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(stat)+/-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.

Aubert, B., Barate, R., Boutigny, D., Couderc, F., Gaillard, J., Hicheur, A., et al. (2004). Direct CP violating asymmetry in B0→ K+π-decays. PHYSICAL REVIEW LETTERS, 93(13) [10.1103/PhysRevLett.93.131801].

Direct CP violating asymmetry in B0→ K+π-decays

CARPINELLI, Massimo;
2004

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(stat)+/-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.
Articolo in rivista - Articolo scientifico
Approximation theory; Calorimeters; Charged particles; Computer simulation; Crystals; Error analysis; Kinematics; Matrix algebra; Maximum likelihood estimation; Monte Carlo methods; Oscillations; Parameter estimation; Probability; Sampling; Solenoids
English
2004
93
13
131801
none
Aubert, B., Barate, R., Boutigny, D., Couderc, F., Gaillard, J., Hicheur, A., et al. (2004). Direct CP violating asymmetry in B0→ K+π-decays. PHYSICAL REVIEW LETTERS, 93(13) [10.1103/PhysRevLett.93.131801].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/389907
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