Evidence for B0ρ0ρ0 Decays and Implications for the Cabibbo-Kobayashi-Maskawa Angle α

B. Aubert et al. (BABAR Collaboration)
Phys. Rev. Lett. 98, 111801 – Published 13 March 2007

Abstract

We search for the decays B0ρ0ρ0, B0ρ0f0(980), and B0f0(980)f0(980) in a sample of about 384×106 Υ(4S)BB¯ decays collected with the BABAR detector at the PEP-II asymmetric-energy e+e collider at Stanford Linear Accelerator Center. We find evidence for B0ρ0ρ0 with 3.5σ significance and measure the branching fraction B=(1.07±0.33±0.19)×106 and longitudinal polarization fraction fL=0.87±0.13±0.04, where the first uncertainty is statistical, and the second is systematic. The uncertainty on the Cabibbo-Kobayashi-Maskawa quark-mixing matrix unitarity angle α due to penguin contributions in Bρρ decays is 18° at the 1σ level. We also set upper limits on the B0ρ0f0(980) and B0f0(980)f0(980) decay rates.

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  • Received 11 December 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.111801

©2007 American Physical Society

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Vol. 98, Iss. 11 — 16 March 2007

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