Improved measurement of CP-violating parameters in rho+rho- decays

Abstract

We present a measurement of the CP-violating asymmetry in rho+rho- decays using 535 million BBbar pairs collected with the Belle detector at the KEKB e+e- collider. We measure CP-violating coefficients A = 0.16 +- 0.21(stat) +- 0.07 (syst) and S = 0.19 +- 0.30(stat) +- 0.07 (syst}. These values are used to determine the unitarity triangle angle phi_2 using an isospin analysis; the solution consistent with Standard Model lies in the range 53 < phi_2 < 114 deg. at 90 C.L.

6 pages, 4 figures, presented at JPS/DPF 2006 (Added KEK, BELLE preprint numbers, submitted to PRD(RC))

References in corpus (2)

• A precise determination of $\alpha$ using $B^0\to {\rho }^{+}{\rho }^{-}$ and $B^{+}\to K^{\ast 0}{\rho }^{+}$
• Evidence for B0->rho0rho0 Decay and Implications for the CKM Angle alpha

Cited by in corpus (16)

• Revisiting Charmless Hadronic B_{u,d} Decays in QCD Factorization
• A Study of B0 to rho+rho- Decays and Constraints on the CKM Angle alpha
• Measurement of the CP Violation Parameters in B0 -> pi+ pi- Decays
• Charmless Hadronic B-Meson Decays
• Observation of the $B^0\to {\rho }^0{\rho }^0$ decay from an amplitude analysis of $B^0\to ({\pi }^{+}{\pi }^{-})({\pi }^{+}{\pi }^{-})$ decays
• Study of B^0 -> rho^0 rho^0 decays, implications for the CKM angle phi_2 and search for other B^0 decay modes with a four-pion final state
• Study of ${\mathbf{B}}^0\to {\rho }^{+}{\rho }^{-}$ decays and implications for the CKM angle ${\varphi }_2$
• First observation of the decay $B_s^0\to \varphi {\bar{K}}^{\ast 0}$
• Measurement of Branching Fraction and First Evidence of CP Violation in B0 --> a1+-(1260) pi-+ Decays
• Time-dependent CP asymmetries in D and B decays
• Measurement of $B^0\to {\pi }^{+}{\pi }^{-}{\pi }^{+}{\pi }^{-}$ Decays and Search for $B^0\to {\rho }^0{\rho }^0$
• Resolving the sign ambiguity in Delta Gamma_s with B_s -> D_s K
• Bounding hadronic uncertainties in $c\to u$ decays
• Experimental Status of the CKM Matrix
• CKM-UT Angles: Mixing and CP violation at the $B$ Factories
• Recent Belle results on CP violation