Four-quark and six-quark components in the pion light front wave function and nonperturbative sea in the pion - INSPIRE

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Four-quark and six-quark components in the pion light front wave function and nonperturbative sea in the pion

A. Szczurek
(
- Cracow, INP
)
,
H. Holtmann
(
- Julich, Forschungszentrum
)
,
J. Speth
(
- Julich, Forschungszentrum
)

1996

21 pages

Published in:

Nucl.Phys.A 605 (1996) 496-516

DOI:

10.1016/0375-9474(96)00175-3

View in:

Nuclear Science References

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Abstract: (Elsevier)

We discuss possible effects of “meson-meson” and “baryon-antibaryon” Fock components to the pseudoscalar meson light-front wave functions. We include pseudoscalar-vector, pseudoscalarscalar, vector-vector and vector-axial meson-meson components and octet-octet, octet-decuplet and decuplet-decuplet baryon-antibaryon components. We find that only a few principal Fock components play an important role in the expansion. We estimate the probability of the four-quark components to be 10–26% and the probability of the six-quark components to be less than 0.3%. The presence of such Fock components leads to an extra non-perturbative sea in the pion. As a consequence, the sea quark distributions are larger than from the models with two valence quarks at the initial Q 2 scale. In analogy to the nucleon case, we find a suppression of the strange sea in the pion with respect to the light ( u , d ) quarks. This suppression factor exhibits a Bjorken- x dependence.

pi: wave function
field theory: light front
quark: multiquark
quark: valence
quark: sea
Fock space
hadron hadron: coupling
coupling: hadron hadron
energy spectrum: parton
parton: energy spectrum

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