Extracting the Pion Distribution Amplitude from Lattice QCD through Pseudo-Distributions
Proceedings of The 40th International Symposium on Lattice Field Theory — PoS(LATTICE2023)(2024)
摘要
The Light-Cone Distribution Amplitude (LCDA) encodes the non-perturbative
information of the leading Fock component of the hadron wave function,
therefore required for processes including exclusive hadron production. As the
pseudo-Nambu-Goldstone boson of QCD, the nonperturbative structure of the pion
is of particular interest. Progress on the Lattice QCD calculation of the pion
LCDA on O(a)-improved Wilson fermion ensembles at several lattice
spacings is presented. Excited-state systematics are taken into account within
a Bayesian Model Averaging framework. A Renormalization-Group-Invariant (RGI)
ratio of matrix elements is formed for further extraction of the pion LCDA.
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