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. 2003 Nov 28;91(22):221801.
doi: 10.1103/PhysRevLett.91.221801. Epub 2003 Nov 24.

Observation of B-/+-->rho-/+rho0 decays

J Zhang  1 , M Nakao, K Abe, K Abe, T Abe, I Adachi, H Aihara, M Akatsu, Y Asano, T Aso, V Aulchenko, T Aushev, S Bahinipati, A M Bakich, Y Ban, E Banas, P K Behera, I Bizjak, A Bondar, A Bozek, M Bracko, T E Browder, B C K Casey, P Chang, Y Chao, B G Cheon, R Chistov, S-K Choi, Y Choi, Y K Choi, M Danilov, L Y Dong, J Dragic, A Drutskoy, S Eidelman, V Eiges, Y Enari, C Fukunaga, N Gabyshev, A Garmash, T Gershon, A Gordon, R Guo, F Handa, T Hara, N C Hastings, H Hayashii, M Hazumi, L Hinz, T Hokuue, Y Hoshi, W-S Hou, Y B Hsiung, H-C Huang, Y Igarashi, T Iijima, K Inami, A Ishikawa, R Itoh, H Iwasaki, M Iwasaki, Y Iwasaki, H K Jang, J H Kang, J S Kang, S U Kataoka, N Katayama, H Kawai, N Kawamura, T Kawasaki, D W Kim, H J Kim, Hyunwoo Kim, J H Kim, S K Kim, K Kinoshita, P Koppenburg, S Korpar, P Krizan, P Krokovny, R Kulasiri, S Kumar, A Kuzmin, Y-J Kwon, G Leder, S H Lee, T Lesiak, J Li, A Limosani, S-W Lin, D Liventsev, J MacNaughton, G Majumder, F Mandl, D Marlow, H Matsumoto, T Matsumoto, A Matyja, W Mitaroff, K Miyabayashi, H Miyata, D Mohapatra, T Mori, T Nagamine, Y Nagasaka, T Nakadaira, E Nakano, J W Nam, Z Natkaniec, S Nishida, O Nitoh, T Nozaki, S Ogawa, T Ohshima, T Okabe, S Okuno, S L Olsen, W Ostrowicz, H Ozaki, H Park, K S Park, N Parslow, J-P Perroud, L E Piilonen, M Rozanska, H Sagawa, S Saitoh, Y Sakai, T R Sarangi, A Satpathy, O Schneider, J Schümann, C Schwanda, A J Schwartz, S Semenov, K Senyo, R Seuster, M E Sevior, T Shibata, H Shibuya, V Sidorov, J B Singh, S Stanic, M Staric, A Sugi, K Sumisawa, T Sumiyoshi, S Suzuki, S Y Suzuki, S K Swain, T Takahashi, F Takasaki, K Tamai, N Tamura, M Tanaka, G N Taylor, Y Teramoto, T Tomura, S N Tovey, K Trabelsi, T Tsuboyama, T Tsukamoto, S Uehara, S Uno, G Varner, K E Varvell, C C Wang, C H Wang, J G Wang, M-Z Wang, Y Watanabe, E Won, B D Yabsley, Y Yamada, A Yamaguchi, Y Yamashita, M Yamauchi, H Yanai, Heyoung Yang, Y Yusa, Z P Zhang, Y Zheng, V Zhilich, D Zontar, D Zürcher; Belle Collaboration
Affiliations

Observation of B-/+-->rho-/+rho0 decays

J Zhang et al. Phys Rev Lett. .

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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