K+K- and KsKs Production in Two-Photon Collisions at Belle

Hsuan-Cheng Huang (National Taiwan University) (for the Belle; Collaboration)

arXiv:hep-ex/0104024·hep-ex·August 14, 2019

K+K- and KsKs Production in Two-Photon Collisions at Belle

Hsuan-Cheng Huang (National Taiwan University) (for the Belle, Collaboration)

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TL;DR

This study measures kaon pair production in two-photon collisions at Belle, revealing resonance structures around 1.7 and 1.9 GeV and analyzing their angular distributions to understand underlying spin structures.

Contribution

First measurement of $K^+ K^-$ and $K^0_S K^0_S$ production in two-photon processes at Belle with detailed resonance and angular analyses.

Findings

01

Confirmation of a broad bump at 1.7 GeV in $K^0_S K^0_S$ channel

02

Observation of a bump near 1.9 GeV in $K^+ K^-$ channel

03

Analysis of angular distributions to explore resonance spin structures

Abstract

The production of a kaon pair ( $K^{+} K^{-}$ and $K_{S}^{0} K_{S}^{0}$ ) in two-photon processes has been measured using the Belle detector at the electron-positron collider KEKB. We have obtained the invariant-mass distribution of the processes between 1.3 and 2.3 GeV. A broad bump structure around 1.7 GeV in the $K_{S}^{0} K_{S}^{0}$ channel is confirmed, while, in the $K^{+} K^{-}$ channel, a bump structure is seen near 1.9 GeV. The angular distribution of the final-state kaons is analyzed to explore the spin(-helicity) structure in each invariant-mass region for the two processes. Contributions from existing and postulated resonances are discussed.

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