Measurement of $B^0\toπ^+π^-π^+π^-$ Decays and Search for $B^0\toρ^0ρ^0$
| dc.creator | The Belle Collaboration | |
| dc.creator | Chiang, C. -C. | |
| dc.date | 2008-08-19 | |
| dc.date | 2008-11-21 | |
| dc.date.accessioned | 2026-07-07T12:15:17Z | |
| dc.date.available | 2026-07-07T12:15:17Z | |
| dc.description | We report on a search for the decay $B^0\toρ^0ρ^0$ and other charmless modes with a $π^+π^-π^+π^-$ final state, including $B^0\toρ^0π^+π^-$, non-resonant $B^0\to 4π^{\pm}$, $B^0\toρ^0f_0(980)$, $B^0\to f_0(980)f_0(980)$ and $B^0\to f_0(980)π^+π^-$. These results are obtained from a data sample containing 657 million $B \overline B$ pairs collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. We set an upper limit on $\mathcal{B}(B^0\toρ^0ρ^0)$ of $1.0\times 10^{-6}$ at the 90% confidence level (C.L.). From our $B^0\toρ^0ρ^0$ 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 $B^0\to ρ^0π^+π^-$ and non-resonant $B^0\to 4π^{\pm}$ with 1.3$σ$ and 2.5$σ$ significance, respectively. The corresponding branching fractions are less than $12.0 \times 10^{-6}$ and $19.3 \times 10^{-6}$ at the 90% C.L. In addition, we set 90% C.L. upper limits as follows: $\mathcal{B}(B^0\toρ^0f_0(980))< 0.3 \times 10^{-6}$, $\mathcal{B}(B^0\to f_0(980)f_0(980))< 0.1 \times 10^{-6}$, and $\mathcal{B}(B^0\to f_0(980)π^+π^-)< 3.8 \times 10^{-6}$. | |
| dc.description | 6 pages, 2 figures. Submitted to PRD(RC) | |
| dc.identifier | https://arxiv.org/abs/0808.2576 | |
| dc.identifier | http://arxiv.org/abs/0808.2576 | |
| dc.identifier | Phys.Rev.D78:111102,2008 | |
| dc.identifier | doi:10.1103/PhysRevD.78.111102 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/211457 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Measurement of $B^0\toπ^+π^-π^+π^-$ Decays and Search for $B^0\toρ^0ρ^0$ | |
| dc.type | text |