We discuss the spin properties of top quark pairs produced at hadron colliders at next-to-leading order in the coupling constant αs of the strong interaction. Specifically we present, for some decay channels, results for differential angular distributions that are sensitive to tt̄ spin correlations. PACS number(s): 12.38.Bx, 13.88.+e, 14.65.Ha

The PANDA experiment at the facility for anti-proton and ion research (FAIR) will study the strong interaction by precision spectroscopy. A detector system with excellent particle identification (PID) is therefore required. Charged hadron identification in the barrel region will be performed by a compact ring imaging Cherenkov detector based on the DIRC (Detection of Internally Reflected Cheren...

It is shown that the gauge boson mass is naturally generated–without Higgs–in the pion beta decay using the scalar strong interaction hadron theory. This mass generation is made possible by the presence of relative time between quarks in the pion in a fully Lorentz covariant formalism.

Hyperon non-leptonic weak decay amplitudes are studied in the chiral perturbation theory. The weak interaction vertices caused by the four quark operators are substituted by the products of the hadronic currents and by the phenomenologically introduced weak Hamiltonian of hadron operators. Our study suggests the improvement of the theoretical prediction for the weak decay amplitudes.

Hadronic interactions are successfully parameterized in different models. Those most frequently applied are the Regge parameterization and the geometrical model. In the present paper we want to apply the geometrical picture to different domains of the hadronic interaction. The model used is a very economical model in that it contains only few parameters most of which have a direct physical inte...

Slow nucleons emitted during a hadron-nucleus interaction can give information on the centrality, impact parameter of the collision. The aim of this note is to provide the reader with the important characteristics of the slow nucleons, focusing on their spectra, correlations. This study tries to build on evidences, hence more weight is put on experimental results than on models.

The earlier suggested and developed idea of quark-hadron duality, underlying ”bremsstrahlung-weighted” sum rules for total or polarized photon interaction cross sections, is applied to the description of excitation of light scalar mesons in gamma-gamma interactions. The emphasis is put on the discussion of a role of the scalar diquark cluster degrees of freedom in the radiative formation of lig...