B0 -> pi+ pi- 衰变中 CP 破坏参数的测量
高能物理 - 实验
2013-11-27 v3
摘要
我们展示了 B0 -> pi+ pi- 衰变中时间依赖的电荷 - 宇称（CP）破坏参数的测量结果。数据源自 KEKB 非对称能量 e+e- 对撞机上的 Belle 探测器在 Upsilon(4S) 共振处收集的最终样本，包含 7.72 亿个 BBbar 对。我们得到 CP 破坏参数 Acp = +0.33 +/- 0.06 (stat) +/- 0.03 (syst) 和 Scp = -0.64 +/- 0.08 (stat) +/- 0.03 (syst)，其中 Acp 和 Scp 分别代表直接 CP 不对称性和混合诱导的 CP 不对称性。利用包含其他 Belle 测量结果的同位旋分析，我们发现 23.8 < phi2 < 66.8 度在 1 sigma 水平上不被支持，其中 phi2 是与 B_{u,d} 衰变相关的 CKM 幺正三角形的三个内角之一。
引用
@article{arxiv.1302.0551,
title = {Measurement of the CP Violation Parameters in B0 -> pi+ pi- Decays},
author = {Belle Collaboration and J. Dalseno and K. Prothmann and C. Kiesling and I. Adachi and H. Aihara and K. Arinstein and D. M. Asner and V. Aulchenko and T. Aushev and A. M. Bakich and A. Bala and A. Bay and P. Behera and V. Bhardwaj and B. Bhuyan and A. Bondar and G. Bonvicini and A. Bozek and M. Bračko and T. E. Browder and V. Chekelian and A. Chen and P. Chen and B. G. Cheon and K. Chilikin and R. Chistov and K. Cho and V. Chobanova and S. -K. Choi and Y. Choi and D. Cinabro and M. Danilov and Z. Doležal and Z. Drásal and A. Drutskoy and D. Dutta and K. Dutta and S. Eidelman and H. Farhat and J. E. Fast and M. Feindt and T. Ferber and A. Frey and V. Gaur and S. Ganguly and R. Gillard and Y. M. Goh and B. Golob and J. Haba and T. Hara and K. Hayasaka and H. Hayashii and T. Higuchi and Y. Hoshi and W. -S. Hou and H. J. Hyun and T. Iijima and A. Ishikawa and R. Itoh and Y. Iwasaki and T. Julius and D. H. Kah and E. Kato and H. Kawai and T. Kawasaki and D. Y. Kim and H. J. Kim and J. B. Kim and J. H. Kim and K. T. Kim and Y. J. Kim and K. Kinoshita and J. Klucar and B. R. Ko and P. Kodyš and S. Korpar and P. Križan and P. Krokovny and B. Kronenbitter and A. Kuzmin and Y. -J. Kwon and S. -H. Lee and J. Li and Y. Li and L. Li Gioi and J. Libby and C. Liu and D. Liventsev and P. Lukin and D. Matvienko and K. Miyabayashi and H. Miyata and R. Mizuk and G. B. Mohanty and A. Moll and T. Mori and H. -G. Moser and N. Muramatsu and R. Mussa and Y. Nagasaka and M. Nakao and M. Nayak and E. Nedelkovska and C. Ng and C. Niebuhr and N. K. Nisar and S. Nishida and O. Nitoh and S. Ogawa and S. Okuno and S. L. Olsen and P. Pakhlov and G. Pakhlova and C. W. Park and H. Park and H. K. Park and T. K. Pedlar and R. Pestotnik and M. Petrič and L. E. Piilonen and M. Ritter and M. Röhrken and A. Rostomyan and S. Ryu and H. Sahoo and T. Saito and Y. Sakai and S. Sandilya and L. Santelj and T. Sanuki and V. Savinov and O. Schneider and G. Schnell and C. Schwanda and A. J. Schwartz and D. Semmler and K. Senyo and O. Seon and M. E. Sevior and M. Shapkin and C. P. Shen and T. -A. Shibata and J. -G. Shiu and B. Shwartz and A. Sibidanov and F. Simon and Y. -S. Sohn and E. Solovieva and S. Stanič and M. Starič and M. Steder and M. Sumihama and K. Sumisawa and T. Sumiyoshi and U. Tamponi and G. Tatishvili and Y. Teramoto and K. Trabelsi and T. Tsuboyama and M. Uchida and S. Uehara and T. Uglov and Y. Unno and S. Uno and P. Urquijo and Y. Ushiroda and S. E. Vahsen and C. Van Hulse and P. Vanhoefer and G. Varner and V. Vorobyev and M. N. Wagner and C. H. Wang and P. Wang and X. L. Wang and M. Watanabe and Y. Watanabe and K. M. Williams and E. Won and B. D. Yabsley and H. Yamamoto and Y. Yamashita and S. Yashchenko and Y. Yook and C. Z. Yuan and Y. Yusa and Z. P. Zhang and V. Zhilich and V. Zhulanov and A. Zupanc},
journal= {arXiv preprint arXiv:1302.0551},
year = {2013}
}
备注
16 pages, 5 figures, CKM2012 conference paper, Submitted to PRD