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Title: High-statistics study of $$K^0_S$$ pair production in two-photon collisions

Journal Article · · Progress of Theoretical and Experimental Physics
DOI:https://doi.org/10.1093/ptep/ptt097· OSTI ID:1594538
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We report a high-statistics measurement of the differential cross section of the process $$γγ → K^0_S K^0_S$$ in the range 1.05 GeV $≤ W ≤$ 4.00 GeV, where $$W$$ is the center-of-mass energy of the colliding photons, using 972 fb-1 of data collected with the Belle detector at the $KEKB$ asymmetric-energy $e^+ e^-$ collider operated at and near the $$Υ$$-resonance region. The differential cross section is fitted by parameterized S-, D0-, D2-, G0- and G2-wave amplitudes. In the D2 wave, the $$f_2$$(1270), $$a_2$$(1320) and $$f^\prime_2$$(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 $$K\overline{K}$$ state $$Γ_{γγ}(ΒK\overline{K})$$ are extracted for the $$f^\prime_2$$(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 $$Χ_{c0}$$ and $$Χ_{c2}$$ are updated. Possible contributions from the $$Χ_{c0}(2P)$$ and $$Χ_{c2}(2P)$$ states are discussed. A new upper limit for the branching fraction of the $P-$ and $CP-$violating decay channel $$η_c → K^0_S K^0_S$$ is reported. The detailed behavior of the cross section is updated and compared with $QCD$-based calculations.

Research Organization:
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
Contributing Organization:
Belle Collaboration
Grant/Contract Number:
SC0009973
OSTI ID:
1594538
Journal Information:
Progress of Theoretical and Experimental Physics, Vol. 2013, Issue 12; ISSN 2050-3911
Publisher:
Physical Society of JapanCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 33 works
Citation information provided by
Web of Science

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