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| 題名: | Study of the hadronic transitions Υ(2S)→(η,π0)Υ(1S) at Belle |
| 作者: | 陳鎰鋒;Mussa, R.;Aihara, H.;Asner, D. M.;Aushev, T.;Bakich, A. M.;Bondar, A.;Bozek, A.;Bračko, M.;Browder, T. E.;Chen, A.;Chen, P.;Cheon, B. G.;Chilikin, K.;Cho, I.-S.;Cho, K.;Choi, Y.;Dalseno, J.;Drásal, Z.;Dutta, D.;Eidelman, S.;Epifanov, D.;Esen, S.;Farhat, H.;Gillard, R.;Goh, Y. M.;Golob, B.;Hayasaka, K.;Hyun, H. J.;Iijima, T.;Ishikawa, A.;Iwasaki, Y.;Jaegle, I.;Kang, J. H.;Kawasaki, T.;Kim, J. H.;Kim, M. J.;Kim, Y. J.;Klucar, J.;Ko, B. R.;Kodyš, P.;Korpar, S.;Kouzes, R. T.;Križan, P.;Krokovny, P.;Kumita, T.;Kuzmin, A.;Lee, S.-H.;Li, Y.;Liu, C.;Liu, Z. Q.;Liventsev, D.;Miyata, H.;Mizuk, R.;Mohanty, G. B.;Moll, A.;Muramatsu, N.;Natkaniec, Z.;Nishida, S.;Nitoh, O.;Ogawa, S.;Okuno, S.;Olsen, S. L.;Onuki, Y.;Pakhlov, P.;Park, H. K.;Park, K. S.;Pedlar, T. K.;Pestotnik, R.;Petrič, M.;Piilonen, L. E.;Röhrken, M.;Sakai, Y.;Sandilya, S.;Santelj, L.;Sanuki, T.;Schneider, O.;Schwanda, C.;Shibata, T.-A.;Shiu, J.-G.;Shwartz, B.;Smerkol, P.;Sohn, Y.-S.;Solovieva, E.;Sumiyoshi, T.;Tanida, K.;Taniguchi, N.;Tatishvili, G.;Trabelsi, K.;Uno, S.;Hulse, C. Van;Varner, G.;Wang, P.;Wang, X. L.;Watanabe, M.;Watanabe, Y.;Won, E.;Yabsley, B. D.;Yamashita, Y.;Zhang, Z. P.;Zhilich, V. |
| 貢獻者: | 理學院物理學系 |
| 關鍵詞: | ddc:530;info:eu-repo/classification/ddc/530;Physics |
| 日期: | 2013-01-29 |
| 上傳時間: | 2026-04-23 14:32:29 (UTC+8) |
| 出版者: | American Physical Society;American Physical Society (APS) |
| 摘要: | 摘要： We study the rare hadronic transitions $\ensuremath{\Upsilon}(2\mathrm{S})\ensuremath{\rightarrow}\ensuremath{\Upsilon}(1\mathrm{S})\ensuremath{\eta}$ and $\ensuremath{\Upsilon}(2\mathrm{S})\ensuremath{\rightarrow}\ensuremath{\Upsilon}(1\mathrm{S}){\ensuremath{\pi}}^{0}$ using a sample of $158\ifmmode\times\else\texttimes\fi{}{10}^{6}\ensuremath{\Upsilon}(2\mathrm{S})$ decays collected with the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. We measure the ratios of branching fractions $(\mathcal{B})\frac{\mathcal{B}(\ensuremath{\Upsilon}(2\mathrm{S})\ensuremath{\rightarrow}\ensuremath{\Upsilon}(1\mathrm{S})\ensuremath{\eta})}{\mathcal{B}(\ensuremath{\Upsilon}(2\mathrm{S})\ensuremath{\rightarrow}\ensuremath{\Upsilon}(1\mathrm{S}){\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})}=(1.99\ifmmode\pm\else\textpm\fi{}0.14(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.11(\mathrm{syst}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ and $\frac{\mathcal{B}(\ensuremath{\Upsilon}(2\mathrm{S})\ensuremath{\rightarrow}\ensuremath{\Upsilon}(1\mathrm{S}){\ensuremath{\pi}}^{0})}{\mathcal{B}(\ensuremath{\Upsilon}(2\mathrm{S})\ensuremath{\rightarrow}\ensuremath{\Upsilon}(1\mathrm{S}){\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})}l2.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ at the 90% confidence level (CL). Assuming the value $\mathcal{B}(\ensuremath{\Upsilon}(2\mathrm{S})\ensuremath{\rightarrow}\ensuremath{\Upsilon}(1\mathrm{S}){\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+})=(17.92\ifmmode\pm\else\textpm\fi{}0.26)%$, we obtain $\mathcal{B}(\ensuremath{\Upsilon}(2\mathrm{S})\ensuremath{\rightarrow}\ensuremath{\Upsilon}(1\mathrm{S})\ensuremath{\eta})=(3.57\ifmmode\pm\else\textpm\fi{}0.25(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.21(\mathrm{syst}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ and $\mathcal{B}(\ensuremath{\Upsilon}(2\mathrm{S})\ensuremath{\rightarrow}\ensuremath{\Upsilon}(1\mathrm{S}){\ensuremath{\pi}}^{0})l4.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}(90%\mathrm{CL})$.
出版者： American Physical Society (APS)
出版日期： 2013-01-29
出處： Physical Review D, 2013-01, Vol.87 (1)
識別號： ISSN: 1550-7998
識別號： DOI: 10.1103/physrevd.87.011104 |
| 顯示於類別: | [物理學系] 期刊論文
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