Pion gravitational form factors in an algebraic rainbow-ladder model

Jiayin Kang; Lei Chang

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arXiv · 2610.04386

Pion gravitational form factors in an algebraic rainbow-ladder model

Jiayin Kang·Lei Chang

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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.

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Jiayin Kang, Lei Chang. 2026-10-03. Pion gravitational form factors in an algebraic rainbow-ladder model. https://arxiv.org/abs/2610.04386

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