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Observation of B-/+-->rho-/+rho0 decays |
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| Authors: | Zhang J Nakao M Abe K Abe K Abe T Adachi I Aihara H Akatsu M Asano Y Aso T Aulchenko V Aushev T Bahinipati S Bakich A M Ban Y Banas E Behera P K Bizjak I Bondar A Bozek A Bracko M Browder T E Casey B C K Chang P Chao Y Cheon B G Chistov R Choi S-K Choi Y Choi Y K Danilov M Dong L Y Dragic J Drutskoy A Eidelman S Eiges V Enari Y Fukunaga C Gabyshev N Garmash A Gershon T Gordon A Guo R Handa F Hara T Hastings N C Hayashii H Hazumi M Hinz L Hokuue T Hoshi Y Hou W-S Hsiung Y B Huang H-C Igarashi Y Iijima T Inami K Ishikawa A Itoh R Iwasaki H Iwasaki M Iwasaki Y Jang H K Kang J H Kang J S |
| Affiliation: | Aomori University, Aomori, Japan. |
| Abstract: | We report the first observation of the charmless vector-vector decay process B-/+-->rho(-/+)rho(0). 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 B(B-/+-->rho(-/+)rho(0))=[31.7+/-7.1(stat)+3.8-6.7(syst)]x10(-6). An analysis of the rho helicity-angle distributions gives a longitudinal polarization fraction of Gamma(L)/Gamma=0.95+/-0.11(stat)+/-0.02(syst). We also measure the direct-CP-violating asymmetry A(CP)(B-/+-->rho(-/+)rho(0))=0.00+/-0.22(stat)+/-0.03(syst). |
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