The critical density for kaon condensation in “nuclear star” matter is computed up to two-loop order in medium (corresponding to next-to-next-to-leading order in chiral perturbation theory in free space) with a heavy-baryon effective chiral Lagrangian whose parameters are determined from KN scattering and kaonic atom data. To the order considered, the kaon self-energy has highly non-linear dens...

This paper presents the analysis of leptonic and semileptonic kaon decays data done by the FlaviaNet Kaon Working group, as described in [1]. Data include all recent results by BNL-E865, KLOE, KTeV, ISTRA+, and NA48. Experimental results are critically reviewed and combined, taking into account theoretical (both analytical and numerical) constraints on the semileptonic kaon form factors. We rep...

High statistics data for the K → μνγ decay can allow the precision determination of the kaon structure dependent form factors. This study is possible at the proposed FNAL CKM experiment. CKM (Charged Kaons at the Main injector) is a decay-in-flight spectrometer with two Ring Imaging detectors(RICH), and designed to run at the main injector with a high kaon flux. The radiative decay data might b...

We study the kaon nuclear optical potential including the effect of the Θ + pentaquark in a selfconsistent approach, starting from an extension of the Jülich meson-exchange potential as bare kaon-nucleon interaction. Significant differences between a fully self-consistent calculation and the low-density T ρ approximation are observed. Whereas the influence of the KN → Θ + absorption process is ...

We investigate the influence of charged kaon condensation in hadronic sector on the formation of the electron-free charge neutral quark matter of equipartition of three light flavors, i.e., a phenomenon called " enforced electrical neutrality " of the color-flavor locked (CFL) phase. We employ the chiral quark model which is assumed to be applicable, " bottom-up, " toward chiral restoration whi...

The charged and neutral kaon form factors are calculated as a phenomenological application of the QCD Dyson-Schwinger equations. The results are compared with the pion form factor calculated in the same framework and yield FK±(Q 2) > Fπ±(Q 2) on Q2 ∈ [0, 3] GeV2; and a neutral kaon form factor that is similar in form and magnitude to the neutron charge form factor. These results are sensitive t...

We report on a study of the pentaquark Θ+(1540), using a variety of different interpolating fields. We use Chirally Improved fermions in combination with Jacobi smeared quark sources to improve the signal and get reliable results even for small quark masses. The results of our quenched calculations, which have been done on a 123×24 lattice with a lattice spacing of a = 0.148 fm, do not provide ...