Search for b->u transitions in B- -> D0 K- and B- -> D*0 K-

Abstract

We search for B- ==> \tilde{D0}K- and B- ==> \tilde{D*0}K-, with \tilde{D*0} ==> \tilde{D0}pi0 or \tilde{D*0} ==> \tilde{D0}gamma, and \tilde{D0} ==> K+pi- (and charge conjugates). These final states can be reached through the b==>c transition B- ==> D0(*)K- followed by the doubly CKM-suppressed D0 ==> K+pi-, or the b==>u transition B- ==> D0bar(*)K- followed by the CKM-favored D0bar ==> K+pi-. The interference of these two amplitudes is sensitive to the angle gamma of the unitarity triangle. Our results are based on 232 million Upsilon(4S)==>BBbar decays collected with the BaBar detector at SLAC. We find no significant evidence for these decays. We set a limit r_B = |A(B- ==> D0bar K-)/A(B- ==> D0 K-)| < 0.23 at 90% C.L. using the most conservative assumptions on the values of the CKM angle gamma and the strong phases in the B and D decay amplitudes. In the case of the D* we set a 90% C.L. limit r*_B^2 = |A(B- ==> D*0bar K-)/A(B- ==> D*0 K-)|^2 < (0.16)^2 which is independent of assumptions on gamma and strong phases.

15 pages, 13 postscript figures, Final version to be published in Phys. Rev. D

References in corpus (4)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• CP Violation and the CKM Matrix: Assessing the Impact of the Asymmetric B Factories
• On ${\varphi }_3$ Measurements Using $B^{-}\to D^{\ast }{K}^{-}$ Decays
• Study of the Suppressed Decays $B^{-}\to [K^{+}{\pi }^{-}{]}_D{K}^{-}$ and $B^{-}\to [K^{+}{\pi }^{-}{]}_D{\pi }^{-}$

Cited by in corpus (12)

• Flavor Physics in the Quark Sector
• CP violation and the CKM matrix
• Measurement of CP observables in B+- --> D_CP K+- decays and constraints on the CKM angle gamma
• Determination of the D0 -> K-pi+pi0 and D0 -> K-pi+pi+pi- Coherence Factors and Average Strong-Phase Differences Using Quantum-Correlated Measurements
• Determining the unitarity triangle angle $\gamma$ with a four-body amplitude analysis of ${\mathrm{B}}^{\pm }\to ({\mathrm{K}}^{+}{\mathrm{K}}^{-}{\pi }^{+}{\pi }^{-}{)}_{\mathrm{D}}{\mathrm{K}}^{\pm }$ decays
• B Meson Decays
• Measurements of the branching fractions and CP-asymmetries of B- --> D0_(CP) K- decays
• Study of the suppressed B meson decay B^- -> D K^-, D -> K^+ π^-
• Time-dependent Dalitz plot analysis of B0 -> D-(+) K0 Pi+(-) decays
• Search for b--> u transitions in B- -> [K+pi-pi0]_D K-
• CP violation in beauty decays
• LHCb strategies for gamma from B to DK