We search for decays of a B meson into a neutral D meson and a charged kaon, with the D meson decaying into a charged kaon, a charged pion, and a neutral pion. This final state can be reached through the b -> c transition B(-)-> D(0)K(-) followed by the doubly Cabibbo-suppressed D(0)-> K(+)pi(-)pi(0), or the b -> u transition B(-)->(D) over tilde (0)K(-) followed by the Cabibbo-favored (D) over bar (0)-> K(+)pi(-)pi(0). The interference of these two amplitudes is sensitive to the angle gamma of the unitarity triangle. We present results based on 226x10(6) e(+)e(-)->Upsilon(4S)-> B (B) over bar events collected with the BABAR detector at SLAC. We find no significant evidence for these decays and we set a limit R(ADS)equivalent to Gamma([K(+) pi(-) pi(0)](D)K(-)) +Gamma([K(-) pi(+) pi(0)](D)K(+))/Gamma([K(+) pi(-) pi(0)](D)K(+)) +Gamma(K(-) pi(+) pi(0)](D)K(-)) < 0.039 at 95% confidence level, which we translate with a Bayesian approach into r(B)equivalent to|A(B(-)->(D) over bar (0)K(-))/A(B(-)-> D(0)K(-))|< 0.19 at 95% confidence level.

Search for b -> u transitions in B(-)->[K(+)pi(-)pi(0)](D)K(-) RID C-5223-2009 RID C-5719-2008 RID D-1055-2009

LUSIANI, Alberto;
2007

Abstract

We search for decays of a B meson into a neutral D meson and a charged kaon, with the D meson decaying into a charged kaon, a charged pion, and a neutral pion. This final state can be reached through the b -> c transition B(-)-> D(0)K(-) followed by the doubly Cabibbo-suppressed D(0)-> K(+)pi(-)pi(0), or the b -> u transition B(-)->(D) over tilde (0)K(-) followed by the Cabibbo-favored (D) over bar (0)-> K(+)pi(-)pi(0). The interference of these two amplitudes is sensitive to the angle gamma of the unitarity triangle. We present results based on 226x10(6) e(+)e(-)->Upsilon(4S)-> B (B) over bar events collected with the BABAR detector at SLAC. We find no significant evidence for these decays and we set a limit R(ADS)equivalent to Gamma([K(+) pi(-) pi(0)](D)K(-)) +Gamma([K(-) pi(+) pi(0)](D)K(+))/Gamma([K(+) pi(-) pi(0)](D)K(+)) +Gamma(K(-) pi(+) pi(0)](D)K(-)) < 0.039 at 95% confidence level, which we translate with a Bayesian approach into r(B)equivalent to|A(B(-)->(D) over bar (0)K(-))/A(B(-)-> D(0)K(-))|< 0.19 at 95% confidence level.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11384/6409
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