Measurement of branching fractions for B → J/ψηK decays and search for a narrow resonance in the J/ψη final state

Published

Journal Article

© The Author(s) 2014. We report an observation of the B± → J/ψηK± and B0 → J/ψηK0 S decays using 772 × 106 BB¯ pairs collected at the γ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+ e- collider. We obtain the branching fractions B(B?→ J/ψηK± ) = (1.27 ±0.11(stat.) ±0.11(syst.)) ×10-4 and B(B0 → J/ψηK0 S ) = (5.22 ±0.78(stat.) ± 0.49(syst.)) ×10-5 . We search for a new narrow charmonium(-like) state X in the J/ψη mass spectrum and find no significant excess. We set upper limits on the product of branching fractions, B(B±→ X K± )B(X → J/ψη), at 3872MeVc-2 where aC-odd partner of X(3872) may exist, at ψ(4040) and ψ(4160) assuming their known mass and width, and over a range from 3.8 to 4.8 GeV c-2 . The obtained upper limits at 90% confidence level for XC-odd (3872), ψ(4040), and ψ(4160) are 3.8 ×10-6 , 15.5 ×10-6 , and 7.4 ×10-6 , respectively.

Full Text

Duke Authors

Cited Authors

  • Iwashita, T; Miyabayashi, K; Bhardwaj, V; Adachi, I; Aihara, H; Asner, DM; Aushev, T; Bakich, AM; Bala, A; Bhuyan, B; Bonvicini, G; Bozek, A; Bračko, M; Browder, TE; Chang, MC; Chen, A; Cheon, BG; Chilikin, K; Chistov, R; Cho, K; Chobanova, V; Choi, SK; Choi, Y; Cinabro, D; Dalseno, J; Danilov, M; Doležal, Z; Drásal, Z; Dutta, D; Eidelman, S; Esen, S; Farhat, H; Fast, JE; Feindt, M; Ferber, T; Frey, A; Gaur, V; Gabyshev, N; Ganguly, S; Gillard, R; Goh, YM; Golob, B; Haba, J; Hara, T; Hayasaka, K; Hayashii, H; Higuchi, T; Horii, Y; Hoshi, Y; Hou, WS; Hyun, HJ; Iijima, T; Ishikawa, A; Itoh, R; Iwasaki, Y; Jaegle, I; Julius, T; Kah, DH; Kang, JH; Kato, E; Kawasaki, T; Kichimi, H; Kiesling, C; Kim, DY; Kim, HJ; Kim, HO; Kim, JB; Kim, JH; Kim, MJ; Kim, YJ; Kinoshita, K; Klucar, J; Ko, BR; Kodyšs, P; Korpar, S; Križan, P; Krokovny, P; Kuhr, T; Kumita, T; Kuzmin, A; Kwon, YJ; Lange, JS; Lee, SH; Li, Y; Libby, J; Liu, C; Liu, Y; Lukin, P; Matvienko, D; Miyata, H; Mizuk, R; Moll, A; Mori, T; Nagasaka, Y; Nakano, E; Nakao, M; Nakazawa, H; Natkaniec, Z; Nayak, M; Ng, C

Published Date

  • April 16, 2014

Published In

Volume / Issue

  • 2014 / 4

Electronic International Standard Serial Number (EISSN)

  • 2050-3911

Digital Object Identifier (DOI)

  • 10.1093/ptep/ptu043

Citation Source

  • Scopus