Empirical Determination of the Pion Mass Distribution
Y.-Z. Xu1,2 , K. Raya1 , Z.-F. Cui3,4 , C. D. Roberts3,4* , and J. Rodríguez-Quintero1
1 Dpto. Ciencias Integradas, Centro de Estudios Avanzados en Fis., Mat. y Comp., Fac. Ciencias Experimentales, Universidad de Huelva, Huelva 21071, Spain2 Dpto. Sistemas Físicos, Químicos y Naturales, Univ. Pablo de Olavide, E-41013 Sevilla, Spain3 School of Physics, Nanjing University, Nanjing 210093, China4 Institute for Nonperturbative Physics, Nanjing University, Nanjing 210093, China
Abstract ：Existing pion+nucleus Drell-Yan and electron+pion scattering data are used to develop ensembles of model-independent representations of the pion generalized parton distribution (GPD). Therewith, one arrives at a data-driven prediction for the pion mass distribution form factor, $\theta_2^\pi $. Compared with the pion elastic electromagnetic form factor, $\theta_2^\pi$ is harder: the ratio of the radii derived from these two form factors is $r_\pi^{\theta_2}/r_\pi = 0.79(3)$. Our data-driven predictions for the pion GPD, related form factors and distributions should serve as valuable constraints on theories of pion structure.
收稿日期: 2023-03-02
Express Letter
出版日期: 2023-03-24
:
12.38.Aw
(General properties of QCD (dynamics, confinement, etc.))
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2023, Vol. 40 
