Observation of $e^+e^- \to \gamma \chi_{c1}$ and search for $e^+e^- \to \gamma \chi_{c0}, \gamma \chi_{c2},$ and $\gamma\eta_c$ at $\sqrt{s}$ near 10.6 GeV at Belle
- Jia, S.
- Wang, X.L.
- Shen, C.P.
- Yuan, C.Z.
- Adachi, I.
- Aihara, H.
- Al Said, S.
- Asner, D.M.
- Atmacan, H.
- Aulchenko, V.
- Aushev, T.
- Ayad, R.
- Babu, V.
- Bansal, V.
- Behera, P.
- Beleño, C.
- Berger, M.
- Bhuyan, B.
- Bilka, T.
- Biswal, J.
- Bobrov, A.
- Bozek, A.
- Bračko, M.
- Browder, T.E.
- Cao, L.
- Červenkov, D.
- Chang, P.
- Chekelian, V.
- Chen, A.
- Cheon, B.G.
- Chilikin, K.
- Cho, K.
- Choi, S.-K.
- Choi, Y.
- Choudhury, S.
- Cinabro, D.
- Cunliffe, S.
- Dash, N.
- Di Carlo, S.
- Doležal, Z.
- Dong, T.V.
- Eidelman, S.
- Epifanov, D.
- Fast, J.E.
- Ferber, T.
- Frey, A.
- Fulsom, B.G.
- Garg, R.
- Gaur, V.
- Gabyshev, N.
- Garmash, A.
- Gelb, M.
- Giri, A.
- Goldenzweig, P.
- Greenwald, D.
- Haba, J.
- Hayasaka, K.
- Hayashii, H.
- Hou, W.-S.
- Hsu, C.-L.
- Iijima, T.
- Inami, K.
- Inguglia, G.
- Ishikawa, A.
- Itoh, R.
- Iwasaki, M.
- Iwasaki, Y.
- Jacobs, W.W.
- Jin, Y.
- Joffe, D.
- Kahn, J.
- Kaliyar, A.B.
- Karyan, G.
- Kawasaki, T.
- Kichimi, H.
- Kiesling, C.
- Kim, D.Y.
- Kim, H.J.
- Kim, J.B.
- Kim, S.H.
- Kinoshita, K.
- Kodyš, P.
- Korpar, S.
- Kotchetkov, D.
- Križan, P.
- Kroeger, R.
- Krokovny, P.
- Kuhr, T.
- Kulasiri, R.
- Kumar, R.
- Kuzmin, A.
- Kwon, Y.-J.
- Lalwani, K.
- Lange, J.S.
- Lee, I.S.
- Lee, J.Y.
- Lee, S.C.
- Li, C.H.
- Li, L.K.
- Li, Y.B.
- Li Gioi, L.
- Libby, J.
- Liptak, Z.
- Liventsev, D.
- Lu, P.-C.
- Lubej, M.
- Macnaughton, J.
- Masuda, M.
- Matsuda, T.
- Matvienko, D.
- Merola, M.
- Miyata, H.
- Mizuk, R.
- Mori, T.
- Mussa, R.
- Nakano, E.
- Nakao, M.
- Nath, K.J.
- Nayak, M.
- Nisar, N.K.
- Nishida, S.
- Ogawa, S.
- Olsen, S.L.
- Ono, H.
- Onuki, Y.
- Ostrowicz, W.
- Pakhlova, G.
- Pal, B.
- Pardi, S.
- Paul, S.
- Pedlar, T.K.
- Pestotnik, R.
- Piilonen, L.E.
- Popov, V.
- Prencipe, E.
- Ritter, M.
- Rostomyan, A.
- Russo, G.
- Sakai, Y.
- Salehi, M.
- Sandilya, S.
- Santelj, L.
- Sanuki, T.
- Savinov, V.
- Schneider, O.
- Schnell, G.
- Schueler, J.
- Schwanda, C.
- Seino, Y.
- Senyo, K.
- Sevior, M.E.
- Shibata, T.-A.
- Shiu, J.-G.
- Simon, F.
- Sokolov, A.
- Solovieva, E.
- Starič, M.
- Stottler, Z.S.
- Strube, J.F.
- Sumiyoshi, T.
- Sutcliffe, W.
- Takizawa, M.
- Tanida, K.
- Tao, Y.
- Tenchini, F.
- Uchida, M.
- Uehara, S.
- Uglov, T.
- Unno, Y.
- Uno, S.
- Urquijo, P.
- Usov, Y.
- van Tonder, R.
- Varner, G.
- Varvell, K.E.
- Vorobyev, V.
- Waheed, E.
- Wang, B.
- Wang, C.H.
- Wang, M.-Z.
- Wang, P.
- Watanuki, S.
- Widmann, E.
- Won, E.
- Yamamoto, H.
- Yang, S.B.
- Ye, H.
- Yin, J.H.
- Yusa, Y.
- Zhang, Z.P.
- Zhilich, V.
- Zhukova, V.
- Zhulanov, V.
DOIAbstract
International audienceUsing data samples of 89.5 fb-1, 711.0 fb-1, and 121.4 fb-1 collected with the Belle detector at the KEKB asymmetric-energy e+e- collider at center-of-mass energies 10.52, 10.58, and 10.867 GeV, respectively, we study the exclusive reactions e+e-→γχcJ (J=0, 1, 2) and e+e-→γηc. A significant γχc1 signal is observed for the first time at s=10.58 GeV with a significance of 5.1σ including systematic uncertainties. No significant excesses for γχc0, γχc2, and γηc final states are found, and we set 90% credibility level upper limits on the Born cross sections (σB) at 10.52 GeV, 10.58 GeV, and 10.867 GeV. Together with cross sections measured by BESIII at lower center-of-mass energies, the energy dependency of σB(e+e-→γχc1...
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