β Scribed by Andreas Mair; Marco Traini
No coin nor oath required. For personal study only.
We propose a quark model description of the nucleon which includes, in a unified picture, valence quarks and a core of q~ pairs and gluons at the hadronic (non-perturbative) scale. The resulting parton distributions are evolved to high Q2 by means of an appropriate next-to-leading order evolution and compared with the data. The procedure is carried out for several, rather different, quark model pictures to analyze the model dependence. We conclude that there is not a smooth transition between the degrees of freedom of low-energy nuclear physics (baryons and mesons) and a description in terms of quarks and gluons.
π SIMILAR VOLUMES
It is assumed that nucleon consists of three quarks with no admixture of gluons or strange quarks. Gluons as are seen in deep inelastic scattering, appear only as a result of bremsstrahlung by valence quarks. The model gives unique predictions for observable quantaties and imitates the scaling behav