Quark-antiquark correlation in the pion
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Data
1997-09-22
Autores
De Melo, J. P B C
Frederico, T.
Tomio, Lauro [UNESP]
Dorokhov, A. E. [UNESP]
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Resumo
The electromagnetic tensor for inclusive electron scattering off the pion Wμν 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 (rqq̄) is near twice the pion electromagnetic radius (rπ), where rπ ≈ 2/3 fm. We also define the correlation length lcorr where the two-particle correlation have an extremum. The estimation of lcorr ≈ 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. © 1997 Elsevier Science B.V.
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Palavras-chave
Electromagnetic form factors, Pion, Relativistic quark model, Sum rules
Como citar
Nuclear Physics A, v. 623, n. 3-4, p. 456-470, 1997.