Graugés Pous, EugeniBABAR Collaboration2019-09-182019-09-182006-08-040031-9007https://hdl.handle.net/2445/140431We present a measurement of the branching fraction of the decay B 0 → a ± 1 ( 1260 ) π ∓ with a ± 1 ( 1260 ) → π ∓ π ± π ± . The data sample corresponds to 218 × 10 6 B ¯¯¯ B pairs produced in e + e − annihilation through the Υ ( 4 S ) resonance. We measure the branching fraction B ( B 0 → a ± 1 ( 1260 ) π ∓ ) B ( a ± 1 ( 1260 ) → π ∓ π ± π ± ) = ( 16.6 ± 1.9 ± 1.5 ) × 10 − 6 , where the first error quoted is statistical and the second is systematic.7 p.application/pdfeng(c) American Physical Society, 2006Física de partículesExperimentsParticle physicsExperimentsinfo:eu-repo/semantics/article5500572019-09-18info:eu-repo/semantics/openAccess