Observation of the Radiative Decays of $\Upsilon(1S)$ to $\chi_{c1}$
- Katrenko, P.
- Adachi, I.
- Aihara, H.
- Al Said, S.
- Asner, D.M.
- Aushev, T.
- Badhrees, I.
- Bahinipati, S.
- Behera, P.
- Beleño, C.
- Bennett, J.
- Bhardwaj, V.
- Bhuyan, B.
- Biswal, J.
- Bobrov, A.
- Bonvicini, G.
- Bračko, M.
- Campajola, M.
- Cao, L.
- Červenkov, D.
- Chekelian, V.
- Chen, A.
- Cheon, B.G.
- Chilikin, K.
- Cho, H.E.
- Cho, K.
- Choi, S.-K.
- Choi, Y.
- Choudhury, S.
- Cinabro, D.
- Cunliffe, S.
- Di Capua, F.
- Di Carlo, S.
- Doležal, Z.
- Dong, T.V.
- Eidelman, S.
- Epifanov, D.
- Fast, J.E.
- Fulsom, B.G.
- Garg, R.
- Gaur, V.
- Gabyshev, N.
- Garmash, A.
- Giri, A.
- Goldenzweig, P.
- Golob, B.
- Grzymkowska, O.
- Hartbrich, O.
- Hayasaka, K.
- Hayashii, H.
- Hou, W.-S.
- Iijima, T.
- Inami, K.
- Ishikawa, A.
- Itoh, R.
- Iwasaki, M.
- Iwasaki, Y.
- Jacobs, W.W.
- Jeon, H.B.
- Jia, S.
- Jin, Y.
- Joffe, D.
- Joo, K.K.
- Karyan, G.
- Kichimi, H.
- Kim, D.Y.
- Kim, K.T.
- Kim, S.H.
- Kinoshita, K.
- Kodyš, P.
- Korpar, S.
- Kroeger, R.
- Kuhr, T.
- Lee, I.S.
- Lee, S.C.
- Lewis, P.
- Li, Y.B.
- Li Gioi, L.
- Libby, J.
- Lieret, K.
- Macqueen, C.
- Masuda, M.
- Matsuda, T.
- Matvienko, D.
- Merola, M.
- Miyabayashi, K.
- Miyata, H.
- Mizuk, R.
- Mohanty, G.B.
- Moon, T.J.
- Mori, T.
- Mussa, R.
- Nakano, E.
- Nakano, T.
- Nakao, M.
- Nayak, M.
- Nisar, N.K.
- Nishida, S.
- Nishimura, K.
- Ono, H.
- Onuki, Y.
- Oskin, P.
- Pakhlov, P.
- Pakhlova, G.
- Pang, T.
- Pardi, S.
- Park, C.W.
- Park, H.
- Park, S.-H.
- Paul, S.
- Pedlar, T.K.
- Pestotnik, R.
- Piilonen, L.E.
- Popov, V.
- Prencipe, E.
- Prim, M.T.
- Ritter, M.
- Rostomyan, A.
- Rout, N.
- Russo, G.
- Sahoo, D.
- Sakai, Y.
- Sandilya, S.
- Sanuki, T.
- Savinov, V.
- Schneider, O.
- Schnell, G.
- Schueler, J.
- Schwanda, C.
- Seino, Y.
- Senyo, K.
- Sevior, M.E.
- Shen, C.P.
- Shiu, J.-G.
- Solovieva, E.
- Starič, M.
- Stottler, Z.S.
- Sumiyoshi, T.
- Sutcliffe, W.
- Takizawa, M.
- Tamponi, U.
- Tanida, K.
- Tenchini, F.
- Trabelsi, K.
- Uchida, M.
- Uehara, S.
- Uglov, T.
- Unno, Y.
- Uno, S.
- Urquijo, P.
- Usov, Y.
- van Tonder, R.
- Varner, G.
- Vossen, A.
- Wang, B.
- Wang, C.H.
- Wang, M.-Z.
- Wang, P.
- Wang, X.L.
- Won, E.
- Yang, S.B.
- Ye, H.
- Yelton, J.
- Yin, J.H.
- Yuan, C.Z.
- Yusa, Y.
- Zhang, Z.P.
- Zhilich, V.
- Zhukova, V.
DOIAbstract
International audienceWe report the first observation of the radiative decay of the ϒ(1S) into a charmonium state. The significance of the observed signal of ϒ(1S)→γχc1 is 6.3 standard deviations including systematics. The branching fraction is calculated to be B[ϒ(1S)→γχc1]=[4.7-1.8+2.4(stat)-0.5+0.4(sys)×10-5]. We also searched for ϒ(1S) radiative decays into χc0,2 and ηc(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 ϒ(2S) mass using ϒ(1S) tagging by the ϒ(2S)→ϒ(1S)π+π- transitions
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