Observation of the Radiative Decays of ϒ(1S) to χ_{c1}.

P Katrenko,I Adachi,H Aihara,S Al Said,D M Asner,T Aushev,I Badhrees,S Bahinipati,P Behera, C Beleño,J Bennett,V Bhardwaj,B Bhuyan, J Biswal,A Bobrov,G Bonvicini,M Bračko,M Campajola, L Cao,D Červenkov,V Chekelian,A Chen, B G Cheon,K Chilikin,H E Cho,K Cho,S-K Choi,Y Choi,S Choudhury,D Cinabro,S Cunliffe,F Di Capua,S Di Carlo,Z Doležal,T V Dong,S Eidelman,D Epifanov,J E Fast, B G Fulsom,R Garg,V Gaur,N Gabyshev,A Garmash,A Giri, P Goldenzweig, B Golob,O Grzymkowska,O Hartbrich, K Hayasaka, H Hayashii,W-S Hou,T Iijima,K Inami,A Ishikawa,R Itoh,M Iwasaki, Y Iwasaki,W W Jacobs,H B Jeon,S Jia, Y Jin,D Joffe, K K Joo,G Karyan,H Kichimi,D Y Kim,K T Kim, S H Kim,K Kinoshita, P Kodyš, S Korpar, P Križan,R Kroeger,T Kuhr,I S Lee,S C Lee,P Lewis, Y B Li,L Li Gioi,J Libby, K Lieret,C MacQueen, M Masuda,T Matsuda,D Matvienko,M Merola,K Miyabayashi,H Miyata,R Mizuk, G B Mohanty, T J Moon, T Mori,R Mussa, E Nakano, T Nakano, M Nakao,M Nayak,N K Nisar,S Nishida,K Nishimura,H Ono, Y Onuki,P Oskin,P Pakhlov,G Pakhlova,T Pang,S Pardi,C W Park,H Park,S-H Park,S Paul, T K Pedlar, R Pestotnik, L E Piilonen,V Popov, E Prencipe,M T Prim,M Ritter,A Rostomyan,N Rout,G Russo,D Sahoo, Y Sakai,S Sandilya,T Sanuki, V Savinov,O Schneider, G Schnell, J Schueler, C Schwanda, Y Seino,K Senyo,M E Sevior, C P Shen,J-G Shiu,E Solovieva, M Starič, Z S Stottler, T Sumiyoshi, W Sutcliffe,M Takizawa,U Tamponi,K Tanida, F Tenchini,K Trabelsi,M Uchida, S Uehara,T Uglov, Y Unno,S Uno, P Urquijo,Y Usov,R Van Tonder, G Varner,A Vossen,B Wang,C H Wang,M-Z Wang,P Wang,X L Wang,E Won, S B Yang,H Ye, J Yelton, J H Yin,C Z Yuan,Y Yusa, Z P Zhang,V Zhilich, V Zhukova

PHYSICAL REVIEW LETTERS（2020）

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摘要

We report the first observation of the radiative decay of the Upsilon(1S) into a charmonium state. The significance of the observed signal of Upsilon(1S) -> gamma chi(c1) is 6.3 standard deviations including systematics. The branching fraction is calculated to be B[Upsilon(1S) -> gamma chi(c1)] = [4.7(-1.8)(+2.4) (stat)(-0.5)(+0.4) (sys) x 10(-5)]. We also searched for Upsilon(1S) radiative decays into chi(c0.2) and eta(c)(1S, 2S), and set upper limits on their branching fractions. These results are obtained from a 24.9 fb(-1) data sample collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider at a center-of-mass energy equal to the Upsilon(2S) mass using Upsilon(1S) tagging by the Upsilon(2S) -> Upsilon(1S)pi(+)pi(-) transitions.

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