Study of the K+K- Interaction at COSY-11

TL;DR

This paper investigates the near-threshold production of K+K- pairs in proton-proton collisions at COSY-11, focusing on the final state interactions to refine the measurement of the K+K- scattering length.

Contribution

It provides a more precise estimate of the K+K- scattering length by analyzing both invariant mass distributions and excitation functions near threshold energies.

Findings

Refined K+K- scattering length measurement

Analysis of low-energy K+K- invariant mass distributions

Near threshold excitation function study

Abstract

In this article we present studies of the near threshold pp-->ppK+K- reaction in view of the K+K- final state interaction. The investigations include analysis of both the low-energy K+K- invariant mass distributions measured by COSY-11 collaboration at excess energies of Q = 10 MeV and Q = 28 MeV and the near threshold excitation function for the pp-->ppK+K- reaction. As a result of these studies we have estimated the K+K- scattering length more precise compared to the previous analysis based only on the analysis of the differential cross sections.