Measurement of the CP Violation Parameters in B0 -> pi+ pi- Decays

Belle Collaboration: J. Dalseno; K. Prothmann; C. Kiesling; I. Adachi,; H. Aihara; K. Arinstein; D. M. Asner; V. Aulchenko; T. Aushev; A. M. Bakich,; A. Bala; A. Bay; P. Behera; V. Bhardwaj; B. Bhuyan; A. Bondar; G. Bonvicini,; A. Bozek; M. Bra\v{c}ko; T. E. Browder; V. Chekelian; A. Chen; P. Chen; B. G.; Cheon; K. Chilikin; R. Chistov; K. Cho; V. Chobanova; S.-K. Choi; Y. Choi; D.; Cinabro; M. Danilov; Z. Dole\v{z}al; Z. Dr\'asal; A. Drutskoy; D. Dutta; K.; Dutta; S. Eidelman; H. Farhat; J. E. Fast; M. Feindt; T. Ferber; A. Frey; V.; Gaur; S. Ganguly; R. Gillard; Y. M. Goh; B. Golob; J. Haba; T. Hara; K.; Hayasaka; H. Hayashii; T. Higuchi; Y. Hoshi; W.-S. Hou; H. J. Hyun; T.; Iijima; A. Ishikawa; R. Itoh; Y. Iwasaki; T. Julius; D. H. Kah; E. Kato; H.; Kawai; T. Kawasaki; D. Y. Kim; H. J. Kim; J. B. Kim; J. H. Kim; K. T. Kim; Y.; J. Kim; K. Kinoshita; J. Klucar; B. R. Ko; P. Kody\v{s}; S. Korpar; P.; Kri\v{z}an; P. Krokovny; B. Kronenbitter; A. Kuzmin; Y.-J. Kwon; S.-H. Lee,; J. Li; Y. Li; L. Li Gioi; J. Libby; C. Liu; D. Liventsev; P. Lukin; D.; Matvienko; K. Miyabayashi; H. Miyata; R. Mizuk; G. B. Mohanty; A. Moll; T.; Mori; H.-G. Moser; N. Muramatsu; R. Mussa; Y. Nagasaka; M. Nakao; M. Nayak,; E. Nedelkovska; C. Ng; C. Niebuhr; N. K. Nisar; S. Nishida; O. Nitoh; S.; Ogawa; S. Okuno; S. L. Olsen; P. Pakhlov; G. Pakhlova; C. W. Park; H. Park,; H. K. Park; T. K. Pedlar; R. Pestotnik; M. Petri\v{c}; L. E. Piilonen; M.; Ritter; M. R\"ohrken; A. Rostomyan; S. Ryu; H. Sahoo; T. Saito; Y. Sakai; S.; Sandilya; L. Santelj; T. Sanuki; V. Savinov; O. Schneider; G. Schnell; C.; Schwanda; A. J. Schwartz; D. Semmler; K. Senyo; O. Seon; M. E. Sevior; M.; Shapkin; C. P. Shen; T.-A. Shibata; J.-G. Shiu; B. Shwartz; A. Sibidanov; F.; Simon; Y.-S. Sohn; E. Solovieva; S. Stani\v{c}; M. Stari\v{c}; M. Steder; M.; Sumihama; K. Sumisawa; T. Sumiyoshi; U. Tamponi; G. Tatishvili; Y. Teramoto,; K. Trabelsi; T. Tsuboyama; M. Uchida; S. Uehara; T. Uglov; Y. Unno; S. Uno,; P. Urquijo; Y. Ushiroda; S. E. Vahsen; C. Van Hulse; P. Vanhoefer; G. Varner,; V. Vorobyev; M. N. Wagner; C. H. Wang; P. Wang; X. L. Wang; M. Watanabe; Y.; Watanabe; K. M. Williams; E. Won; B. D. Yabsley; H. Yamamoto; Y. Yamashita,; S. Yashchenko; Y. Yook; C. Z. Yuan; Y. Yusa; Z. P. Zhang; V. Zhilich; V.; Zhulanov; A. Zupanc

arXiv:1302.0551·hep-ex·November 27, 2013

Measurement of the CP Violation Parameters in B0 -> pi+ pi- Decays

Belle Collaboration: J. Dalseno, K. Prothmann, C. Kiesling, I. Adachi,, H. Aihara, K. Arinstein, D. M. Asner, V. Aulchenko, T. Aushev, A. M. Bakich,, A. Bala, A. Bay, P. Behera, V. Bhardwaj, B. Bhuyan, A. Bondar, G. Bonvicini,, A. Bozek, M. Bra\v{c}ko, T. E. Browder

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TL;DR

This paper reports precise measurements of CP violation parameters in B0 -> pi+ pi- decays using a large data sample, providing insights into the CKM matrix and constraints on the unitarity triangle angle phi2.

Contribution

First measurement of CP violation parameters in B0 -> pi+ pi- decays using the full Belle data set, with implications for the CKM unitarity triangle.

Findings

01

Acp = +0.33 +/- 0.06 (stat) +/- 0.03 (syst)

02

Scp = -0.64 +/- 0.08 (stat) +/- 0.03 (syst)

03

Disfavors certain phi2 ranges at 1 sigma level

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.

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