W. T. Streader

The onset of color transparency in (e,ép) reactions on nuclei

“…At moderate energies, one has to calculate the nuclear transparency (24) using the diffraction operatorσ ef f . Simultaneously, one has to apply the rule (22) to the electromagnetic vertex as well:…”

“…There exists considerable evidence that the nucleon can be regarded as a quark core surrounded by a pionic cloud [22] which, in the simplest approximation, yields a wave function |N = cos(θ)|3q + sin(θ)|3q + π .…”

“…which gives a lower bound for σ tot ((3q)N). Evaluation of the number of pions in the nucleon with a realistic πN vertex function gives n π ∼ 0.4 [22]. The same admixture of pions describes diffraction production of the continuum Nπ system by the so-called Drell-Hiida-Deck mechanism (for a review see [21]).…”

“…Elastic (a) and inelastic (b) shadowing in pA scattering. The minimal eigenvalue σ min (ν) (ν = Q 2 /2m N ) of the diffraction matrix(22) for the 3q-core of the nucleon as a function of ν for different nuclei ( R 2 ch 3q = 0.8 R 2 ch p and ∆m = 0.7GeV /c 2 ).…”