Perturbative QCD Approach
• Branching Ratio and CP Asymmetry of $B\to \pi {\eta }^{(\prime )}$ Decays in the Perturbative QCD Approach
• Charmless Hadronic B-Meson Decays
• Towards a Precision Determination of alpha in B \to pi pi Decays
• Measurement of branching fractions and charge asymmetries in B+ decays to etapi+, etaK+, etarho+ and eta'pi+, and search for B0 decays to etaK0 and etaomega
• Observation of B->etarho+ and search for B0 Decays to eta'eta, etapi0, eta'pi0, and omegapi0
• Branching Fraction Limits for B0 Decays to eta' eta, eta' pi0 and eta pi0
• Improved Measurements of Branching Fractions and CP Asymmetries in B-> eta h Decays
• Measurement of charmless $B$ Decays to $\eta K^{\ast }$ and $\eta \rho$
• Evidence for the decay B0->eta pi^0
• Sum rules for B-->pi eta('), K eta('), eta(') eta(') decays