Speaker
Chuang Huang
(Heidelberg University, ITP)
Description
We present the first functional QCD calculation of the pion distribution amplitude (DA) using the large-momentum effective theory in the functional renormalization group (fRG) framework. With only the strong coupling and current quark masses as input, we compute the quasi-DA from first-principles QCD correlation functions. By pushing the pion momentum up to $P_z = 4.5\ \mathrm{GeV}$, the quasi-DA becomes fully saturated, rendering the extrapolation uncertainty to the light-cone limit negligible. The resulting second moment $\langle \xi^2 \rangle_\pi = 0.267$ is significantly smaller than existing lattice-LaMET determinations and lies in a range consistent with other nonperturbative approaches.
| Affiliation | Institute for Theoretical Physics, University Heidelberg |
|---|---|
| Career status | Postdoc |
Authors
Chuang Huang
(Heidelberg University, ITP)
Jan M. Pawlowski
Lei Chang
(Nankai University)
Prof.
Wei-jie Fu
(Dalian University of Technology)
Dr
Yang-yang Tan
(University of Tokyo)