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arxiv 1302.0551 v3 pith:EHFB6BDP submitted 2013-02-03 hep-ex

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
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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
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classification hep-ex
keywords decaysparametersviolationbellemeasurementphi2resultsstat
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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    CP asymmetries for B+ to pi+ pi0, D+ to pi+ pi0, and K+ to pi+ pi0 are estimated in the Standard Model at roughly 3 times 10 to the -3, 10 to the -5, and 10 to the -6 using a unified formalism for isospin violation.