We briefly outline the so-called extended on-mass-shell renormalization scheme for manifestly Lorentz-invariant baryon chiral perturbation theory which provides a simple and consistent power counting for renor-malized diagrams. We comment on the role of chiral symmetry in the renormalization program and discuss as applications the mass and the electromagnetic form factors of the nucleon.

It is pointed out that K condensation in high density matter gives rise to an extremely light Goldstone boson whose mass comes entirely from weak interactions. This implies the existence of metastable non-topological domain walls with a long lifetime. We comment on the mass of the superfluid mode if baryon number is violated. Typeset using REVTEX email: [email protected]

We present recent CDF results on the properties of hadrons containing heavy quarks. These include the measurements of mass, lifetime and relative cross section of the B c meson and an updated measurement of the B 0 s and Λ 0 b lifetime. We also summarize new measurements of the mass of the Σ b baryon.

We estimate the mass and the width of pentaquark Θ∗ states in the {27} baryon multiplet from chiral soliton model. The calculations show that the mass of Θ∗ is about 1.60 GeV and the width for the process Θ∗ → KN is less than 44 MeV. We also discuss the search for the existence of Θ∗ states in physical processes.