Search for b -> u transitions in B-+/- -> [K--/+pi(+/-)pi(0)](D)K-+/- decays

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doi:10.1103/PhysRevD.84.012002

We present a study of the decays B+ -> DK+ with D mesons reconstructed in the K+pi(-)pi(0) or K-pi(+)pi(0) final states, where D indicates a D-0 or a (D) over bar (0) meson. Using a sample of 474 x 10(6) B (B) over bar pairs collected with the BABAR detector at the PEP- II asymmetric- energy e(+)e(-) collider at SLAC, we measure the ratios R +/- equivalent to Gamma(B+->[K--/+pi(+)pi(0)](D)K+)/Gamma(B+->[K+pi(-/+)pi(0)](D)K+). We obtain R+ = (5(-10)(+12)(stat)(4)(2)(syst)) X 10(-3) and R- = (12(-10)(+12)(stat)(-5)(+3)(syst)) X 10(-3), from which we extract the upper limits at 90% probability: R+ < 23 X 10(-3) and R- < 29 X 10(-3). Using these measurements, we obtain an upper limit for the ratio r(B) of the magnitudes of the b -> u and b -> c amplitudes r(B) < 0.13 at 90% probability. RI Patrignani, Claudia/C-5223-2009; Neri, Nicola/G-3991-2012; Monge, Maria Roberta/G-9127-2012