Study of B0 → ρ+ ρ- Decays and implications for the CKM angle φ 2
Journal
Physical Review D
Journal Volume
93
Journal Issue
3
Date Issued
2016
Author(s)
Vanhoefer, P. et al.
Dalseno, J.
Kiesling, C.
Abdesselam, A.
Adachi, I.
Aihara, H.
Al Said, S.
Arinstein, K.
Asner, D.M.
Atmacan, H.
Aushev, T.
Aziz, T.
Babu, V.
Badhrees, I.
Bakich, A.M.
Bansal, V.
Barberio, E.
Behera, P.
Abstract
We present a measurement of the branching fraction and the longitudinal polarization fraction of B0→ρ+ρ- decays, as well as the time-dependent CP violating parameters in decays into longitudinally polarized ρ+ρ- pairs with Belle's final data set of 772×106 BB¯ pairs, at the (4S) resonance, collected at the asymmetric-energy e+e- collider KEKB. We obtain B(B0→ρ+ρ-)=(28.3±1.5(stat)±1.5(syst))×10-6, fL=0.988±0.012(stat)±0.023(syst), ACP=0.00±0.10(stat)±0.06(syst), SCP=-0.13±0.15(stat)±0.05(syst). We perform an isospin analysis to constrain the Cabibbo-Kobayashi-Maskawa angle φ2 and obtain two solutions with φ2=(93.7±10.6)°, being most compatible with other Standard-Model based fits to the data.
Type
journal article