Measurement of K^+K^- production in two-photon collisions in the resonant-mass region

TL;DR

This study measures the cross section of K^+K^- production in two-photon collisions across 1.4 to 2.4 GeV, discovering three new resonant structures and analyzing angular distributions using Belle data.

Contribution

It provides the first detailed measurement of K^+K^- production cross sections and identifies three new resonances in the 1.6 to 2.4 GeV energy range.

Findings

Three new resonant structures discovered between 1.6 and 2.4 GeV.

Cross sections measured for gamma gamma -> K^+ K^-.

Angular differential cross sections obtained.

Abstract

K^+K^- production in two-photon collisions has been studied using a large data sample of 67 fb^{-1} accumulated with the Belle detector at the KEKB asymmetric e^+e^- collider. We have measured the cross section for the process gamma gamma -> K^+ K^- for center-of-mass energies between 1.4 and 2.4 GeV, and found three new resonant structures in the energy region between 1.6 and 2.4 GeV. The angular differential cross sections have also been measured.