Study of KS0 pair production in single-tag two-photon collisions
We report a measurement of the cross section for KS0 pair production in single-tag two-photon collisions, γ∗γ→KS0KS0, for Q2 up to 30 GeV2, where Q2 is the negative of the invariant mass squared of the tagged photon. The measurement covers the kinematic range 1.0 GeV<2.6 GeV and |cosθ∗|<1.0 for the total energy and kaon scattering angle, respectively, in the γ∗γ center-of-mass system. These results are based on a data sample of 759 fb-1 collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. For the first time, the transition form factor of the f2′(1525) meson is measured separately for the helicity-0, -1, and -2 components and also compared with theoretical calculations. We have derived the cross section for the process for W<2.6 GeV from 121 signal candidate events. Finally, the γ∗γ partial decay widths of the χc0 and χc2 mesons are measured as a function of Q2 based on 10 candidate events in total.
Masuda, M; Uehara, S; Watanabe, Y; Adachi, I; Ahn, JK; Aihara, H; Al Said, S; Asner, DM; Atmacan, H; Aulchenko, V; Aushev, T; Ayad, R; Babu, V; Badhrees, I; Bansal, V; Behera, P; Berger, M; Bhardwaj, V; Bhuyan, B; Biswal, J; Bondar, A; Bonvicini, G; Bozek, A; Bračko, M; Červenkov, D; Chen, A; Cheon, BG; Chilikin, K; Cho, K; Choi, Y; Choudhury, S; Cinabro, D; Czank, T; Dash, N; Di Carlo, S; DoleŽal, Z; Drásal, Z; Dutta, D; Eidelman, S; Epifanov, D; Fast, JE; Ferber, T; Fulsom, BG; Garg, R; Gaur, V; Gabyshev, N; Garmash, A; Gelb, M; Giri, A; Goldenzweig, P; Guido, E; Haba, J; Hayasaka, K; Hayashii, H; Hedges, MT; Hou, WS; Iijima, T; Inami, K; Inguglia, G; Ishikawa, A; Itoh, R; Iwasaki, M; Iwasaki, Y; Jacobs, WW; Jaegle, I; Jin, Y; Joo, KK; Julius, T; Kang, KH; Karyan, G; Kawasaki, T; Kichimi, H; Kiesling, C; Kim, DY; Kim, HJ; Kim, JB; Kim, KT; Kim, SH; Kodyš, P; Kotchetkov, D; KriŽan, P; Kroeger, R; Krokovny, P; Kulasiri, R; Kuzmin, A; Kwon, YJ; Lee, IS; Lee, SC; Li, LK; Li, Y; Li Gioi, L; Libby, J; Liventsev, D; Lubej, M; Luo, T; Matsuda, T; Matvienko, D; Merola, M; Miyabayashi, K; Miyata, H
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