Measurement of the CP Violation Parameters in B0 -> pi+ pi- Decays
Abstract
We present a measurement of the time-dependent charge-parity (CP) violation parameters in B0 -> pi+ pi- decays. The results are obtained from the final data sample containing 772 million BBbar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We obtain the CP violation parameters Acp = +0.33 +/- 0.06 (stat) +/- 0.03 (syst) and Scp = -0.64 +/- 0.08 (stat) +/- 0.03 (syst), where Acp and Scp represent the direct and mixing-induced CP asymmetry, respectively. Using an isospin analysis including results from other Belle measurements, we find 23.8 < phi2 < 66.8 degrees is disfavored at the 1 sigma level, where phi2 is one of the three interior angles of the CKM unitarity triangle related to B_{u,d} decays.
Keywords
Cite
@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}
}
Comments
16 pages, 5 figures, CKM2012 conference paper, Submitted to PRD