Combining the Nambu-Jona-Lasinio and quark-meson coupling models predicts that nuclear matter barely changes pion valence quark distributions while kaon valence u and anti-s distributions shift in opposite x-regions at higher density.
Kaon Structure in the confining Nambu-Jona-Lasino Model
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abstract
The elastic electromagnetic form factors in the space-like region and valence quark distribution functions for the K+ meson are calculated using the confining Nambu-Jona-Lasinio model with the help of the proper-time regularization scheme, which simulates quark confinement. In this model framework, the dynamics information on the nonperturbative aspects is obtained from quark propagators and bound state amplitudes via Bethe-Salpeter equations. We found that the results on the kaon form factors and valence quark distribution functions are qualitatively in excellent agreement with the existing kaon data as well as the perturbation QCD prediction at higher $Q^2$.
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2019 1verdicts
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Valence-quark distributions of pions and kaons in a nuclear medium
Combining the Nambu-Jona-Lasinio and quark-meson coupling models predicts that nuclear matter barely changes pion valence quark distributions while kaon valence u and anti-s distributions shift in opposite x-regions at higher density.