Search for B̄0→Λc+Λ̄c- decay at Belle
Uchida, Y.;
Ozaki, H.;
Kichimi, H.;
Adachi, I.;
Aihara, H.;
Arinstein, K.;
Aushev, T.;
Bakich, A.M.;
Balagura, V.;
Barberio, E.
Bay, A.;
Belous, K.;
Bhardwaj, V.;
Bitenc, U.;
Bondar, A.;
Bozek, A.;
Bračko, M.;
Browder, T.E.;
Chang, M.-C.;
Chao, Y.;
Chen, A.;
Chen, W.T.;
Cheon, B.G.;
Chistov, R.;
Cho, I.-S.;
Choi, Y.;
Dalseno, J.;
Dash, M.;
Drutskoy, A.;
Eidelman, S.;
Gabyshev, N.;
Golob, B.;
Ha, H.;
Haba, J.;
Hayasaka, K.;
Hazumi, M.;
Heffernan, D.;
Hoshi, Y.;
Hou, W.-S.;
Hsiung, Y.B.;
Hyun, H.J.;
Ikado, K.;
Inami, K.;
Ishikawa, A.;
Itoh, R.;
Iwabuchi, M.;
Iwasaki, M.;
Iwasaki, Y.;
Kah, D.H.;
Kaji, H.;
Kang, J.H.;
Katayama, N.;
Kawai, H.;
Kawasaki, T.;
Kim, Y.J.;
Kinoshita, K.;
Korpar, S.;
Križan, P.;
Krokovny, P.;
Kuo, C.C.;
Kuzmin, A.;
Kwon, Y.-J.;
Lee, J.S.;
Lee, M.J.;
Lee, S.E.;
Lesiak, T.;
Lin, S.-W.;
Liventsev, D.;
Mandl, F.;
McOnie, S.;
Medvedeva, T.;
Mitaroff, W.;
Miyake, H.;
Miyata, H.;
Miyazaki, Y.;
Mizuk, R.;
Moloney, G.R.;
Nagasaka, Y.;
Nakano, E.;
Nakao, M.;
Nakazawa, H.;
Natkaniec, Z.;
Nishida, S.;
Nitoh, O.;
Nozaki, T.;
Ogawa, S.;
Ohshima, T.;
Okuno, S.;
Olsen, S.L.;
Pakhlov, P.;
Pakhlova, G.;
Park, C.W.;
Park, H.;
Peak, L.S.;
Pestotnik, R.;
Piilonen, L.E.;
Sakai, Y.;
Schneider, O.;
Senyo, K.;
Sevior, M.E.;
Shapkin, M.;
Shen, C.P.;
Shibuya, H.;
Shiu, J.-G.;
Shwartz, B.;
Singh, J.B.;
Somov, A.;
Stanič, S.;
Starič, M.;
Sumiyoshi, T.;
Suzuki, S.Y.;
Takasaki, F.;
Tanaka, M.;
Taylor, G.N.;
Teramoto, Y.;
Tikhomirov, I.;
Ueno, K.;
Uglov, T.;
Unno, Y.;
Uno, S.;
Urquijo, P.;
Usov, Y.;
Varner, G.;
Vervink, K.;
Wang, C.C.;
Wang, C.H.;
Wang, M.-Z.;
Wang, P.;
Watanabe, Y.;
Wedd, R.;
Won, E.;
Yamashita, Y.;
Yamauchi, M.;
Zhang, C.C.;
Zhang, Z.P.;
Zhulanov, V.;
Zupanc, A.;
Zyukova, O.
We search for the doubly charmed baryonic decay B̄0→Λ c+Λ̄c-, in a data sample of 520×106 BB̄ events accumulated at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We find no significant signal and set an upper limit of B(B̄0→Λc+Λ̄c-)<6.2×10-5 at 90% confidence level. The result is significantly below a naive extrapolation from B(B-→Ξc0Λ̄c-) assuming a simple Cabibbo-suppression factor of |Vcd/Vcs|2. The small branching fraction may be attributed to a suppression due to the large momentum of the baryonic decay products, which has been observed in other charmed baryonic two-body B decays. © 2008 The American Physical Society.
Reference
Record created on 2010-11-05, modified on 2017-05-12
