In this approach, the authors used a
valence quark model in combination with SU(6) symmetry relations and data on hyperon decays to produce a range of predictions for effective PV meson-nucleon couplings consistent with the SM.
Two free indices which exist in definition of the Bernstein polynomials can be determined so as to give us the averaged amount for the
valence quark densities near the available experimental data over the concerned interval of the x-Bjorken variable.
Valence quarks certainly cannot do this, because in the case of a high energy ep scattering, an electron collides with a valence quark.
A proton has three valence quarks and a core that carries three monopole units of the opposite sign.
This is natural due to the fact that baryon consists of
valence quarks. If we regard [[mu].sub.baryon] = [SIGMA][[mu].sub.q], where [SIGMA] denotes the sum over all
valence quarks in baryon, the present work is consistent with the models which study [[mu].sub.baryon] [1,29-32,36].
According to the quark model [1], the properties of hadrons are primarily determined by their so-called
valence quarks. For example, a proton is composed of two up quarks and one down quark.
In addition to those so-called valence quarks, each nucleon contains multitudes of gluons--particles that bind quarks --and of short-lived quark-antiquark pairs, known collectively as the quark sea.
From previous experiments, scientists knew that only valence quarks can grab major portions of a nucleons total energy content, says Jian-Ping Chen of the Jefferson lab, a coleader of the experiment.
Since the [[DELTA].sup.++](1232) baryon has 3
valence quarks of the u flavor, the isospin I = 3/2 of all four [DELTA] baryons is fully symmetric.
Moreover, in addition to the "up" and "down"
valence quarks, "strange" quark and antiquark pairs seem to play an important role within the proton.
The three
valence quarks of baryons make an important contribution to the quantities described in Table 1.
The partons are composed of the three quarks (referred to as the
valence quarks), but also includes the quark-antiquark pairs emerging from vacuum point energy, explicable by the uncertainty principle as well as involving gluons which are quanta of the strong force of quark interactions.