We present improved measurements of the branching fraction B, the longitudinal polarization fraction fL, and the direct CP asymmetry ACP in the B meson decay channel B+→ρ+ρ0. The data sample was collected with the BABAR detector at SLAC. The results are B(B+→ρ+ρ0)=(23.7±1. 4±1.4)×10-6, fL=0.950±0.015±0.006, and ACP=-0.054±0.055±0.010, where the uncertainties are statistical and systematic, respectively. Based on these results, we perform an isospin analysis and determine the Cabibbo-Kobayashi-Maskawa phase angle α=arg(-VtdVtb*/VudVub*) to be (92.4-6.5+6.0)°.

Aubert, B., Karyotakis, Y., Lees, J., Poireau, V., Prencipe, E., Prudent, X., et al. (2009). Improved measurement of B+→ρ+ρ0 and determination of the quark-mixing phase angle α. PHYSICAL REVIEW LETTERS, 102(14) [10.1103/PhysRevLett.102.141802].

Improved measurement of B+→ρ+ρ0 and determination of the quark-mixing phase angle α

CARPINELLI, Massimo;
2009

Abstract

We present improved measurements of the branching fraction B, the longitudinal polarization fraction fL, and the direct CP asymmetry ACP in the B meson decay channel B+→ρ+ρ0. The data sample was collected with the BABAR detector at SLAC. The results are B(B+→ρ+ρ0)=(23.7±1. 4±1.4)×10-6, fL=0.950±0.015±0.006, and ACP=-0.054±0.055±0.010, where the uncertainties are statistical and systematic, respectively. Based on these results, we perform an isospin analysis and determine the Cabibbo-Kobayashi-Maskawa phase angle α=arg(-VtdVtb*/VudVub*) to be (92.4-6.5+6.0)°.
Articolo in rivista - Articolo scientifico
BABAR detector
English
2009
102
14
141802
none
Aubert, B., Karyotakis, Y., Lees, J., Poireau, V., Prencipe, E., Prudent, X., et al. (2009). Improved measurement of B+→ρ+ρ0 and determination of the quark-mixing phase angle α. PHYSICAL REVIEW LETTERS, 102(14) [10.1103/PhysRevLett.102.141802].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/389477
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