在B0→(ρπ)0的含时Dalitz分析中CP不对称性的测量以及对夸克混合矩阵角φ2的约束
Measurement of CP asymmetry in a time-dependent Dalitz analysis of B0-->(rhopi)0 and a constraint on the quark mixing matrix angle phi2.
作者信息
Kusaka A, Wang C C, Ishino H, Abe K, Abe K, Adachi I, Aihara H, Anipko D, Aulchenko V, Aushev T, Bakich A M, Barberio E, Bay A, Bedny I, Belous K, Bitenc U, Bizjak I, Blyth S, 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, Chistov R, Choi S-K, Choi Y, Choi Y K, Cole S, Dalseno J, Danilov M, Dash M, Dragic J, Drutskoy A, Eidelman S, Fratina S, Fujikawa M, Gabyshev N, Garmash A, Gershon T, Gokhroo G, Golob B, Ha H, Haba J, Hara T, Hastings N C, Hayasaka K, Hayashii H, Hazumi M, Heffernan D, Hokuue T, Hoshi Y, Hou S, Hou W-S, Hsiung Y B, Iijima T, Ikado K, Imoto A, Inami K, Ishikawa A, Itoh R, Iwasaki M, Iwasaki Y, Kaji H, Kakuno H, Kang J H, Kapusta P, Katayama N, Kawai H, Kawasaki T, Khan H R, Kichimi H, Kim Y J, Kinoshita K, Korpar S, Krizan P, Krokovny P, Kulasiri R, Kumar R, Kuo C C, Kuzmin A, Kwon Y-J, Lee J, Lee M J, Lee S E, Lesiak T, Limosani A, Lin S-W, Liventsev D, Mandl F, Marlow D, Matsumoto T, Miyabayashi K, Miyake H, Miyazaki Y, Mizuk R, Mori T, Nakano E, Nakao M, Nakazawa H, Natkaniec Z, Nishida S, Nitoh O, Noguchi S, Ogawa S, Ohshima T, Okuno S, Onuki Y, Ozaki H, Pakhlov P, Pakhlova G, Park H, Park K S, Peak L S, Pestotnik R, Piilonen L E, Poluektov A, Sakai Y, Satoyama N, Schneider O, Schümann J, Schwartz A J, Seidl R, Senyo K, Sevior M E, Shapkin M, Shibuya H, Singh J B, Somov A, Soni N, Stanic S, Staric M, Stoeck H, Suzuki S Y, Tajima O, Takasaki F, Tamai K, Tanaka M, Taylor G N, Teramoto Y, Tian X C, Tikhomirov I, Trabelsi K, Tsuboyama T, Tsukamoto T, Uehara S, Uglov T, Unno Y, Uno S, Urquijo P, Ushiroda Y, Usov Y, Varner G, Villa S, Wang C H, Wang M-Z, Watanabe Y, Wedd R, Won E, Xie Q L, Yabsley B D, Yamaguchi A, Yamashita Y, Zhang L M, Zhang Z P, Zhilich V, Zupanc A
机构信息
Department of Physics, University of Tokyo, Tokyo.
出版信息
Phys Rev Lett. 2007 Jun 1;98(22):221602. doi: 10.1103/PhysRevLett.98.221602.
We present a measurement of CP asymmetry using a time-dependent Dalitz plot analysis of B0-->pi+pi-pi0 decays based on a 414 fb(-1) data sample containing 449 x 10(6) BB pairs. The data was collected on the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric energy e+ e- collider. Combining our analysis with information on charged B decay modes, we perform a full Dalitz and isospin analysis and obtain a constraint on the CKM angle phi2, 68 degrees < phi2 < 95 degrees as the 68.3% confidence interval for the phi2 solution consistent with the standard model (SM). A large SM-disfavored region also remains.
我们基于包含449×10⁶对B⁰B⁻的414 fb⁻¹数据样本，通过对B⁰→π⁺π⁻π⁰衰变进行含时Dalitz图分析给出了CP不对称性的测量结果。数据是在KEKB非对称能量正负电子对撞机上，利用Belle探测器在Υ(4S)共振态收集的。将我们的分析与带电B衰变模式的信息相结合，我们进行了完整的Dalitz和同位旋分析，并获得了对CKM角φ₂的一个约束，即68°<φ₂<95°，作为与标准模型（SM）一致的φ₂解的68.3%置信区间。同时也仍存在一个很大的与SM不符的区域。
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