Zhang, J;
Nakao, M;
Abe, K;
Abe, K;
Abe, T;
Adachi, I;
Aihara, H;
... Belle Collaboration; + view all
(2003)
Observation of B--/+->rho(-/+)rho(0) decays.
PHYS REV LETT
, 91
(22)
, Article 221801. 10.1103/PhysRevLett.91.221801.
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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 Y(4S) resonance. We obtain a branching fraction of <tcal>B</tcal>(B-/+-->rho(-/+)rho(0))=[31.7+/-7.1(stat)(-6.7)(+3.8)(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).
| Type: | Article |
|---|---|
| Title: | Observation of B--/+->rho(-/+)rho(0) decays |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.91.221801 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.91.221801 |
| Language: | English |
| Additional information: | © 2003 The American Physical Society |
| Keywords: | DIRECT CP VIOLATION, B-MESON DECAYS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1308410 |
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