对B-/+→rho-/+rho0衰变的观测。
Observation of B-/+-->rho-/+rho0 decays.
作者信息
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, Kataoka S U, Katayama N, Kawai H, Kawamura N, Kawasaki T, Kim D W, Kim H J, Kim Hyunwoo, Kim J H, Kim S K, Kinoshita K, Koppenburg P, Korpar S, Krizan P, Krokovny P, Kulasiri R, Kumar S, Kuzmin A, Kwon Y-J, Leder G, Lee S H, Lesiak T, Li J, Limosani A, Lin S-W, Liventsev D, MacNaughton J, Majumder G, Mandl F, Marlow D, Matsumoto H, Matsumoto T, Matyja A, Mitaroff W, Miyabayashi K, Miyata H, Mohapatra D, Mori T, Nagamine T, Nagasaka Y, Nakadaira T, Nakano E, Nam J W, Natkaniec Z, Nishida S, Nitoh O, Nozaki T, Ogawa S, Ohshima T, Okabe T, Okuno S, Olsen S L, Ostrowicz W, Ozaki H, Park H, Park K S, Parslow N, Perroud J-P, Piilonen L E, Rozanska M, Sagawa H, Saitoh S, Sakai Y, Sarangi T R, Satpathy A, Schneider O, Schümann J, Schwanda C, Schwartz A J, Semenov S, Senyo K, Seuster R, Sevior M E, Shibata T, Shibuya H, Sidorov V, Singh J B, Stanic S, Staric M, Sugi A, Sumisawa K, Sumiyoshi T, Suzuki S, Suzuki S Y, Swain S K, Takahashi T, Takasaki F, Tamai K, Tamura N, Tanaka M, Taylor G N, Teramoto Y, Tomura T, Tovey S N, Trabelsi K, Tsuboyama T, Tsukamoto T, Uehara S, Uno S, Varner G, Varvell K E, Wang C C, Wang C H, Wang J G, Wang M-Z, Watanabe Y, Won E, Yabsley B D, Yamada Y, Yamaguchi A, Yamashita Y, Yamauchi M, Yanai H, Yang Heyoung, Yusa Y, Zhang Z P, Zheng Y, Zhilich V, Zontar D, Zürcher D
机构信息
Aomori University, Aomori, Japan.
出版信息
Phys Rev Lett. 2003 Nov 28;91(22):221801. doi: 10.1103/PhysRevLett.91.221801. Epub 2003 Nov 24.
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).
我们报告了对无 charm 矢量-矢量衰变过程 B⁻/⁺→ρ⁻/⁺ρ⁰的首次观测。该测量使用了在 KEKB 非对称 e⁺e⁻对撞机上运行于 Υ(4S)共振处的 Belle 探测器收集的 78 fb⁻¹数据样本。我们得到 B(B⁻/⁺→ρ⁻/⁺ρ⁰)的分支比为[31.7±7.1(统计)+3.8 - 6.7(系统)]×10⁻⁶。对 ρ 螺旋角分布的分析给出纵向极化分数 Γ(L)/Γ = 0.95±0.11(统计)±0.02(系统)。我们还测量了直接 CP 破坏不对称性 A(CP)(B⁻/⁺→ρ⁻/⁺ρ⁰)=0.00±0.22(统计)±0.03(系统)。
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