2014

Quasi-parton distribution functions: a study in the diquark spectator model

Gamberg, Leonard, Kang, Zhong-Bo, Vitev, Ivan et al.

Understand

A set of quasi-parton distribution functions (quasi-PDFs) have been recently proposed by Ji.

Defined as the matrix elements of equal-time spatial correlations, they can be computed on the lattice and should reduce to the standard PDFs when the proton momentum $P_z$ is very large.
Since taking the $P_z\to \infty$ limit is not feasible in lattice simulations, it is essential to provide guidance for what values of $P_z$ the quasi-PDFs are good approximations of standard PDFs.
Within the framework of the spectator diquark model, we evaluate both the up and down quarks' quasi-PDFs and standard PDFs for all leading-twist distributions (unpolarized distribution $f_1$, helicity distribution $g_1$, and transversity distribution $h_1$).

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