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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2016, vol. 93, 3, p. -

Study of B0 → ρ+ ρ- Decays and implications for the CKM angle φ 2

Vanhoefer P., Dalseno J., Kiesling C., Abdesselam A., Adachi I., Aihara H., Al Said S., Arinstein K., Asner D. M., Atmacan H., Aushev T., Aziz T., Babu V., Badhrees I., Bakich A. M., Bansal V., Barberio E., Behera P., Bhuyan B., Biswal J., Bobrov A., Bozek A., Bračko M., Browder T. E., Červenkov D., Chang P., Chekelian V., Chen A., Cheon B. G., Chilikin K., Chistov R., Chobanova V., Choi S. K., Choi Y., Cinabro D., Danilov M., Dash N., Dingfelder J., DoleŽal Z., Drásal Z., Dutta D., Eidelman S., Farhat H., Fast J. E., Ferber T., Fulsom B. G., Gaur V., Gabyshev N., Garmash A., Gillard R., Goh Y. M., Goldenzweig P., Golob B., Greenwald D., Haba J., Hamer P., Hara T., Hayasaka K., Hayashii H., He X. H., Horiguchi T., Hou W. S., Iijima T., Inami K., Ishikawa A., Itoh R., Iwasaki Y., Jacobs W. W., Jaegle I., Joffe D., Joo K. K., Julius T., Kang K. H., Kato E., Katrenko P., Kawasaki T., Kim D. Y., Kim H. J., Kim J. B., Kim J. H., Kim K. T., Kim M. J., Kim S. H., Kim Y. J., Kinoshita K.

© 2016 American Physical Society.We present a measurement of the branching fraction and the longitudinal polarization fraction of B0→ρ+ρ- decays, as well as the time-dependent CP violating parameters in decays into longitudinally polarized ρ+ρ- pairs with Belle's final data set of 772×106 BB¯ pairs, at the (4S) resonance, collected at the asymmetric-energy e+e- collider KEKB. We obtain B(B0→ρ+ρ-)=(28.3±1.5(stat)±1.5(syst))×10-6, fL=0.988±0.012(stat)±0.023(syst), ACP=0.00±0.10(stat)±0.06(syst), SCP=-0.13±0.15(stat)±0.05(syst). We perform an isospin analysis to constrain the Cabibbo-Kobayashi-Maskawa angle φ2 and obtain two solutions with φ2=(93.7±10.6)°, being most compatible with other Standard-Model based fits to the data.