Color transparency effects in electron deuteron interactions at intermediateQ 2

Abstract

Abstract. High momentum transfer electrodisintegration of polarized and unpolarized deuterium targets, d(e, e'p)n is studied. We show that the importance of final state interactions FSI, occuring when a knocked out nucleon interacts with the other nucleon, depends strongly on the momentum ~, of the spectator nucleon. In particular, these FSI occur when the essential contributions to the scattering amplitude arise from internucleon distances 1.5 fm. But the absorption of the high momentum 7* may produce a point like configuration, which evolves with time. In this case, the final state interactions probe the point like configuration at the early stage of its evolution. If the point like configuration is still small after propagating about 1.5 fm, the FSI are suppressed. The result is that significant color transparency effects, which can either enhance or suppress computed cross sections, are predicted to occur for Q2>4GeV2. We suggest searching for color transparency phenomenon by examining ratios of experimentally measured quantities. Possible theoretical uncertainties of the calculations, including those due to the deuteron wave function and relativistic effects, are found to be small.

Hard breakup of the deuteron into twoΔisobars

“…In this case, the final state interaction is dominated by soft scattering of two ∆'s in the final state which will induce similar angular distributions for both ∆ ++ ∆ − and ∆ + ∆ 0 channels (see e.g., [48,49]). As a result, we expect essentially the same angular distribution for both ∆ ++ ∆ − and ∆ + ∆ 0 production channels.…”

Color coherent phenomena with hadron beams

“…(6) results in a significant difference between the predictions of the conventional Glauber approach and the present approach based on the Feynman diagram technique, see comparison in Ref. [27]. One finds that the 2 H(p, pn) reaction is very sensitive to the effects of color transparency and can provide a detailed mapping of the pattern of the expansion.…”

“…Hence a new theoretical approach for calculation of the high energy hard semi-exclusive reactions off the lightest nuclei has recently been developed [27,28]. In the nucleus lab.…”

Hard QCD Processes in the Nuclear Medium

“…It was developed early on by Gribov [100] and Bertocchi [101], and later expanded by other authors [85,86,95,102] as a generalization of an earlier non-relativistic model by…”

“…Firstly, it allows resolution of the deuteron target into two constituent nucleons [90,101], one of which is directly struck by the incident probe. Secondly, it allows interactions which occur after this initial probing of the struck nucleon-that is, final state interactions-to be described as cleanly-separated rescatterings that occur in sequence, each between two of the particles that appear in the final state [85,86,95,102].…”