Measurement of the Branching Fraction for B⁰ --> a1(1260)+-pi-+ with 535 Million BBbar Pairs

2007/06/22 by K. Abe, The Belle Collaboration, Abe, K.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.0706.3279

openalex publication_date 2007/06/22 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28

Abstract

We present a measurement of the branching fraction for the decay B⁰->a1+(1260)pi- with a1+->pi+pi+pi- using a data sample containing 535x10⁶ BBbar pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider operating at the Upsilon(4S) resonance. We measure the branching fraction Br(B⁰->a1+pi-)Br(a1+->pi+pi+pi-) = (14.9 +- 1.6 +- 2.3)x10^-6, where the first and second errors are statistical and systematic, respectively.

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