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Teramoto, Y; Aihara, H; Atmacan, H; Aushev, T; Ayad, R; Bennett, J; Bhardwaj, V; Bhuyan, B; Bonvicini, G; Bozek, A; Campajola, M; Chang, M-C; Chen, A; Cho, K; Choi, Y; Choudhury, S; De Nardo, G; Di Capua, F; Eidelman, S; Ferber, T; Fulsom, B G; Garg, R; Garmash, A; Giri, A; Hara, T; Hartbrich, O; Hayashii, H; Hernandez Villanueva, M; Hou, W-S; Iijima, T; Inami, K; Inguglia, G; Jacobs, W W; Jang, E-J; Jia, S; Jin, Y; Kahn, J; Kichimi, H; Kiesling, C; Kim, B H; Kim, D Y; Kim, S H; Kimmel, T D; Kotchetkov, D; Kroeger, R; Kulasiri, R; Kumar, R; Kumara, K; Lange, J S; Lee, S C; Li, L K; Li, Y B; Lieret, K; Liptak, Z; Liventsev, D; Merola, M; Mohanty, G B; Nakao, M; Nakazawa, H; Natkaniec, Z; Natochii, A; Nishida, S; Ogawa, K; Park, S-H; Patra, S; Paul, S; Podobnik, T; Ritter, M; Rout, N; Russo, G; Sahoo, D; Sakai, Y; Sangal, A; Sanuki, T; Schueler, J; Seino, Y; Sevior, M E; Shebalin, V; Solovieva, E; Sumiyoshi, T; Sutcliffe, W; Takizawa, M; Uchida, M; Uglov, T; Unno, Y; Uno, S; Urquijo, P; Van Tonder, R; Vinokurova, A; Waheed, E; Wang, C H; Wang, M-Z; Wang, P; Won, E; Xu, X; Yang, S B; Ye, H; Yelton, J; Yin, J H; Zhukova, V
Physical review letters, 2021-Mar-26, 20210326, Letnik: 126, Številka: 12Journal Article
We report the first evidence for X(3872) production in two-photon interactions by tagging either the electron or the positron in the final state, exploring the highly virtual photon region. The search is performed in e^{+}e^{-}→e^{+}e^{-}J/ψπ^{+}π^{-}, using 825 fb^{-1} of data collected by the Belle detector operated at the KEKB e^{+}e^{-} collider. We observe three X(3872) candidates, where the expected background is 0.11±0.10 events, with a significance of 3.2σ. We obtain an estimated value for Γover ˜_{γγ}B(X(3872)→J/ψπ^{+}π^{-}) assuming the Q^{2} dependence predicted by a ccover ¯ meson model, where -Q^{2} is the invariant mass squared of the virtual photon. No X(3915)→J/ψπ^{+}π^{-} candidates are found.
