Measurement of the branching fraction and CP asymmetry in B0 → π0π0 decays, and an improved constraint on φ2

Here, we measure the branching fraction and CP violation asymmetry in the decay B0 → π0π0 , using a data sample of 752×106B B ¯ pairs collected at the Υ ( 4S ) resonance with the Belle detector at the KEKB e+e- collider. The obtained branching fraction and direct CP asymmetry are B ( B → π0π0 ) = [...

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Bibliographic Details
Published in:Physical review. D 2017-08, Vol.96 (3)
Main Authors: Julius, T., Mohanty, G. B., Adachi, I., Aihara, H., Al Said, S., Asner, D. M., Aulchenko, V., Badhrees, I., Bakich, A. M., Barberio, E., Barrett, M., Bhardwaj, V., Biswal, J., Bloomfield, T., Bondar, A., Bozek, A., Bračko, M., Browder, T. E., Červenkov, D., Chang, M. -C., Chekelian, V., Chen, A., Chilikin, K., Cho, K., Cinabro, D., Drásal, Z., Dutta, D., Fast, J. E., Ferber, T., Gaur, V., Gillard, R., Haba, J., Hara, T., Hayashii, H., Hou, W. -S., Hsu, C. -L., Iijima, T., Inami, K., Ishikawa, A., Itoh, R., Jaegle, I., Joo, K. K., Kahn, J., Kiesling, C., Kim, D. Y., Kim, J. B., Kim, K. T., Kinoshita, K., Kotchetkov, D., Križan, P., Kuhr, T., Kuzmin, A., Kwon, Y. -J., Lange, J. S., Li, C. H., Li Gioi, L., Luo, T., MacNaughton, J., Masuda, M., Merola, M., Miyata, H., Moon, H. K., Mori, T., Nisar, N. K., Ogawa, S., Pakhlov, P., Pal, B., Pardi, S., Park, C. -S., Pesántez, L., Pestotnik, R., Piilonen, L. E., Ritter, M., Sahoo, H., Sakai, Y., Santelj, L., Sato, Y., Schneider, O., Schwanda, C., Seino, Y., Shiu, J. -G., Starič, M., Tanida, K., Tenchini, F., Trabelsi, K., Uchida, M., Uehara, S., Uglov, T., Usov, Y., Varner, G., Waheed, E., Wang, C. H., Wang, M. -Z., Wang, P., Watanabe, Y., Widmann, E., Won, E., Yamashita, Y., Zhang, Z. P., Zhulanov, V.
Format: Article
Language:English
Subjects:
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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Summary:Here, we measure the branching fraction and CP violation asymmetry in the decay B0 → π0π0 , using a data sample of 752×106B B ¯ pairs collected at the Υ ( 4S ) resonance with the Belle detector at the KEKB e+e- collider. The obtained branching fraction and direct CP asymmetry are B ( B → π0π0 ) = [ 1.31±0.19 ( stat ) ±0.19 ( syst ) ] ×10-6 and ACP=+0.14±0.36 ( stat ) ±0.10 ( syst ) , respectively. The signal significance, including the systematic uncertainty, is 6.4 standard deviations. Furthemore, we combine these results with Belle’s earlier measurements of B0 → π+π- and B± → π±π0 to exclude the CP -violating parameter φ2 from the range 15.5°
ISSN:2470-0010