corner
corner

Phys. Rev. Lett. 93, 231801 (2004) [7 pages]

Study of the Decay B0(B̅ 0)→ρ+ρ-, and Constraints on the Cabibbo-Kobayashi-Maskawa Angle α

Download: PDF (184 kB) Buy this article Export: BibTeX or EndNote (RIS)

B. Aubert et al. BABAR Collaboration
Show All Authors/Affiliations

Received 23 April 2004; published 2 December 2004

Using a data sample of 89×106 Υ(4S)→BB̅ decays collected with the BABAR detector at the PEP-II asymmetric B Factory at SLAC, we measure the B0(B̅ 0)→ρ+ρ- branching fraction as [30±4(stat)±5(syst)]×10-6 and a longitudinal polarization fraction of fL=0.99±0.03(stat)-0.03+0.04(syst). We measure the time-dependent-asymmetry parameters of the longitudinally polarized component of this decay as CL=-0.17±0.27(stat)±0.14(syst) and SL=-0.42±0.42(stat)±0.14(syst). We exclude values of α between 19° and 71° (90% C.L.).

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.231801
DOI:
10.1103/PhysRevLett.93.231801
PACS:
13.25.Hw, 11.30.Er, 12.15.Hh