We present branching fraction and CP asymmetry measurements as well as angular studies of B→ÏÏK decays using 464×106 BB̄ events collected by the BABAR experiment. The branching fractions are measured in the ÏÏ invariant mass range below the ηc resonance (mÏÏ<2.85GeV). We find B(B+→ÏÏ K+)=(5.6±0.5±0.3)×10-6 and B(B0→ÏÏK0)=(4.5±0.8±0.3)×10-6, where the first uncertainty is statistical and the second systematic. The measured direct CP asymmetries for the B± decays are A CP=-0.10±0.08±0.02 below the ηc threshold (mÏÏ<2.85GeV) and ACP=0. 09±0.10±0.02 in the ηc resonance region (m ÏÏ in [2.94, 3.02] GeV). Angular distributions are consistent with JP=0- in the ηc resonance region and favor JP=0+ below the ηc resonance.

Lees, J., Poireau, V., Prencipe, E., Tisserand, V., Tico, J., Grauges, E., et al. (2011). Measurements of branching fractions and CP asymmetries and studies of angular distributions for B→ÏÏK decays. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 84(1) [10.1103/PhysRevD.84.012001].

Measurements of branching fractions and CP asymmetries and studies of angular distributions for B→ÏÏK decays

CARPINELLI, Massimo;
2011

Abstract

We present branching fraction and CP asymmetry measurements as well as angular studies of B→ÏÏK decays using 464×106 BB̄ events collected by the BABAR experiment. The branching fractions are measured in the ÏÏ invariant mass range below the ηc resonance (mÏÏ<2.85GeV). We find B(B+→ÏÏ K+)=(5.6±0.5±0.3)×10-6 and B(B0→ÏÏK0)=(4.5±0.8±0.3)×10-6, where the first uncertainty is statistical and the second systematic. The measured direct CP asymmetries for the B± decays are A CP=-0.10±0.08±0.02 below the ηc threshold (mÏÏ<2.85GeV) and ACP=0. 09±0.10±0.02 in the ηc resonance region (m ÏÏ in [2.94, 3.02] GeV). Angular distributions are consistent with JP=0- in the ηc resonance region and favor JP=0+ below the ηc resonance.
Articolo in rivista - Articolo scientifico
Scientifica
BABAR experiment
English
Lees, J., Poireau, V., Prencipe, E., Tisserand, V., Tico, J., Grauges, E., et al. (2011). Measurements of branching fractions and CP asymmetries and studies of angular distributions for B→ÏÏK decays. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 84(1) [10.1103/PhysRevD.84.012001].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/389292
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