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arXiv · 1712.02145

Study of $K^0_S$ pair production in single-tag two-photon collisions

Belle Collaboration·M. Masuda·S. Uehara·Y. Watanabe·I. Adachi·J. K. Ahn·H. Aihara·S. Al Said·D. M. Asner·H. Atmacan·V. Aulchenko·T. Aushev·R. Ayad·V. Babu·I. Badhrees·V. Bansal·P. Behera·M. Berger·V. Bhardwaj·B. Bhuyan·J. Biswal·A. Bondar·G. Bonvicini·A. Bozek·M. Bračko·D. Červenkov·A. Chen·B. G. Cheon·K. Chilikin·K. Cho·Y. Choi·S. Choudhury·D. Cinabro·T. Czank·N. Dash·S. Di Carlo·Z. Doležal·Z. Drásal·D. Dutta·S. Eidelman·D. Epifanov·J. E. Fast·T. Ferber·B. G. Fulsom·R. Garg·V. Gaur·N. Gabyshev·A. Garmash·M. Gelb·A. Giri·P. Goldenzweig·E. Guido·J. Haba·K. Hayasaka·H. Hayashii·M. T. Hedges·W. -S. Hou·T. Iijima·K. Inami·G. Inguglia·A. Ishikawa·R. Itoh·M. Iwasaki·Y. Iwasaki·W. W. Jacobs·I. Jaegle·Y. Jin·K. K. Joo·T. Julius·K. H. Kang·G. Karyan·T. Kawasaki·H. Kichimi·C. Kiesling·D. Y. Kim·H. J. Kim·J. B. Kim·K. T. Kim·S. H. Kim·P. Kodyš·D. Kotchetkov·P. Križan·R. Kroeger·P. Krokovny·R. Kulasiri·A. Kuzmin·Y. -J. Kwon·I. S. Lee·S. C. Lee·L. K. Li·Y. Li·L. Li Gioi·J. Libby·D. Liventsev·M. Lubej·T. Luo·T. Matsuda·D. Matvienko·M. Merola·K. Miyabayashi
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Abstract

We report a measurement of the cross section for $K^0_S$ pair production in single-tag two-photon collisions, $\gamma^* \gamma \to K^0_S K^0_S$, for $Q^2$ up to 30 GeV$^2$, where $Q^2$ is the negative of the invariant mass squared of the tagged photon. The measurement covers the kinematic range 1.0 GeV < W < 2.6 GeV and $|\cos \theta^*| < 1.0$ for the total energy and kaon scattering angle, respectively, in the $\gamma^* \gamma$ 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. Finally, the partial decay widths of the $\chi_{c0}$ and $\chi_{c2}$ mesons are measured as a function of $Q^2$.

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Belle Collaboration, M. Masuda, S. Uehara, Y. Watanabe, I. Adachi, J. K. Ahn, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, I. Badhrees, V. Bansal, P. Behera, M. Berger, V. Bhardwaj, B. Bhuyan, J. Biswal, A. Bondar, G. Bonvicini, A. Bozek, M. Bračko, D. Červenkov, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, Y. Choi, S. Choudhury, D. Cinabro, T. Czank, N. Dash, S. Di Carlo, Z. Doležal, Z. Drásal, D. Dutta, S. Eidelman, D. Epifanov, J. E. Fast, T. Ferber, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, M. Gelb, A. Giri, P. Goldenzweig, E. Guido, J. Haba, K. Hayasaka, H. Hayashii, M. T. Hedges, W. -S. Hou, T. Iijima, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, I. Jaegle, Y. Jin, K. K. Joo, T. Julius, K. H. Kang, G. Karyan, T. Kawasaki, H. Kichimi, C. Kiesling, D. Y. Kim, H. J. Kim, J. B. Kim, K. T. Kim, S. H. Kim, P. Kodyš, D. Kotchetkov, P. Križan, R. Kroeger, P. Krokovny, R. Kulasiri, A. Kuzmin, Y. -J. Kwon, I. S. Lee, S. C. Lee, L. K. Li, Y. Li, L. Li Gioi, J. Libby, D. Liventsev, M. Lubej, T. Luo, T. Matsuda, D. Matvienko, M. Merola, K. Miyabayashi. 2017-12-06. Study of $K^0_S$ pair production in single-tag two-photon collisions. https://doi.org/10.1103/physrevd.97.052003

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