Measurement of $B^0\toπ^+π^-π^+π^-$ Decays and Search for $B^0\toρ^0ρ^0$

The Belle Collaboration; C. -C. Chiang

doi:10.1103/PhysRevD.78.111102

paper

Measurement of $B^{0} \to π^{+} π^{-} π^{+} π^{-}$ Decays and Search for $B^{0} \to ρ^{0} ρ^{0}$

arXiv:0808.2576 · doi:10.1103/PhysRevD.78.111102

Abstract

We report on a search for the decay $B^{0} \to ρ^{0} ρ^{0}$ and other charmless modes with a $π^{+} π^{-} π^{+} π^{-}$ final state, including $B^{0} \to ρ^{0} π^{+} π^{-}$ , non-resonant $B^{0} \to 4 π^{\pm}$ , $B^{0} \to ρ^{0} f_{0} (980)$ , $B^{0} \to f_{0} (980) f_{0} (980)$ and $B^{0} \to f_{0} (980) π^{+} π^{-}$ . These results are obtained from a data sample containing 657 million $B B$ pairs collected with the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider. We set an upper limit on $B (B^{0} \to ρ^{0} ρ^{0})$ of $1.0 \times 1 0^{- 6}$ at the 90% confidence level (C.L.). From our $B^{0} \to ρ^{0} ρ^{0}$ measurement and an isospin analysis, we determine the Cabibbo-Kobayashi-Maskawa phase $ϕ_{2}$ to be $91.7 \pm 14.9$ degrees. We find excesses in $B^{0} \to ρ^{0} π^{+} π^{-}$ and non-resonant $B^{0} \to 4 π^{\pm}$ with 1.3 $σ$ and 2.5 $σ$ significance, respectively. The corresponding branching fractions are less than $12.0 \times 1 0^{- 6}$ and $19.3 \times 1 0^{- 6}$ at the 90% C.L. In addition, we set 90% C.L. upper limits as follows: $B (B^{0} \to ρ^{0} f_{0} (980)) < 0.3 \times 1 0^{- 6}$ , $B (B^{0} \to f_{0} (980) f_{0} (980)) < 0.1 \times 1 0^{- 6}$ , and $B (B^{0} \to f_{0} (980) π^{+} π^{-}) < 3.8 \times 1 0^{- 6}$ .

6 pages, 2 figures. Submitted to PRD(RC)

Measurement of $B^{0} \to π^{+} π^{-} π^{+} π^{-}$ Decays and Search for $B^{0} \to ρ^{0} ρ^{0}$

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Measurement of B0→π+π−π+π− Decays and Search for B0→ρ0ρ0

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Measurement of $B^{0} \to π^{+} π^{-} π^{+} π^{-}$ Decays and Search for $B^{0} \to ρ^{0} ρ^{0}$