Taniguchi N, Nakao M, Nishida S, Adachi I, Aihara H, Arinstein K, Aushev T, Aziz T, Bakich A M, Balagura V, Bay A, Belous K, Bhardwaj V, Bitenc U, Bondar A, Bozek A, Bracko M, Browder T E, Chang M-C, Chang P, Chao Y, Chen A, Chen K-F, Chen W T, Cheon B G, Chiang C-C, Cho I-S, Choi Y, Dalseno J, Dash M, Drutskoy A, Dungel W, Eidelman S, Golob B, Ha H, Haba J, Hara T, Hayasaka K, Hayashii H, Hazumi M, Hoshi Y, Hou W-S, Hyun H J, Iijima T, Inami K, Ishikawa A, Ishino H, Itoh R, Iwabuchi M, Iwasaki M, Iwasaki Y, Joshi N J, Kah D H, Kaji H, Kang J H, Kawai H, Kawasaki T, Kichimi H, Kim S K, Kim Y I, Kim Y J, Kinoshita K, Korpar S, Krizan P, Krokovny P, Kumar R, Kuzmin A, Kwon Y-J, Kyeong S-H, Lange J S, Lee J S, Lee S E, Lesiak T, Limosani A, Lin S-W, Liu C, Liu Y, Liventsev D, Mandl F, McOnie S, Miyabayashi K, Miyazaki Y, Moloney G R, Nagasaka Y, Nakamura I, Nakano E, Nakazawa H, Natkaniec Z, Nitoh O, Nozaki T, Ogawa S, Ohshima T, Okuno S, Olsen S L, Ozaki H, Pakhlov P, Pakhlova G, Park C W, Park H, Park H K, Park K S, Peak L S, Piilonen L E, Sahoo H, Sakai Y, Sasao N, Schneider O, Schümann J, Schwanda C, Schwartz A J, Seidl R, Senyo K, Sevior M E, Shapkin M, Shen C P, Shiu J-G, Shwartz B, Singh J B, Sokolov A, Stanic S, Staric M, Sumisawa K, Sumiyoshi T, Suzuki S Y, Tamura N, Taylor G N, Teramoto Y, Tikhomirov I, Trabelsi K, Tsuboyama T, Uehara S, Uglov T, Unno Y, Uno S, Urquijo P, Varner G, Wang C H, Wang M-Z, Wang P, Wang X L, Watanabe Y, Wedd R, Wicht J, Won E, Yabsley B D, Yamashita Y, Yusa Y, Zhang Z P, Zhilich V, Zhulanov V, Zivko T, Zupanc A, Zyukova O
Kyoto University, Kyoto.
Phys Rev Lett. 2008 Sep 12;101(11):111801. doi: 10.1103/PhysRevLett.101.111801.
We report new measurements of the decays B+-->rho+gamma, B0-->rho0gamma, and B0-->omegagamma using a data sample of 657x10(6) B meson pairs accumulated with the Belle detector at the KEKB e+e- collider. We measure branching fractions B(B+-->rho+gamma)=(8.7_-2.7-1.1;+2.9+0.9)x10(-7), B(B0-->rho0gamma)=(7.8_-1.6-1.0;+1.7+0.9)x10(-7), and B(B0-->omegagamma)=(4.0_-1.7;+1.9+/-1.3)x10(-7). We also report the isospin asymmetry Delta(rhogamma)=-0.48_-0.19-0.09;+0.21+0.08 and the first measurement of the direct CP-violating asymmetry ACP(B+-->rho+gamma)=-0.11+/-0.32+/-0.09, where the first and second errors are statistical and systematic, respectively.
我们报告了使用KEKB正负电子对撞机上的 Belle 探测器积累的 657×10⁶ 个 B 介子对数据样本，对 B⁺→ρ⁺γ、B⁰→ρ⁰γ 和 B⁰→ωγ 衰变进行的新测量。我们测量的分支比为：B(B⁺→ρ⁺γ) = (8.7₋₂.₇₋₁.₁;⁺₂.₉⁺₀.₉)×10⁻⁷，B(B⁰→ρ⁰γ) = (7.8₋₁.₆₋₁.₀;⁺₁.₇⁺₀.₉)×10⁻⁷，以及 B(B⁰→ωγ) = (4.0₋₁.₇;⁺₁.₉±₁.₃)×10⁻⁷。我们还报告了同位旋不对称性 Δ(ργ) = -0.48₋₀.₁₉₋₀.₀₉;⁺₀.₂₁⁺₀.₀₈ 以及对直接 CP 破坏不对称性 ACP(B⁺→ρ⁺γ) = -0.11±0.32±0.09 的首次测量，其中第一个和第二个误差分别是统计误差和系统误差。
