Pseudoscalar mesons parton distribution amplitudes

¹ Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
² Institute for Theoretical Physics and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
³ Key Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Nanjing University, Nanjing 210093, China
⁴ Department of Physics, Nanjing University, Nanjing 210093, China

^a e-mail: chenchen.anl@gmail.com
^b e-mail: shichao0820@gmail.com

Published online: 25 March 2016

Abstract

We compute all kaon and pion parton distribution amplitudes (PDAs) to twist-three and find that all of the pion’s distributions are symmetric and all of the kaon’s distributions are skewed in favour of the heavier s-quark, which are clear signals of dynamical chiral symmetry breaking (DCSB). And we can also notice that only the pseudotensor PDA can reasonably be approximated by its conformal limit. At any realistic energy scale, the pseudovector and pseudoscalar PDAs differ markedly from the corresponding functions in QCD’s conformal limit. We can use these PDAs as the inputs to study hard exclusive processes and get trustable results.