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Measurement of Branching Fractions and CP Asymmetries in B -> wK Decays and First Evidence of CP Violation in B0 -> wKS0

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arxiv 1311.6666 v3 pith:QOUYE72U submitted 2013-11-26 hep-ex

V. Chobanova , J. Dalseno , C. Kiesling , I. Adachi , H. Aihara , D. M. Asner , V. Aulchenko , T. Aushev
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T. Aziz A. M. Bakich A. Bala Y. Ban K. Belous B. Bhuyan A. Bobrov G. Bonvicini A. Bozek M. Bračko T. E. Browder D. Červenkov V. Chekelian A. Chen B. G. Cheon K. Chilikin R. Chistov K. Cho Y. Choi D. Cinabro M. Danilov Z. Doležal Z. Drásal D. Dutta K. Dutta S. Eidelman S. Esen H. Farhat J. E. Fast T. Ferber V. Gaur N. Gabyshev S. Ganguly A. Garmash R. Gillard Y. M. Goh B. Golob J. Haba K. Hayasaka X. H. He Y. Horii Y. Hoshi W.-S. Hou Y. B. Hsiung H. J. Hyun T. Iijima K. Inami A. Ishikawa Y. Iwasaki T. Iwashita I. Jaegle T. Julius J. H. Kang E. Kato H. Kawai T. Kawasaki D. Y. Kim H. J. Kim J. B. Kim J. H. Kim M. J. Kim Y. J. Kim K. Kinoshita J. Klucar B. R. Ko P. Kodyš S. Korpar P. Krokovny B. Kronenbitter T. Kuhr T. Kumita A. Kuzmin J. S. Lange S.-H. Lee J. Li Y. Li L. Li Gioi J. Libby D. Liventsev P. Lukin D. Matvienko K. Miyabayashi H. Miyake H. Miyata R. Mizuk G. B. Mohanty A. Moll N. Muramatsu R. Mussa E. Nakano M. Nakao Z. Natkaniec M. Nayak E. Nedelkovska C. Ng N. K. Nisar S. Nishida O. Nitoh S. Ogawa S. Okuno P. Pakhlov G. Pakhlova C. W. Park H. Park H. K. Park T. K. Pedlar T. Peng R. Pestotnik M. Petrič L. E. Piilonen M. Ritter M. Röhrken A. Rostomyan H. Sahoo T. Saito Y. Sakai L. Santelj T. Sanuki V. Savinov O. Schneider A. J. Schwartz D. Semmler K. Senyo O. Seon M. E. Sevior M. Shapkin T.-A. Shibata J.-G. Shiu B. Shwartz A. Sibidanov F. Simon Y.-S. Sohn S. Stanič M. Starič M. Steder K. Sumisawa T. Sumiyoshi U. Tamponi G. Tatishvili Y. Teramoto K. Trabelsi M. Uchida T. Uglov Y. Unno S. Uno C. Van Hulse P. Vanhoefer G. Varner K. E. Varvell A. Vinokurova V. Vorobyev M. N. Wagner C. H. Wang M.-Z. Wang P. Wang M. Watanabe Y. Watanabe K. M. Williams E. Won H. Yamamoto Y. Yamashita S. Yashchenko Z. P. Zhang V. Zhilich V. Zhulanov A. Zupanc
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We present a measurement of the branching fractions and charge-parity-(CP-) violating parameters in B -> omega K decays. The results are obtained from the final data sample containing 772 x 10^(6) BBbar pairs collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We obtain the branching fractions B(B0 -> omega K0) = (4.5 +/- 0.4 (stat) +/- 0.3 (syst)) x 10^(-6), B(B- -> omega K-) = (6.8 +/- 0.4 (stat) +/- 0.4 (syst)) x 10^(-6), which are in agreement with their respective current world averages. For the CP violating parameters, we obtain A(B0 -> omega KS) = -0.36 +/- 0.19 (stat) +/- 0.05 (syst), S(B0 -> omega KS) = +0.91 +/- 0.32 (stat) +/- 0.05 (syst), A(B- -> omega K-) = -0.03 +/- 0.04 (stat) +/- 0.01 syst), where A and S represent the direct and mixing-induced CP asymmetry, respectively. We find no evidence of CP violation in the decay channel B-->omega K-; however, we obtain the first evidence of CP violation in the B0 -> omega KS decay channel at the level of 3.1 standard deviations.

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