Observation of B+ -> rho+ rho0

Abstract

We report the first observation of the charmless vector-vector decay process B+ ->rho+ rho0. The measurement uses a 78 fb^{-1} data sample collected with the Belle detector at the KEKB asymmetric e+e- collider operating at the Upsilon(4S) resonance. We obtain a branching fraction of Br(B+ ->rho+ rho0)=(31.7+-7.1(stat.)+3.8-6.7(sys.))*10^{-6}. An analysis of the rho helicity-angle distributions gives a longitudinal polarization of Gamma_{L}/Gamma=(94.8+-10.6(stat.)+-2.1(sys.))%.

5 pages, 3 figures, submitted to Phys. Rev. Lett

References in corpus (12)

• CP Violation and Strong Phases from Penguins in ${\mathbf{B}}^{\pm }\to \mathbf{VV}$ Decays
• Study of Charmless Hadronic B Meson Decays to Pseudoscalar-Vector Final States
• Bounding the effect of penguin diagrams in $a_{CP}(B^0\to {\pi }^{+}{\pi }^{-})$
• Measurement of Branching Fractions for B->ππ, Kπand KK Decays
• Observation of $B\to \varphi K$ and $B\to \varphi K^{\ast }$
• Uncertainties on the CP Phase $\bfalpha$ due to Penguin Diagrams
• Rho-Omega Mixing and Direct CP Violation in Hadronic B-Decays
• Measurement of the decays B-->phi K and B-->phi K^*
• Direct CP violation of B meson via rho-omega interference
• Tree-Penguin Interference and Tests for $\cos \gamma <0$ in Rare $B\to PP$, $PV$ and $VV$ Decays
• A Search for Charmless $B\to VV$ Decays
• Determining the Phases alpha and gamma from Direct CP Violation in B_u, B_d and B_s Decays to Two Vectors

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