Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-01-26
Eur.Phys.J.C10:239-247,1999
Physics
High Energy Physics
High Energy Physics - Phenomenology
Talk presented at INPC-99 Conference, Paris, August 24-28, 1998. 15 pages (LaTeX) including 6 figures which are generated from
Scientific paper
10.1007/s100520050585
Nucleon structure function ratios r(x) = F2A(x)/F2D(x) measured in the range of atomic masses A larger or equal 4 are analyzed with the aim to determine the pattern of the x and A dependence of F2(x) modifications caused by nuclear environment. It is found that the x and A dependence of the deviations of the r(x) from unity can be factorized in the entire range of x. The characteristic feature of the factorization is represented with the three cross-over points x_i, i = 1 -- 3 in which r(x) = 1 independently of A. In the range x lager than 0.7 the pattern of r(x) is fixed with x_3 = 0.84 +/- 0.01. The pattern of the x dependence is compared with theoretical calculations of Burov, Molochkov and Smirnov to demonstrate that evolution of the nucleon structure as a function of A occurs in two steps, first for A less or equal 4 and second for A larger than 4. The long-standing problem of the origin of the EMC effect is understood as the modification of the nucleon structure in the field responsible for the binding forces in a three-nucleon system.
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