Year: 2026
Type: preprint
Abstract: Within rainbow-ladder truncation, we identify three contributions to the pion's gravitational form factors---graviton coupling to the quark, to the gluon dressing the quark, and to the gluon binding the pion---and separate them into quark and gluon parts. Using an algebraic quark model with a dynamical basis, we obtain $A(0)=1$, $D(0)=-1$ in the chiral limit, and momentum fractions $\langle x\rangle_q=0.896$, $\langle x\rangle_g=0.104$. The D-term obeys the same partition at the model scale.
Source: arXiv (Cornell University)
Authors: Kang, Jiayin, Chang, Lei
Institution: Nankai University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Award: G7705497243
OpenAlex ID: W7220694076