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Title: High-statistics study of $K^0_S K^0_S$ pair production in two-photon collisions Uehara, S. (Author)Bračko, Marko (Author)Golob, Boštjan (Author)Klučar, Jure (Author)Korpar, Samo (Author)Križan, Peter (Author)Pestotnik, Rok (Author)Petrič, Marko (Author)Starič, Marko (Author)Šantelj, Luka (Author)Zupanc, Anže (Author), et al. Progress_of_Theoretical_and_Experimental_Physics_2013_Uehara_et_al._High-statistics_study_of_KsubSsup0_pair_production_in_two-photon_col.pdf (2,28 MB)  https://academic.oup.com/ptep/article-lookup/doi/10.1093/ptep/ptt097 English Scientific work (r2) 1.01 - Original Scientific Article FKKT - Faculty of Chemistry and Chemical Engineering We report a high-statistics measurement of the differential cross section of the process $\gamma \gamma \to K^0_S K^0_S$ in the range $1.05\,{\mathrm {GeV}} \leq W \leq 4.00$ , where W is the center-of-mass energy of the colliding photons, using 972 $^{-1}$ of data collected with the Belle detector at the KEKB asymmetric-energy e+e− collider operated at and near the $\Upsilon$-resonance region. The differential cross section is fitted by parameterized S-, $D_0$, $D_2$-, $G_0$-, and $G_2$-wave amplitudes. In the $D_2$ wave, the $f_2$(1270), $a_2$(1320), and $f′_2$(1525) are dominant and a resonance, the $f_2$(2200), is also present. The $f_0$(1710) and possibly the $f_0$(2500) are seen in the S wave. The mass, total width, and product of the two-photon partial decay width and decay branching fraction to the $K \bar {K}$ state $\Gamma _{\gamma \gamma }\mathcal {B}(K \bar {K})$ are extracted for the $f′_2$(1525), $f_0$(1710), $f_2$(2200), and $f_0$(2500). The destructive interference between the $f_2$(1270) and $a_2$(1320) is confirmed by measuring their relative phase. The parameters of the charmonium states $\chi _{c0}$ and $\chi _{c2}$ are updated. Possible contributions from the $\chi _{c0}(2P)$ and $\chi _{c2}(2P)$ states are discussed. A new upper limit for the branching fraction of the P- and CP-violating decay channel $\eta _c \to K^0_S K^0_S$ is reported. The detailed behavior of the cross section is updated and compared with QCD-based calculations. C00, C05, C07, C21, quantum chromodynamics, quark model, particle properties, lepton collider experiments, experimental particle physics 2013 str. 1-45 št. 12, Letn. 2013 2050-3911 539.1 2050-3911 27459367 10.1093/ptep/ptt097 URN:SI:UM:DK:BDHIMT0R This work is available under this license: Creative Commons Attribution 4.0 International 344 33 Misc.

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Title: Progress of Theoretical and Experimental Physics Prog. Theor. Exp. Phys. Oxford University Press 2050-3911 2704635

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Language: Slovenian C00, C05, C07, C21, kvantna kromodinamika, kvarkovski model, lastnosti delcev, eksperimenti, leptonski trkalnik, eksperimentalna fizika delcev