S. Uehara (Author), Marko Bračko (Author), Boštjan Golob (Author), Jure Klučar (Author), Samo Korpar (Author), Peter Križan (Author), Rok Pestotnik (Author), Marko Petrič (Author), Marko Starič (Author), Luka Šantelj (Author), Anže Zupanc (Author)

Abstract

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.

Keywords

C00;C05;C07;C21;quantum chromodynamics;quark model;particle properties;lepton collider experiments;experimental particle physics;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FKKT - Faculty of Chemistry and Chemical Engineering
UDC: 539.1
COBISS: 27459367 Link will open in a new window
ISSN: Y507-3596
Views: 877
Downloads: 108
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Other data

Secondary language: Slovenian
Secondary keywords: C00;C05;C07;C21;kvantna kromodinamika;kvarkovski model;lastnosti delcev;eksperimenti;leptonski trkalnik;eksperimentalna fizika delcev;
URN: URN:SI:UM:
Type (COBISS): Scientific work
Pages: str. 123C01-1-123C01-45
Volume: ǂVol. ǂ2013
Issue: ǂno. ǂ12
Chronology: 2013
DOI: 10.1093/ptep/ptt097
ID: 10850529