We present a measurement of the direct CP violating asymmetry in the decay B-0-->K(+)pi(-) using a data sample of 227x10(6) Y(4S)-->B (B) over bar decays ollected with the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) collider at SLAC. We observe a total signal yield of n(K)(-)pi(+)+n(K)(+)pi(-)=1606+/-51 decays and measure the asymmetry (n(K)(-)pi(+)-n(K)(+)pi(-))/(n(K)(-)pi(+)+n(K)(+)pi(-))=-0.133+/-0.030(s tat)+/-0.009(syst). The probability of observing such an asymmetry in the absence of direct CP violation is 1.3x10(-5), corresponding to 4.2 standard deviations.

Direct CP violating asymmetry in B-0 -> K+pi(-) decays

PALANO, Antimo;POMPILI, ALEXIS
2004-01-01

Abstract

We present a measurement of the direct CP violating asymmetry in the decay B-0-->K(+)pi(-) using a data sample of 227x10(6) Y(4S)-->B (B) over bar decays ollected with the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) collider at SLAC. We observe a total signal yield of n(K)(-)pi(+)+n(K)(+)pi(-)=1606+/-51 decays and measure the asymmetry (n(K)(-)pi(+)-n(K)(+)pi(-))/(n(K)(-)pi(+)+n(K)(+)pi(-))=-0.133+/-0.030(s tat)+/-0.009(syst). The probability of observing such an asymmetry in the absence of direct CP violation is 1.3x10(-5), corresponding to 4.2 standard deviations.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11586/25985
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