Study of Ks0 pair production in single-tag two-photon collisions

Masuda, M.; Uehara, S.; Watanabe, Y.; Adachi, I.; Ahn, J.  k.; Aihara, H.; Al Said, S.; Asner, D.  m.; 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, B.  g.; 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, J.  e.; Ferber, T.; Fulsom, B.  g.; Garg, R.; Gaur, V.; Gabyshev, N.; Garmash, A.; Gelb, M.; Giri, A.; Goldenzweig, P.; Guido, E.; Haba, J.; Hayasaka, K.; Hayashii, H.; Hedges, M.  t.; Hou, W. -S.; Iijima, T.; Inami, K.; Inguglia, G.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Iwasaki, Y.; Jacobs, W.  w.; Jaegle, I.; Jin, Y.; Joo, K.  k.; Julius, T.; Kang, K.  h.; Karyan, G.; Kawasaki, T.; Kichimi, H.; Kiesling, C.; Kim, D.  y.; Kim, H.  j.; Kim, J.  b.; Kim, K.  t.; Kim, S.  h.; Kodyš, P.; Kotchetkov, D.; Križan, P.; Kroeger, R.; Krokovny, P.; Kulasiri, R.; Kuzmin, A.; Kwon, Y. -J.; Lee, I.  s.; Lee, S.  c.; L.  k., Li; Li, Y.; Li Gioi, L.; Libby, J.; Liventsev, D.; Lubej, M.; Luo, T.; Matsuda, T.; Matvienko, D.; Merola, M.; Miyabayashi, K.; Miyata, H.; Mizuk, R.; Mohanty, G.  b.; Moon, H.  k.; Mori, T.; Mussa, R.; Nakao, M.; Nakazawa, H.; Nanut, T.; Nath, K.  j.; Natkaniec, Z.; Nayak, M.; Niiyama, M.; Nisar, N.  k.; Nishida, S.; Ogawa, S.; Okuno, S.; Ono, H.; Onuki, Y.; Pakhlov, P.; Pakhlova, G.; Pal, B.; Park, H.; Paul, S.; Pedlar, T.  k.; Pestotnik, R.; Piilonen, L.  e.; Ritter, M.; Rostomyan, A.; Russo, G.; Sakai, Y.; Salehi, M.; Sandilya, S.; Santelj, L.; Sanuki, T.; Savinov, V.; Schneider, O.; Schnell, G.; Schwanda, C.; Seidl, R.; Seino, Y.; Senyo, K.; Seon, O.; Sevior, M.  e.; Shebalin, V.; Shen, C.  p.; Shibata, T. -A.; Shimizu, N.; Shiu, J. -G.; Shwartz, B.; Sokolov, A.; Solovieva, E.; Starič, M.; Strube, J.  f.; Sumihama, M.; Sumiyoshi, T.; Takizawa, M.; Tamponi, U.; Tanida, K.; Tenchini, F.; Teramoto, Y.; Uchida, M.; Uglov, T.; Unno, Y.; Uno, S.; Urquijo, P.; Van Hulse, C.; Varner, G.; Vinokurova, A.; Vorobyev, V.; Vossen, A.; Wang, B.; Wang, C.  h.; Wang, M. -Z.; Wang, P.; Wang, X.  l.; Watanabe, M.; Widmann, E.; Won, E.; Ye, H.; Yuan, C.  z.; Yusa, Y.; Zakharov, S.; Zhang, Z.  p.; Zhilich, V.; Zhukova, V.; Zhulanov, V.; Zupanc, A.

doi:10.1103/physrevd.97.052003

We report a measurement of the cross section for Ks0 pair production in single-tag two-photon collisions, γ*⁢γ→Ks0 Ks0, 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 |cos⁡θ*|<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 f'2⁡(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 χc⁢0 and χc⁢2 mesons are measured as a function of Q2 based on 10 candidate events in total.