Search for B+/- --> [K-/+ pi+/-]_D K+/- and upper limit on the b --> u amplitude in B+/- --> D K+/-

Abstract

We search for B+/- --> [K^-/+ pi+/-]_D K+/- decays, where [K-/+ pi+/-]_D indicates that the K-/+ pi+/- pair originates from the decay of a D0 or D0bar. Results are based on 120 million Upsilon(4S) --> B Bbar decays collected with the BaBar detector at SLAC. We set an upper limit on the ratio R_Kpi = {Gamma(B+ --> [K- pi+]_D K+) + Gamma(B- --> [K+ pi-]_D K-)}/ {Gamma(B+ --> [K+ pi-]_D K+) + Gamma(B- --> [K- pi+]_D K-)} < 0.026 (90% C.L.). This constrains the amplitude ratio r_B = |A(B- --> D0bar K-)/A(B- --> D0 K-)| < 0.22 (90% C.L.), consistent with expectations. The small value of r_B favored by our analysis suggests that the determination of the Cabibbo-Kobayashi-Maskawa phase gamma from B --> D K will be difficult.

arXiv commentReplaced with published version

References in corpus (14)

• The BABAR Detector
• Enhanced CP Violation with $B\to K{D}^0({\overline{D}}^0)$ Modes and Extraction of the CKM Angle gamma
• Determining $\gamma$ using $B^{\pm }\to D{K}^{\pm }$ with multibody D decays
• A New Approach to a Global Fit of the CKM Matrix
• Measurement of the CP-Violating Asymmetry Amplitude sin2beta
• Improved Methods for Observing CP Violation in B+/- --> K+/- D0 and Measuring the CKM Phase gamma
• Improved Measurement of Mixing-induced CP Violation in the Neutral B Meson System
• Improving bounds on $\gamma$ in $B^{\pm }\to D{K}^{\pm }$ and $B^{\pm ,0}\to D{X}_s^{\pm ,0}$
• Measuring $\gamma$ in $B^{\pm }\to K^{\pm }(K{K}^{\ast }{)}_D$ decays
• Observation of Color-suppressed ${\bar{B}}^0\to D^0{\pi }^0$, $D^{\ast 0}{\pi }^0$, $D^0\eta$, and $D^0\omega$ Decays
• Search for D0D0bar Mixing and a Measurement of the Doubly Cabibbo-suppressed Decay Rate in D0 -> K pi Decays
• Observation of ${\bar{B}}^0\to D^0{\pi }^0$ and ${\bar{B}}^0\to D^{\ast 0}{\pi }^0$
• Study of $\overline{B^0}\to D^{(\ast )0}{\pi }^{+}{\pi }^{-}$ Decays
• Measurement of Branching Fractions of Color-Suppressed Decays of the B0bar Meson to D(*)0 pi0, D(*)0 eta, D(*)0 omega, and D0 eta_prime

Cited by in corpus (6)

• Search for b->u transitions in B- -> D0 K- and B- -> D*0 K-
• Measurement of CP Observables for the Decays B+/- --> D0_CP K*+/-
• Study of the Suppressed Decays $B^{-}\to [K^{+}{\pi }^{-}{]}_D{K}^{-}$ and $B^{-}\to [K^{+}{\pi }^{-}{]}_D{\pi }^{-}$
• Study of the suppressed B meson decay B^- -> D K^-, D -> K^+ π^-
• Origins of the method to determine the CKM angle $\gamma$ using $B^{\pm }\to D{K}^{\pm }$, $D\to K_{\mathrm{S}}^0{\pi }^{+}{\pi }^{-}$ decays
• Extracting the CKM phase angle γ(\equiv ϕ_3) from isospin analysis in B\to K πdecays