Possible coexistence and/or competition of kaon condensation with hyperons are investigated in hyperonic matter, where hyperons are mixed in the ground state of neutron-star matter. The formulation is based on the effective chiral Lagrangian for the kaon-baryon interaction and the nonrelativistic baryon-baryon interaction model. First, the onset condition of the s-wave kaon condensation realize...

The equation of state and the properties of neutron stars are studied for a phase transition to a charged kaon condensate. We study the mixed phase by using Gibbs condition with comparison to the hitherto applied Maxwell construction. Implications for kaon condensation and for the mass-radius relation of condensed neutron stars are examined. The high density behavior of the equation of state of...

Kaon production in Ni + Ni heavy-ion collisions at 1.91A GeV was measured by the FOPI collaboration at the heavy-ion synchrotron (SIS) at GSI making use of the newly installed MMRPC barrel [1]. Sub-threshold kaon production is expected to provide valuable insight into the properties of hadrons at high density [2]. The kaon-nucleon potential is expected to enhance the in-medium effective mass fo...

The first measurement of kaon phase space densities are presented as a function of mT , √ snn and the number of participants. The kaon phase space density increases with the number of participants from ee to Pb+Pb collisions. However the ratio of the kaon and pion phase space densities at low PT is independent of number of participants for √ snn = 17GeV. This paper is dedicated to Francis Ricca...

We analyse the production and propagation of pions and kaons in heavy-ion reactions from 0.8 – 1.8 A·GeV within a coupled channel transport approach including the kaon production channels BB K. Assuming the hyperon selfenergy to be 2/3 of the nucleon selfenergy we find that all inclusive experimental K + spectra at SIS energies can be reproduced reasonably well without any selfenergies for the ...

In the past few years charged kaon experiments have indicated possible scalar and tensor couplings in semileptonic kaon decays(K ! e ). These couplings, if correct, are not predicted by the Standard Model and may indicate the onset of new physics. We present a summary of the existing data and a new, precision measurement of these couplings in the neutral kaon system based on a 3% subset of the ...

A concise overview of the interesting recent developments in kaon phyiscs discussed at KAON 2007 is presented. c Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

I review recent lattice results in kaon physics, particularly in the determination of Vus and the BK parameter of K0-K̄0 mixing. I use lattice data to argue for the need of developing SU(2)L×SU(2)R chiral perturbation theory for kaon physics and discuss some recent progress in achieving this. In particular it is shown that for K`3 decays at q2 = 0 (where q is the momentum transfer between the ka...

Kaon excitations (kaonic modes) are investigated in hyperonic matter, where hyperons (Λ, Σ, Ξ ) are mixed in the ground state of neutron-star matter. P -wave kaon-baryon interactions as well as the s-wave interactions are taken into account within chiral effective Lagrangian, and the nonrelativistic effective baryon-baryon interactions are incorporated. When the hyperon Λ is more abundant than ...