The last three years have been marked by very rapid progress in experimental studies of kaon decays. This review is an attempt to summarize those results that offer direct comparison for the predictions of chiral perturbation theory (ChPT), including in particular the determination of the I = 0, 2 ππ scattering lengths from K → 3π and Ke4 data, recent results on a selection of rare and radiativ...

We critically discuss the theoretical developments that led to predictions of very deeply bound kaon states and then revise the data of the KEK experiment from where claims for evidence of deeply bound kaon atoms in nuclei were made. We conclude that the peaks seen in the experiment correspond to the absorption of kaons by a pair of nucleons leading to Σp and Λp and leaving the daughter nucleus...

We make a thorough study of the process of three body kaon absorption in nuclei, in connection with a recent FINUDA experiment which claims the existence of a deeply bound kaonic state from the observation of a peak in the Λd invariant mass distribution following K− absorption on Li. We show that the peak is naturally explained in terms of K− absorption from three nucleons leaving the rest as s...

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 12 × 24 lattice with a lattice spacing of a = 0.148 fm, do not provide ...

We investigate the composition and the equation of state of the kaon condensed phase in neutrinofree and neutrino-trapped star matter within the framework of the Brueckner-Hartree-Fock approach with three-body forces. We find that neutrino trapping shifts the onset density of kaon condensation to a larger baryon density, and reduces considerably the kaon abundance. As a consequence, when kaons ...

The chiral SU(3) quark model is extended to include an anti-quark in order to study the kaon-nucleon system. The model input parameters bu, mu, ms are taken to be the same as in our previous work which focused on the nucleonnucleon and nucleon-hyperon interactions. The mass of the scalar meson σ is chosen to be 675 MeV and the mixing of σ0 and σ8 is considered. Using this model the kaon-nucleon...

A brief survey of applications of chiral perturbation theory to both semileptonic and nonleptonic kaon decays is presented. Special emphasis is given to recent theoretical advances related to semileptonic decays, in particular pion pion scattering and Ke4 decays. The systematic approach for including isospin violation and electromagnetic corrections in semileptonic kaon decays is discussed for ...

We consider QCD at a nonzero chemical potential for strangeness. At a critical value of the chemical potential equal to the kaon mass, kaon condensation occurs through a continuous phase transition. We show that in the limit of exact isospin symmetry a Goldstone boson with the dispersion relation E ∼ p appears in the kaon condensed phase. At the same time, the number of the Goldstone bosons is ...

The $\textit{BABAR}$ Collaboration data of the $D^0 \to K^0_S K^+ K^-$ process are analyzed within a quasi two-body factorization framework. In earlier studies, assuming $D^0$ transitions to two kaons and between one kaon proceed through dominant intermediate resonances, we approximated them as being proportional form factors. To obtain good fits, has multiply scalar-kaon factors, derived from ...

Borrowing the structures of hydrogen atom, molecular ion, and diatomic molecule, we predict nature a new type hydrogenlike charm-pion or charm-kaon matter that could be obtained by replacing proton electron in with charmed meson pion kaon, respectively. We find spectra molecule can simultaneously Coulomb potential for hydrogen, charm-pion, systems. The predicted also allows us to explore mass s...