We present updated measurements of the branching fractions for B(0) meson decays to eta K(0), eta eta, eta phi, eta omega, eta(')K(0), eta(')eta('), eta(')phi, and eta(')omega, and branching fractions and CP-violating charge asymmetries for B(+) decays to eta pi(+), eta K(+), eta(')pi(+), and eta(')K(+). The data represent the full data set of 467x10(6) BB pairs collected with the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) collider at the SLAC National Accelerator Laboratory. Besides large signals for the four charged B decay modes and for B(0)->eta(')K(0), we find evidence for three B(0) decay modes at greater than 3.0 sigma significance. We find B(B(0)->eta K(0))=(1.15(-0.38)(+0.43)+/- 0.09)x10(-6), B(B(0)->eta omega)=(0.94(-0.30)(+0.35)+/- 0.09)x10(-6), and B(B(0)->eta(')omega)=(1.01(-0.38)(+0.46)+/- 0.09)x10(-6), where the first (second) uncertainty is statistical (systematic). For the B(+)->eta K(+) decay mode, we measure the charge asymmetry A(ch)(B(+)->eta K(+))=-0.36 +/- 0.11 +/- 0.03.
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Titolo: | B meson decays to charmless meson pairs containing eta or eta' mesons |
Autori: | |
Data di pubblicazione: | 2009 |
Rivista: | |
Abstract: | We present updated measurements of the branching fractions for B(0) meson decays to eta K(0), eta eta, eta phi, eta omega, eta(')K(0), eta(')eta('), eta(')phi, and eta(')omega, and branching fractions and CP-violating charge asymmetries for B(+) decays to eta pi(+), eta K(+), eta(')pi(+), and eta(')K(+). The data represent the full data set of 467x10(6) BB pairs collected with the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) collider at the SLAC National Accelerator Laboratory. Besides large signals for the four charged B decay modes and for B(0)->eta(')K(0), we find evidence for three B(0) decay modes at greater than 3.0 sigma significance. We find B(B(0)->eta K(0))=(1.15(-0.38)(+0.43)+/- 0.09)x10(-6), B(B(0)->eta omega)=(0.94(-0.30)(+0.35)+/- 0.09)x10(-6), and B(B(0)->eta(')omega)=(1.01(-0.38)(+0.46)+/- 0.09)x10(-6), where the first (second) uncertainty is statistical (systematic). For the B(+)->eta K(+) decay mode, we measure the charge asymmetry A(ch)(B(+)->eta K(+))=-0.36 +/- 0.11 +/- 0.03. |
Handle: | http://hdl.handle.net/11586/27212 |
Appare nelle tipologie: | 1.1 Articolo in rivista |