Pion, Kaon and nucleon gravitational form factors

Zhao-Qian Yao; Yin-Zhen Xu; Daniele Binosi; Minghui Ding; Zhu-Fang Cui; Khépani Raya; Craig D. Roberts; José Rodríguez-Quintero

arXiv · 2503.23166

Pion, Kaon and nucleon gravitational form factors

Zhao-Qian Yao·Yin-Zhen Xu·Daniele Binosi·Minghui Ding·Zhu-Fang Cui·Khépani Raya·Craig D. Roberts·José Rodríguez-Quintero

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Abstract

A unified set of predictions for pion, kaon and nucleon gravitational form factors is obtained using a symmetry-preserving truncation of each relevant quantum field equation. A crucial aspect of the study is the self-consistent characterization of the dressed quark-graviton vertices, applied when probing each quark flavor inside mesons or nucleons. The calculations reveal that each hadron's mass radius is smaller than its charge radius, matching available empirical inferences; moreover, core pressures are significantly greater than those in neutron stars. This set of predictions is expected to be instrumental as forthcoming experiments provide opportunities for validation.

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Zhao-Qian Yao, Yin-Zhen Xu, Daniele Binosi, Minghui Ding, Zhu-Fang Cui, Khépani Raya, Craig D. Roberts, José Rodríguez-Quintero. 2025-03-29. Pion, Kaon and nucleon gravitational form factors. https://arxiv.org/abs/2503.23166

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