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Measurements of the branching fractions (average over charge-conjugate decays), B, and CP violating asymmetries, ACP, of the decays B± → K*±?0 and B± → ?±?0 are presented.
Measurements of the branching fractions (average over charge-conjugate decays), B, and CP violating asymmetries, ACP, of the decays B± → K*±[pi]0 and B± → [rho]±[pi]0 are presented.
Over the last few years, the B factories have established the Cabbibo-Kobayashi-Maskawa mechanism of CP violation in the Standard Model through the study of the decays of B mesons. The focus of Belle and BaBar has now expanded to the search for signatures of new physics beyond the Standard Model, particularly through examination of flavor-changing neutral-current transitions, which proceed through diagrams involving virtual loops. These decays are suppressed in the Standard Model, increasing sensitivity to new-physics effects but decreasing branching fractions. Exploiting large and growing datasets, BaBar and Belle have made many measurements in loop decays where a b quark transitions to an s quark, observing hints of possible deviations from Standard Model expectations in CP-violating measurements.
The authors have reconstructed B[sup -] --> D[sup 0]K[sup -] decays with D[sup 0] mesons decaying to non-CP (K[sup -][pi][sup +]), CD-even (K[sup -]K[sup +], [pi][sup -][pi][sup +]) and CP-odd (K[sup 0][sub s][pi][sup 0]) eigenstates. They have measured the CP asymmetries A[sub CP[sup +]] = 0.40 [+-] 0.15(stat) [+-] 0.08(syst), A[sup CP[sup -]] = 0.21 [+-] 0.17(stat) [+-] 0.07(syst), and the double ratio of branching fractions R[sub +] = 0.87 [+-] 0.14(stat) [+-] 0.06(syst), R[sub -] = 0.80 [+-] 0.14(stat) [+-] 0.08(syst). These results improve the previous existing measurements from BABAR. All results presented in this document are preliminary.
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The authors present a study of B{sup -} {yields} D{sub CP}{sup 0} K{sup -} decays, where D{sub CP}{sup 0} is reconstructed in CP-event channels, based on a sample of 88.8 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEP-II e{sup +}e{sup -} storage ring. They measure the ratio of Cabibbo-suppressed to Cabibbo-favored branching fractions {Beta}(B{sup -} {yields} D{sub CP}{sup 0} K{sup -})/{Beta}(B{sup -} {yields} D{sub CP}{sup 0}{pi}{sup -}) = (8.8 {+-} 1.6(stat) {+-} 0.5(syst)) x 10{sup -2} and the CP asymmetry A{sub CP} = 0.07 {+-} 0.17(stat) {+-} 0.06(syst). The authors also measure {Beta}(B{sup -} {yields} D{sup 0}K{sup -})/{Beta}(B{sup -} {yields} D{sup 0}{pi}{sup -}) = (8.31 {+-} 0.35(stat) {+-} 0.20(syst)) x 10{sup -2} using a sample of 61.0 million B{bar B} pairs.