Based on a sample of 227Ã-106 BB pairs collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, we measure the branching fraction B(B0â†'Ï€0Ï€0)=(1. 17±0.32±0.10)Ã-10-6, and the asymmetry CÏ€0Ï€0=-0.12±0.56±0.06. The B0â†'Ï€0Ï€0 signal has a significance of 5.0Ï. We also measure B(B+â†'Ï€+Ï€0)=(5. 8±0.6±0.4)Ã-10-6, B(B+â†'K+Ï €0)=(12.0±0.7±0.6)Ã-10-6, and the charge asymmetries AÏ€+Ï€0=-0.01±0. 10±0.02 and AK+Ï€0=0.06±0. 06±0.01. Using isospin relations, we find an upper bound on the angle difference |α-αeff| of 35° at the 90% C.L.

Aubert, B., Barate, R., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J., et al. (2005). Branching fractions and CP asymmetries in B0â†'Ï€ 0Ï€0, B+â†'Ï€+Ï€0, and B+â†'K+Ï€0 decays and isospin analysis of the Bâ†'ππ system. PHYSICAL REVIEW LETTERS, 94(18) [10.1103/PhysRevLett.94.181802].

Branching fractions and CP asymmetries in B0â†'Ï€ 0Ï€0, B+â†'Ï€+Ï€0, and B+â†'K+Ï€0 decays and isospin analysis of the Bâ†'ππ system

CARPINELLI, Massimo;
2005

Abstract

Based on a sample of 227Ã-106 BB pairs collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, we measure the branching fraction B(B0â†'Ï€0Ï€0)=(1. 17±0.32±0.10)Ã-10-6, and the asymmetry CÏ€0Ï€0=-0.12±0.56±0.06. The B0â†'Ï€0Ï€0 signal has a significance of 5.0Ï. We also measure B(B+â†'Ï€+Ï€0)=(5. 8±0.6±0.4)Ã-10-6, B(B+â†'K+Ï €0)=(12.0±0.7±0.6)Ã-10-6, and the charge asymmetries AÏ€+Ï€0=-0.01±0. 10±0.02 and AK+Ï€0=0.06±0. 06±0.01. Using isospin relations, we find an upper bound on the angle difference |α-αeff| of 35° at the 90% C.L.
Articolo in rivista - Articolo scientifico
Boundary conditions; Detectors; Elementary particles; Angle difference; Upper bound; High energy physics;
English
2005
94
18
181802
none
Aubert, B., Barate, R., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J., et al. (2005). Branching fractions and CP asymmetries in B0â†'Ï€ 0Ï€0, B+â†'Ï€+Ï€0, and B+â†'K+Ï€0 decays and isospin analysis of the Bâ†'ππ system. PHYSICAL REVIEW LETTERS, 94(18) [10.1103/PhysRevLett.94.181802].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/389892
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