Abstract
Pion valence distributions in nuclear medium and vacuum are studied in a light-front constituent quark model. The in-medium input for studying the pion properties is calculated by the quark-meson coupling model. We find that the in-medium pion valence distribution, as well as the in-medium pion valence wave function, are substantially modified at normal nuclear matter density, due to the reduction in the pion decay constant.
Highlights
There is a large uncertainty in the low x 10−3 behaviour of the gluon distribution in the global parton distribution function (PDF) analyses, at low scales [1, 2, 3]
The data measured at HERA sample the gluon distribution down to x ∼ 10−3 and data measured by the LHCb collaboration are sensitive to the gluon distribution down to x ∼ 10−5
The main reason for this is that the theoretical frameworks used to describe exclusive heavy vector meson (HVM) production differ to varying degrees from the standard framework used to describe more inclusive processes
Summary
There is a large uncertainty in the low x 10−3 behaviour of the gluon distribution in the global parton distribution function (PDF) analyses, at low scales [1, 2, 3]. The exclusive HVM data are not typically included in the global PDF fits. The main reason for this is that the theoretical frameworks used to describe exclusive HVM production differ to varying degrees from the standard framework used to describe more inclusive processes.
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