English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We report a high-statistics measurement of the differential cross section ofthe process gamma gamma --> 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 972fb^{-1} of data collected with the Belle detector at the KEKB asymmetric-energye^+ e^- collider operated at and near the Upsilon-resonance region. Thedifferential cross section is fitted by parameterized S-, D_0-, D_2-, G_0- andG_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) andpossibly the f_0(2500) are seen in the S wave. The mass, total width andproduct of the two-photon partial decay width and decay branching fraction tothe K bar{K} state Gamma_{gamma gamma}B(K bar{K}) are extracted for thef_2'(1525), f_0(1710), f_2(2200) and f_0(2500). The destructive interferencebetween the f_2(1270) and a_2(1320) is confirmed by measuring their relativephase. The parameters of the charmonium states chi_{c0} and chi_{c2} areupdated. Possible contributions from the chi_{c0}(2P) and chi_{c2}(2P) statesare discussed. A new upper limit for the branching fraction of the P- andCP-violating decay channel eta_c --> K^0_S K^0_S is reported. The detailedbehavior of the cross section is updated and compared with QCD-basedcalculations.

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