Constraints on the CKM angle alpha in the B --> rho rho decays

Details Constraints on the CKM angle alpha in the B --> rho rho decays Constraints on the CKM angle alpha in the B --> rho rho decays

2004-10-29

arxiv.org/abs/hep-ex/0410092v1

Int.J.Mod.Phys.A20:3578-3580,2005

Physics

High Energy Physics

High Energy Physics - Experiment

3 pages, 1 postscript figues, submitted to DPF2004

Scientific paper

10.1142/S0217751X05027011

Using a data sample of 122 million Upsilon(4S) -> BBbar decays collected with BaBar detector at the PEP-II asymmetric B factory at SLAC, we measure the time-dependent-asymmetry parameters of the longitudinally polarized component in the B0 -> rho^+ rho^- decay as C_L = -0.23 +/- 0.24 (stat) +/- 0.14 (syst) and S_L = -0.19 +/- 0.33 (stat) +/- 0.11 (syst). The B0 -> rho0 rho0 decay mode is also searched for in a data sample of about 227 million BBbar pairs. No significant signal is observed, and an upper limit of 1.1 * 10-6 (90% C.L.) on the branching fraction is set. The penguin contribution to the CKM angle $\alpha$ uncertainty is measured to be 11 degree. All results are preliminary.

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