We study the decays B0→J/ψπ+π- and B+→J/ ψπ+π0, including intermediate resonances, using a sample of 382×106 BB̄ pairs recorded by the BABAR detector at the PEP-II e+e- B factory. We measure the branching fractions B(B0→J/ψρ0)=(2. 7±0.3±0.2)×10-5 and B(B+→J/ψρ+)=(5.0±0. 7±0.3)×10-5. We also set the following upper limits at the 90% confidence level: B(B0→J/ψπ+π-nonresonant)<1.2×10-5, B(B0→J/ψf2)<4.6×10-6, and B(B+→J/ ψπ+π0nonresonant)<7.3×10-6. We measure the charge asymmetry in charged B decays to J/ψρ to be -0.11±0.12±0.08.

Aubert, B., Bona, M., Boutigny, D., Karyotakis, Y., Lees, J., Poireau, V., et al. (2007). Branching fraction and charge asymmetry measurements in B→J/ψππ decays. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 76(3) [10.1103/PhysRevD.76.031101].

Branching fraction and charge asymmetry measurements in B→J/ψππ decays

CARPINELLI, Massimo;
2007

Abstract

We study the decays B0→J/ψπ+π- and B+→J/ ψπ+π0, including intermediate resonances, using a sample of 382×106 BB̄ pairs recorded by the BABAR detector at the PEP-II e+e- B factory. We measure the branching fractions B(B0→J/ψρ0)=(2. 7±0.3±0.2)×10-5 and B(B+→J/ψρ+)=(5.0±0. 7±0.3)×10-5. We also set the following upper limits at the 90% confidence level: B(B0→J/ψπ+π-nonresonant)<1.2×10-5, B(B0→J/ψf2)<4.6×10-6, and B(B+→J/ ψπ+π0nonresonant)<7.3×10-6. We measure the charge asymmetry in charged B decays to J/ψρ to be -0.11±0.12±0.08.
Articolo in rivista - Articolo scientifico
BABAR detector
English
B. Aubert et al. (BABAR Collaboration)
Aubert, B., Bona, M., Boutigny, D., Karyotakis, Y., Lees, J., Poireau, V., et al. (2007). Branching fraction and charge asymmetry measurements in B→J/ψππ decays. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 76(3) [10.1103/PhysRevD.76.031101].
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