113 research outputs found
Bound states in a constituent quark model
We consider the existence of bound systems consisting of two quarks and two
antiquarks () within the framework of a constituent quark model.
The underlying quark dynamics is described by a linear confinement potential
and an effective interaction which has its origin in instanton
effects of QCD. We calculate the spectra and examine the internal structure of
the states found.Comment: 11 pages, needs epsf.st
Electromagnetic N- transition form factors in a covariant quark-diquark model
The electromagnetic N- transition form factors are calculated in the
framework of a formally covariant constituent diquark model. As a spin-3/2
particle the is assumed to be a bound state of a quark and an
axial-vector diquark. The wave function is obtained from a diquark-quark
Salpeter equation with an instantaneous quark exchange potential. The three
transition form factors are calculated for momentum transfers squared from the
pseudothreshold up to . The magnetic form
factor is in qualitative agreement with experiment. We find very interesting
results for the ratios E2/M1 and C2/M1.Comment: 16 pp, RevTeX, 7 figs, uses eps
The benefits of strength training on musculoskeletal system health: practical applications for interdisciplinary care
Global health organizations have provided recommendations regarding exercise for the general population. Strength training has been included in several position statements due to its multi-systemic benefits. In this narrative review, we examine the available literature, first explaining how specific mechanical loading is converted into positive cellular responses. Secondly, benefits related to specific musculoskeletal tissues are discussed, with practical applications and training programmes clearly outlined for both common musculoskeletal disorders and primary prevention strategies
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