We have constructed the leading order strangeness S = −1,−2 baryon-baryon potential in a chiral effective field theory approach. The chiral potential consists of one-pseudoscalar-meson exchanges and non-derivative four-baryon contact terms. The potential, derived using SU(3) f symmetry constraints, contains six independent low-energy coefficients. We have solved a regularized Lippmann-Schwinger...

In this talk I summarize main features of the vector manifestation (VM) which was recently proposed as a novel manifestation of the Wigner realization of chiral symmetry in which the symmetry is restored at the critical point by the massless degenerate pion (and its flavor partners) and the ρ meson (and its flavor partners) as the chiral partner. I show how the VM is realized in hot and dense Q...

A personal selection is made of the highlights of the COSY–11 physics program undertaken at the COoler SYnchrotron of the Forschungszentrum Jülich. This has been particularly rich in the field of strange and non–strange meson production in proton–proton and proton–deuteron collisions. The results are considered in relation to experiments carried out at other facilities and with respect to their...

In lattice QCD, obtaining properties of heavy-light mesons has been easier said than done. Focusing on the B meson’s decay constant, it is argued that towards the end of 1997 the last obstacles were removed, at least in the quenched approximation. These developments, which resulted from a fuller understanding and implementation of ideas in effective field theory, bode well for current studies o...

We present the KEK B-factory project, which discovered CP violation in B-meson decays and proved that the Kobayashi-Maskawa theory correctly explains CP violation in meson decays.

The density dependent relativistic hadron field (DDRH) theory is applied to strongly asymmetric nuclear matter and finite nuclei far off stability. A new set of in-medium meson-nucleon vertices is derived from Dirac-Brueckner Hartree-Fock (DBHF) calculations in asymmetric matter, now accounting also for the density dependence of isovector coupling constants. The scalar-isovector δ meson is incl...

I discuss the theoretical status of the 'soft' pomeron and its place in describing generic diffractive processes. The role of perturbative QCD (pQCD) corrections is considered, in particular in the context of quasi-elastic vector meson production at high Q 2. In those processes where short distances are dominant, the 'hard' (pQCD) pomeron is expected to reveal itself, such a process may well be...

We review recent developments in the understanding of meson properties as solutions of the Bethe–Salpeter equation in rainbow-ladder truncation. Included are recent results for the pseudoscalar and vector meson masses and leptonic decay constants, ranging from pions up to c¯ c bound states; extrapolation to b ¯ b states is explored. We also present a new and improved calculation of Fπ(Q 2) and ...

A bstract We perform a complete study of the low-energy phenomenology S 1 and 3 leptoquarks, aimed at addressing observed deviations in B -meson decays muon magnetic dipole moment. Leptoquark contributions to observables are computed one-loop accuracy an effective field theory approach, using recently published matching these leptoquarks Standard Model theory. present several scenarios, discuss...