A relativistic description of pion-nucleon scattering based on the four-dimensional Bethe-
Salpeter equation is presented. The kernel of the equation consists of s-and u-channel …

We developed a numerical method, based on the Padé summation, to solve the covariant
spectator equation without partial wave decomposition, and applied it to the NN system. We …

Various quasipotential two-body scattering equations are studied at the one-loop level for
the case of both t-and u-channel exchange potentials. We find that the quasipotential …

A modification of the one boson exchange (OBE) kernel for the covariant spectator theory
(CST) is presented and discussed. When applied to the scattering of two identical particles …

We compare the scattering amplitude resulting from the several quasipotential equations for
scalar particles. We consider the Blankenbecler-Sugar, spectator, Thompson, Erkelenz …

The contribution of the box and crossed two-pion-exchange diagrams to proton-proton
scattering at 90 cm○ is calculated in the laboratory momentum range up to 12 GeV/c …

We consider the covariant Spectator equation with a One Boson Exchange (OBE) kernel,
and apply it to the NN system. Relativistic effects such as retardation and negative-energy …

In our recent works we derived a chiral $ O (q^ 4) $ two-pion exchange nucleon-nucleon
potential (TPEP) formulated in a relativistic baryon (RB) framework, expressed in terms of …

We present calculations of the two-pion-exchange contribution to proton-proton scattering at
90 degrees using form factors appropriate for representing the distribution of the constituent …