Observation of B⁰ -> a₁^+/-(1260) π^-/+

2005/07/26 by Belle Collaboration
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.hep-ex/0507096

Abstract

We report a new measurement of the branching fraction of neutral B meson decays B⁰\ra a₁^±(1260)π^∓ with \ensurematha₁^±(1260)\ra ρ⁰π^± and ρ⁰\ra pi⁺π^- using 275× 10⁶ BBar pairs collected by the Belle detector at the KEKBasymmetric-energy e⁺e^- collider. We measure the branching fraction B(B⁰\ra a₁^±(1260)π^∓=(48.6± 4.1(stat)± 3.9(syst)) × 10^-6. Using a relativistic Breit-Wigner parameterization, we measure the mass and width of the a₁(1260) to be m_a1=1197± 34 MeV/c² and Γ_a1=305± 43 MeV/c², respectively.

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