Вы находитесь на старом сайте НГУ. Перейти на новый сайт

ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2013, vol. 88, p. -

Measurement of the CP violation parameters in B0→π+π- decays

Dalseno J., Prothmann K., Kiesling C., Adachi I., Aihara H., Arinstein K., Asner D. M., Aulchenko V., Aushev T., Bakich A. M., Bala A., Bay A., Behera P., Bhardwaj V., Bhuyan B., Bondar A., Bonvicini G., Bozek A., Bračko M., Browder T. E., Chekelian V., Chen A., Chen P., Cheon B. G., Chilikin K., Chistov R., Cho K., Chobanova V., Choi S. K., Choi Y., Cinabro D., Danilov M., Doležal Z., Drásal Z., Drutskoy A., Dutta D., Dutta K., Eidelman S., Farhat H., Fast J. E., Feindt M., Ferber T., Frey A., Gaur V., Ganguly S., Gillard R., Goh Y. M., Golob B., Haba J., Hara T., Hayasaka K., Hayashii H., Higuchi T., Hoshi Y., Hou W. S., Hyun H. J., Iijima T., Ishikawa A., Itoh R., Iwasaki Y., Julius T., Kah D. H., Kato E., Kawai H., Kawasaki T., Kim D. Y., Kim H. J., Kim J. B., Kim J. H., Kim K. T., Kim Y. J., Kinoshita K., Klucar J., Ko B. R., Kodyš P., Korpar S., Križan P., Krokovny P., Kronenbitter B., Kuzmin A., Kwon Y. J., Lee S. H., Li J., Li Y., Li Gioi L., Libby J., Liu C., Liventsev D., Lukin P., Matvienko D.

We present a measurement of the charge-parity (CP) violating parameters in B0→π+π- 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 CP violation parameters ACP(B0→π+π-)=+0.33±0.06(stat)±0.03(syst),SCP(B0→π+π-)=-0.64±0.08(stat)±0.03(syst),where ACP and SCP represent the direct and mixing-induced CP asymmetries in B0→π+π- decays, respectively. Using an isospin analysis including results from other Belle measurements, we find 23.8 <φ2<66.8 is disfavored at the 1σ level, where φ2 is one of the three interior angles of the Cabibbo-Kobayashi-Maskawa unitarity triangle related to Bu,d decays. © 2013 American Physical Society.