Based on a sample of 227×10^6 BB̅ pairs collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, we measure the branching fraction B(B0→π0π0)=(1.17±0.32±0.10)×10-6, and the asymmetry Cπ0π0=-0.12±0.56±0.06. The B0→π0π0 signal has a significance of 5.0σ. We also measure B(B+→π+π0)=(5.8±0.6±0.4)×10-6, B(B+→K+π0)=(12.0±0.7±0.6)×10-6, and the charge asymmetries Aπ+π0=-0.01±0.10±0.02 and AK+π0=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.
Branching fractions and CP asymmetries in B-0 ->pi(0)pi(0), B+->pi(+)pi(0), and B+-> K+pi(0) decays and isospin analysis of the B ->pi pi system
MARGONI, MARTINO;SIMONETTO, FRANCO;STROILI, ROBERTO;SIMI, GABRIELE;
2005
Abstract
Based on a sample of 227×10^6 BB̅ pairs collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, we measure the branching fraction B(B0→π0π0)=(1.17±0.32±0.10)×10-6, and the asymmetry Cπ0π0=-0.12±0.56±0.06. The B0→π0π0 signal has a significance of 5.0σ. We also measure B(B+→π+π0)=(5.8±0.6±0.4)×10-6, B(B+→K+π0)=(12.0±0.7±0.6)×10-6, and the charge asymmetries Aπ+π0=-0.01±0.10±0.02 and AK+π0=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.File in questo prodotto:
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