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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The electromagnetic tensor for inclusive electron scattering off the pion W ~ for momentum
transfers such that q+ = 0, (q+ = q0 + q3) is shown to obey a sum-rule for the component
W +÷. From this sum-rule, one can define the quark-antiquark correlation function in the pion, which characterizes the transverse distance distribution between the quark and antiquark in the light-front pion wave-function. Within the realistic models of the relativistic pion wave function (including instanton vacuum inspired wave function) it is shown that the value of the two-quark correlation radius (rqo) is near twice the pion electromagnetic radius (r,~), where r~ ~ 2/3 fm. We also define the correlation length lco, where the two-particle correlation have an extremum. The estimation of leorr ~ 0.3--0.5 fm is very close to estimations from instanton models of QCD vacuum. It is also shown that the above correlation is very sensitive to the pion light-front wave-function models.