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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2014, vol. 90, p. -

Measurement of branching fractions and CP violation parameters in B →ωK decays with first evidence of CP violation in B0 →ω Ks0

Chobanova V., Dalseno J., Kiesling C., Adachi I., Aihara H., Asner D. M., Aulchenko V., Aushev T., Aziz T., Bakich A. M., Bala A., Ban Y., Belous K., Bhuyan B., Bobrov A., Bonvicini G., Bozek A., Bračko M., Browder T. E., Červenkov D., Chekelian V., Chen A., Cheon B. G., Chilikin K., Chistov R., Cho K., Choi Y., Cinabro D., Danilov M., DoleŽal Z., Drásal Z., Dutta D., Dutta K., Eidelman S., Esen S., Farhat H., Fast J. E., Ferber T., Gaur V., Gabyshev N., Ganguly S., Garmash A., Gillard R., Goh Y. M., Golob B., Haba J., Hayasaka K., He X. H., Horii Y., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Iijima T., Inami K., Ishikawa A., Iwasaki Y., Iwashita T., Jaegle I., Julius T., Kang J. H., Kato E., Kawai H., Kawasaki T., Kim D. Y., Kim H. J., Kim J. B., Kim J. H., Kim M. J., Kim Y. J., Kinoshita K., Klucar J., Ko B. R., Kodyš P., Korpar S., Krokovny P., Kronenbitter B., Kuhr T., Kumita T., Kuzmin A., Lange J. S., Lee S. H., Li J., Li Y., Li Gioi L., Libby J., Liventsev D., Lukin P., Matvienko D., Miyabayashi K., Miyake H., Miyata H., Mizuk R.

We present a measurement of the branching fractions and charge-parity-(CP-)violating parameters in B→ωK decays. The results are obtained from the final data sample containing 772×106 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We obtain the branching fractions B(B0→ωK0)=(4.5±0.4(stat)±0.3(syst))×10-6, B(B+→ωK+)=(6.8±0.4(stat)±0.4(syst))×10-6 which are in agreement with their respective current world averages. For the CP-violating parameters, we obtain AωKS0=-0.36±0.19(stat)±0. 05(syst),SωKS0=+0.91±0.32(stat)±0.05(syst),AωK+=-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+→ωK+; however, we obtain the first evidence of CP violation in the B0→ωKS0 decay channel at the level of 3.1 standard deviations. © 2014 American Physical Society.