Observation of ϒ(4S)→η^{'}ϒ(1S). E Guido , R Mussa , U Tamponi , H Aihara , S Al Said , D M Asner , H Atmacan , V Aulchenko , T Aushev , R Ayad , V Babu , I Badhrees , A M Bakich , V Bansal , P Behera , M Berger , V Bhardwaj , J Biswal , A Bondar , G Bonvicini , A Bozek , M Bračko , T E Browder , D Červenkov , V Chekelian , A Chen , B G Cheon , K Chilikin , K Cho , S-K Choi , Y Choi , S Choudhury , D Cinabro , S Cunliffe , S Di Carlo , Z Doležal , S Eidelman , D Epifanov , J E Fast , T Ferber , B G Fulsom , R Garg , V Gaur , N Gabyshev , A Garmash , M Gelb , A Giri , P Goldenzweig , J Haba , T Hara , H Hayashii , M T Hedges , W-S Hou , K Inami , G Inguglia , A Ishikawa , R Itoh , M Iwasaki , Y Iwasaki , W W Jacobs , H B Jeon , S Jia , Y Jin , T Julius , K H Kang , G Karyan , T Kawasaki , C Kiesling , D Y Kim , J B Kim , K T Kim , S H Kim , K Kinoshita , P Kodyš , S Korpar , D Kotchetkov , P Križan , R Kroeger , P Krokovny , R Kulasiri , R Kumar , T Kumita , A Kuzmin , Y-J Kwon , I S Lee , S C Lee , L K Li , Y B Li , L Li Gioi , J Libby , D Liventsev , M Lubej , T Luo , J MacNaughton , M Masuda , T Matsuda , D Matvienko , M Merola , K Miyabayashi , H Miyata , R Mizuk , G B Mohanty , H K Moon , T Mori , E Nakano , M Nakao , T Nanut , K J Nath , M Nayak , M Niiyama , S Nishida , S Ogawa , H Ono , W Ostrowicz , G Pakhlova , B Pal , S Pardi , C W Park , S Paul , T K Pedlar , R Pestotnik , L E Piilonen , V Popov , A Rostomyan , G Russo , Y Sakai , M Salehi , T Sanuki , O Schneider , G Schnell , C Schwanda , Y Seino , V Shebalin , C P Shen , T-A Shibata , J-G Shiu , B Shwartz , A Sokolov , M Starič , J F Strube , M Sumihama , T Sumiyoshi , M Takizawa , K Tanida , F Tenchini , M Uchida , T Uglov , Y Unno , Y Usov , C Van Hulse , G Varner , A Vinokurova , B Wang , C H Wang , M-Z Wang , P Wang , X L Wang , M Watanabe , Y Watanabe , E Widmann , E Won , H Ye , J Yelton , C Z Yuan , Y Yusa , S Zakharov , Z P Zhang , V Zhilich , V Zhukova , V Zhulanov PHYSICAL REVIEW LETTERS（2018）
摘要
We report the first observation of the hadronic transition Upsilon(4S) -> eta'Upsilon(1S), using 496 fb(-1) data collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We reconstruct the eta' meson through its decays to rho(0)Upsilon and to pi(+)pi(-)eta, with eta -> gamma gamma. We measure B(Upsilon(4S) -> eta'Upsilon(1S)) = [3.43 +/- 0.88(stat) +/- 0.21(syst)] x 10(-5), with a significance of 5.7 sigma.
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