First observations of B$0\atop{2}$ → J/ψη and B$0\atop{2}$ → J/ψη

• Published in: Physical review letters 2012-05, Vol.108 (18)
• Main Authors: Li, J., Adachi, I., Arinstein, K., Asner, David M., Bhardwaj, V., Bhuyan, Bipul, Bozek, A., Bracko, Marko, Brovchenko, O., Browder, Thomas E., Chen, A., Chen, P., Cheon, B. G., Chistov, R., Cho, K., Choi, Y., Dalseno, J., Dolezal, Z., Drutskoy, A., Eidelman, S., Fast, James E., Garmash, Alexey, Haba, J., Hayashii, H., Horii, Y., Hoshi, Y., Hyun, H. J., Iijima, Toru, Inami, K., Ishikawa, A., Iwabuchi, Masaya, Iwasaki, Y., Iwashita, T., Julius, T., Kang, J. H., Kapusta, P., Kawasaki, T., Kim, H. J., Kim, J. B., Kim, K. T., Kim, M. J., Kim, Y. J., Ko, Byeong Rok, Kobayashi, N., Korpar, S., Kuhr, Thomas, Kumar, R., Lange, J. S., Lee, S. H., Libby, J., Liu, Y., Matvienko, D., McOnie, S., Miyazaki, Y., Mori, T., Muramatsu, N., Nakamura, I., Nakazawa, H., Natkaniec, Z., Nishimura, K., Nitoh, O., Ohshima, T., Okuno, S., Olsen, Stephen L., Ostrowicz, W., Pakhlova, Galina, Park, C. W., Park, H. K., Pedlar, Todd K., Peng, T., Pestotnik, Rok, Petric, Marko, Prim, M., Ryu, S., Sahoo, Himansu B., Sakai, K., Sakai, Yoshihide, Sato, Y., Schneider, O., Schwanda, C., Schwartz, Alan J., Senyo, K., Shiu, Jing-Ge, Smerkol, P., Sohn, Young-Soo, Stanic, S., Sumihama, M., Sumiyoshi, T., Tanaka, Satoru, Uchida, M., Unno, Yuji, Uno, S., Varvell, K. E., Wang, P., Watanabe, Y., Williams, K. M., Won, Eun Il, Yamashita, Y., Yuan, C. Z., Zhilich, V.
• Format: Article
• Language: English
• Subjects: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.108.181808

We report first observations of B$0\atop{2}$→J/ψη and B$0\atop{2}$→J/ψη'. The results are obtained from 121.4 fb-1 of data collected at the Υ(5S) resonance with the Belle detector at the KEKB e+e- collider. We obtain the branching fractions B(B$0\atop{2}$→J/ψη)=[5.10±0.50(stat)±0.25(syst)-0.79+1.14(NBs(*)$\bar{B}$ s(*))]×10-4, and B(B$0\atop{2}$→J/ψη')=[3.71±0.61(stat)±0.18(syst)-0.57+0.83(NBs(*)$\bar{B}$ s(*))]×10-4. The ratio of the two branching fractions is measured to be B(Bs→J/ψη')/B(Bs→J/ψη)=0.73±0.14(stat)±0.02(syst).